Dual tube receiver (T1600E)

This receiver employs two dual triode valves. Receiver is from a 1949 Radio Electronics. Power supply not provided.

Genera-Purpose Alarm (CB10326E)
This simple circuit was obtained from Popular Electronics in December 1990. The magazine no longer...
Sound receiver (CB8231E)
Indicated by a 90s Popular Electronics, this circuit amplifies acoustic signals for analysis on an...
Stable VFO (CB4050E
) This variable frequency oscillator was found in an old American documentation. Transistors allow more...