New Circuits Page 108
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The sensors are a thin strip of piezoelectric material with a rivet in the end acting as a weight. When there is a vibration, the weight moves, stressing the piezo material that produces a spike in voltage. This voltage that is created may be up to 90V. We....
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Using a CMOS IC TT8486A TT6061A you can build a very simple dimmer circuit which can be used to control intensity of an incandescent lamb by simply touch a contact. This electronic touch dimmer circuit can increase the light intensity of incandescent lamps....
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This Guitar Amplifier electronic architecture adopts a able-bodied accustomed ambit cartography for the ability amplifier, application a single-rail accumulation of about 60V and capacitor-coupling for the speaker(s). The advantages for a guitar amplifier....
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Speaker relay delay controlling circuit for audio amplidier..
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74HCU04 is a chip that was made for this purpose, HCT may not work for such a circuit. C1 and C2 can go to upto 33pF and R2 can be increased to make R2 * C2 = t. The circuit above is a parallel resonant oscillator circuit. The Crystal works by the....
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The circuit claimed has a high movement sensitivity. Even air moving (hot air rising, wind blowing) will trigger it when the trimpot is set near the most sensitive position. The transmitter sends out a steady ultrasonic tone at 40kHz. At this frequency the....
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This circuit uses a 1458 dual op-amp to form a radar detector. C1 is the detector of the radar signal. The first op-amp forms a current-to-voltage converter and the second op-amp buffers the output to drive the piezo transducer. R5 sets the switching....
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The infra-red receiver requires the infra-red light to be modulated at 38 kHz, this is quivalent to a period of 26 µs. The specifications on the receiver suggested using a 50% duty cycle. We found however that this did not work the way we intended. To....
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Here is the circuit diagram of V/F Converter in negative input voltage. It uses the VFC32 voltage-to-frequency converter. This VFC32 used to be applied in...
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When Q1 is active, a larger current begins to flow through L1 to GND. When Q1 is switched off, the current through L1 trys to remain the same as it was, causing an increased voltage. By varying the PWM duty cycle, the current through L1 and output voltage....
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The heart of the circuit consists of the Arduino microprocessor which is indicated by the header pins on the left of the circuit schematic shown on the right (click to open in new window). Two of the analog inputs (0 and 1) are connected to the emitter sides....
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The system adopts the modular design, the one-chip computer AT89S52 and CPLD is CPU of the overall system, the coordination of the control system. Set up the cycle of the systematic pulse signal through 4G—4 key set module at first, choose the output mode of....
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This DC to AC inverter circuit work based on unstable multi vibrator does. In this circuit, IC CD4047 is chosen as a heart of unstable multivibrator, because this IC type gives a complementary output that has opposite phase to another ( pin 10 and 11 as seen....
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At the time, I wanted to build The Ultimate Continuity Tester, and I established a wish list of all the features I required: A real continuity tester. Too many multimeters and sounders react at resistances as high as hundreds or even thousands of ohms,....
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The Wien bridge sine wave oscillator to introduce is the oscillator which works in the oscillation by returning(positive feedback) the oscillation output to the input. The point of this circuit is the negative feedback circuit to make the oscillation....
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The new design of a tutorial board based on the popular PIC16F84A microcontroller. Have a features eight single leds, an LCD display and five push ....
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RS-232 system connection faster and easier, But distance is not far. so to change to use the system RS-485 with this RS-232 to RS-485 converter projects. It....
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Here`s a small FM transmitter ciruit for your desktop or laptop to enjoy the movie and music from a distance. This FM transmitter, which is powered by USB, recovers output on your computer or your MP3 player to the relay on the tape FM (frequency 108 MHz).....
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This basic ultrasonic generator can be built easily and quickly. An NE555 drives a speaker. The frequency range is 12 to 50 kHz. SPKRI is a piezo tweeter, etc. ..
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To start old Optrex DMC50264N LCD module you need to get +24V LCD bias voltage Where to get it if you have only low voltage 3 5V As LCD module drains very low current, it is possible to build very small DC/DC converter. There are lots of chips designed for....
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The keypad circuitry is based around a PIC1652 microcontroller that was manufactured by General Instruments. The PIC1652 is an 8-bit microcontroller with RISC-like features and has a 33 single-word instruction set. It supports direct, indirect and relative....
