New Circuits Page 190
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This timer will provide a sequence of up to ten separate events. The length of each event is set independently. And the sequence will run a fixed number of times - or repeat continuosly. The individual events within the sequence - can be made to repeat....
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-
The following circuit shows about Three Phase Auto Changer Circuit Diagram. This circuit using the 2N2222 Transistor. Features: transformer with ....
-
-
Once packet radio started taking off, the limitations of my first foray into AX25 with the "BSX1" TNC became evident. It supported AX25 version 1 only and was limited in its IO capabilities. The command set was also "non standard" due to the almost universal....
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-
-
-
Fluorescent tube is connected in the LC resonant circuit composed of L2 and C9. Bidirectional breakdown diode VD4 is starting circuit. When AC power is connected, VT2 gate potential increases by VD4; when the voltage exceeds the gate threshold voltage, VT2....
-
The 555 circuit below is a flashing bicycle light powered with four C,D or AA cells (6 volts). Two sets of 20 LEDs will alternately flash at approximately 4.7 cycles per second using RC values shown (4.7K for R1, 150K for R2 and a 1uF capacitor). Time....
-
To reach low channel ON resistance (<30 Ohm) and low OFF current leakage, 4-channel commutator uses the 2N4091. The DM7800 voltage translator is a monolithic device. This device give us 10V to -20V gate drive to the JFETs while at the same time giving....
-
One of the simplest ways to make a battery powered High Voltage power supply is to use a common car ignition coil. Ignition coils are a type of induction transformer based on the Tesla Coil invented by Nikola Tesla in 1891. The voltage rise is not given by....
-
Hey guys I`ve been researching a ""mystery circuit"" and I can`t figure out what its name is. It`s driving me crazy!!!! Please HELP ME!!! Thanx....
-
-
-
-
The TDA1519 circuit can deliver 2x6 watts output power. TDA1519 is an integrated class-B dual output amplifier in a 9-lead single in-line (SIL) plastic medium power package is primarily developed for car radio applications. ..
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As can be seen in the first diagram below, the configuration is a simple mosfet based designed for amplifying current at +/-60 volts such that the connected transformer corresponds to generate the required 1kva output. Q1, Q2 forms the initial differential....
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This is my first successful vacuum tube project. The output of this small amplifier in which a 6V6GT output pentode is connected as triode is about 4. 5 watts. This project involves a single ended audio amplifier, which consists of a resistive input network,....
-
For the other components you should have most of the stuff lying around if you have doneany type of electronics except for the programmer, RS232 chip and PIC. For getting information out of the project and into the PC a USB to RS232 is needed and this can....
-
-
The motorcycle anti-theft alarm which uses the 555 time-base integrated circuit is introduced in this article, and it can send out the alarm when the thief is moving the motorcycle vertically. The principle of the circuit The motorcycle anti-theft alarm....
-
This key code switch circuit is a type of electronic circuit that is created to replace conventional normal key switch. Without inserts a keys. But you can....
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The logic power and CAN signals come in from N4 pins 3 through 8. The CAN signals are connected to the MCP2551 CAN physical layer IC, U5. The transmit and receive pins of the microctroller, (U4 pins 5 and 6) are connected to the other side of U5. Lastly, the....
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I am presenting you a simple smoke sensing alarm circuit using 555 timer. By using this circuit you can detect smoke and it alarms when the air is contaminated. Let me introduce you the components used in it. This smoke detecting alarm is based directly on....
-
-
555 Timers are very fun to encounter and experiment with. They can be used as a timer and can be set to a certain frequency. In Part II of Electronic Project I, we created a circuit that would get an LED to flash. This time we are going to add a speaker so....
-
-
The 40W Amp OCL 2N3055+MJ2955 is easy to build,and very inexpensive. To use Power Supply +35V -35V 2A. Transistor 2N3055+MJ2955 must be mounted on heatsink. Can....
-
The "green area" is where should be placed the TRF7970A `s antenna (Between 0 ohm resistors, the antenna should be connected). TRF7970A `s antenna can be done step by step according to the document "Antenna Matching for the TRF7960 RFID Reader (SLOA135) ".....
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The loop can be any type of hookup wire, with a maximum resistance of about 90K. Using very thin wire (40AWG, for example) will make a very sensitive trip wire, but will shorten the distance it can be strung due to the high resistance...
