Audio and video switch (CB8512E)

This circuit was obtained from a 90s Radio Electronics. The integrated circuit used HAA11508 is not a common component today.

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General purpose RF detector (CB8484E)
Found in a 90s English documentation, this circuit consists of an RF detector for testing in RF...
Shutdown for exhausted battery (CB8387S)
When the 24 V battery voltage drops below 18 V, this circuit cuts off its discharge. The circuit...
Audible warning (CB9204E)
This circuit that generates a special sound was found in a Popular Electronics from the 90s. The...