Busy Line Indicator (CB18711E)

This busy line indicator is very simple, serving for analog lines. The supply is made by two batteries and the transistors admit equivalents.

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Comparator with AND gate (CB9407E)
This tunnel diode circuit was found in American documentation from 1966. The tunnel diode is the...
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This simple blinker for incandescent lamp was obtained from an English documentation. The power...
Parallel Port Insulated Buffer (CB15663E)
This circuit is ideal for the design of interfaces and shields, as it allows total isolation of...