Posted by: eleccircuit | July 12, 2011

Music keyboard circuits

The work of the circuit this origin frequency sound circuit model astable multi vibrator. When build the circuit suits power supply the circuit will still don’t work. But if we press switch S1 the circuit will begin the work. By have current flow through R9 get along well with B of Q2, make Q2 begin the work before, then have current flow through SP1, R11 and LED1 at the same time…Source:Keyboard music circuit


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