Code Switch (CB6536E)

We found this circuit in a Popular Electronics of the 80s. Used integrated circuits are uncommon today.

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Darlington Modulator (CB14800E)
This modulator circuit for transmitters was found in American documentation from 1964. It can be...
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We found this circuit in a 1970 publication by General Electric. The components can be changed...
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Found in a Popular Electronics from the 90's, this circuit makes use of an integrated from the...