4-tube reflex (T1662E)

This circuit that uses a loop antenna was found in a 1924 publication. The circuit has several supply voltages and sets of audio and RF coils.

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Voltage Sensor (CB13307E)
This circuit, from an old publication from the 70s, can be assembled with a 2N2646 unijunction...
Center Tap Simulation with Diodes (CB4140E)
In the figure we show how two diodes can be used to simulate the center tap of a push-pull driver step....
100 Hz High Pass Filter with the 741 (CB11463E)
The circuit presented was obtained from an Electronics Now magazine from February 1995. The...