Mellowtone - Wolf Computer  [traced]

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Re: Mellowtone - Wolf Computer

Postby earthtonesaudio » 01 Dec 2010, 19:00

I would suggest adding a limiting resistor (~1000 ohms) in series with the Bias pot; currently if both the Bias and the Sag controls are set to minimum resistance, then Q2 is in danger.
rocklander wrote:hairsplitting and semantics aren't exactly the same thing though.. we may need two contests for that.
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Re: Mellowtone - Wolf Computer

Postby IvIark » 01 Dec 2010, 19:33

I've updated the vero so the Sag and Fuzz controls are reversed, and I also reversed the bias pot which must also be backwards if the Sag pot was.
If you CTRL + F5 to refresh and update your cache the new one should be there.
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Re: Mellowtone - Wolf Computer

Postby mustang » 02 Dec 2010, 22:28

I've just started building one of these on my blog..

http://melxfx.blogspot.com/2010/12/diy- ... t-one.html

Thanks to IvIark, CJ and everyone else who helped with the layout/figuring out stuff. :hug:
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Re: Mellowtone - Wolf Computer

Postby IvIark » 02 Dec 2010, 22:37

Nice one Si. God I hope it works now you've done a new thread for it! :shock: :mrgreen:
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Re: Mellowtone - Wolf Computer

Postby mustang » 02 Dec 2010, 23:06

IvIark wrote:Nice one Si. God I hope it works now you've done a new thread for it! :shock: :mrgreen:


It will work, I have faith!! [smilie=pope.gif]
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Re: Mellowtone - Wolf Computer

Postby roseblood11 » 03 Dec 2010, 01:01

earthtonesaudio wrote:I would suggest adding a limiting resistor (~1000 ohms) in series with the Bias pot; currently if both the Bias and the Sag controls are set to minimum resistance, then Q2 is in danger.



+1 !!!
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Re: Mellowtone - Wolf Computer

Postby dkirby1 » 04 Dec 2010, 23:43

Hello, I'm new to the forum and pedal building, and I have a newb question about earthtonesaudio's post. When he suggested adding a limiting resister in series with the bias pot, and as IvIark's layout as reference, does this mean putting a resistor between the yellow wire and the third lug of the bias pot?
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Re: Mellowtone - Wolf Computer

Postby IvIark » 05 Dec 2010, 00:10

Just take the yellow wire to the top row, move the right hand link one space to the right to the very edge, and put a 1K resistor from the hole to the right hand side of the top row track cut, to the third row from the bottom where the yellow wire currently goes.
"If anyone is a 'genius' for putting jacks in such a pedal in the only spot where they could physically fit, then I assume I too am a genius for correctly inserting my legs into my pants this morning." - candletears7 - TGP
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Re: Mellowtone - Wolf Computer

Postby dbeeson » 27 Feb 2011, 16:32

I've made a PCB layout for this circuit but I can't seem to get it working. I've tried twice. Could someone have a look and see if I messed up somewhere? As far as I can see, everything is where it should be. The pot layout is the same as IvIark. There is no 1k limiting resistor on this one.
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Re: Mellowtone - Wolf Computer

Postby dbeeson » 27 Feb 2011, 16:42

the layout without the values.
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Re: Mellowtone - Wolf Computer

Postby LaceSensor » 28 Feb 2011, 02:32

HI

I would not bother to make this as the layout proposed in the thread doesnt make the Wolf Computer sounds.
Until someone posts gut shot with traces we cant make this properly.
The proposed schematic, when made, produces and overdrive pedal pretty much.

No negative intended I appreciate the efforts, but its not the same as a WC in sounds, so best to wait til a better version is drafted.
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Re: Mellowtone - Wolf Computer

Postby dbeeson » 28 Feb 2011, 06:49

Thanks for the reply.

I have built circuit already with IvIark's layout and it does sound very similar to the WC. I would not say the result is an overdrive, but I certainly agree that it is not the same as a WC, from what I've seen on the youtube videos. It is still a great effect with the starve and bias functions. I thought it would be nice to mount the switch onto the PCB, but it doesn't seem to work properly. I get a low volume when I crank the output knob, and the other knobs either seem to boost or cut the volume a bit. The overall tone is muddy as well.
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Re: Mellowtone - Wolf Computer

Postby NetStar » 01 Mar 2011, 04:21

I've spoken to Melx and will see if I can borrow my friend's Wolf Computer to be sent to him/IVIark for investigation.
In the meantime, please don't waste you time with previous layouts.

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Re: Mellowtone - Wolf Computer

Postby LaceSensor » 01 Mar 2011, 06:34

@Netstar, that would be awesome, thanks for your efforts.

The layout listed, while cool in its own right, isnt a WC sadly.
IF someone can do trace shots in detail perhaps we can figure this one out.

Cheers all
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Re: Mellowtone - Wolf Computer

Postby IvIark » 01 Mar 2011, 09:03

Thanks NetStar, you're an ... erm star! :mrgreen:
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Re: Mellowtone - Wolf Computer

Postby NetStar » 01 Mar 2011, 11:07

I might be able to take pictures when I get it. I'll borrow my flatmate's camera.
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Re: Mellowtone - Wolf Computer

Postby IvIark » 01 Mar 2011, 11:47

That would be great, if you could get a decent front and back board pic then you won't need to send it out. :thumbsup
"If anyone is a 'genius' for putting jacks in such a pedal in the only spot where they could physically fit, then I assume I too am a genius for correctly inserting my legs into my pants this morning." - candletears7 - TGP
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Re: Mellowtone - Wolf Computer

Postby jchot » 27 Aug 2013, 20:08

uh... guys?

I know I'm a little late to the party, but i just bread-boarded this and it sounds just like a wolf computer:
http://forum.gtlab.net/cgi-bin/yabb2/Ya ... 7545538/20
Image

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Re: Mellowtone - Wolf Computer  [traced]

Postby Beedoola » 28 Aug 2013, 02:36

Hi there. I borrowed a friend's original a made a clone for myself years ago and then sold the clone to my roommate - not knowing there was issues with the schematics out there. I had just popped open the original and eyeballed the layout and made one matching it.

My old roommate let me borrow the clone so I could check it out. Here is the schem as matching the clone I made.

The parts used were taken from when Mellowtone shared the parts info in the previous pages. I can't be for sure if I matched those values with what was in the actual WCPU I borrowed, but I think it sounds the same...
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Re: Mellowtone - Wolf Computer

Postby Beedoola » 31 Aug 2013, 05:26

IvIark wrote:Thanks cj, here's a quick layout if anyone wants to try it:

[ Image ]


For those that are interested. I built a WCPU using IvIarks layout but changed a few things, which are listed below and correspond to the schematic I attached in my last post:

The 1k resistor goes from the Emitter of Q3 to ground.

I tried the 10k for the Sag (I used 5k on the clone I built) and reverted back to the 5k - Has more useful oscillation and range.

For the Sag control - Lug 3 goes to 9v, Lugs 1 and 2 go to lugs 1 and 2 for the Bias control, and both go to the location in Ivlark's layout - top left/ 4.7k resistor.
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