This commercial circuit is from a Japanese magazine from 1967. It uses germanium transistors, and the coil can be made with 80 to 100 turns of fine enameled wire on a ferrite rod.
The 8038 integrated circuit consists of a function generator with outputs of three waveforms. It...
This is a traditional CMOS configuration found in other articles in this section and on this...
This circuit is from the old RCA transistors manual of 1964. The transistor can be the BC558 and...