Today we have more compact solutions. This is from a Radio Electronics magazine from October 1990. It uses the technology of the time.
The FAN1117A and FAN1117A-5 integrated circuits from Fairchild consist of fixed and adjustable...
This circuit was found on an 80's Ham Radio. The transistor admits equivalent. The circuit can...
This sensitive receiver with earphone was found in an English documentation from 1963. The...