Off-hook Telephone Indicator (CB5994E)

This circuit was found in a 1980s US publication. It indicates when the phone is off-hook by triggering an indicator.

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LM383 8W amplifier (CB10902E)
The traditional circuit was taken from a French magazine Radio Plans that no longer exists but can...
Astable 7400 (CB19315E)
This astable TTL with the 7400 integrated circuit appears elsewhere in this section. This version is...
TPIC2010 Motor Drive controlled by Serial Port (COM022E)
June 2016 - It can be obtained from Mouser Electronics this new chip for motor control, motion,...