This Japanese commercial radio with 5 transistors is from the 60s and is powered by 6 V. It is a conventional superheterodyne configuration with good performance.
This circuit, for bands above 15 MHz, was found in an Argentine publication from the 1970s. The L1...
May 2017 - The new Wolfspeed 650 V Schottky rectifier diodes can now be purchased from Mouser...
The action of this circuit, found in a 1977 amateur radio documentation, is like to a delay line....