tonefrequency detector circuit
This is a design circuit for tone/frequency detector (decoder) circuit that can be used to detect the presence of a signal with a certain tone. The output of th...
big e stereo parabolic microphone
This is a design circuit for a stereo amplifier for a high sensitivity stereo parabolic microphone. This circuit can be used for listening to distant sounds. Ty...
7 band audio graphic equalizer circuit
This is circuit for audio equalizer that is very common as commercial products (for Hi-fi, car audio and stage use) but circuits for them are very rarely publis...
intercom circuit using fader
This is a complete circuit that is shown in the diagram below and is formed by a microphone amplifier built around IC1A, is a design for intercom circuit. In th...
audio level meter circuit using lm3915
This is a simple design of audio level meter. This circuit uses just one IC and a very few number of external components. This circuit is based on LM3915 as con...
test beeper for audio amplifiers
The test beeper generates a sinusoidal signal with a frequency of 1, 000 Hz, a common test frequency for audio amplifiers. It consists of a classical Wien-Bridg...
stepped volume control
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50w audio amplifier using ic tda1562
The integrated output amplifier described in this article consists of little more than one integrated circuit. It is intended especially for use in motor vehicl...
100w quad car amplifier
This quad amplifier is actually intended to be used in a car, but it can naturally also be used for a variety of other medium-power applications. The TDA7375A c...
two tone siren in one ic
This circuit is called with two tone siren in one IC, this circuit is intended for children fun, and can be installed on a bicycle, car battery charger and a.....
audio graphic equalizer circuit
A gyrator is a circuit using active devices and transistors to simulate an inductor. In this case the gyrator is the transistor acting with R1, R3 and C2. It co...
birdie doorbell circuit
This is a design circuit for a doorbell. This circuit can produces a sound like bird sound. This circuit controlled by transistor NPN. This is the figure of the...
subwoofer filter circuit
This is a circuit of subwoofer active filter circuit is a 24 dB octave filter with a Bessel character and cutoff frequency of 200 Hz. So, if you are interested ...
3 band equalizer circuit
This is a circuit for a tone control using 3 band equalizers. This circuit is based on single chip op amps LF351. This circuit having three ranges, bass, middle...
circuit ultrasonic mosquito
This is a small circuit insect repellent, mosquitoes and birds, or other methods to produce high frequency audio signals. Interfere with the hearing of insects....
VU Meter Driver PCB Completed Board Stereo for 110898091550
VU Meter Driver PCB Completed Board Stereo for Two VU Meters Audio Amplifier. VU Meter Driver PCB Completed TA7318P Board Stereo for Two VU Meters Features : Sp...
fm stereo decoder
This part of my site features a stereo decoder circuit suitable for both my pulse counting FM Receivers and other types of FM Tuner, such as the old valve type ...
virtual saxophone
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output relay delay audio amplifier
This is a simple ambit which I congenital to one of my audio amplifier projects to ascendancy the apostle achievement relay. The purpose of this ambit is to asc...
sequencer
A sequencer used for music is a device that sequences musical events for predictable playback. For early electronic instruments these sequencers often take the ...