This transistorized stage has a high gain, being adjusted by VR1. The circuit can be used as an excellent audio preamp. We found this circuit in a 1996 English publication.
This is the project found in a 1981 publication, but it is still viable. It is a simple AM...
This 2-quadrant modulator circuit was found in the May 1988 issue of Radio Electronics magazine. The...
Found in Radio Electronics from May 1959, this transistor tester is quite sophisticated. The...