This circuit is from a Radio Electronics from March 1970. The crystal depends on the frequency at which the signal is to be captured and the resonant circuit determines the tuned band.
This power supply can supply voltages from 3 to 9 V and is very useful on the bench. The maximum...
This 1.6 to 20 V power supply, with a maximum current of 3.5 A and protection against short...
This circuit is from a publication from the 70s. The original text was kept. The medium...