-
The? following circuit shows about AC Motor Speed Controller Kit - K2636 Circuit Diagram. Features: normal dimmers the kit performs, with carbon ...
-
his remote transmits a tone using an infa-red LED. This tone is decoded by the receiver. Since the receiver only switches when it ""hears"" the tone, there are no accidental activations....
-
Hi Sluts! long time lurker here, a while ago i bought 4 of those old amps for the case, and with my limited knowledge of old equipement, i never realy....
-
Schematic and description of a simple mic amplifier circuit. This circuit contains two stages first microphone preamplifier and second audio amplifier using LM386 Amplifier IC....
-
The electric fan of remote control is to do a large amount of research and development and production in Pearl River Delta area of Guangdong in initial stage of the 1990s, and there is specialized mask chip that serves as top management chip, I have done the....
-
This is a complete design circuit for a complete ultrasonic transceiver used in a variety of pulse/echo-ranging applications. Here`s the figure of the circuit; In this circuit, the LM1812 transmits a burst of oscillations with transducer X1. Then, using the....
-
Digital clock project based on the PIC16C54 microcontroller can be designed using the following circuit diagram. This digital clock electronic project based on the PIC16C54 is a simple time-of-day clock incorporating four seven-segment LED displays and three....
-
These circuits are similar to that of Fig. 5-47, except that the circuits provide for FM or sweep modulation. Use circuit 5-50A for FM (small deviations, about ±10%). Use circuit 5-50B for a sweep range of 1000:1. As a guideline, the sweep frequency....
-
The SP1481E SP1485E and SP1490E 1491E series transceivers with SP6652 high efficiency high frequency current mode PWM buck Regulator together allow creating an isolated RS-485 Interface with up to 2kVrms isolation and CAN support up to 15Mbps data rate....
-
This experiment has two main objectives. First, we will become familiar with the characteristics of the Geiger-MG ller (GM) tube, including the properties of threshold, starting and operating voltages, GM plateau region and plateau slope. Then we will use....
-
Optoreflector sensors contain a matched infrared transmitter (LED) and infrared receiver (usually a phototransistor ) pair. These devices work by measuring the amount of light that is reflected into the receiver. Because the receiver also responds to ambient....
-
This is a design circuit for simple function generator. Built around a single 8038 waveform generator IC, this circuit produces sine, square or triangle waves from 20Hz to 200kHz in four switched ranges. There are both high and low level outputs whic ....
-
-
Used several KE 4-211-2 Sennheiser microphones to assemble a device for acoustic signal analysis. They are connected to a National Instruments data acquisition device with ~1 m long cable and sampling rate is set to 50kHz. I`ve added a resistor and a....
-
-
Short circuits in the tracks, points or wiring are almost inevitable when building or operating a model railway. Although transformers for model systems must be protected against short circuits by built-in bimetallic switches, the response time of such....
-
Connected to a burglar alarm or fire alarm in the event of making phone calls playing voice messages. Controlled via DTMF actuators can operate on the spot. In recent years we have introduced several telecontrols based on the SIM900 GSM module. We released....
-
The ADI Company one ADM1066 is it monitor one piece powers many kinds of of configurated /sequence device, and last 12 ADC and 6 8 DAC of voltage output, all voltage is superior to 0. 5% in the precision of 25 degrees of C, is mainly used in the office....
-
-
-
Maxim now has available a series of five integrated oscillator building blocks in the MAX260x series which cover the frequency range between 45 and 650 MHz. The MAX2606 covers the VHF band, although the frequency can only be varied by approximately ±3 MHz....
-
-
-
Description: LM35 IC Thermal Control Circuit Diagram. Features: LM35DZ detect when the temperature is higher than the preset level, can be used in ....
-
I found this circuit really simple and interesting. It is really simple to drive Nokia 3310 graphical LCD by using simple LPT cable and some PC software. Firs of all connect graphical LCD to LPT port according to following circuit: Graphical display needs....
-
Designing an IR demodulator circuit to replace the one shown in this question. Basically I want to demodulate a simple IR signal modulated at 32. 678 kHz. I just need to know if the signal is present. No packets. Just IR present or not present. I have tried....
-
-
-
-
This alarm siren circuit give continuous frequency sweep, a warbling sound. The warbling period is about 6 seconds, 3 seconds for frequency sweeping up and 3....
