Various Circuits
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This circuit turns-off an amplifier or any other device when a low level audio signal fed to its input is absent for 15 minutes at least. Pushing P1 the device is switched-on feeding any appliance connected to SK1. Input audio signal is boosted and squared.... -
This is an evaluation use of a small graphics LCD module. Last summer, SG12232C graphic LCD module has been sold sold for 1500 Yens from Akizuki Denshi and I bought it. However I could not find good application for the LCD module and it was going to go to.... -
This device is a stereo amplifier for a high sensitivity stereo parabolic microphone. It can be used for listening to distant sounds. The Big-E can be used with headphones or as an audio source for a stereo tape recorder or a PC sound card. This circuit also.... -
This project is an experiment of the Digital Signal Processing with a cheap microcontroller instead of an ordinary digital signal processor. Recent 8 bit microcontrollers have sufficient processing performance so that they can be used for simple audio signal.... -
Elecret microphones have a small electret melement and FET amplifier built to same case. Electret microphones needs some power to operate. The power (typically 4-10V) is fed to microphone through resistor (typically 1-10 kohm). The electret microphone.... -
This small amplifier was intended to be used in conjunction with an electric guitar to do some low power monitoring, mainly for practice, either via an incorporated small loudspeaker or headphones. The complete circuit, loudspeaker, batteries, input and.... -
This mini audio amplifier will test the audio stages in amplifiers such as the front end of FM bugs. You can also use it on lots of our other projects as well as the output stages of radios. It is a very handy piece of test equipment and will make a perfect.... -
The MP3 player is a new kind of portable audio player. It will be shipped simultaneously from many audio makers in the early part of 2000, and will start a new generation of portable audio. I have omitted a general description of the MP3 player and format.... -
I recently prototyped a Tube Screamer type circuit to refresh my memory about the sound of this pedal. I used a borrowed TS-808 and a Pro Reverb in the mid 80s for several weeks while my modded Twin Reverb was being fixed and I remembered it sounding pretty.... -
After attempting to use this reportedly "pretty good" microphone in a variety of situations with some "pretty bad" results, I dissected the power supply and found the same audio transformer that`s in their 180-in-one project kits! This DAT-Heads Digest.... -
This circuit is useful for removing ground loop hum on a remote line level audio signal line. It can be used to to connect a computer sound card to a stereo amplifier`s line input. Other uses include tapping into a line level signal for powering a remote.... -
Not so much a real project as a field day for experimenters, this article describes the methods you can use to tailor an amplifier to a specific driver. Much is empirical (i.e. design by experiment, trial and error), and although formulae are possible, the....
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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
This circuit is a frequency meter, low cost. It covers region 1HZ until 1MHZ. The IC1 schmitt...
Numbered components are so designated for PC-board layout purposes. C5 and C8 are disc ceramic....
The ECM circuit consists of four sections, as shown in the block diagram. A power converter...
Small digital design using a Xilinx picoblaze softcore processor, and I`m finding that producing...
TDA7560 is a 4 x 50 watt quad bridge car audio amplifier. The inputs are compatible with TDA7560...
The circuit was meant to be powered by a power supply, which is why there is no transformer,...
The Voice Changer has two different inputs, the microphone and the switches. The Voice Changer...
As shown in FIG constituted by INA217 professional miniature microphone (microphone) typical...
Automatic alarm circuit includes a DTMF Automatic dialing, password control circuit, voice...