This 9 W amplifier with transistors from the 60's was found in documentation of the time. The output transistors must be mounted on heat radiators and the power supply is included.
We found this control circuit for three-phase motors used in the control of doors and gates in a...
This extremely slow circuit produces one pulse per month and can be used in a timer. We found it...
This circuit is from an American publication of 1977. The tunnel diode admits equivalents and the...