Free circuit schematics - wiparat.com

A circuit surround sound simple.Circuit is created newness of the sound to a wider sound dimension.That the device R and C, to share the audio delay.
To get a new sound dimension.
When the switch S1 to select a location signal.The audio will pass to the surround speakers and left and right.The C1 and C2 act to [...]

Toy Organ By IC Timer 555
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The second circuit simulates the siren of an American police car. It uses two 555 timers in the circuit. The 555 on the right is wired as an alarm tone generator and the second 555 timer on the left is wired as a low frequency astable timer which generates a ramp waveform of about 6 [...]