Popular Circuits Page 145
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The LED traffic Light circuit controls 6 LEDs (red, yellow and green) for both north/south directions and east/west directions. The timing sequence is generated using a CMOS 4017 decade counter and a 555 timer. Counter outputs 1 through 4 are wire ORed using....
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The circuit features automatic Exit and Entry delays, timed Bell Cut-off and System Reset. It has provision for normally-open and normally-closed switches and will suit the usual input devices (Pressure Mats, Magnetic Reed contacts, Foil Tape, PIRs and....
-
You should notice that the opto-isolator LEDs are connected to three wires labeled "FWD", "REV", and "ENA*. " These wires deserve a bit of explanation. The FWD, REV, and ENA* lines are the interface between the bridge and the microprocessor. You will notice....
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The security system application and program offers a simple demonstration of the BASIC Serial Interface. By adding only a few door and window switches, a transistor, a siren, (see schematic) and a few lines of BASIC program (see program listing) the....
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This Nicad battery tester discharges the test battery at a rate of 500 mA. When the endpoint of 1 V (determined by set..
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-
Electronic Door Release Circuit This circuit is designed to operate an electrical door-release mechanism - but it will have other applications. Enter the four-digit code of your choice - and the relay will energize for the perio....
-
Autotransformer voltage starting, starting time 30-60s adjustable. Figure, SDJ electrode liquid level sensor HJ-13-type, pump control system box with HKD-21B type, 1MK level mo..
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As shown in FIG homemade wireless remote control circuit diagram; A motor remote road works Wireless remote control transmitter circuit As shown for the remote control transmit..
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This small transmitter uses a hartley type oscillator. Normally the capacitor in the tank circuit would connect at the base of the transistor, but at VHF the base emitter capacitance of the transistor acts as a short circuit, so in effect, it still is. The....
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For the shorter wavelength VHF and UHF bands it`s more practical to construct more complex antennas such as a single band Slim Jim or Yagis; I`ve had a go at a few such projects. Other projects will be an electronic unit of some kind: For the Intermediate....
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Integrated circuit input side has a oscillating circuit,it`s oscillation frequency depends on external components L1, C1 and sensor`s equivalent capacitance, the latter size increases with liquid immersion. Oscillating signal add on the threshold switch....
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The design is a clone of Steve Ward`s MiniSSTC circuit; the schematic is reprinted here with credits to Steve Ward: 9schem. jpg. This circuit performs very well for a low power and simple SSTC. My design is based on Steve`s final revised circuit that employs....
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This simple electronic bicycle horn circuit uses only one gate of a 4093 quad 2-input NAND Schmitt trigger, U1, conected in a simple, low frequency, square....
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This is designed to be used as a programmable LED display for numerous applications. I also wanted to include some additional features so that the display can be used instantly. The display uses a sure 8 x 32 LED dot matrix. This is interfaced to a Xino (or....
-
-
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....
-
In this project, you will make a simple 3-stage low-power broadcast-type circuit, using a crystal oscillator integrated circuit and an a collector modulated AM oscillator with amplifier. You can connect the circuit to the an electred microphone or amplified....
-
Circuits of this kind are intended to drive LED Arrays in order to create more visibility and conspicuity when a vehicle is stopped or stopping. This circuit, in particular, will emit a visual alerting signal of 4 short flashes, followed by a steady on light....
-
-
Although the IC has been replaced to a large extent this circuit, the flexibility of the circuit design of discrete devices still make it practical. The parts are readily avail..
-
The circuit monitors the input to the microprocessor 5 V regulated supply for voltage drops and initiates a reset sequence before supply regulation is lost. In operation, the resistor capacitor combination Rs and Cj form a short time constant smoothing....
-
Speed control is accomplished by pulse width modulating the gates of two MGP20N45 TMOS devices. Therefore, motor speed is proportional to the pulse width of the incoming digital signal, which can be generated by a microprocessor or digital logic. The....
-
The power supply varies, and the circuit must operate on under 10uA of current (not counting charging the cap). It triggers an SCR every 10-30 seconds as long as the power supply is above 1. 8VDC, and must operate across a range of 1. 8 and 7. 0 VDC. The....