-
Always use shielded LWDAQ Cable to connect the A3018 to the LWDAQ Driver, not Ethernet cables. The shielding stops the cable acting like a radio-frequency antenna. The correct wiring gives the data transfer more immunity to static discharge, as we discuss....
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-
This NiCAD battery charger circuit charges the battery at 75 mA until the battery is charged, then it reduces the current to a trickle rate. It will fully recharge a dead/unpowered battery in 4 hours and the battery can be left in the charger indefinitely.....
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This circuit lets an external 12V SLA battery power a camcorder which normally has an inbuilt 7. 2V battery. Such batteries can now be very difficult or expensive to obtain for earlier model camcorders. In essence, the circuit is a standard LM317 adjustable....
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A light dimmer is quite unusual in a caravan or on a boat. Here we describe how you can make one. So if you would like to be able to adjust the mood when y....
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The ambit of frequencies for the FM advertisement bandage is 90MHz (MHz = Megahertz or 90 actor cycles per second). Because the FM microphone has a capricious acquainted circuit, it can be acquainted to a quiet atom on your bounded FM advertisement bandage....
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With the aid of an (old) moving coil instrument it is very little effort to make a simple voltmeter that, at a glance, indicates the status of a telephone line. Because the input impedance of this circuit is very high, there is no problem in having it....
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Converter 12 VDC to 220 VAC is a tool that can convert the DC voltage of 12 volts to 220 volts AC. Circuits converter 12 volt DC to 220V AC in the figure below is an example of a simple converter circuit. Dc to ac converter Circuits can be used to provide....
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I don`t like motor potentiometers, especially if there are cheap and small attenuators but big motors. But big blue alps like ebay item No....
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The inverter circuit diagram composed of NE555 is shown as the chart, and it can turn +12V DC battery voltage to 220V AC output voltage. In the circuit, NE555 circuit is the oscillator, the oscillation frequency is decided by the R1, RP1 and C1, and....
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A few time ago I decided to create a media center box to replace my DVD player, sattelite receiver, VCR and my kid`s Play Station 2, toone device. So, I made a core 2 duo processor system that actually replaced with succeed, all my electronic devices. The....
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This circuit is connected to your motorcycle. It`s tapped into a circuit thats only powered with the key "ON". If you turn the bike off with the kill-switch and leave the key on, as you know, the headlight will stay on and quickly drain the battery. With....
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Extract of another SC article which deals with a simple programmable TCI with nearly the same trigger input circuits than DIY-CDI. Good for us, the trigger circuits are describted in more details than the DIY-CDI article. The DIY-CDI will not only will work....
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This Instructable covers the assembly of a circuit capable of PWM-ing ( pulse width modulating ) a high-power RGB LED strip and programming an Arduino to cycle through a range of colors. In this context, high power is 9-12 volts. I will discuss how to....
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Here is a simple SWR protection circuit you can easily build. The directional coupler and detector components are from an old VHF SWR meter. You may want to replace the meter`s existing RF bypass Capacitors with higher quality (mica) ones. You may also want....
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This transceiver (combined transmitter and receiver) built by Walter KrG¤mbring uses an Auriel devices for transmission and reception. This device packs a bit more power than the other, as he uses a voltage converter to get 12V to power the transmitter. As....
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Here is a simple circuit based on two transistors that can be acclimated to ascendancy the acceleration of a 12 V DC fan depending on the temperature. A thermistor (R1) is acclimated to faculty the temperature. When the temperature increases the abject....
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If you want to connect a video signal to several destinations, you need a distribution amplifier to match the 75-ohm video cable. A distribution amplifier terminates the incoming cable in 75 ohms and provides several outputs, each with 75-ohm output....
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One day I bought an old pong console from an old lady at a flea market. When I got back at home I hooked it up to the TV But the problem was that I didn`t have the AC adapter for it So I took C batteries to insert them in the console but when I removed the....
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This simple circuit and program listing allows the Maximite microcomputer (SILICON CHIP, March-May 2011) to control a stepper motor. It could be expanded to allow for the control of multiple motors, with four of the Maximite`s external I/O pins used to....
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Ql and Q2 switch the primary windings of transformer Tl via a square wave at a frequency determined by its magnetic properties. Diodes Dl and D2 provide base return paths for the feedback current of Ql and Q2. The output winding of T1 is connected to a....
