This midrange filter for sound systems was found in the May 1988 issue of Radio Electronics magazine. The circuit is based on a dual amplifier that must be powered by a symmetrical source.
Found in a RCA manual from the 1960s, this circuit uses components from that time. It can generate...
We found this circuit in Ferranti's 1974 transistor manual. The components are from the period. Note...
The CMOS 4046 integrated circuit is not very common today, consisting of a very efficient PLL for...