Top Circuits Page 273
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This USB car charger circuit adapter from car cigar socket project is a DC DC power converter that safely converts the 12V car battery voltage into stable 5V. This circuit can be used to supply power from a car cigar lighter socket to a por....
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This circuit is used to simulate the police car lights by alternating flashing strobes seen on British police cars. The IC1a forms a square wave oscillator having adjustable frequency with VR1 to give the best effect. This square wave is bu....
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AC mains operated single LED flasher circuit, built using the popular CMOS timer chip TLC555 is shown below. The whole circuit is powered directly by the grid supply of 230VAC through a capacitive potential divider and associated components....
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Here is an ultra simple automatic light switch circuit for bedrooms. After construction,connect the input terminals of this circuit in parallel to the internal buzzer terminals of a Quartz-Alarm Clock. When the clock alarm is activated at a....
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This is a simple update to Mr. Hareendran s PIR Sensor Security Light circuit. It has a shortcoming limits the relay voltage to approximately 3.3V. While this may function with some 5V relays, it will not function with all. The nature of....
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Using this simple circuit, you can make an 18 LED flasher to decorate the X`Mas Tree. The White, Blue and Red LEDs flash at different rates to give a colorful display. It is a light sensitive circuit so that it will turn on in the evening Using this simple....
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This diagram is certainly the 6 transistor Tilden H-bridge circuit; while not as old as the original basic H-bridge, this goes way back, and will be the basis for a lot of BEAM driver circuits. Bruce Robinson explaination about this circuit....
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The following diagram is the schematic of simple easily tuned / adjustable sine and square wave oscillator. This circuit provides sine and square wave at frequency of below 20Hz up to above 20KHz. The benefit of this circuit diagram is that....
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A multivibrator is an electronic circuit used to implement a variety of simple two-state systems such as light emitting diodes, timers and flip-flops. The monostable multivibrator will create a condition: in which one of the states is stabl....
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This is a DC motor controller circuit, built using transistor TIP31 based on H-Bridge concept. The switch S1 and S2 are normally open, push to close, press button switches. The LED function is to indicate the direction of motor rotation, y....
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This is the schematic diagram of DC motor speed controller circuit. The circuit applies two oscillators/timers which are connected as a Pulse Width Modulator (PWM). The timer chip which applied in this circuit will be an nmos dual timer/osc....
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Here the long range/distance Infrared transmitter circuit, give you extra power for your Infrared transmitter. The majority of the IR remotes do the job reliably within a range of 5 metres. The circuit complexity increases in case you desig....
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This is a low-cost and simple intercom circuit design. Some intercom circuits is build by applying integrated circuits. The circuit described right here utilizes 3 certainly transistors which easy to find on the electronic store. Even a new....
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This is the circuit diagram of a voice operated relay. It similar with sound activation switch circuit which will turn on and turn off (connect and disconnect) the switch depending on the sound input. The output switch of this circuit is ac....
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Here is the remote control tester circuit. This circuit is really a simple and easy tester for verifying the basic operations of an infrared remote control unit. ..
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This diagram is the schematic diagram of telephone switcher using relays. This device connects to the telephone line and can be used to remotely control up to 4 relay outputs using a DTMF (tone dialing) telephone. A number of user settings....
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This a two station intercom. It uses two wires to run between each intercom unit. Each is self contained with its own battery, speaker, microphone and amplifier circuit. An LM386 audio power amplifier is used. It is widely available, used a....
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This is the circuit diagram of USB powered computer speaker, or it widely known as multimedia speakers for PCs. The circuit has single-chipbased design, low-voltage electrical power supply, compatibility with USB power from computer, simple....
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Switchable Output Crystal Oscillator Circuit This oscillator circuit permits crystals to be electronically switched by logic commands. The circuit is best understood by initially ignoring all crystals. Furthermore, assume that a....
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Two-Tone Siren Circuit Schematic Using One IC Circuit This circuit is intended for children fun, and can be installed on bicycles, battery powered cars and motorcycles, but also on models and various games and toys. With SW1 pos....
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Using this circuit diagram, can be designed a very simple AC voltage converter, which converts the 240V AC power to a voltage of 110V. Circuit can be successfully used to power electrical devices that require a supply voltage of 110V. If su....
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This is another 100watt inverter circuit diagram. Built based on IC CD4047 and Mosfet IRF540, this inverter have ability to supply electronic device -which require 220VAC- up to 100w from 2-3A transformer....
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High Voltage Stun Gun Disclaimer: As i have seen before, IT IS NOT A TOY, DON`T DO ANYTHING STUPID WITH IT. I DON`T ACCEPT ANY RESPONSIBILITY OF DAMAGES DONE TO OTHER PEOPLE OR YOURSELF WITH THIS DEVICE. IF YOU WANT TO BUILD IT YOU MUST ACC....