-
The circuit diagram shows two LT1398`s from Linear Technology used to create buffered color-difference signals from RGB (red-green-blue) inputs. In this application, the R input arrives via 75 coax. It is routed to the non-inverting input of amplifier IC1a....
-
-
The Finder is a prototype of that device. It is a keychain-sized GPS device with two buttons, Save and Find. Pressing Save records your current location. Pressing Find visually leads you back to the saved location. Up to 9 locations can be saved. Press the....
-
The circuit below was developed to guard the fish pond. In this case to prevent that the pump sucks just air when the waterlevel get below the pump. When the waterfilters get saturated and dirty, the water level behind the filter gets to an unacceptable....
-
Electronics Tutorial about the RC Oscillator Circuit, RC Phase Shift Oscillators and how a Tuned RC Oscillator Circuit produces sine waves....
-
TDA2030 is a circuit integrated monolithic in Pentawat ® package, to be used as class audio amplifier AB. Typically he supplies up to 14 Watts of potency (d=0. 5%) @ 14V/4 ©. The guaranteed potency is 12W in a load of 4 © and 8 watts in a load of 8 ©.....
-
-
-
The control module monitors the fuel tank pressure (FTP) sensor signal in order to detect vacuum decay and excess vacuum during the enhanced evaporative emission (EVAP) diagnostic. The Fuel Tank Pressure Sensor responds to changes in the fuel tank pressure....
-
The best-known ways to transmit a digital audio signal (S/PDIF) are to use a standard 75? coaxial cable or Toslink optical modules with matching optical c....
-
This simple pulse width modulation DC motor control eliminates these problems. It controls the motor speed by driving the motor with short pulses. Thesepulses vary in duration to change the speed of the motor. The longer the pulses, the faster the motor....
-
-
This is a very simple 555 timer circuit,It make a simple theft detterant which may be just as effective. The idea is to have a flashing red led indicate that your car is protected. This device can protect your vehicle from potential thieves....
-
This is a circuit of 90-125 MHz Crystal which is very useful for VHF/UHF converters. This circuit provide 5 to 15 mW output. High-quality fifth- or seventh-over-tone crystal type can be used in this circuit. Undesired oscillation never reach above 500 MHz....
-
The Bio-Stimulator provides muscles` stimulation and invigoration but, mainly, it`s an aid in removing cellulitis. Tape the electrodes to the skin at both ends of the chosen muscle and rotate P1 knob slowly until a light itch sensation is perceived. Each....
-
This small water sensor alarm circuit makes a loud warning sound when a humidity sensor detects a quantity of water. This circuit assembly is an application of low power comparator LM1801 made by National Semiconductor. The reference voltage for the....
-
Two KOSS A-1220 headphone amps. Each share the same model number, yet have completely different internals: One uses just a single 12AU7, while the other has a 12AT7 and a pair of 6AQ5A`s. I have searched the forums and found one or two threads about this....
-
-
This is a low cost circuit diagram for the emergency light based on white LED. Component: LM317 IC, Resistor, Transformer, LED, Variable ....
-
-
This lovely circuit is a real gem! Easy to assemble and more sensitive than many commercial devices available. It`s based around an LF351 low-noise operational amplifier and a 1mF choke acting as the sensor. Unlike most other simple EMF detectors, this one....
-
The chicken male and female discriminator circuit is composed of the audio detection circuit, active band-pass filter and LED display circuit, and it is shown in Figure 4-11. Audio detection circuit consists of piezoelectric ceramic BC and resistor Rl, R2.....
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-
The following describes the design, construction, operation and use of the DECUS divider module. Photo 2 shows a top view of the module and Photo 3 shows the bottom. The primary use of the module is to condition the 10 megahertz (MHz) signal from a rubidium....
-
This FETVM replaces the function of the VTVM while at the same time ridding the in-strument of the usual line cord. In addition, drift rates are far superior to vacuum tube circuits allowing a 0. 5 volt full scale range which is impractical with most vacuum....
-
For this special Halloween project we built a spooky candy bowl that lights up when an unsuspecting trick-or-treater reaches in. While devices like these do exist, many of them use complicated proximity sensors to spring their trap. Here at NerdKits we enjoy....
-
The following circuit shows about servo motor driver. This circuit based on the 12F675 IC. Features: Timer 0 timing, single control line from ....
-
This circuit senses AC audio voltage supplied to the car-radio loudspeakers and displays it as power using a LED bar graph, achieving at the same time an attractive visual effect. It is designed to cover common car-radio output power ranges, but can easily....
