Pocket Tube Radio (T1621E)

This sensitive 4-tube, battery-powered receiver was found in a 1949 Radio Electronics. The circuitry was wired in crystal earphones.

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Low Resistance Meter (CB12193E)
We found this circuit in a 1981 publication. Its purpose is to measure resistances of very low...
Beep For Flasher (CB4340E)
This circuit adds a beep to turn on with car flashers that do not have this feature. A 47 ohm to...
Bench Test Circuit (CB24741E)
This simple test circuit was found in the April 1983 issue of Radio Electronics magazine. The...