Low Pass r Sallen Key Filter (CB6939E)

This filter was found in Radio Electronics, and its configuration can be applied to any operational. The frequency depends on the components used.

Magnetic Microphone Preamplifier (CB25694E)
This circuit was found in the March 1994 issue of Electronics Now magazine. The circuit uses a...
3-tone Unjunction Oscillator (CB3849E)
Depending on the key pressed, this oscillator produces a different tone, set in the corresponding...
555 High Voltage Generator (CB25842E)
This very low current circuit was found in the April 1995 Electronics Now magazine. The frequency...