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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Soft Start Regulator (CB15498E)
When establishing the voltage at the input of this regulator, the output voltage rises smoothly until...
Impedance Matcher for Audio (CB793E)
This circuit is used to match a high impedance input source with a low impedance output device...
12 V Sequential (CB16373E)
This circuit is from a 1982 documentation. Here we have an adaptation of the circuit already...