Transformerless Wideband Switch (CB6457E)

We found this chopper circuit in a 1967 publication. The transistors are of the time, and current equivalents can be used.

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Battery Low Indicator (CB4796E)
This circuit triggers the LED when the monitored battery voltage drops below 9 V for 12 V...
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Suggested by National Semiconductor, this circuit can be applied to almost any operational...
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This circuit was found in Radio Electronics from the 90s. The circuit can generate signals up to...