New Circuits Page 173
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Here s an amplifier circuit that based on the BUZ11 can be replaced by an IRFZ34N and an ECC83 can be used instead of the ECC88. In that case the anode voltage should be reduced slightly to 155 V. The ECC83 (or its US equivalent the 12AX7) requires 2 ....
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The second 555 timer was configured as a monostable circuit, commonly referred to as a one shot since an output pulse only occurs if there is a trigger on the input. When this timer is triggered, the potentiometer in the RC timing network allows the output....
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Here is a very simple project of a door bell circuit. The heart of the circuit is UM66 melody IC which is a great and very famous melody IC, comes in TO-92 transistor package. The IC has only three pins and it is a complete melody system requires no external....
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Considering a simple circuit like the one below. Let us say that the voltage source suddenly turns on (from 0V to 1V), then current will through through the resistor R1, correct But assuming an ideal op-amp (drawing no current) and an ideal voltmeter....
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This circuit can detect only electrical wires connected to the mains (live wire). It has an LED for visual signalization and a buzzer for audio. As the electrician places the detector closer to the electrical wire the LED will flash at a higher frequency. As....
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The circuit is designed as a constant voltage source with a negative temperature coefficient. The transistor Q1 (BD 140) is used as the temperature sensor. The transistor Q2 is used to prevent the battery from discharging through R1 when the mains power is....
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One of the simplest sinewave oscillators is the Wien Bridge Oscillator. Any circuit requires 2 conditions to oscillate. Tracing the path from the input, round the feedback network, back to the input there must be an overall phase shift of 0 degrees at one....
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This is a very simple RF transmitter circuit that consists of the Holtek HT-12E encoder chip and AM 418MHZ-transmitter module ( WZ-X01 ). Using the hybrid RF xmit/receive modules make building the RF remote control a lot easy. The transmitter can be powered....
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This is a simple ultrasonic mosquito repeller circuit diagram. The circuit is design on the theory that pests like mosquito can be repelled by ultrasonic frequency around (20KHz-25KHz). This ultrasonic mosquito repeller circuit is based on a single CMOS IC....
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The schematic we are about to show you is the exterior lamp circuit diagram of the 1998 Chevrolet Blazer. The wiring diagram is quite clear to read, make sure to read this Chevrolet Blazer circuit diagram first before making any changes on your vehicle`s....
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This is circuit for accurate time-base generation using the readily available 3. 5795MHz crystal commonly used in telecommunication equipment. Crystal-based oscillator with divider IC chain or a similar circuit in the form of an ASIC is used for time-base....
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Floating the grid above ground is bad for RF, and bad for arc protection. The control grid ground is also the single most critical connection for stability. The grid connection to ground should always be as wide and short as possible, and use as many pins as....
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An H bridge is a kind of circuit you use to control the direction (and sometimes speed) of an electric motor, using only a single polarity voltage (you need to reverse the way current flows in order to reverse the way the motor rolls). You have 4....
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This easy to construct Handy pen torch electronic circuit and low component count, uses two power white LEDs for lighting. Low volt (4. 8V dc) supply available from the built in rechargeable Ni-Cd battery pack is first converted into two channel....
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Batteries are one of the energy sources available onboard vessels which are used in case of blackout and emergency situations on board a ship. These batteries are used for low voltage dc system like bridge navigational instruments and thus need to be kept....
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The sine wave generator composed of inverter is shown as the chart. The circuit could get high stable sine wave in more than a few MHz. In the figure, A1 and the crystal oscillator form a oscillating circuit, the output of A1 becomes sine wave signal after....
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Measuring distances using a modulated laser. The circuit I created (see above) is very simple and does not need many explanations. The first part consists of a fixed voltage regulator 7805 to derive a stable +5 V source. This is followed by a LM317....
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Basic Oscillator (Tone Generator) At 1.8 KHz, IC 555 , Here we have an astable oscillator built around 555, which gives an alarm tone of 1.8 KHz directly driving a speaker. This is basic alarm circuit, whic....
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1.5 Volt Tracking Transmitter, Simple circuits , The current draw for this tracker is 3.7mA, so the 1.5V button cell will last awhile. What the heck am I suppose to hear you ask? When your circuit is....
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This be simple Preamp circuit. It can take sound general signal AUX and a signal from Microphone. For enlarge sound signal at the beginning. By use op-amp IC....
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Human approach detector circuit is composed of integrated operational amplifier, gate circuit and resistor-capacitor unit in the diagram. Among them, 1MHz oscillator consists of reverser T1, 1MHz crystal oscillator and resistor-capacitor unit. The oscillator....
