First pulse preserver (CB9259E)

This circuit was found in a 1967 EEE. The components are from that time, but the circuit can be implemented with modern equivalent components.

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Linear switch using FET (CB6919E)
Found in a 1967 Electronics World, this circuit can use any modern equivalent FET. Observe the...
400 Hz variable Q filter (CB7565E)
Found in American documentation from the 90's, this circuit applies to other operational...
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This circuit was obtained from the February 1992 Radio Electronics magazine. In it, a bar of 4...