Popular Circuits Page 151
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Hi folks. I`m new to the forum and relatively new to diy electronics. My current project involves trying to make a battery-powered LED dimmer circuit. ....
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Colour sensor is an interesting project for hobbyists. The cir- cuit can sense eight colours, i.e. blue, green and red (primary colours); magenta, yellow and cyan (secondary colours); and black and white. The circuit is based on the fundamentals of optics....
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This is a very small telephone exchange attached only two ordinary Tele phones. Fully bi-directional facility with an intercom system. When a phone is in off hook condition , Exchange will detect it & send ringing pulse to other phone. When it will be picked....
-
The LM4610 uses DC? signal to control the tone (bass/treble), volume, and balance circuit.?? The advantages of using DC control is that you can use a mono...
-
Here s a design of signals logic tester that is using indicate on a common cathode seven-segment display, if entry is at logic level ""1"" (one H on the display) or logic level (one L on the display). If an undefined level is detected will display ....
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The Nutchip decodes the signal, differentiating between immediate and delayed sensors (aside from true remote control signals used for switching the circuit on and off). As for all radio-based designs, always remember that a good radio receiver cannot....
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Amplifiers which run from 12V DC generally don t put out much power and they are usually not hifi as well. But this little stereo amplifier ticks the powe....
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No description available...
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This UHF wideband amplifier(Ultra High Frequency amplifier) has a total gain of 10 to 15 dB in the 400 850 MHz domain frequency so it can be used where the tv signal is weak. For this UHF antenna tv amplifier to work correctly you need to cut the components....
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The circuit protects a solid-state relay from overloads. The circuit limits current, automatically disconnects the load after ..
-
The LTC®4010 and LTC4011 are NiCd/NiMH battery
chargers that simplify Nickel-based battery charger
design and include power control and charge termination
for fast charging up to 16 series-connected cells using a
synchronous buck topology. The LTC4011....
-
A power filter is a device you put ahead of something like a GPS and MP3 player and or radar detector that you have run into the Aux Circuit. But these things used properly and properly installed will take the modulator noise out of any system. If you were....
-
This is transmitters circuit that can transmit both FM and AM signal simultaneously at two different frequencies FM in 100Mhz and Am in 20 MHz. Here is the ....
-
-
The STI7167 uses state-of-the-art process technology to provide a fully featured HD AVC DVB-C and DVB-T Demodulator and decoder IC. It is a highly integrated system-on-chip suitable for STB markets across cable, terrestrial, and terrestrial/IP hybrid....
-
An alternative to the infamous ROG `s Ruby amp. As you see it shares with the Ruby the same topology: a buffer and a chip amp. It uses a JFET buffer with a MPF102 and the 1W TDA7052 chip. It is a clean amp and it reacts very well with any pedal in front of....
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This transmitter is basic but allows transmission of audio to an AM radio. It consists of an RF oscillator operating in the AM broadcast band, together with a modulator stage, which mixes the incoming audio and the RF ..
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U1A, an op amp, oscillates at the frequency at which the phase shift in the Wien bridge network is exactly zero degrees. Changing bridge component values changes the oscillator frequency. In this circuit, we need change only the two resistors to do this. S1A....
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Parts List The circuit consists of preamplifier, tone controls, and regulated DC power supply, while providing a power output of 18 Watts for 8 Ohm load a....
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Use this circuit for checking fundamental oscillates, Q2 conducts and the LED lights. A3 HF crystals on a "Go-No-Go" basis. An untuned or 6V, 40mA bulb could be substituted for the Colpitts oscillator drives a voltage multiplier LED..
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I`m working on a battery operated tesla coil and im completely stumped on how to convert the dc to ac to power my hv transformer....
-
This 49-MHz FM transmitter consists of an audio amplifier, a low-pass filter, three RF stages, and a regulated-dc power supply. The output is about 16 mW into a 50- load. This transmitter can be used in many 49-MHz applications, such as in a baby monitor,....
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This is a HiFi pre-amplifiercircuit diagramwith low noise output. Very wide range frequency from about 10Hz until up to 100Khz will be gained by this preamplifier for maximumaudioperformance...