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The circuit below uses a CMOS dual D flip flop (CD4013) to toggle a relay or other load with a momentary push button. Several push buttons can be wired in parallel to control the relay from multiple locations. A high level from the push button is coupled to....
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Four-wire ballast connection of fluorescent There are four lead wires in four-wire ballast, including main and auxiliary coils. The connection of two lead wires in main coil is the same with second-line ballast, both of them connect between the lamp and....
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The 220V AC mains supply is downconverted to 9V AC by transformer X1. The transformer output is rectified by diodes D1 through D4 wired in bridge configuration and the positive DC supply is directly connected to the charger`s output contact, while the....
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A 2001 cavelier. the other day one of my low beam headlights quit, i replaced the balb it still doesnt work. when i pull it into gear the daytime driving lights flash a bunch of times then go off and the service light is on. i have check the wires under the....
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This is the remainder of the receiver, including the post mixer amplifier, variable crystal filter, i. f. amplifier, product detector, local oscillator, receiver muting, and audio amplifier. The transmit section, showing the local oscillator, Tx single....
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This Car LED Light Sequencer uses a standard 74C164 8 bit shift register as its heart of operation. The 74C164 is also known as a 8-Bit Parallel-Out Serial Shift Register which is a monolithic complementary MOS (CMOS) integrated circuit. These 8-bit shift....
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It delivers safely around 20Amps at 13. 8V. For lower currents, a separate current limiting output, capable of 15ma up to a total of 20A has been added. Let us see what we have got here. The power transformer should be capable to deliver at least 25A at 17.....
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This tiny receiver is not much bigger than an AA cell. It is powered off two LR44 button cells, which are expensive and I assume wouldn`t last terribly long. I`ll be on the lookout for LR44`s at the markets and $2 shops now that I`ve got this radio! As with....
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Using any camera in a dull or dark environment generally requires the use of supplementary light. This is a standard technique, and even where adequate na....
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Tone control circuit is an electronic circuit which is designed to manipulate the tone of audio signal. Tone of audio signal is analog to color in light. We....
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Combine the SATL and SAVL together. The schematic was updated with the voltage sensing circuit, I added in a Mosfet so that we only draw power from the voltage source when needed and you`ll notice there are 2 jumpersTemp and Volt. You can switch between....
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Powered with solar panel, the circuit will give you 5V pure regulated DC voltage. The circuit is made up of an oscillator transistor as well as a regulator transistor. The solar panel charges the battery when sunlight is bright enough to generate a voltage....
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The preamplifier is intended for use with dynamic (moving coilMC) microphones with an impedance up to 200 ? and balanced terminals. It is a fairly simple....
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Creating a 2-bit alu. It has 8 defined functions (the functions are defined by a 3bit code), AND XOR etc, and these functions act on two, 2-bit binary numbers and produce a 2-bit answer. From what I have done so far, I have a decoder that decodes what the....
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The VHF frequency is generated by a tuned Hartley oscillator circuit. Resistors R2, R3, and R4 bias the transistor, with tapped inductor LI and trimmer capacitor Cl forming the tank circuit. Adjusting Cl determines the frequency. Capacitor C2 provides....
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The second half of the circuit is an inverting integrator. The first op-amp starts with its two inputs in an unknown state; let`s say it starts with + slightly higher than (which is at ground). The op-amp greatly amplifies this difference, bringing its....
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This is a very simple -5V supply using one 555, useful for analog blocks using FET Opamps using low power. This circuit came up when i had to design limited by inventory. It worked well for its need. It converts Positive Five Volts to Negative Five Volts to....
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To celebrate the hundredth design posted to this website, and to fulfil the requests of many correspondents wanting an amplifier more powerful than the 25W MosFet, a 60 - 90W High Quality power amplifier design is presented here. Circuit topology is about....
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The operation of the 6CL6 transmitter is actually quite sophisticated, despite the simple appearance of the circuit. The heart of the circuit is the electron-coupled crystal oscillator shown above. This circuit combines the functions of oscillator and....
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Simple PWM inverter circuit using SG3524. This PWM inverter circuit has 12V input, 220V output and 250 watt output power. Output power can be extended....
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This infrared alarm barrier can be used to detect persons passing through doorways, corridors and small gates. The transmitter emits a beam of infrared light which is invisible to the human eye. The buzzer at the output of the receiver is activated when the....