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A BA1404 IC is used to generate a complete FM MPX signal. The chip contains all of the necessary circuitry. CI and R3, and R4 and C4 provide pre-emphasis. The transmitter runs on a single AA cell. L3 is 3 turns of #20 wire on a Ke drill (for a form). L3 is....
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this tone generator can be used to control your robot. you will need to use the tone decoder for this. to widen the range, higher or lower - substitute a higher, or lower valued capacitor for c1. for frequencies about 5khz and 15khz, use a piezoelectric....
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This article describes the DDDAC 2000 Audiophile projects (1N4001). The content is very simple, very helpful. Components in this article can help you understand better understanding of this article. For example, in this article, you can go to find and buy....
-
In most countries it is now mandatory or at least recommended to have a rear fog light on a trailer with the additional requirement that, when the trailer is coupled to the car, the rear fog light of the towing car has to be off. The circuit shown here is....
-
The circuit is a LED driver which responds to ambient lightas wellas to the presence of any intruder, and varies its illumination accordingly, lets know more. Also I would like to have an ambient sensor to switch on and off and a proximity sensor to switch....
-
This audio distribution electronic project circuit diagram is designed using the TL064 or TL06 operational amplifiers and some other common electronic parts. ..
-
This simple counter is useful for frequency measurements of various wireless equipments, especially transmitters, receivers and signal generators in VHF/UHF band...
-
The amplifier drives a pair of loudspeakers using two LM3876 integrated power amp ICs (50 watts per channel), or a pair of headphones via a Meier crossfeed filter and an OPA2134 dual opamp. It provides four switchable line level inputs, and an unbuffered....
-
The ADM660 is a charge-pump voltage converter that can be used to either invert the input supply voltage or double it. The schematic below appearsADM660 Voltage Inverter Circuit Configuration Diagram. This inverting schematic is ideal for generating a....
-
-
My mobile rig, a Kenwood TM-D710E, needed a GPS receiver for APRS use. The GPS-710 wasn`t readily available and, besides, is quite expensive. I therefore decided to build my own. I found a Royaltek RGM-3600 GPS receiver on eBay for less than £20. This is a....
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This circuit has a long and storied history - starting with an idea by Rich Piotter, then being honed and simplified by Wilf Rigter and Bruce Robinson. The final result does not show the necessary motor drivers (usually H-bridge based), but here`s the....
-
As shown for the TDA8350Q test circuit, the circuit is in the push-pull amplifier output terminal resistor as a dummy load testing alternative deflection coil. ..
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NJM2268 is a dual Video 6dB Amplifier with 75 drivers for S-VHS VCRsHI-BAND VCRsetc. One channel has clamp function that fixes DC level of Video signal and another one is bias type. Furthermore it has 75 drivers to be connected to TV monitors directly and....
-
This is a handy, easy to build general purpose 50 watt amp. The amp has an input for a radio, TV, stereo or other line level device. It also has a phono input for a record player, guitar, microphone or other un-amplified source. With the addition of a low....
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-
The sensor circuit is adaptable to different liquids and sensors. The constant-current source drives current through the sensing probe and a fixed resistor..
-
This Blog show the Different Electronics Circuit Design, Application, Fields and Resources which could help students, engineers, professionals, and common people whose interest is in electronics! For your comments, suggestions, or your looking for a circuit....
-
This is a simple and easy to construct digital dice circuit. The circuit is based on a single IC, CD4060B. The dice consists of six LEDs marked D1 to D6. The number of LEDs glowing indicates the numeral. The heart of this circuit is 14 stage binary ripple....
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Power-supply controller has staggered voltage-output sequencing. Four voltage outputs turn on simultaneously for voltage tracking; two outputs for core and I/O supplies during power-up and two outputs for line driver supplies where tracking is not critical....
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-
Bruco Integrated Circuits B.V. >> Case: Automotive alternator voltage regulator - Bruco....
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IC1A op-amp is wired as an inverting amplifier, having its gain set by a three ways switch inserting different value resistors in parallel to R4. This input stage is followed by an active three-band tone control stage having unity gain when controls are set....
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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....
-
As shown in the radio remote lighting switch with RCM1 type radio-controlled remote control transmitter and receiver components as a circuit. Circuit from RCM1A/B component for..
-
One of my backup systems uses a Magnum MS-PAE 4024 inverter, which doesn`t have any built-in fan controller. Since batteries give off hydrogen during both normal and equalization charging, it`s important to vent the batteries to the outside with a brushless....
