Flip Flop 4027 (CB25120E)

This circuit was suggested by an article in the April 1988 Radio Electronics magazine. The flip-flop is of the JK type.

Tone Generator MC3556 (CB14592E)
The integrated circuit used in this configuration is equivalent to the common 555, but double. The...
9 W amplifier (CB18562E)
This 9 W amplifier with transistors from the 60's was found in documentation of the time. The...
Programmed amplifier (CB7129E)
This digitally programmed gain amplifier was obtained from Signetics documentation from the 1980s....