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Clock and Load functions, with Load being the first function described. U5, CD4013, performs the load function by controlling whether the shift register ICs are in the parallel or serial mode. For 99. 99% of the time, the shift registers are in the serial....
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The Z3816A is a GPS disiplined timing source that was manufactured by HP in the middle 90`s. It was intended for use in cellular telephone equipment. It provides 10 output signals through sma connectors on the back panel. 1 PPS - from the 4 connectors on the....
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This circuit is 73 MHz Hallogene Radio-Controlled Lights. The purpose is to control the power state of a hallogene light by remote control. When we press the push of a remote control Botton, state lamp power will change, so, if the lamp is lit, it will be....
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Zero crossing detector(ZCD) is a voltage comparator that switches the output between +Vsat and Vsat (Vsat: Saturation voltage almost equal to 14V) when the input crosses zero reference voltage. Then what is a comparator In simple words comparators are basic....
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Uses MM5316 alarm-clock IC, originally designed to drive LCD or fluorescent displays, but modified here for LED display Diodes and batteries provide power if AC fails, with blanking of display to extend battery life. Accuracy is poor on batteries but....
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Does does it forget to be erased the small lamp and the headlight of the car, the battery go up, and is there what to the engine has not started once and twice everyone I am using it for a long time since then thinking about the circuit that prevents this in....
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This is a circuit diagram of a simple circuit in which the LED burning can be activated only by a gust OFF. A condenser mic (M1) is used to feel your breath. When the S1 button is pressed, transistors Q2 and Q3 as a couple wires attached will be activated....
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Conventionally a MOSFET with a voltage rating of 1500V or with a Half-Bridge connection using two MOSFETs of 800-900V, would be used for SMPS applications requiring input voltages higher than 380Vac. However, these methods have the disadvantages of a....
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This circuit turns-off an amplifier or any other device when a low level audio signal fed to its input is absent for 15 minutes at least. Pushing P1 the device is switched-on feeding any appliance connected to SK1. Input audio signal is boosted and squared....
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The ADXL362 is an ultralow power, 3-axis MEMS accelerometer that consumes less than 2 ?A at a 100 Hz output data rate and 270 nA when in motion triggered wake-up mode. Unlike accelerometers that use power duty cycling to achieve low power consumption, the....
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The SC9270C/ SC9270D is a complete DTMF receiver integrating both the bandsplit Filter and digital decoder functions. The Filter section uses switched capacitor techniques for high- and low-group Filters and dial-tone rejection. Digital counting techniques....
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This is an enhanced version of the simple Garage/Shed Alarm. The Entry and Exit delays have been increased to about 30-seconds - and I`ve added a timed Siren cut-off and automatic Reset. I`ve also replaced the LED with an entry Buzzer. These enhancements....
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In this power stabilizer circuit, one relay is wired to select the high or the low tap from the stabilizer transformer at some particular voltage level; whereas the second relay keeps the normal mains voltage switched in, but the moment there`s a voltage....
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Using SimPLL`s new PLL Wizard you can design a new PLL with a few clicks of the mouse. We have just designed one that tunes from 150MHz to 170MHz in 25kHz steps using a LMX2306 PLL IC and a MiniCircuits POS300 VCO. and because the LMX2306 and MiniCircuits....
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Firecrackers are normally ignited by using a matchstick or a candle. You have to run away quickly after igniting the fuse of the firecracker. This method of igniting firecracker is unsafe, because the danger of the firecracker bursting before you reach a....
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This is a Universal version of the Four-Digit Alarm Control Keypad. I have modified the design to free up the relay contacts. This allows the circuit to operate as a general-purpose switch. I`ve used a SPCO/SPDT relay - but you can use a multi-pole relay if....
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This simple circuit enables you to listen to your heartbeat, for instance, while you are exercising. The transducer used for detecting the pulse is an ele....
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The voltage regulator circuit was constructed using the LM317T, 3 terminal regulator. A heatsink was utilized to cool down the LM317T. The output voltage can be set to anywhere in the range of 1. 5 volts to 30 volts. However, for our application we needed a....
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Here`s a small LM386-based square-wave oscillator built from the following schematic. I replaced the 30k resistor with a 50k Potentiometer from my stash of parts which then, of course, acts as a pitch controller. The following audio is some track recordings....