-
This is a water sensor circuit design using based on a Conductive Liquid Level Sensor, this single chip circuit is very compact and simple. This circuit is an ac excited fluid level sensor, which uses alternating current to provide biasing for the sensor....
-
A signal-injection circuit for control-loop analysis is flat from dc to 200 kHz, isolated from chassis ground and easily constructed with a readily available instrumentation amplifier....
-
A prototype model of Agriculture Based Robot . Till recently the farmers were using age-old instruments in cultivating their lands. They themselves were putting the manuallabor. Hence there was thelabor problem. Farmer`s facing this type oflaborshortage.....
-
As per the note on the schematic IC-2 is a 74HC74 TTL chip, look up the data sheet and it will show you what pins 7 and 14 are. The note for IC-3 is down lower its an AC optocoupler part number MOC3041. D2 is noted as a 15volt. 4 watt zener diode, a part....
-
Although the modular Portable Mixer design available on these web pages has become a hit for many amateurs, some correspondents required a much simpler device, mainly for mixing mono signals. This design should fulfil their needs, featuring three inputs with....
-
-
Ni-Cd Ni-MH Adjustable Constant Current Battery Charger Circuit This is a Adjustable Constant Current Ni-MH or Ni-Cd battery charger circuit. It....
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Dual power for each complex since load is supplied by means of two-way power Meanwhile, when the way in which the power outage, contact switches from closing movement, not by t..
-
The schematic requires few components, because the timer function has been incorporated by Nutchip. For once, from the start, made up of contacts of the relay RE1 connected to terminal M2. If we turn on an appliance at the end of time, we will use the relay....
-
A simple buzzer to convert to an oscillating buzzer so as to obtain the sound similar to that of an automobile`s reverse indicator. I`ve posted a schematic(borrowed from electroschematics. com) below. I intent to replace the LED with my buzzer and omit the....
-
This design is to achieve a long-distance wireless remote control switch lighting control system consists of two parts the transmission system and the reception system...
-
Make your own solar powered robot at home using things you probably already have. Transistors, resistor, capacitor, solar battery and flashing LED are available at any electronic store, if you don't already have them. Solar cells out of calculators work as....
-
Three circuit options
Can be synchronized to Christmas tree flashing lights This circuit generates a dual-tone bells ringing similar to most door-bell units. It can be used in many applications other than door-bell. In the Notes below several options will....
-
Circuit works as follows: The electrical circuit is a light, a light electric sound conversion circuit with two simple fiber optic connector for experimental play is shown. f W..
-
-
This is a simple project circuit for 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 consume very little power. This is the figure of the circuit. This circuit is based on or....
-
A motorcycle or boat battery that is not needed over the winter is usually charged before being put away for the winter, after which it remains standing unused for months on end. As a result, it accumulates deposits of lead sludge, which can result in....
-
2003 The US Trade and Development Agency has increased the performance of the same pin configuration as the 2002 US Trade and Development Agency. In the United States Trade and..
-
Using MAX641 integrated circuit, manufactured by Maxim IC, can be designed a very simple step-up converter using few electronic components. This step-up high voltage converter electronic projects allows a maximum output current up to 1A. Low battery voltage....
-
An useful feature of this circuit is that the frequency can be changed by changing a capacitor value, a switch can be add to choose between various frequencies...
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-
-
-
Neon lamp or tube lamp need high voltage to trigger the ionization of the gas inside the tube. After the ionization occurs, the voltage drops around 40 volts....
-
Shown for the precision digital timing control circuit. The controller consists of crystal oscillator circuit, a divider, counting circuit, monostable flip-flops...
-
Here is a simple circuit which can be used for decoration purposes or as an indicator. Flashing or dancing speed of LEDs can be adjusted and various dancing patterns of lights can be formed.
The circuit consists of two astable multivibrators. One....
-
The IRF820 MOSFET has a voltage rating of 500v, it should work well in preamp stages of most tube amps. The 100 ohm resistor is there to suppress H.F. oscillations. If IRF820 is physically close to the 12AX7 plate, you probably won't need it. You can see how....
