This commercial signal follower was found in a 1967 Japanese magazine. It uses germanium transistors and provides a speaker output without the need for a transformer.
This oscillator for sinusoidal signals uses a lamp as a stabilizing element. We found it in the...
The circuit shown consists of a simple tester for general purpose silicon or germanium diodes and...
This configuration is from an old Motorola publication from the 70s. In it we have the way to...