Modulated Crystal (CB7931E)

This circuit allows modulating the signal generated by a crystal oscillator. The circuit is from the 80s RCA linear integrated manual.

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Delayed SCR trigger (CB19336E)
The circuit shown is from an old European publication. In it we have the way to activate a relay...
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We found this circuit in a European publication from the 1990s. Transistors are still common types...
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