-
I built two secondary coils: Small coil D25.4/H119 (Diameter=25.4mm and Height=119mm) and Medium coil D73/H228. I experimented with the spark gap, and observed that a series spark gap is better in terms of power handling, noise, and spark discharge length.....
-
-
Hi there - i`m a newbie here so please be nice if I tread on any toes And please take a deep breath - I have a fair bit to say, so go get some popcorn ....
-
Using the OBD-II (On Board Diagnostics) protocol, we can read live information from a car`s computer with our NerdKits microcontroller kit, as explained by our guest star, Elena T. , MIT class of 2011. This uses the port under your steering wheel to receive....
-
PicCon is a PIC microcontroller based radio controller designed for hidden transmitter hunting. When combined with a radio transmitter, it will produce tone sequences and Morse code messages at user-programmed times. It is completely field programmable via....
-
-
autodyne n. A heterodyne radio device in which one tube serves simultaneously as oscillator and detector....
-
My product requires a voltage-controlled, current-limited power supply and for a number of years I have used various switcher chips with an op-amp to feed back a current sense voltage to the feedback pin. For the last couple of years I have been using an....
-
Nowadays, it is no longer necessary to use discrete components to build oscillators. Instead, many manufacturers provide ready-made voltage-controlled oscillator (VCO) ICs that need only a few frequency-determining external components. One example is the RF....
-
-
-
This is a discrete high current switch mode LED driver circuit. The basics of this circuit is a buck-converter principle. The efficiency of this circuit is 80....
-
This circuit is presented as an alternative to the IR beam break detector featured in the June 2009 issue (Silicon Chip). In order to make it relatively insensitive to ambient light, it uses a standard IR receiver IC such as the Jaycar ZD-1942. This has a....
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AC contactor DC transformer circuit a run AC voltage regulator circuit operation DC contactors have a variety of types, ..
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Not every new use of technology requires a microcontroller. This one uses a 12 volt computer fan from CompUSA, a snap close food box from Walmart, some PVC pipe from Home Depot, and a large plastic storage container from Big Lots.e food storage box whose lid....
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Dispenser (Aucma) temperature detection control circuit It shows the dispenser (Aucma) temperature detection control circuit. The dispenser is composed of two parts, one part i..
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Low power ( 3 to 30 MHz) transmitters constructed by hams are generally called QRP`s. For such transmitters a well tuned antenna is a must. If the impedance is not properly matched there will be a little or no output. But if properly matched there will be....
The LED traffic Light circuit controls 6 LEDs (red, yellow and green) for both north/south directions and east/west directions. The timing sequence is generated using a CMOS 4017 decade counter and a 555 timer. Counter outputs 1 through 4 are wire ORed using....
The circuit features automatic Exit and Entry delays, timed Bell Cut-off and System Reset. It has provision for normally-open and normally-closed switches and will suit the usual input devices (Pressure Mats, Magnetic Reed contacts, Foil Tape, PIRs and....
You should notice that the opto-isolator LEDs are connected to three wires labeled "FWD", "REV", and "ENA*. " These wires deserve a bit of explanation. The FWD, REV, and ENA* lines are the interface between the bridge and the microprocessor. You will notice....
The security system application and program offers a simple demonstration of the BASIC Serial Interface. By adding only a few door and window switches, a transistor, a siren, (see schematic) and a few lines of BASIC program (see program listing) the....
This Nicad battery tester discharges the test battery at a rate of 500 mA. When the endpoint of 1 V (determined by set..
Electronic Door Release Circuit This circuit is designed to operate an electrical door-release mechanism - but it will have other applications. Enter the four-digit code of your choice - and the relay will energize for the perio....
Autotransformer voltage starting, starting time 30-60s adjustable. Figure, SDJ electrode liquid level sensor HJ-13-type, pump control system box with HKD-21B type, 1MK level mo..
As shown in FIG homemade wireless remote control circuit diagram; A motor remote road works Wireless remote control transmitter circuit As shown for the remote control transmit..
This small transmitter uses a hartley type oscillator. Normally the capacitor in the tank circuit would connect at the base of the transistor, but at VHF the base emitter capacitance of the transistor acts as a short circuit, so in effect, it still is. The....
For the shorter wavelength VHF and UHF bands it`s more practical to construct more complex antennas such as a single band Slim Jim or Yagis; I`ve had a go at a few such projects. Other projects will be an electronic unit of some kind: For the Intermediate....
