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 time base circuit for the oscilloscope was obtained from an Electronics Now from the 90s. The...
This relay time delay circuit was found in the October 1993 issue of Electronics Now magazine. The timing...
RF or even switching transistors like the 2N2222 can be used in this circuit. The capacitors are ceramic...