Popular Circuits Page 246
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Although this circuit uses a 74HC74, any CMOS variant of this flip-flop will work. IC1A acts as a true/ compleme..
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This circuit provides a visual 9 second delay using a 7 segment digital readout LED. When the switch is closed, the CD4010 up/down counter is preset to 9 and the 555 timer is disabled with the output held high..
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It is to be used as amplifier of potency of RF in the high strip of of the power source that should be capable to supply a tension of 13 volts with a current of 10 amperes. it demands right care in the assembly of the source. Terrified armored transformer,....
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This circuit produces 5- to 25-V output to drive a VCO from a standard ± 15-V supply system. R7 and CI supply fr..
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Flash lamp is made ??with experimental parts removed from a disposable camera flash circuit.Xenon try to use what I think is easily affordable experiment. AC100V to a voltage doubler rectifier, DC voltage of about 270V is derived. This voltage is R2, C3 is....
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This FSK demodulator convert the FSK signal to serial digital signal. FSK modulation is used to transmit digital serial data, and we need to demodulate it to...
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-
The AN7158N is an integrated circuit designed for power Amplifier of 7. 5W (16V, 4) output with low noise and low distortion, and it suits TV set with multi-sound. Stereo operation is enabled due to incorporating two Amplifiers on one chip. 12-pin SIL....
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How to build a voltmeter for DC voltage measurements without using multimeter testing This is a simple digital voltmeter circuit that can measure voltages from 0V to 9V. The main part of this circuit is a dot bar display driver IC LM3914. Input voltage....
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This application note includes a brief overview of power amplifier theory and it includes simulation results that provide insight into the operation of the power amplifier on all of MAXIM s LFRF transmitters and transceivers....
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SM is merely pointing out that the tube is capable of producing those frequencies. he talks about using TV tubes to get a better sound at higher frequencies. anyways it doesnt matter what we think he is saying. just experiment it and see if u get anything....
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Electric shaver motor drive circuit It shows a typical motor drive circuit of an electric shaver. AC 220V to charge the battery through the charging circuit, but also for the m..
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Class D amplifier for ATtiny15L microcontroller circuit diagram. These units can get acquainted with one embodiment of the amplifier is Class D. Controller ATtiny15L AVR family firm Atmel is perfectly suited for this purpose, because it contains a ten-digit....
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This simple diode modulator delivers excellent results when used for high percentage modulation at low signal levels. Constants are shown for a carrier frequency of about 10 MHz, but, with a suitable tank, the circuit will give good results at any frequency....
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I poked around till I found an arrangement that worked. Siren circuit: I shorted the reed switch as shown. I removed the power supply and created c....
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The ESR Meter is basically an AC Ohmmeter with special scales and protective circuitry. It provides a continuous reading of series resistance in electrolytic capacitors. It operates at 100 kHz to keep the capacitive reactance factor near zero. The remaining....
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This featured circuit is a musical doorbell. After the button S1 is pressed, a short melody is played. When the button is pressed many times in rapid succession or pressed longer, a different melody is generated and the melody plays longer. The circuit works....
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Are the flowers in pots need watering if the soil surface moist observation alone is sometimes unreliable. For this reason, the production of dry flower instructions which, whe..
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This circuit traps a single positive pulse from a square-wave train. Following the rising edge of an input command, the pulse-out signal emits a replica of one positive pulse of the clock signal simultane ous with the clock signal"s next rising edge. The....
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All the mods were sourced through the Mssiah forum, so thanks to all for sharing. I`ve tried to credit all those responsible, and to help anyone else wanted to do the same I`ve also added a few photos of my build. RCA soldered to GND and rearside of....
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Given by the ultrasonic transmitter circuit T-40-16 and other discrete components. T-40-16 as a feedback sensor..
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The basic idea comes from the AN592 Microchip application note: "Frequency counter using
PIC16C5x". where you may find a simple software wich implements a frequency counter using a
PIC microcontroller.I wrote a specifically designed software to improve....
-
This Simple circuit can be used to Guard your bike from theft. It gives a loud alarm tone if somebody tries to start the bike. The alarm disables only when the hide switch S2 is opened. The circuit has little component count and can be easily fixed in the....
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3904 3906 Siren Circuit. The circuit produces a wailing siren sound when the switch is turned on....
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This circuit measures the distance covered during a walk. 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....