Integrated circuit input side has a oscillating circuit,it`s oscillation frequency depends on external components L1, C1 and sensor`s equivalent capacitance, the latter size increases with liquid immersion. Oscillating signal add on the threshold switch....
The design is a clone of Steve Ward`s MiniSSTC circuit; the schematic is reprinted here with credits to Steve Ward: 9schem. jpg. This circuit performs very well for a low power and simple SSTC. My design is based on Steve`s final revised circuit that employs....
This simple electronic bicycle horn circuit uses only one gate of a 4093 quad 2-input NAND Schmitt trigger, U1, conected in a simple, low frequency, square....
This is designed to be used as a programmable LED display for numerous applications. I also wanted to include some additional features so that the display can be used instantly. The display uses a sure 8 x 32 LED dot matrix. This is interfaced to a Xino (or....
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....
In this project, you will make a simple 3-stage low-power broadcast-type circuit, using a crystal oscillator integrated circuit and an a collector modulated AM oscillator with amplifier. You can connect the circuit to the an electred microphone or amplified....
Circuits of this kind are intended to drive LED Arrays in order to create more visibility and conspicuity when a vehicle is stopped or stopping. This circuit, in particular, will emit a visual alerting signal of 4 short flashes, followed by a steady on light....
Although the IC has been replaced to a large extent this circuit, the flexibility of the circuit design of discrete devices still make it practical. The parts are readily avail..
The circuit monitors the input to the microprocessor 5 V regulated supply for voltage drops and initiates a reset sequence before supply regulation is lost. In operation, the resistor capacitor combination Rs and Cj form a short time constant smoothing....
Speed control is accomplished by pulse width modulating the gates of two MGP20N45 TMOS devices. Therefore, motor speed is proportional to the pulse width of the incoming digital signal, which can be generated by a microprocessor or digital logic. The....
The power supply varies, and the circuit must operate on under 10uA of current (not counting charging the cap). It triggers an SCR every 10-30 seconds as long as the power supply is above 1. 8VDC, and must operate across a range of 1. 8 and 7. 0 VDC. The....
A BA1404 IC is used to generate a complete FM MPX signal. The chip contains all of the necessary circuitry. CI and R3, and R4 and C4 provide pre-emphasis. The transmitter runs on a single AA cell. L3 is 3 turns of #20 wire on a Ke drill (for a form). L3 is....
this tone generator can be used to control your robot. you will need to use the tone decoder for this. to widen the range, higher or lower - substitute a higher, or lower valued capacitor for c1. for frequencies about 5khz and 15khz, use a piezoelectric....
This article describes the DDDAC 2000 Audiophile projects (1N4001). The content is very simple, very helpful. Components in this article can help you understand better understanding of this article. For example, in this article, you can go to find and buy....
In most countries it is now mandatory or at least recommended to have a rear fog light on a trailer with the additional requirement that, when the trailer is coupled to the car, the rear fog light of the towing car has to be off. The circuit shown here is....
The circuit is a LED driver which responds to ambient lightas wellas to the presence of any intruder, and varies its illumination accordingly, lets know more. Also I would like to have an ambient sensor to switch on and off and a proximity sensor to switch....
This audio distribution electronic project circuit diagram is designed using the TL064 or TL06 operational amplifiers and some other common electronic parts. ..
This simple counter is useful for frequency measurements of various wireless equipments, especially transmitters, receivers and signal generators in VHF/UHF band...
The amplifier drives a pair of loudspeakers using two LM3876 integrated power amp ICs (50 watts per channel), or a pair of headphones via a Meier crossfeed filter and an OPA2134 dual opamp. It provides four switchable line level inputs, and an unbuffered....
The ADM660 is a charge-pump voltage converter that can be used to either invert the input supply voltage or double it. The schematic below appearsADM660 Voltage Inverter Circuit Configuration Diagram. This inverting schematic is ideal for generating a....
My mobile rig, a Kenwood TM-D710E, needed a GPS receiver for APRS use. The GPS-710 wasn`t readily available and, besides, is quite expensive. I therefore decided to build my own. I found a Royaltek RGM-3600 GPS receiver on eBay for less than £20. This is a....
