Diezel VH4 Pedal  [schematic]

All about modern commercial stompbox circuits from Electro Harmonix over MXR, Boss and Ibanez into the nineties.
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440hz
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Post by 440hz »

Aha; I knew someone posted a correction a couple pages back:
bajaman wrote:The schematic posted previously in this thread by another member is correct - but as i mentioned R26 and R34 are 1k not 110R.
The back to back diodes are 5v6 zeners.
It might be a couple days til I have the time, but I'll try to upload a modified schematic reflecting these corrections.

edy_wheazel
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Post by edy_wheazel »

I also build mine a while ago with the PCB I posted.
Depending on the tone settings I also have a whistle when I turn the Gain up, but I don't use it at the max anyway.
Overall it's a kick-ass pedal! Try to use "C" pot's for "Presence" and "Deep", I used liniar ones and, as Bajaman said, the entire spectrum is available on around 15% of the pot's range. Also, I have the impression that the "Gain" and "Vol" pot's range is not liniar, but maybe it's just my impression and it' not a problem anyway.

Thanks for the schematic, it's a fun build!
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alltrax
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Post by alltrax »

And here is mine. I know it's not very smart to label the pedal with the brand of the original but this one is for me I don't intend to sell it

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It sounds great, all posts are very effective and I have absolutely no background sound even with gain pot maxed so that's great.
But I have no sound in bypass and the indicator led does not light.
I checked with my DMM and there is nowhere on the 3pdt where I have continuity with the output (front amp output)
It should be something stupid I guess...

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sledgehammer
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Post by sledgehammer »

alltrax wrote:But I have no sound in bypass and the indicator led does not light.
I checked with my DMM and there is nowhere on the 3pdt where I have continuity with the output (front amp output)
It should be something stupid I guess...
...actually there is no sound on purpose - if you use the output which is meant to be used with poweramps.

andlord
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Post by andlord »

Has anybody tried to replace the OPA2134 with another opamp? Any comments on sound?

Jan1966
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Post by Jan1966 »

OP2A2604

Must use. Sounds amazing.

andlord
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Post by andlord »

I was thinking about something more common like tl072 or ne5532 (i might have to compare the datasheets if they have at least the same pinout)

alltrax
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Post by alltrax »

sledgehammer wrote:
alltrax wrote:But I have no sound in bypass and the indicator led does not light.
I checked with my DMM and there is nowhere on the 3pdt where I have continuity with the output (front amp output)
It should be something stupid I guess...
...actually there is no sound on purpose - if you use the output which is meant to be used with poweramps.
Well, that's right, I used the PA output in front of the amp and it sounds great like that
I switched to the other output, output volume is very low and the sound is very dark, plus I have so bzzzz when bypassed...

andlord
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Post by andlord »

Finished my build a few days ago. Such a great Pedal. Big Thank you goes to Bajaman for this superb PCB design.

Image

Image

Time to buy a proper enclosure

andlord
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Post by andlord »

Sorry for those huge pics (and the doublepost), i swear the preview was ok.

Here is the link to the gallary:
https://imgur.com/gallery/5PL7S

orcl2
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Post by orcl2 »

Andlord,did you use the C type o potentiometers on the Pres and Deep controls? How are the response of this controls?

andlord
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Post by andlord »

orcl2 wrote:Andlord,did you use the C type o potentiometers on the Pres and Deep controls? How are the response of this controls?
No I used B type. C type was not available :(
I tend to set those kind of controlls to match my amp and don't play around with those. I'm not at home for a few days so I can't test it, sorry. I'll sweep through different positions when I'm back and give you a proper response.

orcl2
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Post by orcl2 »

Thx Andlord. :)

efe
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Post by efe »

Is there anyone with a spare board and want to sell ? I am ready to buy 1 :)

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bajaman
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Post by bajaman »

:D I have boards available for this :wink:
PM me for details please.
cheers
bajaman
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cbriere
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Post by cbriere »

where can i order a couple of PCB?

Moerbius
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Post by Moerbius »

Hello and congrats for "cloning" this pedal "just" by looking at his pictures :applause:

I would like to order some PCB from itead studio. Where can i download the gerber files of the latest version? i found only the files for the big PCB...

Thanks in advance

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Ichabod_Crane
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Post by Ichabod_Crane »

Veroboard version is here: http://tagboardeffects.blogspot.it/2017 ... l-vh4.html :)
But still NOT verified.

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Cub
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Post by Cub »

While this topic is active again, does anybody recognise the "Rectifier Pre-amp" that's in the rack on the photograph in the first message?
It's definitely not made by Mesa/Boogie and the knobs are often used by DIY-ers and commercial clone-ers from Russia.
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With twigs and leaves and branches and conkers by the ton.

andlord
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Post by andlord »

orcl2 wrote:Andlord,did you use the C type o potentiometers on the Pres and Deep controls? How are the response of this controls?
So, now I had the time to fire this bad boy up again.
Like I said I used B type pots and it is not a good type for this controll. Apparently I was lucky to dial in my prefered sound at the first try. it has a lot of range that does not change much and on the last 10% is a rapid encrease to the bottom end. The Pres is ok-ish but the Deep should defenetly be something else, not B.
Like I said I can dial in my tone quite fast so I don't really care and won't change my pots :D

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