The sensors are a thin strip of piezoelectric material with a rivet in the end acting as a weight. When there is a vibration, the weight moves, stressing the piezo material that produces a spike in voltage. This voltage that is created may be up to 90V. We....
Using a CMOS IC TT8486A TT6061A you can build a very simple dimmer circuit which can be used to control intensity of an incandescent lamb by simply touch a contact. This electronic touch dimmer circuit can increase the light intensity of incandescent lamps....
This Guitar Amplifier electronic architecture adopts a able-bodied accustomed ambit cartography for the ability amplifier, application a single-rail accumulation of about 60V and capacitor-coupling for the speaker(s). The advantages for a guitar amplifier....
74HCU04 is a chip that was made for this purpose, HCT may not work for such a circuit. C1 and C2 can go to upto 33pF and R2 can be increased to make R2 * C2 = t. The circuit above is a parallel resonant oscillator circuit. The Crystal works by the....
The circuit claimed has a high movement sensitivity. Even air moving (hot air rising, wind blowing) will trigger it when the trimpot is set near the most sensitive position. The transmitter sends out a steady ultrasonic tone at 40kHz. At this frequency the....
This circuit uses a 1458 dual op-amp to form a radar detector. C1 is the detector of the radar signal. The first op-amp forms a current-to-voltage converter and the second op-amp buffers the output to drive the piezo transducer. R5 sets the switching....
The infra-red receiver requires the infra-red light to be modulated at 38 kHz, this is quivalent to a period of 26 µs. The specifications on the receiver suggested using a 50% duty cycle. We found however that this did not work the way we intended. To....
Here is the circuit diagram of V/F Converter in negative input voltage. It uses the VFC32 voltage-to-frequency converter. This VFC32 used to be applied in...
When Q1 is active, a larger current begins to flow through L1 to GND. When Q1 is switched off, the current through L1 trys to remain the same as it was, causing an increased voltage. By varying the PWM duty cycle, the current through L1 and output voltage....
The heart of the circuit consists of the Arduino microprocessor which is indicated by the header pins on the left of the circuit schematic shown on the right (click to open in new window). Two of the analog inputs (0 and 1) are connected to the emitter sides....
The system adopts the modular design, the one-chip computer AT89S52 and CPLD is CPU of the overall system, the coordination of the control system. Set up the cycle of the systematic pulse signal through 4G—4 key set module at first, choose the output mode of....
This DC to AC inverter circuit work based on unstable multi vibrator does. In this circuit, IC CD4047 is chosen as a heart of unstable multivibrator, because this IC type gives a complementary output that has opposite phase to another ( pin 10 and 11 as seen....
At the time, I wanted to build The Ultimate Continuity Tester, and I established a wish list of all the features I required: A real continuity tester. Too many multimeters and sounders react at resistances as high as hundreds or even thousands of ohms,....
The Wien bridge sine wave oscillator to introduce is the oscillator which works in the oscillation by returning(positive feedback) the oscillation output to the input. The point of this circuit is the negative feedback circuit to make the oscillation....
The new design of a tutorial board based on the popular PIC16F84A microcontroller. Have a features eight single leds, an LCD display and five push ....
RS-232 system connection faster and easier, But distance is not far. so to change to use the system RS-485 with this RS-232 to RS-485 converter projects. It....
Here`s a small FM transmitter ciruit for your desktop or laptop to enjoy the movie and music from a distance. This FM transmitter, which is powered by USB, recovers output on your computer or your MP3 player to the relay on the tape FM (frequency 108 MHz).....
This basic ultrasonic generator can be built easily and quickly. An NE555 drives a speaker. The frequency range is 12 to 50 kHz. SPKRI is a piezo tweeter, etc. ..
To start old Optrex DMC50264N LCD module you need to get +24V LCD bias voltage Where to get it if you have only low voltage 3 5V As LCD module drains very low current, it is possible to build very small DC/DC converter. There are lots of chips designed for....
The keypad circuitry is based around a PIC1652 microcontroller that was manufactured by General Instruments. The PIC1652 is an 8-bit microcontroller with RISC-like features and has a 33 single-word instruction set. It supports direct, indirect and relative....
