Negative Feedback Stage (CB6131E)

This circuit is from a 1967 US publication. The configuration can serve as a basis for designs with modern components.

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Insulated dialer (CB9464E)
This circuit was found in an 80's Electronic Engineering. The circuit uses a multivibrator with...
Cascading the 4029 (CB179)
Figure bellow shows how many 40293 can be cascaded. The input CI of the first circuit is grounded. The...
Optical logic gate (CB7257E)
This circuit is from Motorola documentation, but can be implemented with virtually any...