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The 200 MHz JFET has same features below: 1. Low crossmodulation 2. Large-signal handling ability 3. No neutralization 4. AGC controlled by biasiing the upper....
-
This circuit was described in a recent edition of an amateur radio magazine. It allows operation in the 160- to 190-kHz band with up to 1 W (license free) in any mode (CW/SSB/FM, etc.) It consists of a receiving converter for 5 kHz to 450 kHz and a....
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The circuit is drawn for measurement of acceleration from 1000 mg until + 1000 mg. It can be placed in kantra'n the car and be supplied from the sheath of electric lighter. The circuit includes one indicative LED and a screen LCD. The measurement of....
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This LAN tester circuit originally designed by Vassilis Stergiopoulos. This LAN tester circuit optionally has two designs. The first design is built based 2 main ICs that are timer IC555 and decade counter 4017. The second design is based microcontroller....
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Building a small circuit to turn on/off a 200W heater. I am using a MOC3023 and a BT136. At the datasheet of the the optotriac, this circuit is recommended: My question is how is the 180Ohm resistor value determined. I understand that it conducts for a very....
-
A simple RS232 example project that takes all the power it needs from the serial port. Use it to power your microcontroller and communicate between serial port and microcontroller. Takes advantage of the fact that pc serial ports will accept 0-5V rather than....
-
This article was originally published (in a slightly modified form) in the QST magazine, December 1998 and January 1999, and in the Radio Amateur`s Handbook, 1999. Visit the American Radio Relay League for information on these publications, and a world of....
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used for Fahrenheit measurements, in this case the freezing point is adjusted at 320F. At 2120F, P2 is adjusted to obtain 0.9V at output ....
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Discrete blinking LEDs are convenient, but the blink rate and blink duration are not configurable. I tried goofing around with using transistors, resistors, and capacitors to alter the blinking LED. In the end, I had so many extra electronic components that....
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-
A microphone amplifier that may be used with either Electret Condenser Microphone (ECM) inserts or dynamic inserts, made with discrete components. The preamplifier circuit is self stabilizing and will set its quiescent point at roughly half the supply....
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FIG IC, ICR, Ri, R ,. AN composition and bistable contact cast Ge circuit. ICc. lc world where;, c2, Dj New Zealand into one-shot delay circuit meaning: [CL. ICrr W well-linkin..
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You can use this circuit in most FM VHF receivers; the hookup is off the FM discriminator. Because every signal transmitted has its own deviation signature, this can be a red plusin hunting jammers ..
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This circuit (the Bucciarelli one) is designed to sense a sudden increase in light and does so extremely well. A few of these were actually built and tested and found to not trigger from normal room light. They sometimes malfunctioned if the phototransistors....
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The detector circuit shown in Figure 1 (1) is simple and works well, and as shown will not trigger with a 30V RMS signal at 5Hz, but operates in 60ms with 30V DC applied, and in 50mS with a 45V DC supply. This should be sufficient for most applications, and....
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Most small internal-combustion engines commonly used in the model-building world use glow plugs for starting. Unfortunately, glow plugs have an operating....
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This circuit prevents surges. From the opening is switched off or power failure. The damage to electrical appliances. The circuit will switch to use a short....
-
Capacitor step-down DC power supply circuit Shown is a capacitor step-down DC power supply circuit. This circuit eliminates the need for power transformers, capacitive voltage ..
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The DVM gives a direct indication of the temperature of the sensor in degrees Centigrade. The temperature sensor IC1 gives a nominal 1 µ per degree Kelvin which is converted to 10 mV per degree Kelvin by Rl and VR1. IC2 is a micropower, low input drift op....
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Generate the 10-Hz waveform that modulates the 3-kHz tone that is generated by U1C and D, Ql drives the transducer through a 8-Q:l-kS2 transformer. R4 might require slight changes (G‚ ±1 KOhm) to optimize sound intensity. Warning: Could cause hearing loss if....
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When you connect remote sensors to a central process controller, a simple, robust, and commonly used interface is the 4- to 20-mA loop. The advantages of this current loop include the simplicity of just two twisted wires that share both power and signal, the....
