Remote thermometer (CB9487E)

We found this circuit in a 90s Linear Technology documentation. The circuit uses components from the time and the indicator is of the analog type.

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Rain Alarm (CB12620E)
The sound produced by this circuit, from a 1978 publication, depends on the humidity between the...
555 Fixed Period Generator (CB25498E)
In a September 1992 Radio Electronics article, we found this basic 555 circuit used to generate fixed...
High Speed Coupler Shield (CB6034E)
This circuit is suggested by Motorola, using a 4N26 type coupler and an MC1733 type operational....