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.

Stereo Headphones Amplifier (CB982E)
The circuit presented in the figure is an amplifier for stereo sources with the Maxim MAX9723...
Analog Capacmeter (CB3930E)
This circuit has been found in an old American documentation, but can be easily implemented with common...
1 MHz Low Pass Filter (CB4833E)
The integrated circuit used in this filter is not very common today, but the reader can use...