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Power Amplifier Speaker Protection Circuit Schematic While switching a power amplifier on, a loud thump sound is heard to sudden heavy discharge....
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This circuit was specifically designed to recharge alkaline cells. The unusual connection of the transistor in each charging unit will cause it to oscillate, on and off, thus transferring the charge accumulated in the capacitor to the cell. The orange LED....
-
Circuit from the AD596/597 form a temperature measurement and control instrument is shown in Fig. Here, AD596/597 (IC1) as a closed-loop thermocouple signal conditioner use. IC..
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This 80M receiver design includes the necessary switching to allow the SSB filter and first I. F. amplifier to be used for transmitting. The receiver stages from R. F. input to speaker output will be described in detail below. This type of band pass filter....
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Connect eight LEDs to an Arduino and make a Knight Rider display using only two Arduino pins in this tutorial. This is made possible by using a PCF8574 I/O expander IC....
-
his simple charger uses a single transistor as a constant current source. The voltage across the pair of 1N4148 diodes biases the base of the BD140 medium power transistor....
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The Infrared emitter detector circuit is very useful if you plan to make a line following robot, or a robot with basic object or obstacle detection. Infrared emitter detector pair sensors are fairly easy to implement, although involved some level of testing....
-
A universal rechargeable lithium battery circuit design, applicable to different battery types and number of batteries. This is because both the charger output voltage or curre..
-
This circuit is for the purpose of monitoring automotive lighting. Two special ICs are available from Telefunken that ar..
-
Here are some utility circuits for use with the Ramsey FM10a, and other small FM stereo transmitter kits. This information may be helpful for setting up a micro powered FM radio station. The FM10a and similar kits tend to put out a low quality, broad band....
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-
even if I didn`t read thoroughly nice one almost enough xformers , but certainly not enough shunt regs....
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This file contains information on tube transconductance. How it is computed and how it is used. It is one of the best descriptions around. It is simple and doesn`t get very deep into the math. It is an old 1940s Bell Labs document written by T. Slonczewski.....
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Is infrared emission circuit diagram. NE555 circuit generates a 40kHz pulse which is sent by the infrared emission control SE303 after beingamplified by VT. (b) is remote receiver and infrared dimming circuit composed of the KA2184. LS7232 is an integrated....
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Eight LED`s are used to indicate the pad currently selected. These LED`s are connected to a decade counter, which sequences the LED`s when it receives a clock pulse.Only one LED can be lit at a time from the decade counter, so although this circuit contains....
-
This is same circuit as above with the addition of a photo resistor to trigger the flip flop instead of a push button. The bias resistor in series with photo resistor was chosen so that sufficient voltage is present at the base of the 2N3904 to supply....
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As shown in the figure is the traditional three-phase bridge type inverter circuit:VT1?VT6 is thyristor, L1?L6 is commutation reactor, C1?C6 is commutating capacitor, the thyristor shut-off circuitconsists of the two parts. VD1?VD6 is feedback diode.....
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In the laser tube drive circuit are often provided with a photodiode, which generates a laser beam is proportional to the intensity (optical power) of the current, but in response to this type of photocell mostly relatively slow, generally can not track....
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As shown, the circuit will combine XTR101 with isolation amplifier ISO100 use, the 4 ~ 20mA current transformation and enlarged to + 1 ~ + 5v voltage output, while isolating th..
-
This simple circuit is a gain-of-1000 inverting amplifier. It will amplify submillivolt signals up to signal levels suitable for further processing. In almost all system applications, it is best to use as OUTPUT much gain as possible in the MAX420, thus....
-
-
Switching of feedback resistors for opamp driven by Radio Shack 276-115 selenium solar cell gives multirange linear light meter. With 1000-megohm resistor for highest sensitivity, star Sirius will produce pho-tocurrent of about 25 pA when aolar cell is....
-
Automatic cooler fan for amplifiers is a circuit introduced for the purpose of saving power in amplifier circuits. This circuit switches ON...
