We found this circuit in the November 1985 issue of Radio Electronics magazine. It uses TTL technology and has binary inputs. The circuit must be powered by 5 V.
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...