Simple pulse extender (CB8921E)

This TTL pulse stretcher or stretcher was found in a 90's EDN. The time constant R x C1 determines the widening of the incoming pulse.

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Frequency detector 556 (CB20900E)
The 556 integrated circuit is a double 555. The heats of the components depend on the frequency and the...
Tunnel diode clamp (CB9401E)
This circuit was found in a 1966 American publication. The critical component is the tunnel diode. ...
Complete FET Test (CB19255E)
This circuit is intended for the testing of junction FETs, providing several reading options...