This circuit was found in an American documentation from the 90's. It switches a continuous voltage obtaining an AC voltage at the output of approximately 1 kHz.
Found in Motorola's 1968 power circuit manual, this circuit has a high input voltage and no...
The circuit shown in the figure can be used to detect vibrations or to provide amplified acoustic...
This circuit is from a1970 documentation. R1 may have 10k and P1 47k. The transistors can be BC558...