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The inverter is suitable for battery powering of mains appliances. It is a switching converter, which contains no bulky, heavy and expensive iron transformer. The advantage of small size and weight, precise output voltage stabilization and among other....
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The AQV20 series should be fine to drive an A. C. relay coil if the de-energizing back EMF from the relay coil does not exceed 600 v rating. It is diode in series with a conducting MOSFET. Might want to add two back to back zener surge suppressors across....
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This oscillator is called the Colpitts oscillator and voltage controlled to achieve the FM (frequency modulation) and PLL control. T1 must be HF transistors to work well, but in this case I use a cheap and common BC817 transistor. LC tank oscillator needs to....
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Copyright of this circuit belongs to smart kit electronics. In this page we will use this circuit to discuss for improvements and we will introduce some changes based on original schematic. This is an easy to build, but nevertheless very accurate and useful....
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The shown LEDs in the circuit sequentially light and "dance" as per the level of the music applied at the input, preferable directly from the speaker terminals of the audio gadgetwhosemusic level is to be monitored. The above stage is identical to all the....
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Whenever there is a need for battery-powered lighting, like for camping, solar powered cottages, cars, boats, planes, or emergency purposes, fluorescent lamps have a great appeal. Firstly, they are very much more efficient than glow lamps, so they produce....
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The cause may be dry solder joints, defective LEDs etc. , but also a flat battery (perhaps due to stuck key). The human eye is unable to perceive infra-red light. By contrast, an ordinary photo transistor like the BP103 has no problems working in the....
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Above is the schematic of one oscillator circuit. In technical terms the oscillator is a Schmitt trigger relaxation oscillator. Above you`ll also find....
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One-IC two-tones Siren. Double-tone Police sound. Single-tone old ambulance sound. Circuit diagram: Parts: R1,R3 470K 1/4W Resistors R2 680K 1/4W...
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This metal detector circuit needs to be powered using a 9 volts power supply ( DC) or a 9 volts battery. The C1 capacitor is a variable capacitor with a value of 365 pF, C2 is a 100pF silver mica capacitor, C3 is a 0.05 uF disc capacitor and the C4 is a 4.7....
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An audio amplifier is an electronic amplifier that amplifies low-power audio signals (signals composed primarily of frequencies between 20 - 20 000 Hz, the human range of hearing) to a level suitable for driving loudspeakers and is the final stage in a....
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A simple PLL FM demodulator circuit using IC XR2212 is shown here. XR2212 is a highly stable, monolithic PLL (phase locked loop) IC specifically designed for communication and control system applications. The IC has 0. 01 Hz to 300KHz frequency range, 4. 5....
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The circuit diagram of an Automatic Street Light Controller Circuit is explained in this post....
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A very simple and high quality TV transmitter circuit based on IC MC374 is shown in this article. MC1374 is an integrated TV modulator circuit that can be used in various TV transmitter applications. The MC1374 includes all necessary circuitries required for....
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Low-Pass and High-Pass audio output signal filters. Additional Sound Source Low Pass filter and experimental original design puls-gate signal filter ("processor"), both of which have independent or linked together Voltage Control input option. The....
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This is a project that I always wanted to do, but managed to put off for a long time. It has been over a year in the doing. Partly because there are so many good phono preamps in existence and I was slightly concerned that it was beyond my design skills. It....
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An AC coupled unity gain gain voltage follower operating on a single supply is shown here. The voltage divider network of R1 and R2 provides a DC voltage equal to half the supply voltage to the non-inverting input of the 741. The output DC voltage therefore....
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I finally got all of the materials I needed in to work on my arduino powered Diversity controller. The plan is to support 2 inputs (though the hardware can support up to 4 inputs), and 4 amplified outputs. The diversity will use RSSI to compare feeds and I....
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This program includes circuit design cad, simulation, and auto routing PC layout. I also use PSPICE at Unisys which has more capabilities but costs 6 times as much and needs to be renewed yearly. With these requirements in mind, and some others, I decided on....
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A Solar Engine is a circuit that takes in and stores electrical energy from solar cells, and when a predetermined amount has accumulated, it switches....
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The NCP5810D is a dual ’output DC/DC converter which CAN generate both a positive and a negative voltage. The device is optimized for powering modules such as AMOLED Display drivers where very good output voltage accuracy and regulation, signal integrity and....
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If you ever wanted to integrate RFID functionality into your project, this small tutorial might help you accomplish that. I used the RDM630 module from seeedstudio in its UART version. It comes on a small board with presoldered connectors which fits....
