Blender pedal - Wet N Dry

rps-10 · Post by **rps-10** » Fri Sep 28, 2012 11:20 pm

Has anyone here built a simple wet & Dry blend pedal for themselves? After 20 odd years of avoiding them I went and got myself a Whammy pedal (thanks to Thomas) and I think one of these blend pedals would make it 100 times better. So I'm looking for some pointers on how to build one myself.

I kind of resent paying the chap at Napalm Pedals 60 odd quid for such a thing when I'm sure its only a variation on a true bypass/feedback loop type pedal.
Ok that's an over simplification as I don't think I can get away with just wiring up the dry & wet inputs to a single pot due to it grounding out at the extremes of either end. So from what I've found so far it's some type of Op Amp affair to make this work with a single knob?
Although I could do it passive by using 2 pots (see: http://www.beavisaudio.com/techpages/Po ... eMixer.gif ), but that's not as aesthetically pleasing.

Finding an actual confirmed working circuit of one of these things seems to be a hidden black art, plenty of pointers in various threads I've seen but all do this and leave off that or add this to this

Plus it's a handy thing to have as it would also work well with other Wet n Dry out pedals I have.

h8mtv · Post by **h8mtv** » Sat Sep 29, 2012 12:54 pm

Sure thing! Bender Blender.

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This is a good, verified layout.

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johnnyseven · Post by **johnnyseven** » Sat Sep 29, 2012 1:12 pm

I had one of these back when I had a whammy and it did make it a whole lot more useful. I'd avoid buying the Naplam Pedals version though as, from experience, the guy is a bit of a knob. I bought a feedback loop pedal from him a number of years ago and the pot in it was rubbish and it went from 0 to 10 within about a millimetre, meaning there was either no feedback or tons of it. He said that was how it worked and didn't offer a refund.

NickS · Post by **NickS** » Sat Sep 29, 2012 9:02 pm

h8mtv wrote:Sure thing! Bender Blender.
This is a good, verified layout.
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I don't like the layout as shown since it puts around +4 volts on the send output. I would take the send output from the tag that the blue wire is connected to, i.e. after the blocking cap C2.

rps-10 · Post by **rps-10** » Mon Oct 01, 2012 4:53 pm

johnnyseven wrote:I had one of these back when I had a whammy and it did make it a whole lot more useful. I'd avoid buying the Naplam Pedals version though as, from experience, the guy is a bit of a knob. I bought a feedback loop pedal from him a number of years ago and the pot in it was rubbish and it went from 0 to 10 within about a millimetre, meaning there was either no feedback or tons of it. He said that was how it worked and didn't offer a refund.

Wouldn't happen to remember what one you had and where you got it from would you?

johnnyseven · Post by **johnnyseven** » Mon Oct 01, 2012 5:35 pm

I don't i'm afraid.