Found in an ancient American documentation, this circuit can generate signals up to 40 MHz for a Z80, microcontroller widely used at the time. The circuit must be powered with 5 V and also serves as a shield.
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...