-
A simple metal detector circuit diagram and schematic using a single transistor and a radio. This metal detector/sensor project is easy to make and is an application of Colpitts oscillator....
-
The ISL6308A is a three-phase PWM control IC with integrated MOSFET drivers. It provides a precision voltage regulation system for multiple applications including, but not limited to, high current low voltage point-of-load converters, embedded applications....
-
-
Developers of human-computer interface technologies have recently been focusing on the use of bio-electrical signals (eye movement, electrical activity of muscles and brain) as inputs to control devices in order to increase the capacity of signal processing....
-
1. Driver: L298N Dual H Bridge DC Motor Driver IC 2. Driven part of the terminal supply area Vs: +5 V ~ +35 V; such as the need to take power within the board, the supply area Vs: +7 V ~ +35 V 3. Driven part of the peak current Io: 2A 4. The logical part of....
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-
-
Electronic Combination Lock. This circuit is very basic to build. To open a the lock which is connected to the K1 Load you must press each momentary switch in the correct sequence. The...
-
This circuit consists of a single transistor as amplifier and it gives a nice amplification to weakest and unipolar signals for feeding to a real amplifier. Don`t post your email or phone number in the comment box. Only put email address in the email field.....
-
Digital ICs and opto-isolators provide the drive for this TMOS servo amplifier, resulting in fewer analog circuits and less drift. Fast and consistent turn-on and turn-off characteristics also enable accurate analog output results directly from the digital....
-
2001 chevy s10 headlights some times work some times dont along with dash indicator light. all other lights work fine. I have changed headlight switch, fuse, relay. checked headlight bulbs. all wires to bulbs are possitive. Yes, I took test lamp and hooked....
-
This circuit is used in computer RS-232 serial interface and current loop circuit interface, it can transform voltage singal into 20mA current singal, the maximum transmission rate is 1200 bits. CCD IC1, T1 form receiver interface circuit, T2, T3 constitute....
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It can be adjusted to give the desired speed for the display. The output of the 555 is directly connected to the input of a CD 4017. The input of the counter is called the CLOCK line (555). The 10 outputs become active, one at a time, on the rising edge of....
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The circuit starts timing when switched on. The green LED lights to show that timing is in progress. When the time period is over the green LED turns off, the red LED turns on and the bleeper sounds. The time period is set by adjusting the variable resistor.....
This timer will provide a sequence of up to ten separate events. The length of each event is set independently. And the sequence will run a fixed number of times - or repeat continuosly. The individual events within the sequence - can be made to repeat....
The following circuit shows about Three Phase Auto Changer Circuit Diagram. This circuit using the 2N2222 Transistor. Features: transformer with ....
Once packet radio started taking off, the limitations of my first foray into AX25 with the "BSX1" TNC became evident. It supported AX25 version 1 only and was limited in its IO capabilities. The command set was also "non standard" due to the almost universal....
Fluorescent tube is connected in the LC resonant circuit composed of L2 and C9. Bidirectional breakdown diode VD4 is starting circuit. When AC power is connected, VT2 gate potential increases by VD4; when the voltage exceeds the gate threshold voltage, VT2....
The 555 circuit below is a flashing bicycle light powered with four C,D or AA cells (6 volts). Two sets of 20 LEDs will alternately flash at approximately 4.7 cycles per second using RC values shown (4.7K for R1, 150K for R2 and a 1uF capacitor). Time....
To reach low channel ON resistance (<30 Ohm) and low OFF current leakage, 4-channel commutator uses the 2N4091. The DM7800 voltage translator is a monolithic device. This device give us 10V to -20V gate drive to the JFETs while at the same time giving....
One of the simplest ways to make a battery powered High Voltage power supply is to use a common car ignition coil. Ignition coils are a type of induction transformer based on the Tesla Coil invented by Nikola Tesla in 1891. The voltage rise is not given by....
Hey guys I`ve been researching a ""mystery circuit"" and I can`t figure out what its name is. It`s driving me crazy!!!! Please HELP ME!!! Thanx....
The TDA1519 circuit can deliver 2x6 watts output power. TDA1519 is an integrated class-B dual output amplifier in a 9-lead single in-line (SIL) plastic medium power package is primarily developed for car radio applications. ..
