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 was found in a 1980s documentation. Q1 and Q2 can be BC548 and SCR a TIC106. The...
This circuit is from an 80's publication. The basic components indicated are of the time, mainly...
This interesting multivibrator was found in an Italian magazine that no longer exists. This is...