This 6-transistor radio was sold in Japan in the 1960s. The super-heterodyne circuit for the OM band was powered by ordinary batteries.
This circuit was found in the February 1983 issue of Radio Electronics magazine. It is a 4-digit...
This filter that can use any operational was found in a French documentation from 1982. The power...
This dimmer constrols the temperature of a wire used to print images in wood or other materials....