5 LED Log Scale with U257B (CB25442E)

The circuit was found in the February 1992 Radio Electronics magazine. The scale can be changed by changing R2 and R3.

Alternating Signals Operational Amplifier (CB19324E)
This circuit was obtained in an old European documentation. The integrated circuit used is...
Fluorescent Lamps Test (CB18603E)
The presented circuit is used to test ordinary fluorescent lamps. This circuit also has a mains...
Volume Expander (CB24739E)
Used in radio reception, this circuit was found in the February 1983 Radio Electronics magazine. The...