Dialing detector (CB9304E)

This circuit was found in GE documentation from the 90s. The circuit can be used as a shield for telephone lines.

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Sinusoidal buffer (CB9555E)
This amplifier for a sinusoidal function generator uses a 741 integrated circuit. The circuit is...
Tone control TL071 (CB15306E)
This circuit is from Motorola's Linear Interface ICs of 1993. The circuit can be powered by...
Irrigation Pump (CB18084E)
This circuit is from 2005 documentation. It automatically starts an irrigation pump when the...