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.
Found in a Popular Electronics - January/February 1969 this circuit was intended to increase the...
We found this circuit in an old documentation. It has a thermally compensated voltage reference. The...
This good quality stereo amplifier was found in a Japanese publication from the 1960s. The circuit...