This circuit was obtained from an American technical manual from the 80's. The integrated circuit is an operational of the time that can be replaced by a modern equivalent.
In the figure we have the typical configuration of a sinusoidal audio oscillator with twin-T. The...
This electronic game was found in a 1996 documentation, but it can be easily assembled today, both...
This circuit is from an August 1984 Radio Electronics magazine. It monitors the state of a RAM...