a general layout for 'blend' ?

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nezek
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Post by nezek »

Hi, tried to search but couldn't find something that helped me..
I want to add a blend control (dry/wet) to a wah..
Do I need an active mixer or just a pot..?
thanks

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moltenmetalburn
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Post by moltenmetalburn »

I have never used a passive blender that sounded any good.

you can try this one, Joel Purkiss' Buff n' Blend Ive had some success with it in the past.

http://www.geocities.com/jrtookmyfalset ... ffblnd.gif
http://www.geocities.com/jrtookmyfalseteeth/buffpcb.gif
http://www.geocities.com/jrtookmyfalset ... ffwire.gif

OR this if you favor op amps, if you tie Send 2 to Return 2 and omit the jacks youll have a blender that blends with the dry. The Runoffgroove Splitterblend.

http://www.runoffgroove.com/splitter-blend.html

OR the Mooseapotamus Paralooper, originally designed for bass. If you omit the low pass filter on the clean signal you'll have a full range blend.

http://www.moosapotamus.net/THINGS/para ... perSCH.gif
http://www.moosapotamus.net/THINGS/para ... operTT.gif
http://www.moosapotamus.net/THINGS/para ... perLYT.gif

Good luck blending! :ROFL
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nezek
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Post by nezek »

wow cool :)
thanks

kurtlives
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Post by kurtlives »

moltenmetalburn wrote:I have never used a passive blender that sounded any good.

you can try this one, Joel Purkiss' Buff n' Blend Ive had some success with it in the past.

http://www.geocities.com/jrtookmyfalset ... ffblnd.gif
http://www.geocities.com/jrtookmyfalseteeth/buffpcb.gif
http://www.geocities.com/jrtookmyfalset ... ffwire.gif

OR this if you favor op amps, if you tie Send 2 to Return 2 and omit the jacks youll have a blender that blends with the dry. The Runoffgroove Splitterblend.

http://www.runoffgroove.com/splitter-blend.html

OR the Mooseapotamus Paralooper, originally designed for bass. If you omit the low pass filter on the clean signal you'll have a full range blend.

http://www.moosapotamus.net/THINGS/para ... perSCH.gif
http://www.moosapotamus.net/THINGS/para ... operTT.gif
http://www.moosapotamus.net/THINGS/para ... perLYT.gif

Good luck blending! :ROFL
How would you alter the Paralooper to be used with guitar?

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moltenmetalburn
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Post by moltenmetalburn »

OR the Mooseapotamus Paralooper, originally designed for bass. If you omit the low pass filter on the clean signal you'll have a full range blend.
full range= guitar.

if you needed more specific information replace R6 with a jumper and remove C5, and it's now a regular blend pedal. [smilie=a_bigteeth.gif]
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nezek
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Post by nezek »

the original plan was for a bass wah so I won't need it :)
but pretty cool ideas & schems there

ifeellikeatourist
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Post by ifeellikeatourist »

So, how hard is it to put a clean blend knob into a pedal? How does one go about doing this?

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Post by earthtonesaudio »

The answer to the first question depends upon which of the many ways you could answer the second question.

Easy and will work with any pedal:
Splitter at the input
Mixer at the output
-Dual-ganged pot turns effect output down while turning "clean" output up.
-Alternatively, separate volume controls for "effect" and "clean"

I'd use an op-amp for the mixer stage, for sure. This gives you the option of configuring it as a "summing amplifier" or a "difference amplifier" depending on whether the effect inverts the phase.

For the input, my first choice would be the other half of a dual op-amp, or a JFET if using a single op-amp.


...But there are many ways to do this, depending on your preferences.
rocklander wrote:hairsplitting and semantics aren't exactly the same thing though.. we may need two contests for that.

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Post by moltenmetalburn »

"The Humans Will Never Destroy Us"

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Post by moaner70 »

Hi

I'm looking to build the following "B Blender" as designed by Sean M for use on a Bass. Not yet verified but if someone wants to cast an eye over the layout i'd be grateful before I commit to building it. The ground is on strip K and I do plan to connect the ground of all the jack sockets and battery to ground also.

Image

This is from Sean's original schematic at his website

http://seanm.ca/stomp/bblender.html

Thanks
Mark

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Post by moaner70 »

I can now verify this works. I've amended the layout slightly and moved R5 to the other side of C8 as below.

Image

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Post by JiM »

Why don't you use some quad opamp, such as a TL074 ? It would be easier and take less space.
BTW, these 741 will be quite noisy ... and they may need some offset compensation.
I only give negative feedback.

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moaner70
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Post by moaner70 »

Thanks for the tip Jim, maybe next time. Would a TL074 be less noisy than a couple of 741? Or is there a better design I could use for blend?

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lolbou
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Post by lolbou »

moaner70 wrote:Would a TL074 be less noisy than a couple of 741?
Sure it will!! But you can improve your existing design with other single opamps (e.g. TL071..) with better noise characteristics...
- Are you a mod or a rocker?
- Uh, no, I'm a mocker.

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moaner70
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Post by moaner70 »

Lolbou, could I substitute the 741 for a TL071 in the design without any other changes? Just a case of slotting in the new IC's?

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lolbou
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Post by lolbou »

Sure, same pins, no change... Unless you need the dirtyness of the 741 in this circuit, like in the MXR Dist +... :)
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Gino
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Post by Gino »

Would this work for a Dry Blend control? Or would it overload the input, output or do something else strange? If so, how could this be fixed to allow for a dry blend on the output? Thanks in advance. :)

Image

Sorry for posting this on every DIY stompbox forum but I want to get as much input as possible.

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Gino
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Post by Gino »

Ok, I just found this topic. Sorry. :oops:

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Post by plexiplud »

If I wanted to drop this circuit into an existing overdrive pedal, such as my MXR Distortion III, where abouts in the circuit would i want to put it? I have a pretty basic understanding on circuitry at the moment but im hoping to try to learn alot more from here... cheers.

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Post by lolbou »

You mean adding a gain stage in it?
- Are you a mod or a rocker?
- Uh, no, I'm a mocker.

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