As can be seen in the first diagram below, the configuration is a simple mosfet based designed for amplifying current at +/-60 volts such that the connected transformer corresponds to generate the required 1kva output. Q1, Q2 forms the initial differential....
This is my first successful vacuum tube project. The output of this small amplifier in which a 6V6GT output pentode is connected as triode is about 4. 5 watts. This project involves a single ended audio amplifier, which consists of a resistive input network,....
For the other components you should have most of the stuff lying around if you have doneany type of electronics except for the programmer, RS232 chip and PIC. For getting information out of the project and into the PC a USB to RS232 is needed and this can....
The motorcycle anti-theft alarm which uses the 555 time-base integrated circuit is introduced in this article, and it can send out the alarm when the thief is moving the motorcycle vertically. The principle of the circuit The motorcycle anti-theft alarm....
This key code switch circuit is a type of electronic circuit that is created to replace conventional normal key switch. Without inserts a keys. But you can....
The logic power and CAN signals come in from N4 pins 3 through 8. The CAN signals are connected to the MCP2551 CAN physical layer IC, U5. The transmit and receive pins of the microctroller, (U4 pins 5 and 6) are connected to the other side of U5. Lastly, the....
I am presenting you a simple smoke sensing alarm circuit using 555 timer. By using this circuit you can detect smoke and it alarms when the air is contaminated. Let me introduce you the components used in it. This smoke detecting alarm is based directly on....
555 Timers are very fun to encounter and experiment with. They can be used as a timer and can be set to a certain frequency. In Part II of Electronic Project I, we created a circuit that would get an LED to flash. This time we are going to add a speaker so....
The 40W Amp OCL 2N3055+MJ2955 is easy to build,and very inexpensive. To use Power Supply +35V -35V 2A. Transistor 2N3055+MJ2955 must be mounted on heatsink. Can....
The "green area" is where should be placed the TRF7970A `s antenna (Between 0 ohm resistors, the antenna should be connected). TRF7970A `s antenna can be done step by step according to the document "Antenna Matching for the TRF7960 RFID Reader (SLOA135) ".....
The loop can be any type of hookup wire, with a maximum resistance of about 90K. Using very thin wire (40AWG, for example) will make a very sensitive trip wire, but will shorten the distance it can be strung due to the high resistance...
The? following circuit shows about AC Motor Speed Controller Kit - K2636 Circuit Diagram. Features: normal dimmers the kit performs, with carbon ...
his remote transmits a tone using an infa-red LED. This tone is decoded by the receiver. Since the receiver only switches when it ""hears"" the tone, there are no accidental activations....
Hi Sluts! long time lurker here, a while ago i bought 4 of those old amps for the case, and with my limited knowledge of old equipement, i never realy....
Schematic and description of a simple mic amplifier circuit. This circuit contains two stages first microphone preamplifier and second audio amplifier using LM386 Amplifier IC....
The electric fan of remote control is to do a large amount of research and development and production in Pearl River Delta area of Guangdong in initial stage of the 1990s, and there is specialized mask chip that serves as top management chip, I have done the....
This is a complete design circuit for a complete ultrasonic transceiver used in a variety of pulse/echo-ranging applications. Here`s the figure of the circuit; In this circuit, the LM1812 transmits a burst of oscillations with transducer X1. Then, using the....
Digital clock project based on the PIC16C54 microcontroller can be designed using the following circuit diagram. This digital clock electronic project based on the PIC16C54 is a simple time-of-day clock incorporating four seven-segment LED displays and three....
These circuits are similar to that of Fig. 5-47, except that the circuits provide for FM or sweep modulation. Use circuit 5-50A for FM (small deviations, about ±10%). Use circuit 5-50B for a sweep range of 1000:1. As a guideline, the sweep frequency....
The SP1481E SP1485E and SP1490E 1491E series transceivers with SP6652 high efficiency high frequency current mode PWM buck Regulator together allow creating an isolated RS-485 Interface with up to 2kVrms isolation and CAN support up to 15Mbps data rate....
This experiment has two main objectives. First, we will become familiar with the characteristics of the Geiger-MG ller (GM) tube, including the properties of threshold, starting and operating voltages, GM plateau region and plateau slope. Then we will use....
Optoreflector sensors contain a matched infrared transmitter (LED) and infrared receiver (usually a phototransistor ) pair. These devices work by measuring the amount of light that is reflected into the receiver. Because the receiver also responds to ambient....
