This circuit has a gain of 6 dB for low frequencies from 85 Hz and can be used in a mini subwoofer. The circuit is from a Radio Electronics from March 1990.
This timer was found in a 1994 Electronics Now. The relay must be a sensitive type. If it has a...
Published in the September 1973 issue of Radio Electronics magazine, this diagram may be useful to...
This circuit with 4 diodes was found in the July 1984 Radio Electronics magazine. The voltage of...