This circuit has a long and storied history - starting with an idea by Rich Piotter, then being honed and simplified by Wilf Rigter and Bruce Robinson. The final result does not show the necessary motor drivers (usually H-bridge based), but here`s the....
As shown for the TDA8350Q test circuit, the circuit is in the push-pull amplifier output terminal resistor as a dummy load testing alternative deflection coil. ..
NJM2268 is a dual Video 6dB Amplifier with 75 drivers for S-VHS VCRsHI-BAND VCRsetc. One channel has clamp function that fixes DC level of Video signal and another one is bias type. Furthermore it has 75 drivers to be connected to TV monitors directly and....
This is a handy, easy to build general purpose 50 watt amp. The amp has an input for a radio, TV, stereo or other line level device. It also has a phono input for a record player, guitar, microphone or other un-amplified source. With the addition of a low....
The sensor circuit is adaptable to different liquids and sensors. The constant-current source drives current through the sensing probe and a fixed resistor..
This Blog show the Different Electronics Circuit Design, Application, Fields and Resources which could help students, engineers, professionals, and common people whose interest is in electronics! For your comments, suggestions, or your looking for a circuit....
This is a simple and easy to construct digital dice circuit. The circuit is based on a single IC, CD4060B. The dice consists of six LEDs marked D1 to D6. The number of LEDs glowing indicates the numeral. The heart of this circuit is 14 stage binary ripple....
Power-supply controller has staggered voltage-output sequencing. Four voltage outputs turn on simultaneously for voltage tracking; two outputs for core and I/O supplies during power-up and two outputs for line driver supplies where tracking is not critical....
Bruco Integrated Circuits B.V. >> Case: Automotive alternator voltage regulator - Bruco....
IC1A op-amp is wired as an inverting amplifier, having its gain set by a three ways switch inserting different value resistors in parallel to R4. This input stage is followed by an active three-band tone control stage having unity gain when controls are set....
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....
As shown in the radio remote lighting switch with RCM1 type radio-controlled remote control transmitter and receiver components as a circuit. Circuit from RCM1A/B component for..
One of my backup systems uses a Magnum MS-PAE 4024 inverter, which doesn`t have any built-in fan controller. Since batteries give off hydrogen during both normal and equalization charging, it`s important to vent the batteries to the outside with a brushless....
This is a water sensor circuit design using based on a Conductive Liquid Level Sensor, this single chip circuit is very compact and simple. This circuit is an ac excited fluid level sensor, which uses alternating current to provide biasing for the sensor....
A signal-injection circuit for control-loop analysis is flat from dc to 200 kHz, isolated from chassis ground and easily constructed with a readily available instrumentation amplifier....
A prototype model of Agriculture Based Robot . Till recently the farmers were using age-old instruments in cultivating their lands. They themselves were putting the manuallabor. Hence there was thelabor problem. Farmer`s facing this type oflaborshortage.....
As per the note on the schematic IC-2 is a 74HC74 TTL chip, look up the data sheet and it will show you what pins 7 and 14 are. The note for IC-3 is down lower its an AC optocoupler part number MOC3041. D2 is noted as a 15volt. 4 watt zener diode, a part....
Although the modular Portable Mixer design available on these web pages has become a hit for many amateurs, some correspondents required a much simpler device, mainly for mixing mono signals. This design should fulfil their needs, featuring three inputs with....
Ni-Cd Ni-MH Adjustable Constant Current Battery Charger Circuit This is a Adjustable Constant Current Ni-MH or Ni-Cd battery charger circuit. It....
Dual power for each complex since load is supplied by means of two-way power Meanwhile, when the way in which the power outage, contact switches from closing movement, not by t..
The schematic requires few components, because the timer function has been incorporated by Nutchip. For once, from the start, made up of contacts of the relay RE1 connected to terminal M2. If we turn on an appliance at the end of time, we will use the relay....
A simple buzzer to convert to an oscillating buzzer so as to obtain the sound similar to that of an automobile`s reverse indicator. I`ve posted a schematic(borrowed from electroschematics. com) below. I intent to replace the LED with my buzzer and omit the....
This design is to achieve a long-distance wireless remote control switch lighting control system consists of two parts the transmission system and the reception system...
Make your own solar powered robot at home using things you probably already have. Transistors, resistor, capacitor, solar battery and flashing LED are available at any electronic store, if you don't already have them. Solar cells out of calculators work as....
