Featured in the February 1949 Radio Electronics magazine, this benchtop instrument generates multi-range audio signals. The circuit has 6 tubes including the rectifier.
This is one of the many versions of amplifiers with LM386. This was achieved in an old publication (1981). The...
The figure shows how to generate a sinusoidal signal using 4 flip-flops. The circuit is from a...
The integrated circuit, in this 1986 application, is not a very common component today. The...