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 test instrument was found in the April 1991 issue of Radio Electronics magazine. The circuit has...
This circuit was found in an English publication from the 70's. The circuit requires symmetrical...
The OC30 power transistor is an old type of germanium from the 60s. This amplifier, using this...