Telephone dialer (CB9235E)

This circuit was obtained in Radio Electronics from the 90s. The integrated circuit is uncommon today.

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Power Failure Alarm (CB6116E)
This circuit, suggested by an Electronics World of 1969, keeps a blinking LED for a while when a...
Soldering Iron Bench (CB17059E)
This simple power reducer, based on capacitive reactance, was found in a 1995 documentation. The...
3 to 35 V with 4 A power supply (CB4332E)
We found this source with the CI 723, common at the time, in a 1989 paper. Power transistors must be...