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-
A simple Water level indicator project with circuit diagram for home and industry.This water tank level sensor can be used for any liquid level indicator projects....
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Uses surface-barrier transistors in arrangement wherein pattern of four on stages is stepped along ring, per mining maximum number of stages in ring lo be much higher than in conventional rings. -W. Carlson, Ring Counter has Increased Count Capacity,....
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The following alarm circuit is designed with features which maybe suited for residential and commercial alarm system applications. It has 12V and 1. 5A regulated power supply. Furthermore, this residential alarm circuit also features such delay circuit,....
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The transmitter ambit declared actuality has an added RF ability amplifier stage, afterwards the oscillator stage, to accession the ability achievement to 200-250 milliwatts. With a acceptable analogous 50-ohm arena even antenna or multi-element Yagi....
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Is a capable tube tester, yet its use scenarios can be multiplied with only modest efforts invested in understanding its schematic, regimes, and ways to add new regimes. Eico 666 is capable tester, known to be able to supply voltages and currents adequate....
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-
The circuit was designed to create a modular Class A buffer preamplifier in order to isolate stages in an audio circuit. BF245 a general purpose N-Chann....
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The unit is constructed around a balanced-bridge circuit. using both capacitance and inductance. The bridge consists of capacitors C2 and C3, and the center-tapped winding of Tl. One end of the bridge is coupled to ground by C4, while capacitance changes....
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This device allows one or more lamps to illuminate at sunset and turn off at dawn.
Q1 and Q2 form a trigger device for the SCR, providing short pulses at 100Hz frequency. Pulse duration is set by R2 and C1...
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This circuit produces a sound similar to a factory siren.
It makes use of a 555 timer Ic used as an astable multivibrator of a center frequency of about 300Hz.
The frequency is controlled by the pin 5 of the IC. When the supply is switched ON, the....
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The following circuit shows about Tachometer Circuit Project. This circuit built based on the 555 Timer IC. Features: monostable IC, voltage ....
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Inexpensive miniature transformers normally provide one or two secondary voltages, which is sufficient for generating a set of positive and negative suppl....
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The circuit uses a synchronous-detection scheme to measure low-level resistances. Other low-resis-tance-measuring circui..
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Current handling capability of a power supply system often needed to be checked. Finding high power rated variable resistor to provide variable load testing...
-
It is impossible to imagine present day society without any batteries. Count the number of gadgets in your house that are powered from batteries, you will be stunned by the number of batteries you will find. The majority of these devices use penlight....
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This is just a fun/hobby circuit which can be used as a water sensor circuit or a liquid sensor circuit.What it does is sound an alarm in presence of water/liquid at its probes....
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-
-
This topic covers a resonant equalizer which is a different style circuit than the common audio equalizer, although both produce the same result. The difference here is that the frequency response of both the high and low frequency equalizer covered on the....
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-
When firs time found this article, i think it`s a great project using only few component. I like microcontroller project based on LED. And as you know this project very simple. I must try it. one day "I was always fascinated by the emergence of patterns. One....
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-
Quadrature oscillator is another type of phase shift oscillator. This circuit produce two sine wave signal. One of them is shifted 90 degree from the other....
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Here the wailing alarm circuit diagram: Component parts List: R1,R5 4.7KR2 47KR3 10KR4 100KRx *see text C1,C4 100uF/25V, electrolyticC2,C3 0.01uF (10nF),....
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AD574A is a high performance 12-bit successive approximation. A/D converter can be directly with the 8 or 16-bit microprocessor bus interface. Input into AD574A analog voltage,..
-
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 natural lighting exists, to take conventional film pictures with enhanced contrast using a fill-in` flash....
-
This circuit was originally designed to detect weak flashed of laser light bounced off of a fabric video projection screen. It was used as part of a firearm training system. It generates a 100mS output pulse whenever it detects a 3ms to 5ms-laser burst,....
-
If you wish to use a double power supply but don`t have a center trapped transformer you can use an electronic circuit in the following configuration. This electronic circuit uses a second rectifier bridge coupled with secondary coil of the transformer using....
-
LVDTs (linear variable differential transformers) are electromechanical measuring devices that convert the position of a magnetic core into electrical signals. You generate these signals via excitation on the primary side. The results on the secondary....
-
The following circuit shows about VHF Pre-Amplifier Circuits Diagram. This circuit using the BFS17 Transistor. Features: used as a VHF ....
