Although it uses a dual-channel FET, which is hard to find today, this circuit was released in a Radio Electronics issue in April 1986. It serves as a signal booster for a wide range of frequencies.
This circuit can use both separate LEDs and a common cathode display when one segment indicates...
The first transformer is a driver found on transistor radios and the second a small output...
Signals of up to a few tens of kilohertz can be generated by this circuit found in a European...