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.
We found this 3-transistor receiver in the July 1970 issue of Radio Electronics. The transistors may be...
The integrated circuit used in this detector is uncommon today. We found it in a documentation from the...
We found this Japanese commercial radio diagram of three transistors in a documentation of the...