Always use shielded LWDAQ Cable to connect the A3018 to the LWDAQ Driver, not Ethernet cables. The shielding stops the cable acting like a radio-frequency antenna. The correct wiring gives the data transfer more immunity to static discharge, as we discuss....
This NiCAD battery charger circuit charges the battery at 75 mA until the battery is charged, then it reduces the current to a trickle rate. It will fully recharge a dead/unpowered battery in 4 hours and the battery can be left in the charger indefinitely.....
This circuit lets an external 12V SLA battery power a camcorder which normally has an inbuilt 7. 2V battery. Such batteries can now be very difficult or expensive to obtain for earlier model camcorders. In essence, the circuit is a standard LM317 adjustable....
A light dimmer is quite unusual in a caravan or on a boat. Here we describe how you can make one. So if you would like to be able to adjust the mood when y....
The ambit of frequencies for the FM advertisement bandage is 90MHz (MHz = Megahertz or 90 actor cycles per second). Because the FM microphone has a capricious acquainted circuit, it can be acquainted to a quiet atom on your bounded FM advertisement bandage....
With the aid of an (old) moving coil instrument it is very little effort to make a simple voltmeter that, at a glance, indicates the status of a telephone line. Because the input impedance of this circuit is very high, there is no problem in having it....
Converter 12 VDC to 220 VAC is a tool that can convert the DC voltage of 12 volts to 220 volts AC. Circuits converter 12 volt DC to 220V AC in the figure below is an example of a simple converter circuit. Dc to ac converter Circuits can be used to provide....
I don`t like motor potentiometers, especially if there are cheap and small attenuators but big motors. But big blue alps like ebay item No....
The inverter circuit diagram composed of NE555 is shown as the chart, and it can turn +12V DC battery voltage to 220V AC output voltage. In the circuit, NE555 circuit is the oscillator, the oscillation frequency is decided by the R1, RP1 and C1, and....
A few time ago I decided to create a media center box to replace my DVD player, sattelite receiver, VCR and my kid`s Play Station 2, toone device. So, I made a core 2 duo processor system that actually replaced with succeed, all my electronic devices. The....
This circuit is connected to your motorcycle. It`s tapped into a circuit thats only powered with the key "ON". If you turn the bike off with the kill-switch and leave the key on, as you know, the headlight will stay on and quickly drain the battery. With....
Extract of another SC article which deals with a simple programmable TCI with nearly the same trigger input circuits than DIY-CDI. Good for us, the trigger circuits are describted in more details than the DIY-CDI article. The DIY-CDI will not only will work....
This Instructable covers the assembly of a circuit capable of PWM-ing ( pulse width modulating ) a high-power RGB LED strip and programming an Arduino to cycle through a range of colors. In this context, high power is 9-12 volts. I will discuss how to....
Here is a simple SWR protection circuit you can easily build. The directional coupler and detector components are from an old VHF SWR meter. You may want to replace the meter`s existing RF bypass Capacitors with higher quality (mica) ones. You may also want....
This transceiver (combined transmitter and receiver) built by Walter KrG¤mbring uses an Auriel devices for transmission and reception. This device packs a bit more power than the other, as he uses a voltage converter to get 12V to power the transmitter. As....
Here is a simple circuit based on two transistors that can be acclimated to ascendancy the acceleration of a 12 V DC fan depending on the temperature. A thermistor (R1) is acclimated to faculty the temperature. When the temperature increases the abject....
If you want to connect a video signal to several destinations, you need a distribution amplifier to match the 75-ohm video cable. A distribution amplifier terminates the incoming cable in 75 ohms and provides several outputs, each with 75-ohm output....
One day I bought an old pong console from an old lady at a flea market. When I got back at home I hooked it up to the TV But the problem was that I didn`t have the AC adapter for it So I took C batteries to insert them in the console but when I removed the....
This simple circuit and program listing allows the Maximite microcomputer (SILICON CHIP, March-May 2011) to control a stepper motor. It could be expanded to allow for the control of multiple motors, with four of the Maximite`s external I/O pins used to....
Ql and Q2 switch the primary windings of transformer Tl via a square wave at a frequency determined by its magnetic properties. Diodes Dl and D2 provide base return paths for the feedback current of Ql and Q2. The output winding of T1 is connected to a....
