[sdiy] Roland TR-909 PSU and reset circuit, replacement

[Adam Inglis]

The transformer in my TR-909's PSU has gone, and I can't seem to find  
a suitable replacement (it's chassis-mount, and is the sole physical  
support for the PSU PCB), so I'm thinking of replacing it with a SMPS  
if I can find a suitable size, maybe something like this one...
http://www.mean-well.com.au/shop/product.php?id_product=74
to give me the required +/- 15 volts and +5 volts.

Questions:

1) Given that the 909 is mainly analogue, would a SMPS introduce more  
noise than a linear supply into the voice circuits?

2) The AC connection is two prong, would I need to convert this to  
three for a SMPS?

3) The 909 has a little reset circuit on the PSU, which holds the  
reset line low until the input of the 5 volt regulator sees 7 volts -  
could I safely ditch this if changing to a SMPS ?

Reset circuit details can be viewed here..
http://www.adambaby.com/images/tech%20pics/909PSUreset.html

4) Do I need an external fuse with these things?

Sorry for the no-doubt-dumb questions, and thanks in advance!




regards
Adam Inglis
http://www.adambaby.com