Found in RCA documentation from the 1970s, this circuit uses currently unusual integrated circuits. The circuit is of the experimental type not tuned.
This circuit was found in an Elektor from the 90s. The integrated circuit is uncommon today. This...
This two input simple mixer uses two transistor and can b e upgraded to more inputs. Input...
This 100 kHz crystal oscillator uses 7404 to generate square signals. We found it in a Popular...