Found in a 1970s documentation, this mini-organ toy circuit makes use of an integrated circuit from that time. This component is difficult to obtain today.
This is the conventional astable configuration of the 555 integrated circuit already explored in...
The maximum current of this circuit can reach 500 mA with BD136 and 1 A with TIP32. The circuit...
This circuit was found in a 1980s technical documentation. It tests the inverse characteristics of a high...