Three circuit options Can be synchronized to Christmas tree flashing lights This circuit generates a dual-tone bells ringing similar to most door-bell units. It can be used in many applications other than door-bell. In the Notes below several options will....
Circuit works as follows: The electrical circuit is a light, a light electric sound conversion circuit with two simple fiber optic connector for experimental play is shown. f W..
This is a simple project circuit for 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 consume very little power. This is the figure of the circuit. This circuit is based on or....
A motorcycle or boat battery that is not needed over the winter is usually charged before being put away for the winter, after which it remains standing unused for months on end. As a result, it accumulates deposits of lead sludge, which can result in....
2003 The US Trade and Development Agency has increased the performance of the same pin configuration as the 2002 US Trade and Development Agency. In the United States Trade and..
Using MAX641 integrated circuit, manufactured by Maxim IC, can be designed a very simple step-up converter using few electronic components. This step-up high voltage converter electronic projects allows a maximum output current up to 1A. Low battery voltage....
An useful feature of this circuit is that the frequency can be changed by changing a capacitor value, a switch can be add to choose between various frequencies...
Neon lamp or tube lamp need high voltage to trigger the ionization of the gas inside the tube. After the ionization occurs, the voltage drops around 40 volts....
Shown for the precision digital timing control circuit. The controller consists of crystal oscillator circuit, a divider, counting circuit, monostable flip-flops...
Here is a simple circuit which can be used for decoration purposes or as an indicator. Flashing or dancing speed of LEDs can be adjusted and various dancing patterns of lights can be formed. The circuit consists of two astable multivibrators. One....
The IRF820 MOSFET has a voltage rating of 500v, it should work well in preamp stages of most tube amps. The 100 ohm resistor is there to suppress H.F. oscillations. If IRF820 is physically close to the 12AX7 plate, you probably won't need it. You can see how....
I built two secondary coils: Small coil D25.4/H119 (Diameter=25.4mm and Height=119mm) and Medium coil D73/H228. I experimented with the spark gap, and observed that a series spark gap is better in terms of power handling, noise, and spark discharge length.....
Hi there - i`m a newbie here so please be nice if I tread on any toes And please take a deep breath - I have a fair bit to say, so go get some popcorn ....
Using the OBD-II (On Board Diagnostics) protocol, we can read live information from a car`s computer with our NerdKits microcontroller kit, as explained by our guest star, Elena T. , MIT class of 2011. This uses the port under your steering wheel to receive....
PicCon is a PIC microcontroller based radio controller designed for hidden transmitter hunting. When combined with a radio transmitter, it will produce tone sequences and Morse code messages at user-programmed times. It is completely field programmable via....
autodyne n. A heterodyne radio device in which one tube serves simultaneously as oscillator and detector....
My product requires a voltage-controlled, current-limited power supply and for a number of years I have used various switcher chips with an op-amp to feed back a current sense voltage to the feedback pin. For the last couple of years I have been using an....
Nowadays, it is no longer necessary to use discrete components to build oscillators. Instead, many manufacturers provide ready-made voltage-controlled oscillator (VCO) ICs that need only a few frequency-determining external components. One example is the RF....
This is a discrete high current switch mode LED driver circuit. The basics of this circuit is a buck-converter principle. The efficiency of this circuit is 80....
This circuit is presented as an alternative to the IR beam break detector featured in the June 2009 issue (Silicon Chip). In order to make it relatively insensitive to ambient light, it uses a standard IR receiver IC such as the Jaycar ZD-1942. This has a....
AC contactor DC transformer circuit a run AC voltage regulator circuit operation DC contactors have a variety of types, ..
Not every new use of technology requires a microcontroller. This one uses a 12 volt computer fan from CompUSA, a snap close food box from Walmart, some PVC pipe from Home Depot, and a large plastic storage container from Big Lots.e food storage box whose lid....
Dispenser (Aucma) temperature detection control circuit It shows the dispenser (Aucma) temperature detection control circuit. The dispenser is composed of two parts, one part i..
Low power ( 3 to 30 MHz) transmitters constructed by hams are generally called QRP`s. For such transmitters a well tuned antenna is a must. If the impedance is not properly matched there will be a little or no output. But if properly matched there will be....
