On Mon, 17 May 2010 09:57:09 +0100, Arfa Daily wrote:

Hi all

Anyone happen to know the value of the resistor in the CR network
connected in the synchronous motor feed ? Looks like brown - red - brown
so 120 ohms, but it's well overheated and discoloured, with a nice burn
mark right around the spiral element, right in the centre. Can't get a
reading from either end to the burn point. Looks at a guess to be rated
about 3 -5 watts. Anybody think of a reason *not* to use a wirewound
rather than the original metal film type ?



Ah! A bit more research... The voltage dropper resistor on early P3s was
12k, with a 2.2uF phase shift capacitor. Later P3s used a 2.2uF class X2
capacitor instead of the 12k resistor. As I said before, the winding
voltage works out at about 80v when run on a 230v supply.


--
Mick (Working in a M$-free zone!)
Web: http://www.nascom.info
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