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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40-Channel Sequential (CB17484E)
We found this circuit in a 1986 documentation. It causes 40 LEDs to flash sequentially. The big...
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Found in a National Semiconductor manual from the 90's, this circuit uses components of the time,...
Timers with Inverters (CB195E)
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