This high-Q low-pass filter was found in the October 1990 issue of Radio Electronics magazine. The frequency depends on the capacitors used and is on the order of a few tens of hertz.
Found in a General Electric documentation from 1970, this circuit consists of a relaxation...
This two-transistor output stage source currents up to 100 mA to a load using the 2N3906, but can...
We found this circuit in a 1966 US documentation. It simulates a variable capacitor that can vary...