Reflex receiver with loop antenna (T1659E)

This 3-valve receiver was found in a publication by Edelman from 1924. The circuit has two supply voltages, B being 60 to 90 V.

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Insulated dialer (CB9464E)
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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)
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