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-
The burglar chaser makes a great accessory for any alarm system. It creates brilliant flashes of white light and a loud, irritating sound from a metal horn buzzer. Transformer T1 is connected to Ql, Rl, and R2 to form a blocking oscillator. This creates a....
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This is my first autonomous robot. I built it to explore the interfacing of various sensors to a PICAXE processor. His mission is to search for a magn....
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By a clock with a calendar Ultrasonic Ranging IC SB5027 constitute a circuit diagram of an ultrasonic range finder ..
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A D/A converter using binary-weighted resistors is shown in the figure below. In the circuit, the op-amp is connected in the inverting mode. The op-amp can also be connected in the non-inverting mode. The circuit diagram represents a 4-digit converter. Thus,....
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Build this circuit using a Digi-Key Electronics Barrel Crystal (CA-301), 15 Mhz for a standard output frequency of 150. 00 Mhz. If you want to customize the frequency, follow the directions below. I usually build this circuit to operate between 150 to 165....
-
This bi-stable circuit uses an op-amp, acts similar with RS flip-flop. Bi-stable circuit is a circuit with two stable states, low and remain low until set is....
-
Circuit principle outside into the phone when ringing pulses through C1, R1, D2 to C2 charging voltage in 6V, this voltage causes N1, N2 reverse, V1 analog hook, and start V4, ..
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an electronic project to build a multivibator as a basic first test instrument - ideal for trouble shooting radio repairs. Includes a how to use guide. An excellent beginner project....
-
This was originally developed a timing accessory for a sequencer I was working on, though when fed from a VCO, interesting frequency trills like those of the old 8-bit computer games can be produced. Feeding the control voltage from a Psycho LFO produces....
-
The digital circuit additional a circuits taht is very useful is On-Shots circuit or Also known as Mono-stable multivibrator circuit. This behavior is the....
-
So, if you have been following me on twitter, you might have noticed this tweet where I raved about a "Transistor Clock" kit that lets you build a wall clock using 194 discrete transistors and hundreds of other components. I`ve since purchased the kit and....
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-
Using a single 555 Timer IC and a small transformer to generate a high voltage, this circuit will test zener diodes of voltage ratings up to 50VDC. The 555 timer is used in the astable mode, the output at pin3 drives a small audio transformer such as the....
-
Imagine devices that can disable and destroy microorganisms-viruses, bacteria and fungi - by means of a pulsed, intense, magnetic field! They are not devices for the distant future. They are for today! Already several different pulsed magnetic field....
-
The on-off-type DC/ DC converter has two kinds of operating modes: One kind keeps the switch duty cycle worker constant, the controlled switch turns on time sha. Pulse length modulation PWM of n Way; Ton is constant that another kind keeps turning on time,....
-
This circuit is a laser alarm system like the one we see in various movies. It uses a laser pointer beam to secure your valuables and property. Essentially, when the beam gets interrupted by a person, animal or object, the resistance of a photodiode will....
-
This circuit is a simple detection of air flow, this circuit can be signaled in the event of air flow. The sensor used is a filament incandescent lamps. Air Flow Detector, sensor, LED, LM339, op-amp,...
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Designing a controller PCB for a 10x10 white LED matrix clock (inspired by the tutorial here ). It`s based off an ATmega328 AVR IC and Maxim DS3234 SPI RTC. However, I`m stuck: I have no idea how to control my custom non-standard 10x10 LED matrix. Originally....
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This odd little amp was something I designed and built for a shootout at the European Triode Festival in 2007. The topic was "White Light" - amplifiers that use thoriated tungsten tubes. Some great photos of the event can be found here and here. Since it`s....
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This antenna is made from 1/2" copper tubing and it is soldered together with plumbing tees, elbows, and nipples....
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Circuit diagram is a simple parking sensors, sensing the distance between where the rear bumper of the car and obstacles behind the car. In the circuit diagram there are two parts to the scheme and the scheme for the transmitter receiver. Distance can be....
-
Control a little 5v motor from an external power supply by using the Arduino to trigger a transistor. Like this: Is that at all correct Will it work I want to experiment but I don`t want to break my new toy in the process. The transistor I am using is an....
-
The Universal Development Board has external 5v Relay interfacing, indicated as in Figure. ULN2803 is used as a driver for FPGA I/O lines, drivers output connected to relay modules. PTB connector provided for external power supply if needed. Signal LEDs for....
