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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High Q Filter (CB25362E)
This 1/2 hertz high selectivity filter was found in the December 1990 issue of Radio Electronics...
Two Current Boosters for Stepper Motor Controls (CB11598E)
The two power steps below are intended for use with the SAA1027 stepper motor control but can be...
Mexican Siren (CB17515E)
This interesting circuit, found in a 1986 publication, includes a powerful audio amplifier. Being...