The circuit below uses a CMOS dual D flip flop (CD4013) to toggle a relay or other load with a momentary push button. Several push buttons can be wired in parallel to control the relay from multiple locations. A high level from the push button is coupled to....
Four-wire ballast connection of fluorescent There are four lead wires in four-wire ballast, including main and auxiliary coils. The connection of two lead wires in main coil is the same with second-line ballast, both of them connect between the lamp and....
The 220V AC mains supply is downconverted to 9V AC by transformer X1. The transformer output is rectified by diodes D1 through D4 wired in bridge configuration and the positive DC supply is directly connected to the charger`s output contact, while the....
A 2001 cavelier. the other day one of my low beam headlights quit, i replaced the balb it still doesnt work. when i pull it into gear the daytime driving lights flash a bunch of times then go off and the service light is on. i have check the wires under the....
This is the remainder of the receiver, including the post mixer amplifier, variable crystal filter, i. f. amplifier, product detector, local oscillator, receiver muting, and audio amplifier. The transmit section, showing the local oscillator, Tx single....
This Car LED Light Sequencer uses a standard 74C164 8 bit shift register as its heart of operation. The 74C164 is also known as a 8-Bit Parallel-Out Serial Shift Register which is a monolithic complementary MOS (CMOS) integrated circuit. These 8-bit shift....
It delivers safely around 20Amps at 13. 8V. For lower currents, a separate current limiting output, capable of 15ma up to a total of 20A has been added. Let us see what we have got here. The power transformer should be capable to deliver at least 25A at 17.....
This tiny receiver is not much bigger than an AA cell. It is powered off two LR44 button cells, which are expensive and I assume wouldn`t last terribly long. I`ll be on the lookout for LR44`s at the markets and $2 shops now that I`ve got this radio! As with....
Using any camera in a dull or dark environment generally requires the use of supplementary light. This is a standard technique, and even where adequate na....
Tone control circuit is an electronic circuit which is designed to manipulate the tone of audio signal. Tone of audio signal is analog to color in light. We....
Combine the SATL and SAVL together. The schematic was updated with the voltage sensing circuit, I added in a Mosfet so that we only draw power from the voltage source when needed and you`ll notice there are 2 jumpersTemp and Volt. You can switch between....
Powered with solar panel, the circuit will give you 5V pure regulated DC voltage. The circuit is made up of an oscillator transistor as well as a regulator transistor. The solar panel charges the battery when sunlight is bright enough to generate a voltage....
The preamplifier is intended for use with dynamic (moving coilMC) microphones with an impedance up to 200 ? and balanced terminals. It is a fairly simple....
Creating a 2-bit alu. It has 8 defined functions (the functions are defined by a 3bit code), AND XOR etc, and these functions act on two, 2-bit binary numbers and produce a 2-bit answer. From what I have done so far, I have a decoder that decodes what the....
The VHF frequency is generated by a tuned Hartley oscillator circuit. Resistors R2, R3, and R4 bias the transistor, with tapped inductor LI and trimmer capacitor Cl forming the tank circuit. Adjusting Cl determines the frequency. Capacitor C2 provides....
The second half of the circuit is an inverting integrator. The first op-amp starts with its two inputs in an unknown state; let`s say it starts with + slightly higher than (which is at ground). The op-amp greatly amplifies this difference, bringing its....
This is a very simple -5V supply using one 555, useful for analog blocks using FET Opamps using low power. This circuit came up when i had to design limited by inventory. It worked well for its need. It converts Positive Five Volts to Negative Five Volts to....
To celebrate the hundredth design posted to this website, and to fulfil the requests of many correspondents wanting an amplifier more powerful than the 25W MosFet, a 60 - 90W High Quality power amplifier design is presented here. Circuit topology is about....
The operation of the 6CL6 transmitter is actually quite sophisticated, despite the simple appearance of the circuit. The heart of the circuit is the electron-coupled crystal oscillator shown above. This circuit combines the functions of oscillator and....
Simple PWM inverter circuit using SG3524. This PWM inverter circuit has 12V input, 220V output and 250 watt output power. Output power can be extended....
This infrared alarm barrier can be used to detect persons passing through doorways, corridors and small gates. The transmitter emits a beam of infrared light which is invisible to the human eye. The buzzer at the output of the receiver is activated when the....
