This small transmitter appeared in the March 1989 issue of Radio Electronics magazine. The two-transistor circuit used an electret microphone and had a range of a few dozen meters.
We found this circuit in the September 1992 issue of Radio Electronics magazine. It can be...
This circuit adds an amplifying transistor that can supply loads of up to 250 mA. The circuit is...
This circuit was found in a 1964 Electronic Design. The transistor may be a current equivalent of...