This circuit was obtained from HAM Radio magazine in an 80's issue. The FETs are types of the time and the frequency is determined by the crystal. The circuit operates at voltages from 3 to 9 V.
We found this transistorized radio for the AM band in a Japanese publication from 1960. The...
This small source is suitable for low consumption equipment that uses batteries. The circuit is...
Found in a magazine 73 for radio amateurs, this circuit has two settings, one for the interval and the...