-
In some of the requirements and the current is not rectified voltage power supply circuit is not high, can be used to form a light emitting diode rectifier circuit,..
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his Electronic Lock circuit is not only simple but it is also very good. It can easily be configured to provide either momentary or continuous output. Key sequences of up to 9 digits are possible. You can pre-enter part of the combination and then have....
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Circuit shown in Figure 3-162. in graph. SBi is forward the start button, SBz to reverse the start button, SB3 for the stop button. Start switching resistance levels are contro..
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A diode, such as a IN4148, has a typical -2m V/C temperature coefficient at a 1 mA diode current. Ql and Q2 form a constant current source. D1 is the temperature sensor. ICl-a and -b are dc amplifiers, with ICl-c a temperature reference voltage supply.....
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How to drive an dot matrix led display. This project shows you how to drive one with 64 LEDs (8 rows by 8 columns) or less e.g. 35 LEDs (7 rows by 5 columns)....
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This circuit is similar to the ""Fading Red Eyes"" circuit (in the LED section) used to fade a pair of red LEDs. In this version, the lamps are faded by varying the duty cycle so that higher power incandescent lamps can be used without much power loss. The....
-
The Intelligent Fan Controller will control the speed of computer fans based on the temperature inside your computer and reduce the noise made by your computer Intelligent Fan Controller 4-wire 2-wire 3-wire speed computer pic microchip PIC18F2550 18F2550....
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This project implements a network connected water level sensor, measuring the level in the sump pit of my house. It`s connected to the home network and reports the water level by broadcasting UDP packets so that any computer can receive it and take action,....
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The following circuit shows about IR Remote Control Tester Circuit. Features: transistor T1 conducts during negative pulse period, data output pin ...
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// TDA2004 Car Battery 12W Stereo Amplifier Circuit Its main features are : Low distortion. Low noise. High reliability of the chip and of the...
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Car Burglar Alarm timer alarm system circuit, model to economize. This circuit convenients for to set up in an automobile. usually switch at set up keep with automobile door will the circuit closes. But in case of car owner opens in and out while note as a....
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My JD mower, for quite awhile now, has been very erratic at starting. Sometimes the starter will activate, but more often it will not. Yet after a long wait it will sometimes start. I found a tip on the internet, recommending puting a relay in the circuit.....
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It is important to layout your PCB correctly to allow trouble free In System Programming of AVR microcontrollers. This guide covers the usual problems that are encountered and typical AVR ISP circuit schematics. This guide covers Serial Programming, which is....
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An LCD -liquid crystal display is an electronically-modulated optical device made up of any number of pixels filled with liquid crystals and arrayed in front of a light source (backlight) or reflector to produce images in color or monochrome. The block....
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Interface the ds1820 to microcontroller. As you can see the first pin is connected to GND, the third pin is connected to VCC & the second pin is connected to the Microcontroller. So when the temperature is sensing, it give the sensor reading to controller.....
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The PIC16F870 keeps track of battery voltage as well as both charging and discharging currents. It also drives the 4 digit display, and switches the AC and load relays. The basic operation is as follows: While AC power is available, the battery voltage is....
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Hardware is located in a small box slipped in pants` pocket and the display is conceived in the following manner: the leftmost display D2 (the most significant digit) shows 0 to 9 Km. and its dot is always on to separate Km. from hm. The rightmost display D1....
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Here is simple sound sensor schematic, it`s use only one IC and and two transistor to drive the relay. this schematics can change the sensitivity using VR resistor also. I think this schematics is very usefull and can build anyone...
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This is a simple application of internal 10-bit ADC(analogto digital converter) of PIC16F676 microcontroller. you can use this circuit to measure up to 30 v dc. the possible applications are on bench top power supply or as a panel meter invarioussystem.....
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SuiperSpice`s philosophy is centered around the edit schematic, run simulation, view waveforms, probe signals, view waveforms, edit schematic cycle. All key issues have been automated. You can effortlessly modify the schematic, rerun and inspect new....
