This circuit is from a 1974 publication by Motorola. The unijunction may be 2N2646 and bipolar BC558 and BC548. The pulse duration depends on the capacitor.
This circuit was obtained from a Radio & Electronics Constructor from March 1976. The magazine no...
The coil of this receiver consists of 100 turns of wire 38 to 30 in a ferrite rod and the...
This preamplifier circuit for turntable cartridges was found in the March 1994 issue of...