We found this circuit in an old American documentation, but the circuit can still be assembled with ease as the used components are still available. MOSFETs admit equivalents.
We found this 5-digit circuit in a 1990 publication. The displays are of a common cathode and the...
This symmetrical power source for currents up to 1 A was found in a 1986 documentation, serving...
This circuit was suggested by Sprague Electric in an 80's documentation. The circuit uses a...