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Q1 and Q2, as well as T1, determine how much wattage the inverter can supply. With Q1, Q2=2N3055 and T1= 15 A, the inverter can supply about 300 watts. Larger transformers and more powerful transistors can be substituted for T1, Q1 and Q2 for more power. 2.....
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This circuit includes micro vibration sensor, trigger delay circuit and control circuit, the figure is as shown. The micro vibration sensor contains vibration sensor device and high power amplifier circuit, it can induce very weak external vibration signal,....
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Hi folks. I`m new to the forum and relatively new to diy electronics. My current project involves trying to make a battery-powered LED dimmer circuit. ....
Colour sensor is an interesting project for hobbyists. The cir- cuit can sense eight colours, i.e. blue, green and red (primary colours); magenta, yellow and cyan (secondary colours); and black and white. The circuit is based on the fundamentals of optics....
This is a very small telephone exchange attached only two ordinary Tele phones. Fully bi-directional facility with an intercom system. When a phone is in off hook condition , Exchange will detect it & send ringing pulse to other phone. When it will be picked....
The LM4610 uses DC? signal to control the tone (bass/treble), volume, and balance circuit.?? The advantages of using DC control is that you can use a mono...
Here s a design of signals logic tester that is using indicate on a common cathode seven-segment display, if entry is at logic level ""1"" (one H on the display) or logic level (one L on the display). If an undefined level is detected will display ....
The Nutchip decodes the signal, differentiating between immediate and delayed sensors (aside from true remote control signals used for switching the circuit on and off). As for all radio-based designs, always remember that a good radio receiver cannot....
Amplifiers which run from 12V DC generally don t put out much power and they are usually not hifi as well. But this little stereo amplifier ticks the powe....
This UHF wideband amplifier(Ultra High Frequency amplifier) has a total gain of 10 to 15 dB in the 400 850 MHz domain frequency so it can be used where the tv signal is weak. For this UHF antenna tv amplifier to work correctly you need to cut the components....
The circuit protects a solid-state relay from overloads. The circuit limits current, automatically disconnects the load after ..
The LTC®4010 and LTC4011 are NiCd/NiMH battery chargers that simplify Nickel-based battery charger design and include power control and charge termination for fast charging up to 16 series-connected cells using a synchronous buck topology. The LTC4011....
A power filter is a device you put ahead of something like a GPS and MP3 player and or radar detector that you have run into the Aux Circuit. But these things used properly and properly installed will take the modulator noise out of any system. If you were....
This is transmitters circuit that can transmit both FM and AM signal simultaneously at two different frequencies FM in 100Mhz and Am in 20 MHz. Here is the ....
The STI7167 uses state-of-the-art process technology to provide a fully featured HD AVC DVB-C and DVB-T Demodulator and decoder IC. It is a highly integrated system-on-chip suitable for STB markets across cable, terrestrial, and terrestrial/IP hybrid....
An alternative to the infamous ROG `s Ruby amp. As you see it shares with the Ruby the same topology: a buffer and a chip amp. It uses a JFET buffer with a MPF102 and the 1W TDA7052 chip. It is a clean amp and it reacts very well with any pedal in front of....
This transmitter is basic but allows transmission of audio to an AM radio. It consists of an RF oscillator operating in the AM broadcast band, together with a modulator stage, which mixes the incoming audio and the RF ..
U1A, an op amp, oscillates at the frequency at which the phase shift in the Wien bridge network is exactly zero degrees. Changing bridge component values changes the oscillator frequency. In this circuit, we need change only the two resistors to do this. S1A....
Parts List The circuit consists of preamplifier, tone controls, and regulated DC power supply, while providing a power output of 18 Watts for 8 Ohm load a....
Use this circuit for checking fundamental oscillates, Q2 conducts and the LED lights. A3 HF crystals on a "Go-No-Go" basis. An untuned or 6V, 40mA bulb could be substituted for the Colpitts oscillator drives a voltage multiplier LED..
I`m working on a battery operated tesla coil and im completely stumped on how to convert the dc to ac to power my hv transformer....
This 49-MHz FM transmitter consists of an audio amplifier, a low-pass filter, three RF stages, and a regulated-dc power supply. The output is about 16 mW into a 50- load. This transmitter can be used in many 49-MHz applications, such as in a baby monitor,....
