Reflex receiver with loop antenna (T1659E)

This 3-valve receiver was found in a publication by Edelman from 1924. The circuit has two supply voltages, B being 60 to 90 V.

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Precision Low Frequency 555 Oscillator (CB8088E)
Found in Electronics now, this circuit generates signals given by the formulas next to the...
5 A TTL power source LM340 (CB14256E)
This source was found in the National Semiconductor's Linear Applications Handbook of 1994....
Same Antenna for TV and FM (CB17479E)
This circuit is another practical idea for places where they still receive signals from analog TV. The...