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metronome circuit – Circuit Schematic
metronome circuit
The figure shows an easy project / schematic of a metronome. A metronome is a device that is used by musicians. The circuit produces continues beats in the spea...
intercom circuit using lm386 ic – Circuit Schematic
intercom circuit using lm386 ic
The circuit mentioned here is a small easy to build Intercom circuit using one LM386 IC one 2N3904 transistor and few other components. LM386 is a very famous a...
Siren sound generator circuit with UM3561 – Circuit Schematic
Siren sound generator circuit with UM3561
The circuit we are going to discuss here is a four siren sound generator using UM3561 IC which is a low power CMOS IC. The four different sounds can be produced...
door bell circuit – Circuit Schematic
door bell circuit
Here is a very simple project of a door bell circuit. The heart of the circuit is UM66 melody IC which is a great and very famous melody IC, comes in TO-92 tran...
beeper circuit – Circuit Schematic
beeper circuit
Here is a schematic of a beeper circuit. The circuit will generate a continuous beep-beep sound signal with flashing an LED.....
audio preamplifier – Circuit Schematic
audio preamplifier
Now day`s audio signal preamp is used in many electronic devices. There are many types of audio preamp circuits from simple to complicated big circuits. Here we...
555 organ circuit – Circuit Schematic
555 organ circuit
Here is a schematic of a simple 555 organ circuit. The circuit is consist of two parts first 555 circuit of organ and second lm386 amplifier for driving 8 ohms ...
5 band graphic equalizer circuit – Circuit Schematic
5 band graphic equalizer circuit
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telephone amplifier – Circuit Schematic
telephone amplifier
While talking to a distant subscriber on telephone, quite often we feel frustrated when the voice of the distant subscriber is so faint that it is barely intell...
soft musical telephone ringer – Circuit Schematic
soft musical telephone ringer
The normal telephone bell, at times (specially during night when one does not want to be disturbed), appears to be quite irritating. The circuit shown here conv...
cuckoo sound generator circuit schematic – Circuit Schematic
cuckoo sound generator circuit schematic
This circuit generates a two-tone effect very much alike the cuckoo song. It can be used for door-bells or other purposes thanks to a built-in audio amplifier a...
bells ring generator circuit schematic – Circuit Schematic
bells ring generator circuit schematic
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 s...
cuckoo sound generator – Circuit Schematic
cuckoo sound generator
This circuit generates a two-tone effect very much alike the cuckoo sound. It can be used for door-bells or other purposes thanks to a built-in audio amplifier ...
two tone siren circuit schematic using one ic – Circuit Schematic
two tone siren circuit schematic using one ic
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...
one ic two tones siren – Circuit Schematic
one ic two tones siren
This circuit is intended for children fun, and is suitable to be installed on bicycles, battery powered cars and motorcycles, but also in models and other games...
ultrasonic dog whistle – Circuit Schematic
ultrasonic dog whistle
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 princ...
whistle responder – Circuit Schematic
whistle responder
Some 15 years ago it was common to see small key-holders emitting an intermittent beep for a couple of seconds after its owner whistled. These devices contained...
quality stereo wireless microphone or audio link – Circuit Schematic
quality stereo wireless microphone or audio link
This stereo FM wireless microphone also makes a great quality audio link. We tested it to beyond 50 meters and it was rock solid. It s certainly not the first w...
ir music transmitter and receiver – Circuit Schematic
ir music transmitter and receiver
Using this circuit, audio musical notes can be generated and heard up to a distance of 10 metres. The circuit can be divided into two parts: IR music transmitte...
automatic loudness control circuit schematic – Circuit Schematic
automatic loudness control circuit schematic
In order to obtain a good audio reproduction at different listening levels, a different tone-controls setting should be necessary to suit the well known behavio...