Fet version of ENGL530 MOD2

Original effects with schematics, layouts and instructions, freely contributed by members or found in publications. Cannot be used for commercial purposes without the consent of the owners of the copyright.
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KMG
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Post by KMG »

Original tube schematics by Aznaur Gishian (for reference)
http://milas.spb.ru/~kmg/files/schemati ... l-mod2.gif
Project files
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Controls
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Two sound tests (real samples will be later when device will be put in box)
Lead channel->V30 SpeakerSim->Reverb->Sound Card, Gain=2, Tone controls=middle
http://milas.spb.ru/~kmg/files/projects ... et/2/2.mp3
Lead channel->V30 SpeakerSim->Sound Card, Gain=5, Tone controls=middle
http://milas.spb.ru/~kmg/files/projects ... et/2/3.mp3
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mictester
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Post by mictester »

WOW! Great job! :thumbsup :thumbsup
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Post by IvIark »

Absolutely love your work, well done. You need to start selling the PCBs though! :D
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Post by KMG »

Added gerber and drill files
http://milas.spb.ru/~kmg/files/projects ... et/gerber/
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audioguy
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Post by audioguy »

This would be awesome as a single sided project!
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coldcraft
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Post by coldcraft »

It would be interesting to see how a tuned ROG style circuit would stack up againts this.
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Post by KMG »

Continue of the story - laser engraved G247 box before drilling holes
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To be continued...
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Post by KMG »

Inside view
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Front view
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Post by KMG »

Reamping samples.
Tone controls at preamp in middle position, "Presence" and "Depth" at PA also in middle position.
Digits after channel name represents "Gain" setting.
http://milas.spb.ru/~kmg/files/projects ... mp/5W4x12/
Recording path: E-MU Tracker Pre->Fet Engl->Fet PA 5W->Bull 412V+L(4x12)->Sennheiser e906->E-MU Tracker Pre
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Post by DrNomis »

Geez,this thing really rocks!!!.... :)



This would be perfect for anyone wanting to play Megadeth songs,very fat bottom end,great sounding highs,the mids are cool too,I've got to make one of these one day.... :)
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Post by KMG »

Reamping samples through Speaker simulator V30 preamp output.
Tone controls at preamp in middle position.
Digits after channel name represents "Gain" setting.
http://milas.spb.ru/~kmg/files/projects ... p/SIM_V30/
Recording path:
For files without "R" in name:
E-MU Tracker Pre->Fet Engl->Speaker simulator V30->E-MU Tracker Pre
For files with "R" in name additionally through Digital reverb engine AL3201 with dry/wet mix 50/50:
E-MU Tracker Pre->Fet Engl->Speaker simulator V30->Digital reverb engine AL3201->E-MU Tracker Pre
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Post by Davelectro »

Sounds great!

Nevertheless, I find ROG's emulations just as good with half the complexity.
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Post by RnFR »

Davelectro wrote:Sounds great!

Nevertheless, I find ROG's emulations just as good with half the complexity.

if you say so. but, i don't think even the guys from ROG would even call their designs "emulators". more like "stompboxes based on...XXX", which aren't really meant to sound just like an amp. on the other hand, these things actually sound just like the amps they are based on. check out the curves, they speak for themselves. these circuits accomplish something that is pretty much impossible to do with FETs at 9v.

i do understand that that this is a rather complex design, and not any easy build- hardly something that your average DIYer could tackle in an evening- but it actually delivers the goods.
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Adji
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Post by Adji »

Impressive design and build man! :applause:
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Post by jimosity »

What's the chance of making this a single sided PCB project? It sounds awesome.
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Post by RnFR »

it is a single sided board. there are just some SMD parts on the solder side.
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Post by DrNomis »

I was looking through all my spare parts trays at work,and found these,they are 2SK1119 Silicon N-Ch MOS Devices.... :)



I managed to find a Datasheet for these on the internet,according to the Datasheet,these are the specs :



Drain-Source Voltage =1000V

Drain-Gate Voltage =1000V

Gate-Source Voltage = +/- 20V

Drain Current (DC) =4A

Drain Current (Pulse) =12A

Drain Power Dissipation =100W

Channel Temperature +150 Degrees C

Storage Temperature Range = -55 To +150 Degrees C

I'm wondering if these devices would work in this pedal?.... :)


Here's a pic of them:
Attachments
2SK1119.JPG
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Post by KMG »

2SK1119 is vertical mosfet, mostly designed for switch applications.
2SK216 from Renesas (Hitaci)
http://ru.renesas.com/products/discrete ... p_root.jsp
Specially designed for audio applications
"Renesas provides lateral construction MOS FET optimum for high fidelity amplifier."
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Post by DrNomis »

Yeah,but those 2SK1119 should still be capable of being biased so that they operate in the linear portion of their transfer curves,and then made to work as voltage amplifiers.... :)
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Post by KMG »

At least compare their input capacitance
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