This power stage with two transistors was found in Radio Electronics magazine from October 1963. The transistors must be equipped with heatsinks and the supply voltage is 12 V.
This common operational PLL circuit was found in a Popular Electronics 90’s. The power supply need...
This circuit found in a 1988 documentation, uses a piezoelectric or crystal capsule as a...
We found this circuit in a Radio Electronics issue from July 1969. The lamp remains on until C1...