Telephone line interface (CB8659E)

Found in a 90s Popular Electronics, this circuit allows Interfacing electronic applications with the telephone line.

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Power indicator (CB7255E)
Indicated by Popular Electronics to be used with a car headlight, this circuit can also have...
1 000 Hz Colpitts Oscillator (CB3922E)
In this circuit of a 1970s publication, data from the coil to oscillate at the desired frequency...
Comparator with Transistors (CB6550E)
This circuit was obtained from a Philips documentation from 1968. The transistors can be replaced...