This is a HiFi pre-amplifiercircuit diagramwith low noise output. Very wide range frequency from about 10Hz until up to 100Khz will be gained by this preamplifier for maximumaudioperformance...
The 200 MHz JFET has same features below: 1. Low crossmodulation 2. Large-signal handling ability 3. No neutralization 4. AGC controlled by biasiing the upper....
This circuit was described in a recent edition of an amateur radio magazine. It allows operation in the 160- to 190-kHz band with up to 1 W (license free) in any mode (CW/SSB/FM, etc.) It consists of a receiving converter for 5 kHz to 450 kHz and a....
The circuit is drawn for measurement of acceleration from 1000 mg until + 1000 mg. It can be placed in kantra'n the car and be supplied from the sheath of electric lighter. The circuit includes one indicative LED and a screen LCD. The measurement of....
This LAN tester circuit originally designed by Vassilis Stergiopoulos. This LAN tester circuit optionally has two designs. The first design is built based 2 main ICs that are timer IC555 and decade counter 4017. The second design is based microcontroller....
Building a small circuit to turn on/off a 200W heater. I am using a MOC3023 and a BT136. At the datasheet of the the optotriac, this circuit is recommended: My question is how is the 180Ohm resistor value determined. I understand that it conducts for a very....
A simple RS232 example project that takes all the power it needs from the serial port. Use it to power your microcontroller and communicate between serial port and microcontroller. Takes advantage of the fact that pc serial ports will accept 0-5V rather than....
This article was originally published (in a slightly modified form) in the QST magazine, December 1998 and January 1999, and in the Radio Amateur`s Handbook, 1999. Visit the American Radio Relay League for information on these publications, and a world of....
used for Fahrenheit measurements, in this case the freezing point is adjusted at 320F. At 2120F, P2 is adjusted to obtain 0.9V at output ....
Discrete blinking LEDs are convenient, but the blink rate and blink duration are not configurable. I tried goofing around with using transistors, resistors, and capacitors to alter the blinking LED. In the end, I had so many extra electronic components that....
A microphone amplifier that may be used with either Electret Condenser Microphone (ECM) inserts or dynamic inserts, made with discrete components. The preamplifier circuit is self stabilizing and will set its quiescent point at roughly half the supply....
FIG IC, ICR, Ri, R ,. AN composition and bistable contact cast Ge circuit. ICc. lc world where;, c2, Dj New Zealand into one-shot delay circuit meaning: [CL. ICrr W well-linkin..
You can use this circuit in most FM VHF receivers; the hookup is off the FM discriminator. Because every signal transmitted has its own deviation signature, this can be a red plusin hunting jammers ..
The detector circuit shown in Figure 1 (1) is simple and works well, and as shown will not trigger with a 30V RMS signal at 5Hz, but operates in 60ms with 30V DC applied, and in 50mS with a 45V DC supply. This should be sufficient for most applications, and....
Most small internal-combustion engines commonly used in the model-building world use glow plugs for starting. Unfortunately, glow plugs have an operating....
This circuit prevents surges. From the opening is switched off or power failure. The damage to electrical appliances. The circuit will switch to use a short....
Capacitor step-down DC power supply circuit Shown is a capacitor step-down DC power supply circuit. This circuit eliminates the need for power transformers, capacitive voltage ..
The DVM gives a direct indication of the temperature of the sensor in degrees Centigrade. The temperature sensor IC1 gives a nominal 1 µ per degree Kelvin which is converted to 10 mV per degree Kelvin by Rl and VR1. IC2 is a micropower, low input drift op....
Generate the 10-Hz waveform that modulates the 3-kHz tone that is generated by U1C and D, Ql drives the transducer through a 8-Q:l-kS2 transformer. R4 might require slight changes (G‚ ±1 KOhm) to optimize sound intensity. Warning: Could cause hearing loss if....
Power Amplifier Speaker Protection Circuit Schematic While switching a power amplifier on, a loud thump sound is heard to sudden heavy discharge....
