This low-frequency sine wave oscillator was found in the December 1995 issue of Electronics Now magazine. The two-transistor circuit is a Wien or Vienna bridge operating at 1 kHz.
Found in a 1967 Electronic Design, this transistorized circuit compresses and then expands a pulse....
This squelch is activated by its own noise, acting automatically. It is used in communications...
This is the battery-powered version of the previous circuit. The circuit is from the same Radio...