This is a design circuit for simple function generator. Built around a single 8038 waveform generator IC, this circuit produces sine, square or triangle waves from 20Hz to 200kHz in four switched ranges. There are both high and low level outputs whic ....
Used several KE 4-211-2 Sennheiser microphones to assemble a device for acoustic signal analysis. They are connected to a National Instruments data acquisition device with ~1 m long cable and sampling rate is set to 50kHz. I`ve added a resistor and a....
Short circuits in the tracks, points or wiring are almost inevitable when building or operating a model railway. Although transformers for model systems must be protected against short circuits by built-in bimetallic switches, the response time of such....
Connected to a burglar alarm or fire alarm in the event of making phone calls playing voice messages. Controlled via DTMF actuators can operate on the spot. In recent years we have introduced several telecontrols based on the SIM900 GSM module. We released....
The ADI Company one ADM1066 is it monitor one piece powers many kinds of of configurated /sequence device, and last 12 ADC and 6 8 DAC of voltage output, all voltage is superior to 0. 5% in the precision of 25 degrees of C, is mainly used in the office....
Maxim now has available a series of five integrated oscillator building blocks in the MAX260x series which cover the frequency range between 45 and 650 MHz. The MAX2606 covers the VHF band, although the frequency can only be varied by approximately ±3 MHz....
Description: LM35 IC Thermal Control Circuit Diagram. Features: LM35DZ detect when the temperature is higher than the preset level, can be used in ....
I found this circuit really simple and interesting. It is really simple to drive Nokia 3310 graphical LCD by using simple LPT cable and some PC software. Firs of all connect graphical LCD to LPT port according to following circuit: Graphical display needs....
Designing an IR demodulator circuit to replace the one shown in this question. Basically I want to demodulate a simple IR signal modulated at 32. 678 kHz. I just need to know if the signal is present. No packets. Just IR present or not present. I have tried....
This alarm siren circuit give continuous frequency sweep, a warbling sound. The warbling period is about 6 seconds, 3 seconds for frequency sweeping up and 3....
The circuit diagram shows two LT1398`s from Linear Technology used to create buffered color-difference signals from RGB (red-green-blue) inputs. In this application, the R input arrives via 75 coax. It is routed to the non-inverting input of amplifier IC1a....
The Finder is a prototype of that device. It is a keychain-sized GPS device with two buttons, Save and Find. Pressing Save records your current location. Pressing Find visually leads you back to the saved location. Up to 9 locations can be saved. Press the....
The circuit below was developed to guard the fish pond. In this case to prevent that the pump sucks just air when the waterlevel get below the pump. When the waterfilters get saturated and dirty, the water level behind the filter gets to an unacceptable....
Electronics Tutorial about the RC Oscillator Circuit, RC Phase Shift Oscillators and how a Tuned RC Oscillator Circuit produces sine waves....
TDA2030 is a circuit integrated monolithic in Pentawat ® package, to be used as class audio amplifier AB. Typically he supplies up to 14 Watts of potency (d=0. 5%) @ 14V/4 ©. The guaranteed potency is 12W in a load of 4 © and 8 watts in a load of 8 ©.....
The control module monitors the fuel tank pressure (FTP) sensor signal in order to detect vacuum decay and excess vacuum during the enhanced evaporative emission (EVAP) diagnostic. The Fuel Tank Pressure Sensor responds to changes in the fuel tank pressure....
The best-known ways to transmit a digital audio signal (S/PDIF) are to use a standard 75? coaxial cable or Toslink optical modules with matching optical c....
This simple pulse width modulation DC motor control eliminates these problems. It controls the motor speed by driving the motor with short pulses. Thesepulses vary in duration to change the speed of the motor. The longer the pulses, the faster the motor....
This is a very simple 555 timer circuit,It make a simple theft detterant which may be just as effective. The idea is to have a flashing red led indicate that your car is protected. This device can protect your vehicle from potential thieves....
This is a circuit of 90-125 MHz Crystal which is very useful for VHF/UHF converters. This circuit provide 5 to 15 mW output. High-quality fifth- or seventh-over-tone crystal type can be used in this circuit. Undesired oscillation never reach above 500 MHz....
The Bio-Stimulator provides muscles` stimulation and invigoration but, mainly, it`s an aid in removing cellulitis. Tape the electrodes to the skin at both ends of the chosen muscle and rotate P1 knob slowly until a light itch sensation is perceived. Each....
