This sophisticated circuit was found in the November 1978 issue of Radio Electronics magazine. Based on CMOS logic, it has several types of timing, controlling the wiper relay.
This circuit uses half of the LM158 operational double but can be used in the series as the LM258,...
This circuit generates audio tones in a speaker with controlled frequency and volume. The...
This circuit was obtained from an article in Radio Electronics magazine in October 1966. It...