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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Circuit for Observing Hysteresis (CB13953E)
We found this circuit in an old oscilloscope publication. With it, it is possible to observe the B...
Fast adder 1 (CB7055E)
We found this circuit in an Electronic Engineering from the 90s. It applies to any logical family....
13.6 V x 1A Power Supply (CB13633E)
This circuit is from a documentation for 1976 radio amateurs. We can implement this circuit with...