Are those really the same value caps? WOW
Whats' the wiring for your power supply? I was originally wanting to use batteries, but I haven't been able to find anything to fit the bill.
The schematics don't have a power supply, but it should be pretty easy to replicate.
Sorry, not the PS, but by the 15,000uf caps, a trace on the board was removed and something else was changed. I should have taken a picture when the board was free of film caps.
Mine looks pretty similar to Mike's, Jake. I've got the top off and my caps don't have elephantitis, I'd be happy to take a couple pictures of it if it would be of help.
My transformer's much smaller and only has 2 leads going in and 2 going out. Other then that it looks to be the same.
Thanks but don't worry about it. It's easy enough to throw an 18v transformer on there with a rectifier, or just a regulated wall wart. :D
Would I be able to use a 20000uF cap in place of the 15000uf filter cap?
The 26000uF is smaller and cheaper and still meets voltage spec.
One of the caps is a filter, so bigger is fine. The second 15000 uF is part of a voltage divider and can still be replaced with a bigger one.
But who doesn't like Big Blue? :D
(But I'll probably just use the spec'ed caps to save space.)
For the selector switch, will any two way switch work?
I also need a good source for a stereo pot/attenuator...
http://search.digikey.com/scripts/Dk...ame=CKN1032-ND I suspect that the internal contacts will be superior.
As for attenuator one of the stepped variety would be ideal,I have seen some decent looking ones on Ebay(Asian sourced) for $30ish.If you want dual 25K's as in NP's schem then the Bourns 91 series or Clarostat conductive plastics from Digi key would be good choices. http://search.digikey.com/scripts/Dk...V4NAYSD254C-ND
Partsconnexion sells the Blue Alps ganged pots but only in 10k and 100k.The 10k would likely work fine.
How far along in your build are you?
I got in on a group buy for a B1 board over the DIY forum. So I'll be building one of these at some point and time...:)
I am starting to collect the parts for the B1 and will probably start the build within the month. I will not be using a printed board as I thought this would be good P2P practice, and the boards themselves costs as much as the collective parts.
I just saw on the DIYaudio site, a builder who installed the B1 circuit into his Goldpoint. If I had a choice, that would be my new build direction, but one of those units is anything but cheap.
I have one of those and thought about doing the same thing, but I thought space would have been too tight. He must have installed the filter caps externally...and he used Solen caps(yuk).
How much power supply filtering capacitance do I need on this preamp? Is 15000uF required for the pair of caps? (It's just that they are pricey and a little hard to find)
Last edited by GV#27; 03-12-2009 at 06:10 PM.
Would a value like around 10000uf work okay, or should I stick with 15000uf?
It's an alps unit. I have a spare goldpoint there will eventually be swapped in there.
Same brand, older model though: http://www.cleanandquiet.com/upload/...nuator%202.jpg
It's a step above the DACT I have installed in the B1.
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