Clock and Load functions, with Load being the first function described. U5, CD4013, performs the load function by controlling whether the shift register ICs are in the parallel or serial mode. For 99. 99% of the time, the shift registers are in the serial....
The Z3816A is a GPS disiplined timing source that was manufactured by HP in the middle 90`s. It was intended for use in cellular telephone equipment. It provides 10 output signals through sma connectors on the back panel. 1 PPS - from the 4 connectors on the....
This circuit is 73 MHz Hallogene Radio-Controlled Lights. The purpose is to control the power state of a hallogene light by remote control. When we press the push of a remote control Botton, state lamp power will change, so, if the lamp is lit, it will be....%2Busing%2Bop%2Bamp%2B741%2Bic%2B.png "Zero Crossing Detector (ZCD): Comparator circuit using 741 op amp")
Zero crossing detector(ZCD) is a voltage comparator that switches the output between +Vsat and Vsat (Vsat: Saturation voltage almost equal to 14V) when the input crosses zero reference voltage. Then what is a comparator In simple words comparators are basic....
Uses MM5316 alarm-clock IC, originally designed to drive LCD or fluorescent displays, but modified here for LED display Diodes and batteries provide power if AC fails, with blanking of display to extend battery life. Accuracy is poor on batteries but....
Does does it forget to be erased the small lamp and the headlight of the car, the battery go up, and is there what to the engine has not started once and twice everyone I am using it for a long time since then thinking about the circuit that prevents this in....
This is a circuit diagram of a simple circuit in which the LED burning can be activated only by a gust OFF. A condenser mic (M1) is used to feel your breath. When the S1 button is pressed, transistors Q2 and Q3 as a couple wires attached will be activated....
Conventionally a MOSFET with a voltage rating of 1500V or with a Half-Bridge connection using two MOSFETs of 800-900V, would be used for SMPS applications requiring input voltages higher than 380Vac. However, these methods have the disadvantages of a....
This circuit turns-off an amplifier or any other device when a low level audio signal fed to its input is absent for 15 minutes at least. Pushing P1 the device is switched-on feeding any appliance connected to SK1. Input audio signal is boosted and squared....
The ADXL362 is an ultralow power, 3-axis MEMS accelerometer that consumes less than 2 ?A at a 100 Hz output data rate and 270 nA when in motion triggered wake-up mode. Unlike accelerometers that use power duty cycling to achieve low power consumption, the....
The SC9270C/ SC9270D is a complete DTMF receiver integrating both the bandsplit Filter and digital decoder functions. The Filter section uses switched capacitor techniques for high- and low-group Filters and dial-tone rejection. Digital counting techniques....
This is an enhanced version of the simple Garage/Shed Alarm. The Entry and Exit delays have been increased to about 30-seconds - and I`ve added a timed Siren cut-off and automatic Reset. I`ve also replaced the LED with an entry Buzzer. These enhancements....
In this power stabilizer circuit, one relay is wired to select the high or the low tap from the stabilizer transformer at some particular voltage level; whereas the second relay keeps the normal mains voltage switched in, but the moment there`s a voltage....
Using SimPLL`s new PLL Wizard you can design a new PLL with a few clicks of the mouse. We have just designed one that tunes from 150MHz to 170MHz in 25kHz steps using a LMX2306 PLL IC and a MiniCircuits POS300 VCO. and because the LMX2306 and MiniCircuits....
Firecrackers are normally ignited by using a matchstick or a candle. You have to run away quickly after igniting the fuse of the firecracker. This method of igniting firecracker is unsafe, because the danger of the firecracker bursting before you reach a....
This is a Universal version of the Four-Digit Alarm Control Keypad. I have modified the design to free up the relay contacts. This allows the circuit to operate as a general-purpose switch. I`ve used a SPCO/SPDT relay - but you can use a multi-pole relay if....
This simple circuit enables you to listen to your heartbeat, for instance, while you are exercising. The transducer used for detecting the pulse is an ele....
The voltage regulator circuit was constructed using the LM317T, 3 terminal regulator. A heatsink was utilized to cool down the LM317T. The output voltage can be set to anywhere in the range of 1. 5 volts to 30 volts. However, for our application we needed a....
Here`s a small LM386-based square-wave oscillator built from the following schematic. I replaced the 30k resistor with a 50k Potentiometer from my stash of parts which then, of course, acts as a pitch controller. The following audio is some track recordings....
