Multimeter protector C (CB8383E)

Found in a 1966 Electronics World, this circuit applies to the protection of any analog instrument. The diodes can be of any general-purpose type.

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Magnetic resonance current limiter (CB8685E)
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Simple MW Pocket Radio (CB938E)
This simple radio uses few components due the direct coupling of the transistors. Coil is formed...
XOR Gate (CB4812E)
In the figure we have the way to implement an Exclusive OR or XOR gate with CMOS or TTL...