This circuit is from a 1980s Motorola documentation. The circuit can be made with modern equivalent components. The original circuit is for the 115 Vac (110 V) grid and has two settings.
This sophisticated filter for audio signals was found in Radio Electronics magazine. The...
This TTL circuit is from a Radio Electronics magazine from February 1973. The circuit must be...
A circuit in which the light turns on smoothly and goes out quickly, but which can be adjusted more...