We found these circuits in a 90s Radio Electronics. In them, we have the way to turn a load on and off using pressure switches. The circuit can be used with other types of direct current load.
This circuit was found in a 1987 edition of the United States' Hands On Electronics magazine. The...
This simple circuit can be used to power a simple communication system using ordinary telephones....
Other series amplifiers such as the MC3301, MC3401 and LM2900 can be used on this circuit. We...