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a general layout for 'blend' ?
Posted: 29 Jan 2009, 08:47
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' ?
Posted: 29 Jan 2009, 12:45
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!
Re: a general layout for 'blend' ?
Posted: 29 Jan 2009, 17:33
by nezek
wow cool
thanks
Re: a general layout for 'blend' ?
Posted: 01 Feb 2009, 02:28
by kurtlives
How would you alter the Paralooper to be used with guitar?
Re: a general layout for 'blend' ?
Posted: 01 Feb 2009, 03:14
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.
Re: a general layout for 'blend' ?
Posted: 01 Feb 2009, 12:12
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
Posted: 09 Feb 2009, 21:52
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
Posted: 10 Feb 2009, 01:22
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
Posted: 10 Feb 2009, 02:14
by moltenmetalburn
Re: a general layout for 'blend' ?
Posted: 19 Apr 2009, 17:39
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.
This is from Sean's original schematic at his website
http://seanm.ca/stomp/bblender.html
Thanks
Mark
Re: a general layout for 'blend' ?
Posted: 30 Apr 2009, 18:48
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.
Re: a general layout for 'blend' ?
Posted: 30 Apr 2009, 20:15
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' ?
Posted: 01 May 2009, 12:49
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' ?
Posted: 01 May 2009, 12:57
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' ?
Posted: 01 May 2009, 21:37
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?
Re: a general layout for 'blend' ?
Posted: 01 May 2009, 21:48
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?
Posted: 27 May 2009, 15:10
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.
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?
Posted: 27 May 2009, 15:13
by Gino
Ok, I just found
this topic. Sorry.
Re: a general layout for 'blend' ?
Posted: 03 Jun 2009, 14:16
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' ?
Posted: 03 Jun 2009, 14:18
by lolbou
You mean adding a gain stage in it?