This circuit was specifically designed to recharge alkaline cells. The unusual connection of the transistor in each charging unit will cause it to oscillate, on and off, thus transferring the charge accumulated in the capacitor to the cell. The orange LED....
Circuit from the AD596/597 form a temperature measurement and control instrument is shown in Fig. Here, AD596/597 (IC1) as a closed-loop thermocouple signal conditioner use. IC..
This 80M receiver design includes the necessary switching to allow the SSB filter and first I. F. amplifier to be used for transmitting. The receiver stages from R. F. input to speaker output will be described in detail below. This type of band pass filter....
Connect eight LEDs to an Arduino and make a Knight Rider display using only two Arduino pins in this tutorial. This is made possible by using a PCF8574 I/O expander IC....
his simple charger uses a single transistor as a constant current source. The voltage across the pair of 1N4148 diodes biases the base of the BD140 medium power transistor....
The Infrared emitter detector circuit is very useful if you plan to make a line following robot, or a robot with basic object or obstacle detection. Infrared emitter detector pair sensors are fairly easy to implement, although involved some level of testing....
A universal rechargeable lithium battery circuit design, applicable to different battery types and number of batteries. This is because both the charger output voltage or curre..
This circuit is for the purpose of monitoring automotive lighting. Two special ICs are available from Telefunken that ar..
Here are some utility circuits for use with the Ramsey FM10a, and other small FM stereo transmitter kits. This information may be helpful for setting up a micro powered FM radio station. The FM10a and similar kits tend to put out a low quality, broad band....
even if I didn`t read thoroughly nice one almost enough xformers , but certainly not enough shunt regs....
This file contains information on tube transconductance. How it is computed and how it is used. It is one of the best descriptions around. It is simple and doesn`t get very deep into the math. It is an old 1940s Bell Labs document written by T. Slonczewski.....
Is infrared emission circuit diagram. NE555 circuit generates a 40kHz pulse which is sent by the infrared emission control SE303 after beingamplified by VT. (b) is remote receiver and infrared dimming circuit composed of the KA2184. LS7232 is an integrated....
Eight LED`s are used to indicate the pad currently selected. These LED`s are connected to a decade counter, which sequences the LED`s when it receives a clock pulse.Only one LED can be lit at a time from the decade counter, so although this circuit contains....
This is same circuit as above with the addition of a photo resistor to trigger the flip flop instead of a push button. The bias resistor in series with photo resistor was chosen so that sufficient voltage is present at the base of the 2N3904 to supply....
As shown in the figure is the traditional three-phase bridge type inverter circuit:VT1?VT6 is thyristor, L1?L6 is commutation reactor, C1?C6 is commutating capacitor, the thyristor shut-off circuitconsists of the two parts. VD1?VD6 is feedback diode.....
In the laser tube drive circuit are often provided with a photodiode, which generates a laser beam is proportional to the intensity (optical power) of the current, but in response to this type of photocell mostly relatively slow, generally can not track....
As shown, the circuit will combine XTR101 with isolation amplifier ISO100 use, the 4 ~ 20mA current transformation and enlarged to + 1 ~ + 5v voltage output, while isolating th..
This simple circuit is a gain-of-1000 inverting amplifier. It will amplify submillivolt signals up to signal levels suitable for further processing. In almost all system applications, it is best to use as OUTPUT much gain as possible in the MAX420, thus....
Switching of feedback resistors for opamp driven by Radio Shack 276-115 selenium solar cell gives multirange linear light meter. With 1000-megohm resistor for highest sensitivity, star Sirius will produce pho-tocurrent of about 25 pA when aolar cell is....
Automatic cooler fan for amplifiers is a circuit introduced for the purpose of saving power in amplifier circuits. This circuit switches ON...
In some of the requirements and the current is not rectified voltage power supply circuit is not high, can be used to form a light emitting diode rectifier circuit,..
his Electronic Lock circuit is not only simple but it is also very good. It can easily be configured to provide either momentary or continuous output. Key sequences of up to 9 digits are possible. You can pre-enter part of the combination and then have....