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Using two of the most basic oscillators you can DIY, this particular circuit works great to modulate our main LFSR circuit. It also sounds pretty cool on its own. The main noise generator for our circuit. The basic circuit at play here is a Linear Feedback....
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I`m looking for a circuit (the simpler and cheaper, the better) that can drive three or more LEDs at 200-350mA each, randomly flashing/strobing them at 5-20Hz. Input power should be low-voltage DC. A range for Vin, instead of an exact 5.0V or whatever, would....
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This circuit uses a dual operational amplifier (TL082) to form a voltage-controlled oscillator (VCO). With the component values shown, the output-frequency range is 100 Hz to 10 kHz when the input control voltage is between 0. 05 and 10 V. ..
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TDA8444is the D / A ( digital / analog ) converter IC produced by Philips, and it is used to convert digital signals to analog signals. 1. pin functions and dataTDA8444 IC uses 16-pin double-row package, andpin functions and data are shown in Table 1. 2.....
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an easy to build, but nevertheless very accurate and useful digital voltmeter. It has been designed as a panel meter and can be used in DC power supplies or anywhere else it is necessary to have an accurate indication of the voltage present. The circuit....
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Using Integrated Switching Regulators When it came to power supply design, most Engineers would scratch their head thinking, œWhere do I start? Decision must be decided concerning....
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Each bistable circuit has two opposite-symmetry germanium transistors, two diodes, and four resistors. Additional transistor Q transfers conducting stage to next position when actuated by transfer pulse. Absence of capacitors gives high-speed operation. No....
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Using an ATmega 2560 and therefore the heart of Arduino, we have developed a universal remote control with GSM. This allows to control 2IN/2OUT, DTMF key, gate control and GSM thermostat activated remotely. The remote control is easier, thanks to the....
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This is a Low-dropout (LDO) Regulator circuit, constructed by using only a single PNP transistor. This circuit is directly related to load current. At very low....
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Atmel`s ATtiny1634 8-Bit AVR ® Microcontroller is based on the AVR ® enhanced RISC architecture. By executing powerful instructions in a single clock cycle, the ATtiny1634 achieves throughputs approaching 1 MIPS per MHz allowing the system designer to....
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Software-defined radios (SDRs) are used in all areas of communications including ham radio and SWL..
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The circuit illustrated produces a short duration of rapidly-sequencing tones, invoking the stereotypical sonic imagery of a sophisticated computer, such as would be scripted for the science-fiction genre. I designed this circuit for use in the composition....
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A very simple device allowing a quick check of common Infra-red Remote-Controls can be useful to the electronics amateur, frequently asked to repair or test these ubiquitous devices. A reliable circuit was designed with a handful of components: the LED will....
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There are chips that have AND/OR/NOT gates, but I was wondering if there`s a single one that have all of the ones I need - if not, then what should I use specifically Any reason it has to be those particular gates For example a package with with four NOR....
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Before three weeks i am introduced inverter circuit diagram but the circuit not included ac to inverter switching part so today i introducing a 230 Volt Ac to inverer switching circuit diagram. Circuit showing a inverter switching. Here i have used bc 558,....
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This be delay timer circuit model to be simple. It be the character delays to close electric all appliances. By fix the time about 5 minute. It can fine....
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This circuit is IC controlled emergency light. This series of automatic switching-on of the sunshine on mains failure and battery charger with overcharge protection. When mains is absent, the relay RL2 is in deenergised state, feeding battery offer to the....
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Here s a cheaper and easier method of making a telephone headset adapter. All that s required is a cheap headset ($5 at Harvey Norman), a DPDT switch and....
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Voltage Converter Circuit diagram for 3 volts to 5 volts (3v to 5v) using IC (CMOS Monolithic) MAX660 and MAX667-a positive voltage regulator..
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Metal enclosure, forget the plastic case they sell, it`s nearly useless. ( I made a box from copper PCB that I soldered together, it works okay, but could be better. ) Ground it to the enclosure well, and connect everything to a good earth ground. 4. Make....
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Design and Dimensioning of Aktive Low-Pass and High-Pass Filters. Sallen-Key and Multiple Feedback Topologies, Spice Netlist Generator....
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Capacitor instrument is not to be used to measure the capacity of the capacitor but for identifing good or bad and short circuit or open circuit, then it provides a reliable quality assurance for the production of circuit to reduce the circuit making....
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The enable signal for USB chip and GLCD controller were made by PLD decoder from the address lines. As we have seen the memory map for i/o of 8051SBC board, the available space is from 0x0300-0x07FF. The address range of 0x0300-0x03FF was used for USB chip....
