DTMF Decoder (CB25048E)

This circuit was found in the 1987 Radio Electronics magazine. The components used are integrated circuits of the time.

| Clique na imagem para ampliar |

9V neon lamp driver (CB7863E)
Found in a 90s Radio Electronics, this circuit is intended to drive a neon lamp from a 9 V source....
Transistor tester (CB20677E)
This simple tester was found in a Popular Electronics from the 90s. The circuit is powered by two...
Signal conditioner (CB8958E)
Electronics Now from the 90's suggests this pulse conditioner circuit for use in tachometers. The...