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Low Ripple Regulated Power Supply Circuit Diagram This circuit may be used where a high current is required with a low ripple voltage (such as in a high powered class AB amplifier when high quality reproduction is necessary ). PARTS LISTR12....
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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 can be used to get a constant current power supply. Here is the schematic diagram of the circu....
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The circuit described here is of an economical smooth variable power supply which offers 0V to 24V. It provides all controls and short circuit protection with acceptable regulation and a ripple free supply and yet uses very few components. The circuit....
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The following diagram is the FM transmitter circuit with FM transmision up to 4W. Voltage supply for this circuit is 12-16V with current consumption of 100-400mA. This circuit works with frequency of emission range of 88-108MHz. Components....
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This is a low cost and easy build low powered FM transmitter. The range of the FM transmitter claimed about 300 feets when running at 9V supply. And the range claimed to be increased become about 400 feet when running it at 12V supply. Take....
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PARTS LIST C1 0. 22 µF (224) C2 22nF (223) C3 10nF (103) C4 27pF C5 22pF C6 3. 3nF (332) C7 180pF (181) C8 330pF (331) C9 3. 3nF (332) C10 150pF (151) C11 82pF C12 68pF C13 220pF (221) C14 100nF (104) C15 330pF (331) C16 220pF (221) C17 1. 5nF (152) C18....
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The following file is an application note describing the two stages of electronic ballast for a 250 W HID metal halide lamp. The components include....
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The following file contains detail info about design of Clock Oscillator Basic Circuit Diagram. Included in this file information about: selecting the....
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The following circuit diagram shows the application of LM117 on High Current Adjustable Regulator. The LM117, is capable of supplying in excess of 1.5A over a....
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The DIAC, or diode for alternating current, is a trigger diode that conducts current only after its breakdown voltage has been exceeded momentarily. Most DIAC....
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A crowbar circuit is a power supply protection circuit that rapidly short-circuits ("crowbars") the supply line if the voltage and/or current exceeds defined....
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The following schematic shows the JFET- Bipolar Cascode Circuit Diagram. The JFET- Bipolar cascode circuit will provide full video output for the CRT cathode drive. Gain is about 90. The cascode is a two-stage amplifier composed of a transconductance....
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A biquad filter is a type of linear filter that implements a transfer function that is the ratio of two quadratic functions. It is available in low pass, high....
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A crystal radio receiver is a very simple radio receiver which needs no battery or power source and runs on the power received from radio waves by a long....
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The following schematic shows a Crystal Radio Receiver Circuit Diagram with AF Amplification using a Germanium Transistor. The addition of AF amplification will....
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The TDA2005 is class B dual audio power amplifier package specifically designed for car radio application. You can easily design car radio power booster....
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The following schematic shows the Simple Op-Amp Radio Circuit Diagram taken from bowdenshobbycircuits.info. This Simple Op-Amp Radio is basically a crystal....
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The following schematic shows the Simple Motorcycle Alarm Circuit Diagram designed and drawn by Ron J. It uses micro-switches to protect removable panels and....
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The following schematic diagram shows the 12 Volt Car Lamp Dimmer Circuit Design using 555 Timer. This circuit design can be used to dim a standard 25 watt....
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The following schematic shows the Relay Wiring Circuit Diagram for controlling an Air Conditioner or other higher high-current device from a microcontroller....
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Wiring 2-Wire Intercom. According to Wikipedia, an intercom is a stand-alone electronic communications system intended for limited or private dialogue....
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The following schematic depicts the design of a 4 Watt Amplifier Circuit Diagram for portable radio application using TDA1011 from Philips Semiconductor. The....
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SHURE is an American corporation produces consumer and professional audio-electronics manufacturer of microphones, phonograph cartridges, discussion systems,....
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Circuit breaker is an electronic devices which function is to protect an electrical circuit from hazard/damage due to overload or short circuit. This car....
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Motorola VWA63 Auto Radio is an automotive type all-transistor superheterodyne AM radio for standard broadcast reception. The following schematic illustrates....
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There are several sections in this website that you should read regarding track wiring. This section on track wiring, Part I, covers general wiring information, testing, and troubleshooting. Part II contains the actual wiring of track. The menu to the right....
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This is a 7 tube 20 watt amplifier that must be used in conjunction with a pre amplifier having volume an tone controls. For this, I recommend this 6 tube pre-amp. With this amplifier you may use 6BQ5 output tubes. A 5U4-G rectifier is used so that the power....
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If you want to omit this balance control, such as when using separate pots for the volume controls, see the balance control notes on the 7-tube output amplifier page. "Wes, I used the schematic posted on your site, and built this. modified slightly with....
