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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Direct shield for triac (CB5185E)
This shield circuit was found in an American publication from the 80's. The triac is of low...
Variable Frequency Oscillator (VFO) (CB13087E)
The Variable Frequency Oscillator (VFO) shown in the figure can generate signals in a frequency range...
Sinusoidal descrambler (CB6198E)
This circuit was obtained from an 80's Radio Electronics. The circuit decodes “scrambled” or...