Diezel VH4 Pedal  [schematic]

All about modern commercial stompbox circuits from Electro Harmonix over MXR, Boss and Ibanez into the nineties.

Re: Diezel VH4 Pedal

Postby SoftPalate » 07 Jun 2019, 15:41

Hey guys,

I'm new to all of this stuff and I recently picked up one of these boards and populated it and am ready to install it. I'm using a 1590BB (which is, I believe, what it was designed for) and after I got all the holes drilled I discovered that, while the pots all fit nicely, there isn't any room "beneath" them for the jacks to fit. All of your build pics look so nice and neat and I can't even find a way to squeeze those jacks in the enclosure. Am I doing something wrong?

Thanks for any help... :roll:
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Re: Diezel VH4 Pedal

Postby caspercody » 09 Jun 2019, 02:44


For this message the author caspercody has received thanks:
SoftPalate (17 Jun 2019, 15:50)
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Re: Diezel VH4 Pedal

Postby SoftPalate » 10 Jun 2019, 21:51

OK, thanks. This documentation is for a different board (Valhalla), which I realize is the same kind of clone, but I was referring to the drill template I found for the Wiezel, because that's the board I was building. That one has the pots so near the top, that the jacks won't fit without sticking out below the floor of the enclosure.

I'll make an adjustment and try to drill a new enclosure.
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Re: Diezel VH4 Pedal

Postby syamilaliff » 02 Aug 2019, 08:59

Putting it after a buffered did the trick. No more whistling noise.
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Re: Diezel VH4 Pedal

Postby Daverem » 10 Dec 2019, 16:53

I built one without the charge pump to test other voltages. Is it worth raising the voltage to + -15V?
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Re: Diezel VH4 Pedal

Postby lead2203 » 11 Dec 2019, 08:34

Optical wrote:Sorry for all the posts :o

I checked the photo and the tone stack does appear to be wired Fender style. So the schematic is correct.
I wonder why they went that way instead of like the real amp... I think i'll try the other configuration anyway to see how it sounds


I don't know if someone has pointed this out yet but the tone stack in the real VH4 IS wired Fender style. Peter does it this way in most of his amps and the mods I've seen.
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Re: Diezel VH4 Pedal

Postby befey » 02 Jan 2020, 20:20

I just finished building the pedal pcb Valhalla.

I used shielded wire on the input and output. Was getting some squealing on the highest gain settings before I put it in the enclosure.

Once it was boxed, it's super quiet even maxed.
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Re: Diezel VH4 Pedal

Postby Daverem » 15 Jan 2020, 06:26

some experiments.....i tried with 18+-, no oscillation with to much headroom and the tone feel was not like the original, 15+- feel good,but oscillation at 3 o clock, i came back to 12v be cause is a better tone for me.

I jump the buffer stage, take off 100k and it had 0 oscillation finally, the gain looked similar to the original but with a lilttle of lost of bite tones, not to much as put a clon buffer in front
(really bad sound), the buffer in the original give there some of personality and bite, but can jump it.

Im not and expert but my theory is: the buffer with the first high gain in the same op amp maybe create the oscillation in contact with 4th stage of tone control treble section....maybe some day i gonna build one with a insolated buffer and first stage, but without the buffer stage sound really good to me...
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Re: Diezel VH4 Pedal

Postby Daverem » 22 Jan 2020, 00:19

I finally build the same buffer in a insolated pcb and i canceled the original in the op amp... The oscillation is gone!!! And the tone is same as the original....maybe there was the problem, too much gain inside the same op amp... Now I gonna redesing the pcb, change all tl072 by opa2130 or jrc4580 for tube screamer flavor and return to the Icl7660 .... By the way, i took off the Insolated wires and still without oscillation, but with a little of ground noise, I gonna return at them for a better quiet tone...
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