I found tis circuit in na old documentation from 1958. The circuit uses germanium transistor availble that time and hard to obtain today. The circuit is indicated for phono applications using variable reluctance transducer.
This circuit generates trains of pulses in regular intervals determined by R1 and C1. The...
This circuit was found in a 1977 Radio Shack documentation. The unijunction transistor can be...
In the figure we show how to use a varicap to modulate a signal in frequency. The circuit can be...