This circuit is from a 1990 Philips Databook. The circuit uses a symmetrical source and power from 15 to 40 V. Performance information is given in the table below.
This circuit for VCR recording heads was found in the February 1990 issue of Radio Electronics magazine....
This very simple continuity tester uses a small 1.5 V lamp (type used in flashlights). Can be...
This commercial radio with 3 earphone listening transistors was manufactured in Japan in the...