RS Flip Flop (CB8925E)

This circuit was found in a 1969s American documentation. With modern components, it can be used as a shield.

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Transistor Stethoscope (CB18835E)
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We found this circuit in an old American documentation. The table gives the values of the...
11 to 32 MHz amplifier (CB22024E)
Found in an old English publication this circuit uses a dual gate MOSFET. Coils not specified....