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A rear fog lamp has been mandatory for trailers and caravans in order to improve visibility under foggy conditions. When this fog lamp is switched on, the fog lamp of the pulling vehicle must be switched off to avoid irritating reflections. For this purpose,....
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Here is a series of Touch Switch using only 3 transistors, this touch-based transistor switches can activate a load simply by the user touching a metal plate. It is designed to directly switch a relay to allow it to be used with large loads. As it uses only....
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Combining of video signals with pulses is accompanied by inversion of input signal. Value of R4 is 270 ohms for 5670 and 470 ohms for 6021. R2 is 680 ohms for 5670 and 1 K for 6021. Input signals must be positive. -NBS, "Handbook Preferred Circuits Navy....
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With a 9 V DC battery, it worked fine. But because of a less DC power, solenoid was not generating a powerful enough force. I modified a computer power supply as the power source. Now when providing +12 V (15. 0 A) power from it, the solenoid valve is pulled....
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This PIC software combines frequency counter and frequency lock functions. By adding couple of transistors and operation amplifier TL082, it is possible to lock the LC oscillator frequency. Frequency reference is formed from the measured frequency itself....
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This Atmel IC, is clocked in the circuit with a 12 MHz quartz and provides a communication between the Infrared receiver and the PC, so that this signal can being processed by infrared receiver programs like Girder. As soon as a valid RC5 signal of the....
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This is a basic dark detector/sensor circuit diagram based on a Photo Resistor (LDR) and few numbers of parts....
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Strictly speaking, this simple circuit shouldn`t work! How could anyone expect an ordinary light dependent resistor photo cell to `see` through a fingertip in natural daylight and detect the change in blood flow as the heart pulsates The secret is a high....
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Another frequency-determining device is the CRYSTAL. The crystal may be used with a tank circuit, or it may perform alone. Crystals exhibit a characteristic known as the PIEZOELECTRIC EFFECT. The piezoelectric effect is the property of a crystal by which....
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I have assembled the metronome circuit several times and it did not work. Two 555 manufacturers websites (ON Semiconductor and National Semiconductor) propose circuits that differ from yours in that pins 2/6/7 are not joined together but there is a resistor....
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This 5 volt regulated power supply circuit project is designed using the NCP3155 DC DC switching regulator with fully integrated power switches and full fault protection. This 5 volt regulated power supply circuit project require few external electronic....
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Using the LMD18200 3A H-Bridge designed by National Semiconductors for motion control applications can be designed a very simple motor controller electronic project. Ideal for driving DC and stepper motors; the LMD18200 accommodates peak output currents up....
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FM Stereo decoder using TDA7388A very simple with a compact design FM stereo decoder schematic circuit can be designed using the TDA7388 IC manufactured by ST Microelectronics. The TDA7338 is a monolithic integrated stereo decoder with noise blanking for FM....
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Here is the circuit diagram for simple door bell, you can assemble this circuit inside your room or home where as keep the switch outside your home or room that is easily noticable by the visitors. The working of this circuit is almost similar to my previous....
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This regulated power supply can be adjusted between a few volts and 15V with P1 and with P2 adjust the upper limit ( 15. 0V ). R6 value is 0. 7V / Imax where Imax is the maximum current. At Imax = 5A, R6 is 0. 14 © T1 and T2 must have heatsinks because power....
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The XC61H series is a highly accurate, low power consumption CMOS voltage detector with a delay circuit. Detect voltage is accurate with minimal temperature drift. Output configurations are available in both CMOS and N-channel open drain. Since the full....
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the sound system, the massive de-sensitized, and they defeated a maximum range. This can be increased if desired, you can have two tone controls, the lifting of 10 dB and a cut and the other with a little help and very subtle 3dB cut - it is quite....
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This is the circuit diagram of DC voltage doubler / DC converter. The circuit will convert 12VDC power supply to become a 24VDC at and 18VDC. Almost any PNP or NPN power transistors should be work for this circuit...
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Figure A is the schematic of the microstrip single stage RF amplifier. The amplifier is based on the M/A-Com LF2810A MOSFET. The transistor is actually a 10 watt, 28 volt part, but provides adequate gain for this application at 12 VDC. The amplifier provides....
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Often you find yourself in the position of needing to wind your own coil for a project, or maybe you come across an unmarked coil in the junk-box. How can you bestnd out its inductance An oscilloscope is all you need. Construct a resonant circuit using the....
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The circuit is based on the theory that insects like mosquito can be repelled by using sound frequencies in the ultrasonic (above 20KHz) range. The circuit is nothing but a PLL IC CMOS 4047 wired as an oscillator working at 22KHz. A complementary symmetry....
