Found in a QST magazine from the 90s, this powerful unit is intended to supply a VHF transceiver for the 144 MHz band with 1.2 kW of power.
This analog thermometer was obtained from an English documentation. The sensor is a common diode...
Found in Popular Electronics from the 90s, this 1.5 A power supply can supply voltages selected by a...
This circuit was found in Radio Electronics magazine from February 1962. The sensor is an LDR, and the...