stereo preamp from mp3 to roland micro cube.???

[deadastronaut]

yayyyyyy got it....that kicks ass, cheers ian!

my poor little roland ....those rabbits are gonna suffer now, you never know though they might like it..!!!!!...ha ha...

as luck would have it i have a 100k dual pot with knobs too..and the volume goes right off too now..brilliant.

i'll knock up a pcb for this...and post it up if anyone else wants it...cheers guys!!!!!...

i don't have to have my mp3 maxed out now,  as a comparison i tried my mp3 on its own, and with this circuit i only have to have the vol on 9oclock to get it the same,,so plenty there..excellent'e......


edit:

pdf layout files for anyone who wants/needs it...

https://dl.dropbox.com/u/7464107/STEREOPREAMP.pdf

https://dl.dropbox.com/u/7464107/STEREOPREAMPPCB.pdf

and a vero in case your lazy...

[Ronan]

Rob, nice job...  For some silly reason I put 2 x resistors in there that aren't required.
However, they won't affect the circuit at all, so probably easiest to leave them in, in your build. I updated the schem. Sorry 'bout that.

By convention, there should be a 47uF or 100uF from 9V to ground as well, but if the circuit is battery-powered, I'm not sure if you'll hear any difference. If you are going to revise your vero layout, one of the caps needs to 10uF 

[chi_boy]

I have that amp too and it now has a new life in the garage and by the pool as a semi-permanent mp3/Pandora player.  We run multiple devices through it and never had a problem with volume from the amp.  Have you tried different cables?  and is the mp3 player loud with headphones, or quite with those too? 

[deadastronaut]

@ian, oops yes 10uf on the vero...i'll sort it ok...thanks for the heads up....i'll run it on batteries, but yeah i may add that 100uf in case i feel the urge to add a dc socket and use it indoors too...good idea!.

you mean  the 47k's?..


@george, cool,  i'll have to try that later my missus has it at the mo... i was going to have just an mp3 (3.65mm) stereo in and out,  but i may add left/right jacks too...see how it goes, i have a small
plastic project box it'll go into nicely...

[Ronan]

Yep, the 2 x 47k's, not needed, but won't hurt either, if you've already built it that is...

[deadastronaut]

nope not built yet...waiting on stereo jacks......i'll update the pdf's and vero once i get my bloody chorus going.. ..cheers man..

edit: pdf's above updated:

and new vero...