Isolation Transformer (CB25795E)

With a mains-rated transformer and 1:1 winding this benchtop circuit was found in the January 1995 issue of Electronics Now magazine.

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Reflex receiver with speaker (CB20567E)
Found in a 1963 documentation, this circuit employs germanium transistors of the time. Transformer and...
Tuned Ultrasonic Receiver (CB24920E)
In the figure we have a way of receiving ultrasonic signals of a single frequency using a PLL 567....
Phase Shift Oscillator (CB14952E)
This traditional circuit generates a 200 Hz sinusoidal signal. The frequency depends on the...