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 QST from the 90's this circuit is suitable for the medium and short-wave range. |...
The circuit shown in figure 1 consists of an Inverter Module for CCFL Lamp that can be supplied with...
This circuit is based on the voltage reference that is uncommon today MC1403. Equivalents can be...