Repository-circuits
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As transformer a toroidal transformer (2x12V 15VA) is used, because this gives much less energy losses then an E-I core transformer as used in the original mains adaptor (for more info, click here )... -
The following is one of the most rare and special documents here at the DigiBarn, the only known copy of the complete schematic specification of the 512K Macintosh Logic Board. Daniel Kottke co-authored this design which served as the basis for the 64K.... -
This Programming interface circuit sends the programming signals from the USB cable to the FPGA chip directly, through a standardized 10-PIN interface. Technically there are only 4 or 5 signal pins used, excluding GND and unused interface pins from the.... -
I am planning on doing an s-video and rca jack mod on my Genesis. The mods I see done seem to all use the headphone jack as the source of the stereo sound. Is this the only way? I would prefer to have the output not be controlled by the volume slider. Is it.... -
One day I bought an old pong console from an old lady at a flea market. When I got back at home I hooked it up to the TV But the problem was that I didn`t have the AC adapter for it So I took C batteries to insert them in the console but when I removed the.... -
We will bypass the mechanical snooze switch on top, and instead turn the alarm clock off in a much more fun way: punching it! Hopefully along the way I will be able to teach you some techniques that are useful in reverse engineering, so you can apply them to.... -
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The concept behind the light dimmer is to control the voltage to the light lamp or any source. Light dimmers regulate the voltage to the source they are connected to. This regulation of voltage increases or decreases the light intensity. Light dimmers first.... -
In electronics, a digital-to-analog converter (DAC or D-to-A) is a device for converting a digital (usually binary) code to an analog signal (current, voltage or electric charge). You can use DAC for testing circuits and amplifiers or for generating the high.... -
An L7805 provides a 5v rail. The input and output of the reg is bridged by a 470 F and a 10 F capacitor respectively to try and smooth things out a bit. The 5v rail created by the L7805 then powers the MAX232 level shifter and the GPS module itself. Thee.... -
This circuit uses a synthesized sound chip from Holtek, the HT-2811. This reproduces the sound of a ""ding-dong"" chiming doorbell. Additionally, the circuit includes a CMOS 4026 counter display driver IC to count your visitors.... -
A diagram of an active loudspeaker. The LF353 of, National Semiconductor, is going to split audio signal into three bands. SANYO LA47536 is going to amplify these signals. In stereo mode, we shall have the action of eight high speakers who are going to.... -
A hifi preamplifier designed to convert high output impedance amplifiers to 600 ohm outputs.... -
A high quality microphone preamplifier using a single power supply, suitable for dynamic or electret microphones.... -
An electronic version of a chirping canary. May be used as an alarm, a sound effects generator or perhaps a replacement doorbell.... -
This Mark3 version of the Infra Red extender is a special version designed to control appliances that use high frequency modulated IR remote controls.... -
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.... -
A low frequency test oscillator for testing tone controls and experimenting.... -
An electromagnetic field probe designed to detect changing electric and magnetic fields.... -
This circuit can measure both small signal hfe and DC current gain hFE of a low to medium power power transistor.... -
Using a single 7812 IC voltage regulator and multiple outboard pass transistors, this power supply can deliver output load currents of up to 30 amps.... -
This is a simple but reliable device based one of the oldest integrated voltage regulators of them all - the LM723.... -
A 12 Volt high current 20 Amp power supply. The output voltage is variable from 12.2 Volt to 14.4V so can be set for any device requiring voltage and current in that range. This PSU uses an LM723 as the regulator, 4 parallel connected outboard pass.... -
A Short Wave Receiver based on the MK484 (formerly ZN414) that includes the tropical bands and 49 metre bands.... -
This is the circuit that sparked off all the other Link Telephone Intercom designs. Originally designed back in 1996 with heavy duty relays and their contact banks, it was updated late last year with the addition of IC1 in place of a simpler transistor.... -
The circuit you are about to see is the culmination of some effort at improving the basic Link intercom design. You may think that pulse dialing is `old hat` nowadays, but the exercise of building and testing the Link `P` in this format, and understanding.... -
This is a great intercom circuit that can be used in many ways. It uses 22V to operate and maybe it will work at a lower voltage (you can try it). For input/output it uses a loundspeaker (20-45 Ohm) on each side...
New Circuits
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This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of.... -
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is.... -
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to.... -
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This.... -
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the.... -
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,.... -
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the.... -
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power.... -
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
Popular Circuits
The Link circuitry is simple and efficient, employing just two ICs, half a dozen transistors, and...
This is probably the simplest radio transmitter that you will find anywhere. It has a total of...
This circuit is that the traditional tungsten filament lamp amplitude regulator is eliminated...
The 555 on the right is wired as an alarm sound generator and the second 555 timer on the left is...
FM Wireless Microphone Schematic. In some applications, the use of the microphone cable is...
The Microchip PIC 16C84 was one of the first serial in-system programmable microcontroller. I saw...
This document describes a Rife Beam-Ray system which was designed and constructed using the...
Its a high quality FM receiver circuit based on IC CXA1019. CXA1019 is a monolithic silicon...
The circuit in the diagram was originally designed to monitor an oscillator, but can also be used...
If 40 watts RMS from 20Hz to 30KHz +/-1. 5 db sounds good to you, then you might enjoy this...
The goal is to freeze different stages of some fairly quick process (at least when compared to...
As shown using MIC5156- is a composition having a current limiting function, and a lot of high...
As shown for the simple differential amplifier circuit. Two input signals Vi1 and Vi2...