-
-
The laser-pointer detection circuitry is able to determine when a laser light is aimed at a particular photosensor. If the laser is aimed at the top sensor, the comparator chip outputs on . If the laser is aimed at the bottom sensor, the comparator chip....
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This circuit is selective for the tuning adjustment between two closely spaced tones audio. The frequency is dependent on the selective value capacitors and resistors in the feedback circuit between the collector and base of Q1. With the values shown, the....
-
Most of the newer PIC come with the EUSART module which have the function for auto baud rate detection. The features allow a person to set the baud rate at runtime by sending the character "U" or 0x55 to the PIC. With ABDEN (auto baud rate enable) bit set....
-
This circuit provides a digital square wave that can be viewed directly or used to drive other circuits. It used the CMOS 4047 Low-Power Monostable/Astable Multivibrator. As used in Tom Duncan's Adventures with Digital Electronic's Book, to drive CMOS Decade....
-
The TA2003PG TA2003FG are AM / FM Radio IC (FM F / E+AM / FM IF) which are designed for AM / FM Radios Combining with the TA7368P (Mono PW IC), a suitable AM / FM Radio system is able to be constituted. By Toshiba Semiconductor ..
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The GS1674 is a high-speed BiCMOS integrated circuit designed to equalize and restore signals received over 75ohm coaxial cable. The device is optimized for performance at 270Mb/s and 1. 485Gb/s, and features DC restoration to compensate for the DC content....
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Construction of buildings, when full power is not required fluorescent continuous operation, the application dimmable electronic ballasts can further reduce power consumption w..
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A simple 2 Transformer, 4 Germanium Diode Ring Modulator with a true bypass switching scheme. Includes input for Carrier Wave modulation. Power is only required for the status LED...
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This 24V to 36V linear battery charger is long overdue. While this is an old circuit technique, it is optimized for charging higher voltage lead-acid batte....
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This simple circuit mixes two or more channels into one channel (eg. stereo into mono). The circuit can mix as many or as few channels as you like and consumes very little power. The mixer is shown with two inputs, but you can add as many as you want by just....
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Only one LED can be on when the circuit is at rest. Which LED is illuminated is determined by the touch pick-up that last had human contact. Pickup terminal A controls the on condition of LEDl, and terminal B controls the on condition of LED2. ..
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This circuit provides up to 20 V output from a 12-V automotive supply, to enable constant current charging o..
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The touch control screen is not any fresh thing, present electronic product basically all have a colored liquid crystal greatly, add a touch type touch control screen. It is very convenient to use, can totally replace that kind of fixed key set in the past.....
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Although this circuit uses a 74HC74, any CMOS variant of this flip-flop will work. IC1A acts as a true/ compleme..
This circuit provides a visual 9 second delay using a 7 segment digital readout LED. When the switch is closed, the CD4010 up/down counter is preset to 9 and the 555 timer is disabled with the output held high..
It is to be used as amplifier of potency of RF in the high strip of of the power source that should be capable to supply a tension of 13 volts with a current of 10 amperes. it demands right care in the assembly of the source. Terrified armored transformer,....
This circuit produces 5- to 25-V output to drive a VCO from a standard ± 15-V supply system. R7 and CI supply fr..
Flash lamp is made ??with experimental parts removed from a disposable camera flash circuit.Xenon try to use what I think is easily affordable experiment. AC100V to a voltage doubler rectifier, DC voltage of about 270V is derived. This voltage is R2, C3 is....
This FSK demodulator convert the FSK signal to serial digital signal. FSK modulation is used to transmit digital serial data, and we need to demodulate it to...
The AN7158N is an integrated circuit designed for power Amplifier of 7. 5W (16V, 4) output with low noise and low distortion, and it suits TV set with multi-sound. Stereo operation is enabled due to incorporating two Amplifiers on one chip. 12-pin SIL....
How to build a voltmeter for DC voltage measurements without using multimeter testing This is a simple digital voltmeter circuit that can measure voltages from 0V to 9V. The main part of this circuit is a dot bar display driver IC LM3914. Input voltage....
This application note includes a brief overview of power amplifier theory and it includes simulation results that provide insight into the operation of the power amplifier on all of MAXIM s LFRF transmitters and transceivers....
Electric shaver motor drive circuit It shows a typical motor drive circuit of an electric shaver. AC 220V to charge the battery through the charging circuit, but also for the m..
