Diezel VH4 Pedal  [schematic]

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Re: Diezel VH4 Pedal [Gut shots]

Postby 440hz » 20 Jun 2017, 03:11

kh602 wrote:
J0K3RX wrote:kh602, excelent pics! Hate to bother you further but, do those pots have any values on them that you can see without lifting them? I have a few pots like that so I am fairly sure the values are on the bottom facing the board.. We can probably guestimate what they should be in the tonestack since it looks like your average marshall type stack with standard values judging from the cap and resistor values.


Measured values of the pots (most are in rheostat config, i assume master and treb are potential dividers at a glance).

Gain pot = 159.7k
Bass pot = 566k
Mid pot = 24.82k
Treb Pot = 262.3k
Master Pot = 10.93k
Pres Pot = 21.07k
Deep pot = 25.35k

Hope this helps


Did you measure those with a multimeter while they were still wired into the circuit?

I've always heard that you can't measure resistance when the resistor in question is still hooked up to the rest of a circuit. Is there any reason that it would work in this case?
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Re: Diezel VH4 Pedal [Gut shots]

Postby bajaman » 20 Jun 2017, 08:52

R26 and R34 are 1k not 110R :wink:

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Re: Diezel VH4 Pedal

Postby bajaman » 21 Jun 2017, 02:07

guess what I am doing with all the nice gut shot pictures :hmmm: :wink:

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Re: Diezel VH4 Pedal

Postby bmxguitarsbmx » 21 Jun 2017, 04:35

bajaman wrote:guess what I am doing with all the nice gut shot pictures :hmmm: :wink:


Making magic happen? :D

I'd like to breadboard this. I realize these are 400V caps, but could C11 really be only 4n7? Seems a bit small for that late in the gain stages...
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Re: Diezel VH4 Pedal

Postby bajaman » 21 Jun 2017, 06:53

from the photos C8 is 2200p 630v and C11 is 4700p 630v :wink:

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Re: Diezel VH4 Pedal

Postby bajaman » 21 Jun 2017, 06:56

I am pretty certain it would sound the same with less expensive 100v capacitors though perhaps they used 630v types to justify the high price of the pedal or maybe , being a tube amplifier manufacturer, they simply had lots of these high voltage capacitors in stock already :hmmm:
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Re: Diezel VH4 Pedal

Postby bmxguitarsbmx » 22 Jun 2017, 00:03

bajaman wrote:I am pretty certain it would sound the same with less expensive 100v capacitors though perhaps they used 630v types to justify the high price of the pedal or maybe , being a tube amplifier manufacturer, they simply had lots of these high voltage capacitors in stock already :hmmm:


I agree you are probably right. The wima website is a very interesting read on capacitors: http://www.wima.de/EN/article.htm

The Wima FKP 4 series is an interesting one. Internally it is a series connection of two capacitors essentially.


Not to encourage cork sniffing, but I replaced every ceramic cap in my jcm800 with silver mica only to put it back to stock the very same day. Other amps sound top notch with silver mica, however.

Thanks for the verification Bajaman! :)
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Re: Diezel VH4 Pedal

Postby marcao_cfh » 22 Jun 2017, 01:27

bmxguitarsbmx wrote:
bajaman wrote:guess what I am doing with all the nice gut shot pictures :hmmm: :wink:


Making magic happen? :D


I too am sure there's some magic coming!

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Re: Diezel VH4 Pedal

Postby bajaman » 22 Jun 2017, 10:34

I finished the board layout and have uploaded it to OSH PARK as a shared project - file is: Weasel V84 pedal :secret:
Here are some pictures etc.
6e551f305b6bcbbde58e4760afc4ced0.png

6f4b8ed2861cd62824657eb2a0aca1a2.png
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Re: Diezel VH4 Pedal

Postby bajaman » 22 Jun 2017, 10:36

Weasel V84 bottom layer.JPG

Weasel V84 pedal.zip

The last file is the gerbers and drill files :wink:
Have fun
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Re: Diezel VH4 Pedal

Postby rcustoms » 22 Jun 2017, 15:08

bajaman wrote:I finished the board layout and have uploaded it to OSH PARK as a shared project - file is: Weasel V84 pedal :secret:
Here are some pictures etc.
6e551f305b6bcbbde58e4760afc4ced0.png

6f4b8ed2861cd62824657eb2a0aca1a2.png

great work bajaman,please post the final schematics ,i would like to do a single side pcb to share
thanks
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Re: Diezel VH4 Pedal

Postby bajaman » 22 Jun 2017, 22:18

Hello Rcustoms :D
great work bajaman,please post the final schematics ,i would like to do a single side pcb to share
thanks

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.
cheers
bajaman

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Re: Diezel VH4 Pedal

Postby bajaman » 22 Jun 2017, 22:25

the previous pictures of the top and bottom layers are 300 dpi.
these further two pictures are half sized due to the forum restriction of 1M byte files :wink:
Weasel V84 pedal top photoview half size.JPG

Weasel V84 pedal composite half size.JPG

cheers
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Re: Diezel VH4 Pedal

Postby bajaman » 22 Jun 2017, 22:28

Does anyone know where to purchase these horizontal mounting potentiometers ?
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Re: Diezel VH4 Pedal

Postby 440hz » 23 Jun 2017, 07:10

Nice layout! Thanks for sharing.

OSHPark's pricing is $5 per square inch for 3 boards. Since your board measures 4.38x4.88 inches, that's 21.4 square inches, or about $107 for three boards.

That's just over $35 per board. Seems pricey. Are there any other PCB manufacturers that offer better pricing? Or is this really what you guys pay for boards?
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Re: Diezel VH4 Pedal

Postby 440hz » 23 Jun 2017, 07:18

Also, what size enclosure would this require? The 1590BB is the biggest I've used, and those measure 3.7x4.7 inches -- almost long enough in the longer dimension, but a half inch too short in the shorter dimension.
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Re: Diezel VH4 Pedal

Postby bajaman » 23 Jun 2017, 09:05

Nice layout! Thanks for sharing.

OSHPark's pricing is $5 per square inch for 3 boards. Since your board measures 4.38x4.88 inches, that's 21.4 square inches, or about $107 for three boards.

That's just over $35 per board. Seems pricey. Are there any other PCB manufacturers that offer better pricing? Or is this really what you guys pay for boards?


OSH PARK also offer a medium run double layer service at $1 per square inch for a minimum 10 board order, ($214.00 for 10) which makes the single board price $21.40 :wink:
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Re: Diezel VH4 Pedal

Postby bajaman » 23 Jun 2017, 09:08

Also, what size enclosure would this require? The 1590BB is the biggest I've used, and those measure 3.7x4.7 inches -- almost long enough in the longer dimension, but a half inch too short in the shorter dimension.


The layout was traced directly from the Diesel pictures - so that is the size of the Diezel enclosure. Now where can one get those potentiometers :wink:
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Re: Diezel VH4 Pedal

Postby bajaman » 23 Jun 2017, 10:13

update - found two small errors around C3 and C4 on my board layout - now corrected (Rev 1) file shared at OSH PARK :oops:
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Re: Diezel VH4 Pedal

Postby 440hz » 23 Jun 2017, 16:03

bajaman wrote:Now where can one get those potentiometers :wink:


Are those not just your average right-angle PCB mount pots like these? http://www.taydaelectronics.com/potenti ... mount.html
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