9V power source (CB21164E)

This simple circuit with a 5V regulator was found in an American documentation from the 90's. The output voltage is adjusted in a trimpot.

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High Voltage Regulator (CB14323E)
The circuit shown was found in the National Semiconductor's Linear Applications Handbook of 1994....
Telephne Audio Interface (CB21269E)
This circuit from a Popular Electronics shows how to take the audio signal from a telephone line...
Capacitive discharge ignition (CB24182E)
This circuit is from a Radio Electronics from April 1972. The circuit uses power transistors of...