Date   : Thu, 18 Jan 2007 13:29:16 +0000 (GMT)
From   : tim.fardell@... (Tim Fardell)
Subject: Batteries in a Master

On Thu, 18 Jan 2007, Richard Gellman wrote:

> Mine has a diode and a resistor in series. The resistor I can sort of see
> for voltage adjustment.. but the diode does baffle me slightly... unless
> its some sort of "back-EMF" protection.

Isn't there a charging circuit on the Beeb board, and the diode is to 
prevent this attempting to "charge" the alkaline battery pack?