| This ingenious touch switch is operated, not by skin resistance or capacitance effects, but by heat. The circuit utilises the neg...
| This ingenious touch switch is operated, not by skin resistance or capacitance effects, but by heat. The circuit utilises the neg...
| This ingenious touch switch is operated, not by skin resistance or capacitance effects, but by heat. The circuit utilises the neg...
| The frequency counter design published in the November 1975 issue of Elektor was accompanied by a design for an input preamplifier (Ele...
| Most tuners with varicap front-ends require two supply voltages. One for the front-end and i.f. amplifier {usually about +12 V) and a t...