Are there any cheap options for a Better Touch Power Supply?

[JohnSwenson]

I gotta get new glasses! :-)

How about adding a LED for power on indication? Would that effect the output in any way?

I also have a beautiful 8VAC output R-Core transformer from Japan. Apart from having to drop the output voltage a bit, where do you think the differences would be (measurement-wise) if I used something like this?

8VAC is too low for this circuit. Unless its two 8V windings, which you could put in series. This would work, but you would need a bigger heatsink.

An LED is fine, it wouldn't change anything.

I love R core transformers, where did you get it?

John S.

[tonyptony]

I had a couple of them custom made for some other work I had to do. One is left over. It's been such a long time that I think it's 8VAC out. it might be 10. I'll have to check the documentation, assuming I can find it!

[KeithL]

Maplins sell a regulated linear power supply with variable voltage. I used one with a SB3 for a couple of years. Its nearest variable voltage is 4.5v. My SB3 didn't notice a 0.5v drop.

[Amauta]

If anyone is interested I have two Power-One 5V/3A power supply's. I used them for my SB2's, and do not need them anymore. If you are interested contact me with a PM please.

They have 220 Volt configuration but can also operate at 120 Volts.

[psp]

Following the advice of Wayne at Boulder Cable (the thread is on Audio Circle), I bought a refurbished Elpac WM220-1 (5 and 12VDC, rated at 22 watts!) for $46 plus shipping. I spliced in a plug that mates with the Touch, otherwise I've done no power supply mods so far (the WM220 is very open and the circuit board accessible, so mods will be easy). Apparently some WM220s can buzz, but mine did not... buyer beware!

I never know what to expect with something like this, and most of the time I do it from a "more beef in the power supply can't hurt" point of view, but this time the results were quite nice. The dominant effect was clearly increased dynamics. With the Touch driven by the Elpac, instrumental attacks had a sharper edge and the music was more fun and engaging; driven by the stock supply it was more polite, more recessed, less interesting. There may also be more inner detail with the WM220, but to date (to my ears, with the music I've listend to so far, etc.) the effect is not large.

Peter

[tonyptony]

I spliced in a plug that mates with the Touch

Peter, do you have a part number for this?

[kgturner]

Peter, do you have a part number for this?

switchcraft 502-760

http://www.mouser.com/ProductDetail/...Wd4VeTPXD68%3d

[psp]

Tony,
I used the same plug as kgturner suggests, the Switchcraft S 760, Digikey P/N SC1051-ND. I paid $3.44; it's a nice part.

Good luck,
Peter

[tonyptony]

Thanks to you both!

[adamdea]

Do you think one of these might work? Obviously it requires termination
http://uk.rs-online.com/web/search/s...duct&R=2243962