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.
The L200 integrated circuit consists of a 5-terminal current regulator in a TO-22O enclosure that...
Figure bellow shows another configuratíon for a Iow-frequency sine wave oscillator using CMOS...
This circuit is from a Radio Electronics magazine from August 1976. The module used is from that...