This is the analog part of the previous circuit with the pressure sensor for the altimeter. The circuit is from a Radio Electronics from October 1990.
This circuit, from the 1977 GE semiconductor manual, uses a unijunction transistor beyond the...
Using a small speaker as a microphone, this 10-LED circuit was found in the March 1992 issue of...
We found this good power amplifier with the LM12 integrated circuit in the March 1989 issue of...