Using a DAC038 IC this circuit is from Radio Electronics from May 1983. The circuit must be powered with a 5 V source and uses common operating outputs.
This simple expandable circuit was obtained from a Popular Electronics from the 80's. The supply...
This traditional configuration found in a Radio Shack document can use 2N2646. More keys can be...
This circuit was obtained in an Argentine publication in 1976. It consists of a series voltage...