Two-tube regenerative receiver (T1595E)

This circuit is from a Radio Electronics from 1949. The circuit is battery powered and has high impedance listening.

Monostable TTL 74121 (CB17573E)
In the figure we have the way to obtain a monostable TTL based on 74121. The circuit appears in...
Battery Charger as Power Source (CB11529E)
With good filtration, a battery charger can be used as a power source. The filter shock can be the...
10 kHz Oscillator (CB21804S)
This oscillator has an output power of 20 mW. We found it in a Mullard transistor manual from...