Quote:
Originally Posted by dazzlevision
The Philips unit is an N6502, originally with three dc output voltages: 6, 7.5 and 9V @ 250mA max. The mains lead into it is pluggable and the "hard wired" dc output lead is terminated in a "Roka" plug, with an adaptor to convert it into a 5 pin (270 degree?)DIN plug, that was fitted on many Philips portable battery only cassette recorders.
It uses a typical series regulator circuit, with a zener diode voltage reference. Transistors AC128 and AD162.
They are well made and seem to be widely available on auction sites, etc.
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Very well spotted, thanks. Yes it is an N6502 indeed, made by Philips in Holland. It was hiding inside the battery compartment of a Roberts RT1 and was being used to power the radio at the 6V setting. It has a dual mains voltage selector too. I have the circuit diagram for it in case anyone's interested.