Circuit shown in Figure 3-162. in graph. SBi is forward the start button, SBz to reverse the start button, SB3 for the stop button. Start switching resistance levels are contro..
A diode, such as a IN4148, has a typical -2m V/C temperature coefficient at a 1 mA diode current. Ql and Q2 form a constant current source. D1 is the temperature sensor. ICl-a and -b are dc amplifiers, with ICl-c a temperature reference voltage supply.....
How to drive an dot matrix led display. This project shows you how to drive one with 64 LEDs (8 rows by 8 columns) or less e.g. 35 LEDs (7 rows by 5 columns)....
This circuit is similar to the ""Fading Red Eyes"" circuit (in the LED section) used to fade a pair of red LEDs. In this version, the lamps are faded by varying the duty cycle so that higher power incandescent lamps can be used without much power loss. The....
The Intelligent Fan Controller will control the speed of computer fans based on the temperature inside your computer and reduce the noise made by your computer Intelligent Fan Controller 4-wire 2-wire 3-wire speed computer pic microchip PIC18F2550 18F2550....
This project implements a network connected water level sensor, measuring the level in the sump pit of my house. It`s connected to the home network and reports the water level by broadcasting UDP packets so that any computer can receive it and take action,....
The following circuit shows about IR Remote Control Tester Circuit. Features: transistor T1 conducts during negative pulse period, data output pin ...
// TDA2004 Car Battery 12W Stereo Amplifier Circuit Its main features are : Low distortion. Low noise. High reliability of the chip and of the...
Car Burglar Alarm timer alarm system circuit, model to economize. This circuit convenients for to set up in an automobile. usually switch at set up keep with automobile door will the circuit closes. But in case of car owner opens in and out while note as a....
My JD mower, for quite awhile now, has been very erratic at starting. Sometimes the starter will activate, but more often it will not. Yet after a long wait it will sometimes start. I found a tip on the internet, recommending puting a relay in the circuit.....
It is important to layout your PCB correctly to allow trouble free In System Programming of AVR microcontrollers. This guide covers the usual problems that are encountered and typical AVR ISP circuit schematics. This guide covers Serial Programming, which is....
An LCD -liquid crystal display is an electronically-modulated optical device made up of any number of pixels filled with liquid crystals and arrayed in front of a light source (backlight) or reflector to produce images in color or monochrome. The block....
Interface the ds1820 to microcontroller. As you can see the first pin is connected to GND, the third pin is connected to VCC & the second pin is connected to the Microcontroller. So when the temperature is sensing, it give the sensor reading to controller.....
The PIC16F870 keeps track of battery voltage as well as both charging and discharging currents. It also drives the 4 digit display, and switches the AC and load relays. The basic operation is as follows: While AC power is available, the battery voltage is....
Hardware is located in a small box slipped in pants` pocket and the display is conceived in the following manner: the leftmost display D2 (the most significant digit) shows 0 to 9 Km. and its dot is always on to separate Km. from hm. The rightmost display D1....
Here is simple sound sensor schematic, it`s use only one IC and and two transistor to drive the relay. this schematics can change the sensitivity using VR resistor also. I think this schematics is very usefull and can build anyone...
This is a simple application of internal 10-bit ADC(analogto digital converter) of PIC16F676 microcontroller. you can use this circuit to measure up to 30 v dc. the possible applications are on bench top power supply or as a panel meter invarioussystem.....
SuiperSpice`s philosophy is centered around the edit schematic, run simulation, view waveforms, probe signals, view waveforms, edit schematic cycle. All key issues have been automated. You can effortlessly modify the schematic, rerun and inspect new....
Q1 and Q2, as well as T1, determine how much wattage the inverter can supply. With Q1, Q2=2N3055 and T1= 15 A, the inverter can supply about 300 watts. Larger transformers and more powerful transistors can be substituted for T1, Q1 and Q2 for more power. 2.....
This circuit includes micro vibration sensor, trigger delay circuit and control circuit, the figure is as shown. The micro vibration sensor contains vibration sensor device and high power amplifier circuit, it can induce very weak external vibration signal,....
