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Messages - threefish

#1
I haven't really researched it, but I've got a few hints that converting a +v discrete circuit to +/- isn't really that straight forward as doing it with a chip circuit. I think I'll stick to my +22.5v.
Getting the parts for the circuit today. Hope to assemble next week or so. I'll post results.
#2
Thanks to you all for your input.
Yes Teemuk and Tom, good points about the tonestack. I'll be experimenting with thos options you've suggested. 
I'll be interested to hear the headroom offered by the 20v I have to work with - the power supply for my LM1875 poweramp is +/-20v, so I'll be running it off of the + supply rail. I know that running it off one supply rail may unbalance things a little, but I'm anticipating a really low current draw....which brings me to a +/- supply for this. My electronics knowledge doesn't extend as far as to design this conversion, but I know it would be fairly straight forward. If anyone wants to give me some clues how to do this I'd love to hear from you. I could then run it as +/- and not just +, and be able to use it all the way up to the 30v swing it appears to be capable of, not just 20v.
#3
Hi everyone,

I'm looking for a new preamp for my lm1875-powered guitar combo - I'm after a fairly clean sound that I can put my stompboxes in front of. I've considered the Thomas Vox preamp and limiter that has appeared in discussion on this forum here (and where I first saw it diystompboxes) , but stumbled across this preamp circuit today : http://www.redcircuits.com/Page120.htm.
Anyone done it? Know anything about it? Thoughts? Impressions?

Thanks