Current Booster (CB6973E)

We found this circuit in a Popular Electronics from the 90s. Transistors can be modern equivalents. Observe the high supply voltage.

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Astable Neon (CB10504E)
I found this circuit in a Popular Electronics from November 1999. The magazine is no longer...
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This tunnel diode circuit was found in American documentation from 1966. The tunnel diode is the...
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