The transformer in this power supply can have a secondary winding from 1 to 15 A of current. Voltage is given by the zener diode. Transistor 2N3055 must be mounted on a good heat radiator.
This logic probe was found in a Popular Electronics from the 90s. The circuit is TTL and must be...
The integrated circuit used in this configuration is not common today. The zener determines the...
The original frequency of the Pierce Oscillator with bipolar transistor is given by the crystal, which...