Telephone amplifier (CB8630E)

This circuit uses a pickup coil to take the signal from a telephone line without contacts. The circuit is from a 90s Popular Electronics.

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Conductive Touch Switch Alarm (CB6442E)
We found this circuit in a Popular Electronics of the 90s. The circuit uses a touch sensor formed by...
Car safety system (CB8959E)
Found in a 1980s American documentation, this circuit is based on the common CMOS series...
Video Fadder (CB4915E)
This circuit for analog video signals was obtained from a Linear Technology documentation from the 1990s. The...