This 1974 circuit uses two 555 integrated circuits in a very traditional configuration. The circuit can be powered by voltages from 9 to 12 V and for greater volume an amplifier stage can be added.
This Japanese radio is from the 60s, presenting excellent sensitivity and an output power of 100mW...
Found in Radio Electronics from the 90s, this circuit is based on the 555 directly feeding a small...
Found in 80's Electronic Engineering, this circuit can tune the frequency to be rejected. The power...