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The LED moving font is built up of separate modules consisting of 64 LEDs each (8x8 matrix). The modules can be cascaced according to the desired size of the font. Each module is controlled by the LED display driver MAX7219 (or MAX7221) which can drive 64....
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Level refers to the relative strength of the signal and is measured in decibels. LINE level sources are much-amplified signals over MIC (microphone) level signals. Line level is usually between -10 to +4 dbm in strength while MIC levels are normally -60 dbm.....
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Connect serial cable with serial port and if you are using USB to TTL or RS232 or serial converter then plug it to the USB port. Now after this short pin Tx with Rx or pin TxD with RxD using any wire like jumper wire on other side. Now open serial port....
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This is the current schematic for the Boost converter. The negative power is connected to the emitters and LED cathode. With the values shown, the circuit draws about 18 mA and drives the LED to 5 mA or so. Higher input voltage, up to 3 volts assuming white....
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Had bought this EDE702 some time ago, and a LED-backlit LCD character display. After buying the EDE702, I considered that it did not provide enough integration with HD44780-compatible displays to justify its price. Nevertheless I should use it, as it would....
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An audio mixer to which all the receiver audio outputs go, which is described here. The audio mixer`s output is amplified and drives a common speaker. So I hear all the radios (that are turned on) through that one speaker. This is fine as far as it goes.....
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Because of this audio mixer, I can compare the various receivers just by twiddling the gain controls. No switching required. Makes A/B comparisons a snap. (They are all driven by the same antenna). All of this used to be easy I just used a different speaker....
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The world`s first practical crystal amplifying device, in 1948, and the dawn of the commercially available Transistor Radio in Britain. If I had been an average radio enthusiast or constructor at that time then I would have been coming to terms with the new....
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This article provides a detailed description of our methodology for testing power supplies in three major parts. The first one lists PSU parameters we check out and specifies the test conditions. In the second section you`ll find terms often voiced by PSU....
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This circuit shows the use of the XCSB servo library to control 4 RC servos. The demo runs on a 16f628 using the internal 4MHz oscilator. It uses 1 push button to select between servos and 2 push buttons to change the selected servos position. A 16x2....
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This page exists as a repository for items you may need to consult from time to time, such as identification guides, diagrams, etc. There is also a project in the works to make the S130 fiche easier to navigate and find what you`re looking for. You`ll need....
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The Z3816A is a GPS disiplined timing source that was manufactured by HP in the middle 90`s. It was intended for use in cellular telephone equipment. It provides 10 output signals through sma connectors on the back panel. 1 PPS - from the 4 connectors on the....
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I will be using the bike eventually for quite long trips, off roading at night and dual sport riding, so the bike needs good headlamps, indicators and an accessory socket. To this end, I fitted the bike with a 12v 10AH battery, on two custom lugs welded to....
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In order to take a high speed photograph one must either have a very fast shutter or light source. We followed the latter course and first examined an commercial flash unit to determine its light profile. This was accomplished by exposing a phototransistor....
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This circuit lets you keep the appliances plugged into your inverter. It won`t make the wind blow or the clouds go away, but it will keep your batteries safely charged even if you have a generation shortfall. I call it the Grid Charger Voltage Switch. The....
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This is a successor of the PIC16C71 4-digit LED f-counter & V-meter. Some hard to find parts used in the previous version, which are out of production for some time, has been omitted. A rather early PIC16C71 has also been replaced by 28-pin device PIC16F876.....
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the finger, inside a light screen, between an high intensity led emitter and a photocell, provides the heartbeat signal, which, suitably amplified, is used as input for a microcontroller PIC16F84. Three 7 segments common cathode displays, drived by the PIC,....
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An 8-bit password is the input to this system. The password entered by the user is compared with the actual password (password set in the microcontroller using the microprogram) by the microcontroller. The result of the comparison process is an 8-bit output....
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The original firmware is usable on the amateur radio bands, but is not very convenient to use. Wulf-Gerd, DL1FAC has developped a new firmware that is much more "ham-friendly". It is open source. With this firmware you can change the frequency as you like,....
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The purpose of this page and its sub pages about members of Z80 family (and close relatives) is to collect and share information and good ideas. I know there are lots of people out there, who have developed some good utilities and hardware solutions. Now we....
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This result puts the oscillator in the middle of the UK FM Band (87. 5 - 108 MHz). If L1 has an adjustable ferrite core then its inductance can be altered and fine tuning acheived. If L1 is an air spaced coil then fine tuning is achieved by physically....
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This is a complete alarm system with 5 independent zones suitable for a small office or home environment. It uses just 3 CMOS IC`s and features a timed entry / exit zone, 4 immediate zones and a panic button. There are indicators for each zone a "system....
