DIEFET: Jfet simulation of the Diezel VH4
Created on the French DIY community http://www.techniguitare.com
http://www.techniguitare.com/projets/Di ... -V1-11.pdf
Sample 1
Sample 2
Sample 3
Schematic with components
PCB
BOM
It was not created with the ROG techniques because the schematic of the VH4 is not known, so we created a preamp with a spectral analysis of an original VH4 to see which frequencies are typical of the VH4 sound (channel 3 & 4 ).
We worked 6 months on it to do the last schematic.
- analogguru
- Old Solderhand
Information
I don´t know what is a Diezel VH4 - does it sound like a V8-Diesel-motor ?
.... and the design still uses drain-trimmers - even at the source bypassed stages - which will cause every unit to sound different due to the different drain-currents....
If only the frequency response would be important, someone could use op-amps instead of the FET´s too...
analogguru
.... and the design still uses drain-trimmers - even at the source bypassed stages - which will cause every unit to sound different due to the different drain-currents....
If only the frequency response would be important, someone could use op-amps instead of the FET´s too...
analogguru
There´s a sucker born every minute - and too many of them end up in the bootweak pedal biz.
Used by metallica, tool, smashing pumpkins, muse etc...I don´t know what is a Diezel VH4 - does it sound like a V8-Diesel-motor ?
Matthew Bellamy / Muse
Adam Jones / Tool
Billy Corgan / Smashing Pumpkins
James Hetfiled / Metallica
Kirk Hammeth / Metallica
Mark Tremonti / Creed / Alter Bridge
Wes Borland / Limp Bizikit / Black Light Burns / Marilyn Manson
Mike Mushock/ Staind
It's the conception of the Jfet simulation: use drain trimmers and adapt them to 6v. (4.5v for 9v sim)..... and the design still uses drain-trimmers - even at the source bypassed stages - which will cause every unit to sound different due to the different drain-currents....
If only the frequency response would be important, someone could use op-amps instead of the FET´s too...
- analogguru
- Old Solderhand
Information
It is simply a junk-conception, even "stm" from ROG found this out in the meantime:It's the conception of the Jfet simulation: use drain trimmers and adapt them to 6v. (4.5v for 9v sim).
https://www.diystompboxes.com/smfforum/ ... c=70065.80
analogguru
There´s a sucker born every minute - and too many of them end up in the bootweak pedal biz.
Feel free to upgrade but your method is to respect the frequencies of simulated stages BUT , we did'nt start from the schematic of the Diezel. (post 1 of this topic).
You can read the conception here:
http://www.techniguitare.com/forum/viewtopic.php?t=6606
You can read the conception here:
http://www.techniguitare.com/forum/viewtopic.php?t=6606
I followed the project on techniguitare. It is not a traditional simulation with the ROG method. In fact it does not stem from the schematic of the Diezel, but from the Dual Rectifier. Then a frequency analysis of a VH4 has been performed, in order to design a post-equalizer capable of mimicking the frequency response of this amp, and has been added to the Rectifet (the techniguitare version of the Dual Recto simulation).
Of course, it could be done with other devices, but that's how the project originated. Maybe in a future version ...
EDIT: echOes, you beat me to it ...
Of course, it could be done with other devices, but that's how the project originated. Maybe in a future version ...
EDIT: echOes, you beat me to it ...
It was at the beginning, now it's a totally new preamp ! the post eq idea was abandonned for exampleDSV wrote:I followed the project on techniguitare. It is not a traditional simulation with the ROG method. In fact it does not stem from the schematic of the Diezel, but from the Dual Rectifier. Then a frequency analysis of a VH4 has been performed, in order to design a post-equalizer capable of mimicking the frequency response of this amp, and has been added to the Rectifet (the techniguitare version of the Dual Recto simulation).
- John Lyons
- Solder Soldier
Just use the PCB and "Schematic" (which is actually the Layout map).
The PDF is pretty bad! Hard to read and fuzzy.
You could probably just print the schematic and compare it to the BOM and layout.
But why not just make a decent PDF huh?
Sounds ok but the sound clips are overly bassy...
john
The PDF is pretty bad! Hard to read and fuzzy.
You could probably just print the schematic and compare it to the BOM and layout.
But why not just make a decent PDF huh?
Sounds ok but the sound clips are overly bassy...
john
The bass control is the same as the original on the VH4 (as the teble and middle)because we found the schematic of the tonestack, the deep control is also on the vh4 (see the user manual) it boost around 100Hz, and the extra control will decrease the bass level before the tonestack and the deep control.
we work on a 1.2 version to add a "dynamic" control
So if you make the extra control as an outside control, it could be a 9-knobs distortion (on test!)
Vol
Gain
Bass
Mid
Treb
Deep
Presence
Dynamic
Cut (the extra control to cut the bass before the tonestack)
So if you make the extra control as an outside control, it could be a 9-knobs distortion (on test!)
Vol
Gain
Bass
Mid
Treb
Deep
Presence
Dynamic
Cut (the extra control to cut the bass before the tonestack)