Here s an amplifier circuit that based on the BUZ11 can be replaced by an IRFZ34N and an ECC83 can be used instead of the ECC88. In that case the anode voltage should be reduced slightly to 155 V. The ECC83 (or its US equivalent the 12AX7) requires 2 ....
The second 555 timer was configured as a monostable circuit, commonly referred to as a one shot since an output pulse only occurs if there is a trigger on the input. When this timer is triggered, the potentiometer in the RC timing network allows the output....
Here is a very simple project of a door bell circuit. The heart of the circuit is UM66 melody IC which is a great and very famous melody IC, comes in TO-92 transistor package. The IC has only three pins and it is a complete melody system requires no external....
Considering a simple circuit like the one below. Let us say that the voltage source suddenly turns on (from 0V to 1V), then current will through through the resistor R1, correct But assuming an ideal op-amp (drawing no current) and an ideal voltmeter....
This circuit can detect only electrical wires connected to the mains (live wire). It has an LED for visual signalization and a buzzer for audio. As the electrician places the detector closer to the electrical wire the LED will flash at a higher frequency. As....
The circuit is designed as a constant voltage source with a negative temperature coefficient. The transistor Q1 (BD 140) is used as the temperature sensor. The transistor Q2 is used to prevent the battery from discharging through R1 when the mains power is....
One of the simplest sinewave oscillators is the Wien Bridge Oscillator. Any circuit requires 2 conditions to oscillate. Tracing the path from the input, round the feedback network, back to the input there must be an overall phase shift of 0 degrees at one....
This is a very simple RF transmitter circuit that consists of the Holtek HT-12E encoder chip and AM 418MHZ-transmitter module ( WZ-X01 ). Using the hybrid RF xmit/receive modules make building the RF remote control a lot easy. The transmitter can be powered....
This is a simple ultrasonic mosquito repeller circuit diagram. The circuit is design on the theory that pests like mosquito can be repelled by ultrasonic frequency around (20KHz-25KHz). This ultrasonic mosquito repeller circuit is based on a single CMOS IC....
The schematic we are about to show you is the exterior lamp circuit diagram of the 1998 Chevrolet Blazer. The wiring diagram is quite clear to read, make sure to read this Chevrolet Blazer circuit diagram first before making any changes on your vehicle`s....
This is circuit for accurate time-base generation using the readily available 3. 5795MHz crystal commonly used in telecommunication equipment. Crystal-based oscillator with divider IC chain or a similar circuit in the form of an ASIC is used for time-base....
Floating the grid above ground is bad for RF, and bad for arc protection. The control grid ground is also the single most critical connection for stability. The grid connection to ground should always be as wide and short as possible, and use as many pins as....
An H bridge is a kind of circuit you use to control the direction (and sometimes speed) of an electric motor, using only a single polarity voltage (you need to reverse the way current flows in order to reverse the way the motor rolls). You have 4....
This easy to construct Handy pen torch electronic circuit and low component count, uses two power white LEDs for lighting. Low volt (4. 8V dc) supply available from the built in rechargeable Ni-Cd battery pack is first converted into two channel....
Batteries are one of the energy sources available onboard vessels which are used in case of blackout and emergency situations on board a ship. These batteries are used for low voltage dc system like bridge navigational instruments and thus need to be kept....
The sine wave generator composed of inverter is shown as the chart. The circuit could get high stable sine wave in more than a few MHz. In the figure, A1 and the crystal oscillator form a oscillating circuit, the output of A1 becomes sine wave signal after....
Measuring distances using a modulated laser. The circuit I created (see above) is very simple and does not need many explanations. The first part consists of a fixed voltage regulator 7805 to derive a stable +5 V source. This is followed by a LM317....
Basic Oscillator (Tone Generator) At 1.8 KHz, IC 555 , Here we have an astable oscillator built around 555, which gives an alarm tone of 1.8 KHz directly driving a speaker. This is basic alarm circuit, whic....
1.5 Volt Tracking Transmitter, Simple circuits , The current draw for this tracker is 3.7mA, so the 1.5V button cell will last awhile. What the heck am I suppose to hear you ask? When your circuit is....
This be simple Preamp circuit. It can take sound general signal AUX and a signal from Microphone. For enlarge sound signal at the beginning. By use op-amp IC....
Human approach detector circuit is composed of integrated operational amplifier, gate circuit and resistor-capacitor unit in the diagram. Among them, 1MHz oscillator consists of reverser T1, 1MHz crystal oscillator and resistor-capacitor unit. The oscillator....
