Pulse Divider (CB6604E)

This circuit was obtained from documentation from 1968. The transistors used as well as the tunnel diodes are of the time.

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RAM Backup (CB24835E)
This circuit is from an August 1984 Radio Electronics magazine. It monitors the state of a RAM...
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In the figure we have the way to obtain an adjustable constant current source of 2 mA. The...
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Found in a Maxim publication from the 90s, this circuit generates signals from 10 to 25 kHz with a...