This stereo meter-indicator was found in the August 1971 issue of Radio Electronics magazine. The transistors are known types and BC548 equivalents can be used.
This amplifier provides 20 W of power on each channel, containing separate filters to power a...
In the figure we show how to expand the count from 18 to 26 with 4017 CMOS integrated circuits. The...
This is a circuit published in the patent section of the April 1961 Radio Electronics magazine. The...