The inverter is suitable for battery powering of mains appliances. It is a switching converter, which contains no bulky, heavy and expensive iron transformer. The advantage of small size and weight, precise output voltage stabilization and among other....
The AQV20 series should be fine to drive an A. C. relay coil if the de-energizing back EMF from the relay coil does not exceed 600 v rating. It is diode in series with a conducting MOSFET. Might want to add two back to back zener surge suppressors across....
This oscillator is called the Colpitts oscillator and voltage controlled to achieve the FM (frequency modulation) and PLL control. T1 must be HF transistors to work well, but in this case I use a cheap and common BC817 transistor. LC tank oscillator needs to....
Copyright of this circuit belongs to smart kit electronics. In this page we will use this circuit to discuss for improvements and we will introduce some changes based on original schematic. This is an easy to build, but nevertheless very accurate and useful....
The shown LEDs in the circuit sequentially light and "dance" as per the level of the music applied at the input, preferable directly from the speaker terminals of the audio gadgetwhosemusic level is to be monitored. The above stage is identical to all the....
Whenever there is a need for battery-powered lighting, like for camping, solar powered cottages, cars, boats, planes, or emergency purposes, fluorescent lamps have a great appeal. Firstly, they are very much more efficient than glow lamps, so they produce....
The cause may be dry solder joints, defective LEDs etc. , but also a flat battery (perhaps due to stuck key). The human eye is unable to perceive infra-red light. By contrast, an ordinary photo transistor like the BP103 has no problems working in the....
Above is the schematic of one oscillator circuit. In technical terms the oscillator is a Schmitt trigger relaxation oscillator. Above you`ll also find....
One-IC two-tones Siren. Double-tone Police sound. Single-tone old ambulance sound. Circuit diagram: Parts: R1,R3 470K 1/4W Resistors R2 680K 1/4W...
This metal detector circuit needs to be powered using a 9 volts power supply ( DC) or a 9 volts battery. The C1 capacitor is a variable capacitor with a value of 365 pF, C2 is a 100pF silver mica capacitor, C3 is a 0.05 uF disc capacitor and the C4 is a 4.7....
An audio amplifier is an electronic amplifier that amplifies low-power audio signals (signals composed primarily of frequencies between 20 - 20 000 Hz, the human range of hearing) to a level suitable for driving loudspeakers and is the final stage in a....
A simple PLL FM demodulator circuit using IC XR2212 is shown here. XR2212 is a highly stable, monolithic PLL (phase locked loop) IC specifically designed for communication and control system applications. The IC has 0. 01 Hz to 300KHz frequency range, 4. 5....
The circuit diagram of an Automatic Street Light Controller Circuit is explained in this post....
A very simple and high quality TV transmitter circuit based on IC MC374 is shown in this article. MC1374 is an integrated TV modulator circuit that can be used in various TV transmitter applications. The MC1374 includes all necessary circuitries required for....
Low-Pass and High-Pass audio output signal filters. Additional Sound Source Low Pass filter and experimental original design puls-gate signal filter ("processor"), both of which have independent or linked together Voltage Control input option. The....
This is a project that I always wanted to do, but managed to put off for a long time. It has been over a year in the doing. Partly because there are so many good phono preamps in existence and I was slightly concerned that it was beyond my design skills. It....
An AC coupled unity gain gain voltage follower operating on a single supply is shown here. The voltage divider network of R1 and R2 provides a DC voltage equal to half the supply voltage to the non-inverting input of the 741. The output DC voltage therefore....
I finally got all of the materials I needed in to work on my arduino powered Diversity controller. The plan is to support 2 inputs (though the hardware can support up to 4 inputs), and 4 amplified outputs. The diversity will use RSSI to compare feeds and I....
This program includes circuit design cad, simulation, and auto routing PC layout. I also use PSPICE at Unisys which has more capabilities but costs 6 times as much and needs to be renewed yearly. With these requirements in mind, and some others, I decided on....
A Solar Engine is a circuit that takes in and stores electrical energy from solar cells, and when a predetermined amount has accumulated, it switches....
The NCP5810D is a dual ’output DC/DC converter which CAN generate both a positive and a negative voltage. The device is optimized for powering modules such as AMOLED Display drivers where very good output voltage accuracy and regulation, signal integrity and....
If you ever wanted to integrate RFID functionality into your project, this small tutorial might help you accomplish that. I used the RDM630 module from seeedstudio in its UART version. It comes on a small board with presoldered connectors which fits....