Class D amplifier for ATtiny15L microcontroller circuit diagram. These units can get acquainted with one embodiment of the amplifier is Class D. Controller ATtiny15L AVR family firm Atmel is perfectly suited for this purpose, because it contains a ten-digit....
This simple diode modulator delivers excellent results when used for high percentage modulation at low signal levels. Constants are shown for a carrier frequency of about 10 MHz, but, with a suitable tank, the circuit will give good results at any frequency....
I poked around till I found an arrangement that worked. Siren circuit: I shorted the reed switch as shown. I removed the power supply and created c....
The ESR Meter is basically an AC Ohmmeter with special scales and protective circuitry. It provides a continuous reading of series resistance in electrolytic capacitors. It operates at 100 kHz to keep the capacitive reactance factor near zero. The remaining....
This featured circuit is a musical doorbell. After the button S1 is pressed, a short melody is played. When the button is pressed many times in rapid succession or pressed longer, a different melody is generated and the melody plays longer. The circuit works....
Are the flowers in pots need watering if the soil surface moist observation alone is sometimes unreliable. For this reason, the production of dry flower instructions which, whe..
This circuit traps a single positive pulse from a square-wave train. Following the rising edge of an input command, the pulse-out signal emits a replica of one positive pulse of the clock signal simultane ous with the clock signal"s next rising edge. The....
All the mods were sourced through the Mssiah forum, so thanks to all for sharing. I`ve tried to credit all those responsible, and to help anyone else wanted to do the same I`ve also added a few photos of my build. RCA soldered to GND and rearside of....
Given by the ultrasonic transmitter circuit T-40-16 and other discrete components. T-40-16 as a feedback sensor..
The basic idea comes from the AN592 Microchip application note: "Frequency counter using PIC16C5x". where you may find a simple software wich implements a frequency counter using a PIC microcontroller.I wrote a specifically designed software to improve....
This Simple circuit can be used to Guard your bike from theft. It gives a loud alarm tone if somebody tries to start the bike. The alarm disables only when the hide switch S2 is opened. The circuit has little component count and can be easily fixed in the....
3904 3906 Siren Circuit. The circuit produces a wailing siren sound when the switch is turned on....
This circuit measures the distance covered during a walk. 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....
A simple Water level indicator project with circuit diagram for home and industry.This water tank level sensor can be used for any liquid level indicator projects....
Uses surface-barrier transistors in arrangement wherein pattern of four on stages is stepped along ring, per mining maximum number of stages in ring lo be much higher than in conventional rings. -W. Carlson, Ring Counter has Increased Count Capacity,....
The following alarm circuit is designed with features which maybe suited for residential and commercial alarm system applications. It has 12V and 1. 5A regulated power supply. Furthermore, this residential alarm circuit also features such delay circuit,....
The transmitter ambit declared actuality has an added RF ability amplifier stage, afterwards the oscillator stage, to accession the ability achievement to 200-250 milliwatts. With a acceptable analogous 50-ohm arena even antenna or multi-element Yagi....
Is a capable tube tester, yet its use scenarios can be multiplied with only modest efforts invested in understanding its schematic, regimes, and ways to add new regimes. Eico 666 is capable tester, known to be able to supply voltages and currents adequate....
The circuit was designed to create a modular Class A buffer preamplifier in order to isolate stages in an audio circuit. BF245 a general purpose N-Chann....
The unit is constructed around a balanced-bridge circuit. using both capacitance and inductance. The bridge consists of capacitors C2 and C3, and the center-tapped winding of Tl. One end of the bridge is coupled to ground by C4, while capacitance changes....
This device allows one or more lamps to illuminate at sunset and turn off at dawn. Q1 and Q2 form a trigger device for the SCR, providing short pulses at 100Hz frequency. Pulse duration is set by R2 and C1...
This circuit produces a sound similar to a factory siren. It makes use of a 555 timer Ic used as an astable multivibrator of a center frequency of about 300Hz. The frequency is controlled by the pin 5 of the IC. When the supply is switched ON, the....
The following circuit shows about Tachometer Circuit Project. This circuit built based on the 555 Timer IC. Features: monostable IC, voltage ....
Inexpensive miniature transformers normally provide one or two secondary voltages, which is sufficient for generating a set of positive and negative suppl....
The circuit uses a synchronous-detection scheme to measure low-level resistances. Other low-resis-tance-measuring circui..
Current handling capability of a power supply system often needed to be checked. Finding high power rated variable resistor to provide variable load testing...
