Time Base (CB25100E)

This time base circuit was found in the January 1988 issue of Radio Electronics magazine. The output signals are 1 Hz and 10 Hz TTL.

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Pulse Width Discriminator (CB5159E)
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Busy Line Indicator (CB18711E)
This busy line indicator is very simple, serving for analog lines. The supply is made by two...
Simple Multimeter (CB9880E)
This simple circuit uses a 200 uA microammeter of the type found as VU, being able to measure...