Can anyone advise on and make me a simple buffer preamp?

[lemmywinks]

I've finally got all the parts to overhaul my fretless, the final stage is swapping the pickups and fitting the piezo bridge. This is being done by my tech (really my old mate's dad but he's ace with stuff like that)

I need a buffer preamp making, something small and simple with a volume control and preferably a tone, to be powered off a single 9v battery as i'm changing the mag pickups back to passive

The ones i've been looking at are these:

[url="http://www.scotthelmke.com/Mint-box-buffer.html"]http://www.scotthelmke.com/Mint-box-buffer.html[/url]

[url="http://www.till.com/articles/GuitarPreamp/index.html"]http://www.till.com/articles/GuitarPreamp/index.html[/url]

[url="http://www.cafewalter.com/cafewalter/fetpre/index.htm"]http://www.cafewalter.com/cafewalter/fetpre/index.htm[/url]


Do these look alright? I'm leaning towards the last one


Also i'd like some advice on control layouts, i want a vol/vol/tone for the mag pickup and a vol/tone for the piezo, maybe with a series parallel switch on the mag pickups too

Can you get a stacked vol/tone pot so i can keep the piezo controls down to one pot?


Cheers folks!
Steve

[pete.young]

[quote name='lemmywinks' post='721462' date='Jan 22 2010, 06:01 PM']Can you get a stacked vol/tone pot so i can keep the piezo controls down to one pot?[/quote]

These are readily available. I've never seen a Piezo setup with a tone control though. Of course, that doesn't mean they don't exist!

[lemmywinks]

I only put that because on my acoustic bass there is a passive volume and tone control. To get any sort of decent bass sound out of it the tone has to be completely rolled back as the treble from the piezo is quite harsh. if it's not necessary then it can be omitted