It is impossible to imagine present day society without any batteries. Count the number of gadgets in your house that are powered from batteries, you will be stunned by the number of batteries you will find. The majority of these devices use penlight....
This is just a fun/hobby circuit which can be used as a water sensor circuit or a liquid sensor circuit.What it does is sound an alarm in presence of water/liquid at its probes....
This topic covers a resonant equalizer which is a different style circuit than the common audio equalizer, although both produce the same result. The difference here is that the frequency response of both the high and low frequency equalizer covered on the....
When firs time found this article, i think it`s a great project using only few component. I like microcontroller project based on LED. And as you know this project very simple. I must try it. one day "I was always fascinated by the emergence of patterns. One....
Quadrature oscillator is another type of phase shift oscillator. This circuit produce two sine wave signal. One of them is shifted 90 degree from the other....
Here the wailing alarm circuit diagram: Component parts List: R1,R5 4.7KR2 47KR3 10KR4 100KRx *see text C1,C4 100uF/25V, electrolyticC2,C3 0.01uF (10nF),....
AD574A is a high performance 12-bit successive approximation. A/D converter can be directly with the 8 or 16-bit microprocessor bus interface. Input into AD574A analog voltage,..
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 natural lighting exists, to take conventional film pictures with enhanced contrast using a fill-in` flash....
This circuit was originally designed to detect weak flashed of laser light bounced off of a fabric video projection screen. It was used as part of a firearm training system. It generates a 100mS output pulse whenever it detects a 3ms to 5ms-laser burst,....
If you wish to use a double power supply but don`t have a center trapped transformer you can use an electronic circuit in the following configuration. This electronic circuit uses a second rectifier bridge coupled with secondary coil of the transformer using....
LVDTs (linear variable differential transformers) are electromechanical measuring devices that convert the position of a magnetic core into electrical signals. You generate these signals via excitation on the primary side. The results on the secondary....
The following circuit shows about VHF Pre-Amplifier Circuits Diagram. This circuit using the BFS17 Transistor. Features: used as a VHF ....
The burglar chaser makes a great accessory for any alarm system. It creates brilliant flashes of white light and a loud, irritating sound from a metal horn buzzer. Transformer T1 is connected to Ql, Rl, and R2 to form a blocking oscillator. This creates a....
This is my first autonomous robot. I built it to explore the interfacing of various sensors to a PICAXE processor. His mission is to search for a magn....
By a clock with a calendar Ultrasonic Ranging IC SB5027 constitute a circuit diagram of an ultrasonic range finder ..
A D/A converter using binary-weighted resistors is shown in the figure below. In the circuit, the op-amp is connected in the inverting mode. The op-amp can also be connected in the non-inverting mode. The circuit diagram represents a 4-digit converter. Thus,....
Build this circuit using a Digi-Key Electronics Barrel Crystal (CA-301), 15 Mhz for a standard output frequency of 150. 00 Mhz. If you want to customize the frequency, follow the directions below. I usually build this circuit to operate between 150 to 165....
This bi-stable circuit uses an op-amp, acts similar with RS flip-flop. Bi-stable circuit is a circuit with two stable states, low and remain low until set is....
Circuit principle outside into the phone when ringing pulses through C1, R1, D2 to C2 charging voltage in 6V, this voltage causes N1, N2 reverse, V1 analog hook, and start V4, ..
an electronic project to build a multivibator as a basic first test instrument - ideal for trouble shooting radio repairs. Includes a how to use guide. An excellent beginner project....
This was originally developed a timing accessory for a sequencer I was working on, though when fed from a VCO, interesting frequency trills like those of the old 8-bit computer games can be produced. Feeding the control voltage from a Psycho LFO produces....
The digital circuit additional a circuits taht is very useful is On-Shots circuit or Also known as Mono-stable multivibrator circuit. This behavior is the....
So, if you have been following me on twitter, you might have noticed this tweet where I raved about a "Transistor Clock" kit that lets you build a wall clock using 194 discrete transistors and hundreds of other components. I`ve since purchased the kit and....
Using a single 555 Timer IC and a small transformer to generate a high voltage, this circuit will test zener diodes of voltage ratings up to 50VDC. The 555 timer is used in the astable mode, the output at pin3 drives a small audio transformer such as the....