Using two of the most basic oscillators you can DIY, this particular circuit works great to modulate our main LFSR circuit. It also sounds pretty cool on its own. The main noise generator for our circuit. The basic circuit at play here is a Linear Feedback....
I`m looking for a circuit (the simpler and cheaper, the better) that can drive three or more LEDs at 200-350mA each, randomly flashing/strobing them at 5-20Hz. Input power should be low-voltage DC. A range for Vin, instead of an exact 5.0V or whatever, would....
This circuit uses a dual operational amplifier (TL082) to form a voltage-controlled oscillator (VCO). With the component values shown, the output-frequency range is 100 Hz to 10 kHz when the input control voltage is between 0. 05 and 10 V. ..
TDA8444is the D / A ( digital / analog ) converter IC produced by Philips, and it is used to convert digital signals to analog signals. 1. pin functions and dataTDA8444 IC uses 16-pin double-row package, andpin functions and data are shown in Table 1. 2.....
an easy to build, but nevertheless very accurate and useful digital voltmeter. It has been designed as a panel meter and can be used in DC power supplies or anywhere else it is necessary to have an accurate indication of the voltage present. The circuit....
Using Integrated Switching Regulators When it came to power supply design, most Engineers would scratch their head thinking, œWhere do I start? Decision must be decided concerning....
Each bistable circuit has two opposite-symmetry germanium transistors, two diodes, and four resistors. Additional transistor Q transfers conducting stage to next position when actuated by transfer pulse. Absence of capacitors gives high-speed operation. No....
Using an ATmega 2560 and therefore the heart of Arduino, we have developed a universal remote control with GSM. This allows to control 2IN/2OUT, DTMF key, gate control and GSM thermostat activated remotely. The remote control is easier, thanks to the....
This is a Low-dropout (LDO) Regulator circuit, constructed by using only a single PNP transistor. This circuit is directly related to load current. At very low....
Atmel`s ATtiny1634 8-Bit AVR ® Microcontroller is based on the AVR ® enhanced RISC architecture. By executing powerful instructions in a single clock cycle, the ATtiny1634 achieves throughputs approaching 1 MIPS per MHz allowing the system designer to....
Software-defined radios (SDRs) are used in all areas of communications including ham radio and SWL..
The circuit illustrated produces a short duration of rapidly-sequencing tones, invoking the stereotypical sonic imagery of a sophisticated computer, such as would be scripted for the science-fiction genre. I designed this circuit for use in the composition....
A very simple device allowing a quick check of common Infra-red Remote-Controls can be useful to the electronics amateur, frequently asked to repair or test these ubiquitous devices. A reliable circuit was designed with a handful of components: the LED will....
There are chips that have AND/OR/NOT gates, but I was wondering if there`s a single one that have all of the ones I need - if not, then what should I use specifically Any reason it has to be those particular gates For example a package with with four NOR....
Before three weeks i am introduced inverter circuit diagram but the circuit not included ac to inverter switching part so today i introducing a 230 Volt Ac to inverer switching circuit diagram. Circuit showing a inverter switching. Here i have used bc 558,....
This be delay timer circuit model to be simple. It be the character delays to close electric all appliances. By fix the time about 5 minute. It can fine....
This circuit is IC controlled emergency light. This series of automatic switching-on of the sunshine on mains failure and battery charger with overcharge protection. When mains is absent, the relay RL2 is in deenergised state, feeding battery offer to the....
Here s a cheaper and easier method of making a telephone headset adapter. All that s required is a cheap headset ($5 at Harvey Norman), a DPDT switch and....
Voltage Converter Circuit diagram for 3 volts to 5 volts (3v to 5v) using IC (CMOS Monolithic) MAX660 and MAX667-a positive voltage regulator..
Metal enclosure, forget the plastic case they sell, it`s nearly useless. ( I made a box from copper PCB that I soldered together, it works okay, but could be better. ) Ground it to the enclosure well, and connect everything to a good earth ground. 4. Make....
Design and Dimensioning of Aktive Low-Pass and High-Pass Filters. Sallen-Key and Multiple Feedback Topologies, Spice Netlist Generator....
Capacitor instrument is not to be used to measure the capacity of the capacitor but for identifing good or bad and short circuit or open circuit, then it provides a reliable quality assurance for the production of circuit to reduce the circuit making....
The enable signal for USB chip and GLCD controller were made by PLD decoder from the address lines. As we have seen the memory map for i/o of 8051SBC board, the available space is from 0x0300-0x07FF. The address range of 0x0300-0x03FF was used for USB chip....
