Xpantastic!

--- In xpantastic@yahoogroups.com, "Karl" <shire03@...> wrote:
>
> Hello Steve,
> 
> I have a M12 service manual. And yes, the schematic is slightly 
> different from the xpander. I have taken a high res photo of it and 
> will send it over to you. The service manual does not have a parts 
> placement sheet. So as soon as I get my M12 open. I will send one 
of 
> the PSU. 
> 
> Best Regards
> Karl

Many thanks, Karl (and Tony too) - that's exactly what I needed. I 
know where the extra diode needs to go now!

If anyone else was wondering, it turns out that the M-12 PSU is 
pretty much a beefed-up version of the Xpander design with separate 
+12V and -12V regulators for each voice board. The -5V rail also gets 
its own winding on the transformer rather than being derived from the 
unregulated -12V.

Best regards,

Steve

Steve Lenham
Benden Sound Technology
www.bendentech.co.uk/sound