Imagine devices that can disable and destroy microorganisms-viruses, bacteria and fungi - by means of a pulsed, intense, magnetic field! They are not devices for the distant future. They are for today! Already several different pulsed magnetic field....
The on-off-type DC/ DC converter has two kinds of operating modes: One kind keeps the switch duty cycle worker constant, the controlled switch turns on time sha. Pulse length modulation PWM of n Way; Ton is constant that another kind keeps turning on time,....
This circuit is a laser alarm system like the one we see in various movies. It uses a laser pointer beam to secure your valuables and property. Essentially, when the beam gets interrupted by a person, animal or object, the resistance of a photodiode will....
This circuit is a simple detection of air flow, this circuit can be signaled in the event of air flow. The sensor used is a filament incandescent lamps. Air Flow Detector, sensor, LED, LM339, op-amp,...
Designing a controller PCB for a 10x10 white LED matrix clock (inspired by the tutorial here ). It`s based off an ATmega328 AVR IC and Maxim DS3234 SPI RTC. However, I`m stuck: I have no idea how to control my custom non-standard 10x10 LED matrix. Originally....
This odd little amp was something I designed and built for a shootout at the European Triode Festival in 2007. The topic was "White Light" - amplifiers that use thoriated tungsten tubes. Some great photos of the event can be found here and here. Since it`s....
Circuit diagram is a simple parking sensors, sensing the distance between where the rear bumper of the car and obstacles behind the car. In the circuit diagram there are two parts to the scheme and the scheme for the transmitter receiver. Distance can be....
Control a little 5v motor from an external power supply by using the Arduino to trigger a transistor. Like this: Is that at all correct Will it work I want to experiment but I don`t want to break my new toy in the process. The transistor I am using is an....
The Universal Development Board has external 5v Relay interfacing, indicated as in Figure. ULN2803 is used as a driver for FPGA I/O lines, drivers output connected to relay modules. PTB connector provided for external power supply if needed. Signal LEDs for....
The laser-pointer detection circuitry is able to determine when a laser light is aimed at a particular photosensor. If the laser is aimed at the top sensor, the comparator chip outputs on . If the laser is aimed at the bottom sensor, the comparator chip....
This circuit is selective for the tuning adjustment between two closely spaced tones audio. The frequency is dependent on the selective value capacitors and resistors in the feedback circuit between the collector and base of Q1. With the values shown, the....
Most of the newer PIC come with the EUSART module which have the function for auto baud rate detection. The features allow a person to set the baud rate at runtime by sending the character "U" or 0x55 to the PIC. With ABDEN (auto baud rate enable) bit set....
This circuit provides a digital square wave that can be viewed directly or used to drive other circuits. It used the CMOS 4047 Low-Power Monostable/Astable Multivibrator. As used in Tom Duncan's Adventures with Digital Electronic's Book, to drive CMOS Decade....
The TA2003PG TA2003FG are AM / FM Radio IC (FM F / E+AM / FM IF) which are designed for AM / FM Radios Combining with the TA7368P (Mono PW IC), a suitable AM / FM Radio system is able to be constituted. By Toshiba Semiconductor ..
The GS1674 is a high-speed BiCMOS integrated circuit designed to equalize and restore signals received over 75ohm coaxial cable. The device is optimized for performance at 270Mb/s and 1. 485Gb/s, and features DC restoration to compensate for the DC content....
Construction of buildings, when full power is not required fluorescent continuous operation, the application dimmable electronic ballasts can further reduce power consumption w..
A simple 2 Transformer, 4 Germanium Diode Ring Modulator with a true bypass switching scheme. Includes input for Carrier Wave modulation. Power is only required for the status LED...
This 24V to 36V linear battery charger is long overdue. While this is an old circuit technique, it is optimized for charging higher voltage lead-acid batte....
This simple circuit mixes two or more channels into one channel (eg. stereo into mono). The circuit can mix as many or as few channels as you like and consumes very little power. The mixer is shown with two inputs, but you can add as many as you want by just....
Only one LED can be on when the circuit is at rest. Which LED is illuminated is determined by the touch pick-up that last had human contact. Pickup terminal A controls the on condition of LEDl, and terminal B controls the on condition of LED2. ..
This circuit provides up to 20 V output from a 12-V automotive supply, to enable constant current charging o..
The touch control screen is not any fresh thing, present electronic product basically all have a colored liquid crystal greatly, add a touch type touch control screen. It is very convenient to use, can totally replace that kind of fixed key set in the past.....
