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.
This bargraph-type circuit employs a not very common integrated circuit today, but can be adapted...
May 2017 - This new Ricoh 4 A current device is now available from Mouser Electronics. The device...
This modulator circuit can be used in AM transmitters up to about 10 W of power. The TDA2002 must...