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.
We found this circuit in an English publication from 1982. The transistors can be the BC548. We...
This circuit was found in a 1965 Radio Shack documentation. The transistors are from that time....
The amplifier shown can either excite a speaker in this low power version, or its input step can...