A rear fog lamp has been mandatory for trailers and caravans in order to improve visibility under foggy conditions. When this fog lamp is switched on, the fog lamp of the pulling vehicle must be switched off to avoid irritating reflections. For this purpose,....
Here is a series of Touch Switch using only 3 transistors, this touch-based transistor switches can activate a load simply by the user touching a metal plate. It is designed to directly switch a relay to allow it to be used with large loads. As it uses only....
Combining of video signals with pulses is accompanied by inversion of input signal. Value of R4 is 270 ohms for 5670 and 470 ohms for 6021. R2 is 680 ohms for 5670 and 1 K for 6021. Input signals must be positive. -NBS, "Handbook Preferred Circuits Navy....
With a 9 V DC battery, it worked fine. But because of a less DC power, solenoid was not generating a powerful enough force. I modified a computer power supply as the power source. Now when providing +12 V (15. 0 A) power from it, the solenoid valve is pulled....
This PIC software combines frequency counter and frequency lock functions. By adding couple of transistors and operation amplifier TL082, it is possible to lock the LC oscillator frequency. Frequency reference is formed from the measured frequency itself....
This Atmel IC, is clocked in the circuit with a 12 MHz quartz and provides a communication between the Infrared receiver and the PC, so that this signal can being processed by infrared receiver programs like Girder. As soon as a valid RC5 signal of the....
This is a basic dark detector/sensor circuit diagram based on a Photo Resistor (LDR) and few numbers of parts....
Strictly speaking, this simple circuit shouldn`t work! How could anyone expect an ordinary light dependent resistor photo cell to `see` through a fingertip in natural daylight and detect the change in blood flow as the heart pulsates The secret is a high....
Another frequency-determining device is the CRYSTAL. The crystal may be used with a tank circuit, or it may perform alone. Crystals exhibit a characteristic known as the PIEZOELECTRIC EFFECT. The piezoelectric effect is the property of a crystal by which....
I have assembled the metronome circuit several times and it did not work. Two 555 manufacturers websites (ON Semiconductor and National Semiconductor) propose circuits that differ from yours in that pins 2/6/7 are not joined together but there is a resistor....
This 5 volt regulated power supply circuit project is designed using the NCP3155 DC DC switching regulator with fully integrated power switches and full fault protection. This 5 volt regulated power supply circuit project require few external electronic....
Using the LMD18200 3A H-Bridge designed by National Semiconductors for motion control applications can be designed a very simple motor controller electronic project. Ideal for driving DC and stepper motors; the LMD18200 accommodates peak output currents up....
FM Stereo decoder using TDA7388A very simple with a compact design FM stereo decoder schematic circuit can be designed using the TDA7388 IC manufactured by ST Microelectronics. The TDA7338 is a monolithic integrated stereo decoder with noise blanking for FM....
Here is the circuit diagram for simple door bell, you can assemble this circuit inside your room or home where as keep the switch outside your home or room that is easily noticable by the visitors. The working of this circuit is almost similar to my previous....
This regulated power supply can be adjusted between a few volts and 15V with P1 and with P2 adjust the upper limit ( 15. 0V ). R6 value is 0. 7V / Imax where Imax is the maximum current. At Imax = 5A, R6 is 0. 14 © T1 and T2 must have heatsinks because power....
The XC61H series is a highly accurate, low power consumption CMOS voltage detector with a delay circuit. Detect voltage is accurate with minimal temperature drift. Output configurations are available in both CMOS and N-channel open drain. Since the full....
the sound system, the massive de-sensitized, and they defeated a maximum range. This can be increased if desired, you can have two tone controls, the lifting of 10 dB and a cut and the other with a little help and very subtle 3dB cut - it is quite....
This is the circuit diagram of DC voltage doubler / DC converter. The circuit will convert 12VDC power supply to become a 24VDC at and 18VDC. Almost any PNP or NPN power transistors should be work for this circuit...
Figure A is the schematic of the microstrip single stage RF amplifier. The amplifier is based on the M/A-Com LF2810A MOSFET. The transistor is actually a 10 watt, 28 volt part, but provides adequate gain for this application at 12 VDC. The amplifier provides....
Often you find yourself in the position of needing to wind your own coil for a project, or maybe you come across an unmarked coil in the junk-box. How can you bestnd out its inductance An oscilloscope is all you need. Construct a resonant circuit using the....
The circuit is based on the theory that insects like mosquito can be repelled by using sound frequencies in the ultrasonic (above 20KHz) range. The circuit is nothing but a PLL IC CMOS 4047 wired as an oscillator working at 22KHz. A complementary symmetry....