This small water sensor alarm circuit makes a loud warning sound when a humidity sensor detects a quantity of water. This circuit assembly is an application of low power comparator LM1801 made by National Semiconductor. The reference voltage for the....
Two KOSS A-1220 headphone amps. Each share the same model number, yet have completely different internals: One uses just a single 12AU7, while the other has a 12AT7 and a pair of 6AQ5A`s. I have searched the forums and found one or two threads about this....
This is a low cost circuit diagram for the emergency light based on white LED. Component: LM317 IC, Resistor, Transformer, LED, Variable ....
This lovely circuit is a real gem! Easy to assemble and more sensitive than many commercial devices available. It`s based around an LF351 low-noise operational amplifier and a 1mF choke acting as the sensor. Unlike most other simple EMF detectors, this one....
The chicken male and female discriminator circuit is composed of the audio detection circuit, active band-pass filter and LED display circuit, and it is shown in Figure 4-11. Audio detection circuit consists of piezoelectric ceramic BC and resistor Rl, R2.....
The following describes the design, construction, operation and use of the DECUS divider module. Photo 2 shows a top view of the module and Photo 3 shows the bottom. The primary use of the module is to condition the 10 megahertz (MHz) signal from a rubidium....
This FETVM replaces the function of the VTVM while at the same time ridding the in-strument of the usual line cord. In addition, drift rates are far superior to vacuum tube circuits allowing a 0. 5 volt full scale range which is impractical with most vacuum....
For this special Halloween project we built a spooky candy bowl that lights up when an unsuspecting trick-or-treater reaches in. While devices like these do exist, many of them use complicated proximity sensors to spring their trap. Here at NerdKits we enjoy....
The following circuit shows about servo motor driver. This circuit based on the 12F675 IC. Features: Timer 0 timing, single control line from ....
This circuit senses AC audio voltage supplied to the car-radio loudspeakers and displays it as power using a LED bar graph, achieving at the same time an attractive visual effect. It is designed to cover common car-radio output power ranges, but can easily....
A simple metal detector circuit diagram and schematic using a single transistor and a radio. This metal detector/sensor project is easy to make and is an application of Colpitts oscillator....
The ISL6308A is a three-phase PWM control IC with integrated MOSFET drivers. It provides a precision voltage regulation system for multiple applications including, but not limited to, high current low voltage point-of-load converters, embedded applications....
Developers of human-computer interface technologies have recently been focusing on the use of bio-electrical signals (eye movement, electrical activity of muscles and brain) as inputs to control devices in order to increase the capacity of signal processing....
1. Driver: L298N Dual H Bridge DC Motor Driver IC 2. Driven part of the terminal supply area Vs: +5 V ~ +35 V; such as the need to take power within the board, the supply area Vs: +7 V ~ +35 V 3. Driven part of the peak current Io: 2A 4. The logical part of....
Electronic Combination Lock. This circuit is very basic to build. To open a the lock which is connected to the K1 Load you must press each momentary switch in the correct sequence. The...
This circuit consists of a single transistor as amplifier and it gives a nice amplification to weakest and unipolar signals for feeding to a real amplifier. Don`t post your email or phone number in the comment box. Only put email address in the email field.....
Digital ICs and opto-isolators provide the drive for this TMOS servo amplifier, resulting in fewer analog circuits and less drift. Fast and consistent turn-on and turn-off characteristics also enable accurate analog output results directly from the digital....
2001 chevy s10 headlights some times work some times dont along with dash indicator light. all other lights work fine. I have changed headlight switch, fuse, relay. checked headlight bulbs. all wires to bulbs are possitive. Yes, I took test lamp and hooked....
This circuit is used in computer RS-232 serial interface and current loop circuit interface, it can transform voltage singal into 20mA current singal, the maximum transmission rate is 1200 bits. CCD IC1, T1 form receiver interface circuit, T2, T3 constitute....
It can be adjusted to give the desired speed for the display. The output of the 555 is directly connected to the input of a CD 4017. The input of the counter is called the CLOCK line (555). The 10 outputs become active, one at a time, on the rising edge of....
The circuit starts timing when switched on. The green LED lights to show that timing is in progress. When the time period is over the green LED turns off, the red LED turns on and the bleeper sounds. The time period is set by adjusting the variable resistor.....
