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a general layout for 'blend' ?

PostPosted: 29 Jan 2009, 09:47
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

Re: a general layout for 'blend' ?

PostPosted: 29 Jan 2009, 13:45
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

Re: a general layout for 'blend' ?

PostPosted: 29 Jan 2009, 18:33
by nezek
wow cool :)
thanks

Re: a general layout for 'blend' ?

PostPosted: 01 Feb 2009, 03:28
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?

Re: a general layout for 'blend' ?

PostPosted: 01 Feb 2009, 04:14
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]

Re: a general layout for 'blend' ?

PostPosted: 01 Feb 2009, 13:12
by nezek
the original plan was for a bass wah so I won't need it :)
but pretty cool ideas & schems there

clean blend knob

PostPosted: 09 Feb 2009, 22:52
by ifeellikeatourist
So, how hard is it to put a clean blend knob into a pedal? How does one go about doing this?

Re: clean blend knob

PostPosted: 10 Feb 2009, 02:22
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.

Re: clean blend knob

PostPosted: 10 Feb 2009, 03:14
by moltenmetalburn
Also, read this thread.

viewtopic.php?f=28&t=4240

Re: a general layout for 'blend' ?

PostPosted: 19 Apr 2009, 18:39
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

Re: a general layout for 'blend' ?

PostPosted: 30 Apr 2009, 19:48
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

Re: a general layout for 'blend' ?

PostPosted: 30 Apr 2009, 21:15
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.

Re: a general layout for 'blend' ?

PostPosted: 01 May 2009, 13:49
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?

Re: a general layout for 'blend' ?

PostPosted: 01 May 2009, 13:57
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...

Re: a general layout for 'blend' ?

PostPosted: 01 May 2009, 22:37
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?

Image

Re: a general layout for 'blend' ?

PostPosted: 01 May 2009, 22:48
by lolbou
Sure, same pins, no change... Unless you need the dirtyness of the 741 in this circuit, like in the MXR Dist +... :)

Dry Blend control: Would this work properly?

PostPosted: 27 May 2009, 16:10
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.

Re: Dry Blend control: Would this work properly?

PostPosted: 27 May 2009, 16:13
by Gino
Ok, I just found this topic. Sorry. :oops:

Re: a general layout for 'blend' ?

PostPosted: 03 Jun 2009, 15:16
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.

Re: a general layout for 'blend' ?

PostPosted: 03 Jun 2009, 15:18
by lolbou
You mean adding a gain stage in it?