This receiver, called Peace, was manufactured in the 1960s in Japan and was powered by a 9 V battery. The radio for medium waves had an earphone and good sensitivity.
We found this circuit in an American publication from the 1990s. The triac must be equipped with a heat...
This TTL circuit uses LED indicators and must be powered by a voltage of 5 V. The capacitor...
This circuit uses an integrated CMOS having the frequency determined by the resistors and...