This circuit is from a Radio Electronics from October 1963. The transistor is a power transistor of the time, and two transformers are used. The input has 10k impedance and is powered by 12 V.
This receiver was obtained in a documentation from the 90's and is of the super-regenerative type....
IDT ZSSC3230 Capacitive Sensor Signal Conditioner Available from Mouser Electronics stock, this IDT...
This circuit, with a configuration like to many that we can find in this section, was suggested by a...