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This alarm system has 6 independent zones, 1 timed entry/exit zone, a 7 segment LED display and a test or walkthrough facility. Suitable for a small office or home environment, it can also be adapted to use a combination lock or keypad to set and reset the....
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These are two - easy to build - relay-based alarms. You can use them to protect your motorcycle - but they have many more applications. If you use relays with 6-volt coils - they`ll protect your "Classic Bike". Both alarms are very small. The completed....
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This is a single zone alarm - with independently adjustable Exit, Entry and Siren Cut-Off timers. It will accommodate the usual types of normally-closed input devices - such as magnetic-reed contacts, foil tape and PIRs. If you wish - you can use a mains....
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This section contains intruder alarms for your home, car and motorcycle, power failure and water level alarms and even a snore detector. All circuits are listed alphabetically on the Circuit Index page and in date order on the update page. All contributors....
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This is a simple SCR based burglar alarm circuit. Its features include automatic Exit and Entry delays - together with a timed Bell cut-off and Reset. It`s designed to be used with the usual types of normally-closed input devices such as - magnetic-reed....
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Using a single op-amp this easy to make equalizer offers three ranges, low frequency, mid frequency, and high. With component values shown there is approximately +/-20dB of boost or cut at frequencies of 50Hz, 1kHz and 10kHz. Supply voltage may be anything....
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Both transistors should be low noise types. In the original circuit, I used BC650C which is an ultra low noise device. These transistors are now hard to find but BC549C or BC109C are a good replacement. The circuit is self stabilizing and will set its....
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A high quality microphone preamplifier using a single power supply, suitable for dynamic or electret microphones. The op-amp used can be any low noise, high performance type, e. g. NE5534, TL071, OPA 371 etc Nothing too special here. The schematic is shown....
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When listening to music at low volume levels, bass and treble frequencies are attenuated more than mid frequencies. This loudness control alters the frequency response curve to correspond roughly with the equal loudness characteristic of the ear. The circuit....
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This is a special low voltage version of my audio preamp. T1`s emitter voltage is biased close to half supply voltage (1. 5V) to allow for maximum output voltage swing. Both transistors are direct coupled and have closed loop feedback to aid temperature....
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At first glance this circuit looks fairly complex, but when broken down, can be divided into high pass and low pass filter sections followed by a summing amplifier with a gain of around 20 times. Supply rail voltage is +/- 9V DC. The controls may also be....
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Using minimum component count; this simple circuit will indicate peak audio response on an analogue meter, similar to a tape recorders meter. The circuit uses an op amp as a non inverting amplifier, but with one addition - a diode in the feedback loop. The....
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This is a four channel amplifier ideally suited for use with quadraphonic equipment such as a Sound Blaster Live card. There is no volume control, audio levels being directly controlled from the sound card itself. Construction is straight forward and is....
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Although the TDA2030 is capable of delivering 20 watts of audio power, I deliberately reduced the output to about 8 watts to drive 10 watt speakers. This is more than adequate for a smaller room. Input sensitivity is 200mV. Higher input levels naturally will....
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This is a circuit where a microphone and preamp circuit (voice circuit) have priority over any other audio signal. You can think of this as a one way intercom, if the main amplifier is used for listening to music, then when the push to talk switch is....
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A circuit to extract and measure the modulated carrier of an Infra Red remote control. Note that the circuit does not physically separate control pulses from modulation, but amplifies the completereceived signal allowing the waveform to be displayed ideally....
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The PC parallel port can be easily damaged by wiring mistakes, short circuits or the circuits you connect to it. If the parallel port is integrated into the motherboard, as is the case with most computers repairs can be expensive. You can buy inexpensive I/O....
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This circuit is a modified version of an original interface on QSL Net. It is a fully isolated interface allowing computer control of the Trio/Kenwood R5000 receiver. Separate software is needed to control the receiver. The R5000 receiver is an all-mode full....
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This circuits allows you to use a cheap loudspeaker as a microphone. Sound waves reaching the speaker cone cause fluctuations in the voice coil. The voice coil moving in the speakers magnetic field will produce a small electrical signal. The circuit is....
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This circuit consists of two identical intercom units. Each unit contains a power supply, microphone preamplifier, audio amplifier and a Push To Talk (PTT) relay circuit. Only 2 wires are required to connect the units together. Due to the low output....
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It`s well known that many animals are particularly sensitive to high-frequency sounds that humans can`t hear. Many commercial pest repellers based on this principle are available, most of them operating in the range of 30 to 50 kHz. My aim was, however, to....
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This circuit is a modified hartley oscillator with a couple of extra components included. The transformer is a small audio transformer, type LT700. The primary is center tapped with an impedance of 1Kohms at 1KHz. The secondary has an impedance of 8 ohms.....