This circuit was found in the January 1980 issue of Radio Electronics magazine. It is a digital slot machine using common logic circuits. It can still be easily assembled today.
This circuit was found in a 1977 Radio Shack documentation. The unijunction transistor can be...
Other series amplifiers such as the MC3301, MC3401 and LM2900 can be used on this circuit. We...
This circuit offers excellent sound quality for headphones of 150 ohms or more. The circuit was...