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Question about the "Colorsound Wah PCB layout"
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Foona



Joined: 11 Sep 2008
Posts: 14
Location: Sweden

PostPosted: Fri Sep 12, 2008 10:24 am    Post subject: Question about the "Colorsound Wah PCB layout" Reply with quote

I sat last night reading through this page.
Building a Wah Pedal From Scratch

I then grabbed the PDF file containing the PCB layout.
Iv'e been into DIY electronics for a year,
so sometimes i come accross stuff i do not reckognise.

The symbol marked in this picture, what kind of component is it?




Im also wondering..
Im trying to go for a pedal that sound like a simple CryBaby with Q control.
Is this curcuit the right one for me?
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Paul Marossy
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PostPosted: Fri Sep 12, 2008 11:55 am    Post subject: Reply with quote

That symbol is just a resistor standing up instead of laying down.

This circuit doesn't really sound that much like a CryBaby. Why not just build the CryBaby circuit and add a "Q" control to it? Inductors aren't that hard to get a hold of...
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Foona



Joined: 11 Sep 2008
Posts: 14
Location: Sweden

PostPosted: Sat Sep 13, 2008 10:20 am    Post subject: Reply with quote

Oh... Embarassed

I realize now, that symbol even have the same color as the other resistor symbols.
Thanxs for your help Mr.Marossy, however i have to ask you for your assitance yet once again.

Iv'e searched the web for cry-baby pedals schematics but,
i can't seem to find a schematic with the "Q".

Finding the original Dunlop Wah ain't to hard though.
Let's say i grab this schematic.
PDF: Cry for me

I can read schematics yes, but i cannot understand it fully.

Where do i put the pot for the "Q" control?
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Paul Marossy
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PostPosted: Sat Sep 13, 2008 2:36 pm    Post subject: Reply with quote

Quote:
Where do i put the pot for the "Q" control?


It would go where the 33K resistor is the to the right of the inductor. Place a 100K pot (wired as a variable resistor) between that 33K resistor and ground. That way, when the pot is at minimum, you always have at least 33K - or a maximum of 133K.

Does that make sense?
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Foona



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PostPosted: Sun Sep 14, 2008 10:32 am    Post subject: Reply with quote

It makes perfect sense, thank you.
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Paul Marossy
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PostPosted: Sun Sep 14, 2008 3:03 pm    Post subject: Reply with quote

No problem. Cool
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Foona



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PostPosted: Sun Sep 14, 2008 8:58 pm    Post subject: Reply with quote

I forgot to ask.

Am i supposed to use Logarithmic pots or linear pots?

<add>

looks like i have a few more questions than that.

Regarding the caps.

It looks like all of these caps are ceramic caps,
though the 4.7uF cap elude me.
Is this an electrolytic cap?

Regarding the 0,011uF cap, could i use a 0,01uF cap instead?

Also, im having some trouble with finding a 660mH inductor at my local electronics store. How much is 660mH in uH?

Eventhough iv'e built alot of "cool stuff", im still a n00b Smile
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Paul Marossy
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PostPosted: Sun Sep 14, 2008 10:52 pm    Post subject: Reply with quote

Quote:
Am i supposed to use Logarithmic pots or linear pots?


I don't think it matters much either way for the 100K frequency pot. I would use a linear pot for the Q control.

Quote:

It looks like all of these caps are ceramic caps,
though the 4.7uF cap elude me.
Is this an electrolytic cap?


You could use ceramic caps, but I used fim caps in my build. The 4.7uF is an electrolytic cap.

Quote:
Regarding the 0,011uF cap, could i use a 0,01uF cap instead?


Yeah, that should be fine.

Quote:
Also, im having some trouble with finding a 660mH inductor at my local electronics store. How much is 660mH in uH?


I get my inductors via ebay or mail order it from somewhere like www.tubesandmore.com or www.smallbearelec.com

Quote:
Eventhough iv'e built alot of "cool stuff", im still a n00b Smile


We all start there. Wink
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Foona



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PostPosted: Mon Sep 15, 2008 1:45 am    Post subject: Reply with quote

Thank you for all the answers.

I found some inductors at both "smallbear" and "tubes".
This one: P-ECB-156

I know the schematic call for an 660mH inductor, but this one should do the job right?

This is the only part missing to complete the PCB, looks like im going to have to wait for it though.
Usually takes about 2-3 weeks to get an order delieverd Sweden.
It will give me time to fiddle around with the case design....yes...
That is the real pain Very Happy
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Last edited by Foona on Mon Sep 15, 2008 1:49 am; edited 1 time in total
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Paul Marossy
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PostPosted: Mon Sep 15, 2008 1:49 am    Post subject: Reply with quote

The wah schematic (and patent docs) show a 500mH inductor. The current manufacture ones measure around 600-650mH. That should actually make it sound a tiny bit fatter.
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Foona



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PostPosted: Mon Sep 15, 2008 1:51 am    Post subject: Reply with quote

Ok, that settles it, i'll order right away.
You have been most helpfull, thank you.
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Paul Marossy
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PostPosted: Mon Sep 15, 2008 2:07 am    Post subject: Reply with quote

Glad to be of help. Cool
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Foona



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PostPosted: Mon Sep 15, 2008 12:37 pm    Post subject: Reply with quote

In this project: Building a Wah Pedal From Scratch

Is there any chance you could provide me with pitures of that project in higher resolution?
Im quite amazed by what you did there, I am not shure if I have the skills to do domething like that.

Im curious, have you ever built any other wah pedal after this one?
At the bottom of that page you say that you would probably do it differently the next time, so this is why im asking.
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Paul Marossy
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PostPosted: Mon Sep 15, 2008 1:58 pm    Post subject: Reply with quote

Foona wrote:
In this project: Building a Wah Pedal From Scratch

Is there any chance you could provide me with pitures of that project in higher resolution?
Im quite amazed by what you did there, I am not shure if I have the skills to do domething like that.

Im curious, have you ever built any other wah pedal after this one?
At the bottom of that page you say that you would probably do it differently the next time, so this is why im asking.


Sorry, no pictures with a higher resolution than what is on the site. That really was a lot more work than it needed to be.

My other, much simpler wah from scratch can be found here: http://www.diyguitarist.com/DIYStompboxes/DIY-Wah2.htm

It's easiest to just buy an empty wah shell from www.smallbearelec.com Wink
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Foona



Joined: 11 Sep 2008
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PostPosted: Tue Sep 16, 2008 11:59 am    Post subject: Reply with quote

Paul Marossy wrote:
It's easiest to just buy an empty wah shell from www.smallbearelec.com Wink


AHA!
You've saved my day...actually you've probably saved me weeks. Very Happy

Thank you mr Marossy.
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