SOAP EVOLUTION - Simple OpAmp Pre

zei · 2nd February 2010, 10:27 AM

This aint no revolution, however it is the SOAP Evolution ..

After some time of silence i now have tuned the SOAP preamp to a more complete version.

There was some request to have it even more simpel then the MKIII but i decided that it already was very simple (and cheap).

This version contains a full onboard PSU. Onboard trafo, Dual discrete rectifier, room for more smooting caps.
The in/out caps has switched placed for placement reason. (Out caps are generelly bigger)

Grounding has been optimized even further.

This version will make installation a piece of cake with less cabling.

Testing will follow shortly.

A first glance on how it looks..

/JZ

zei · 07:56 PM

Schematics and layout..

Sorry for the terrible slow loading of the pics. pic server seems worse then ever..

zei · 2nd February 2010, 08:00 PM

/JZ

AndrewT · 10th March 2010, 11:27 AM

can you insert a separate ground track for C5+C6?
The opamp decoupling shares the signal in your present layout.

zei · 10th March 2010, 07:14 PM

Hi AndrewT

Thanx for the tip and heads up..

Proberly not without going 2layer..
Even if it looks like a 2 layer design i only made the groundtrace red to be able to "see" it easier. It is made with one copper layer so that anyone can make there own. Keep it simple

However, Even without AndrewT,s nanooptimized grounding.. It has a pitchblack deadsilent background.. No groundnoise, hum or whatever..

If anyone want to give it a try, PM me for a PDF of the layers..

I maaaaybe maybe will have a bunch of these promade.. maybe.

/JZ

tomchr · 10th March 2010, 11:36 PM

I would route the ground for the 100k R12, R13 separately and not share it with the decoupling ground for the op-amp. You should be able to weave it through on the bottom (blue) layer. Same for R1, R6.

If you stay with the board as-is, I suggest dropping the top (red) traces to the bottom (blue) layer and having the board made with only one layer. I don't see any reason to go through the expense of a 2-layer board unless you have to. I think even with my mods above, you might be able to make it with one layer.

~Tom

zei · 11th March 2010, 08:22 AM

Hi Tom.

Thanx for the ground routing tip. i,ll see if i think it is worth it

And excuse my english, Maybe i explain to poor but in the Answer to AndrewT,s post i stated that this is in fact a one layer design.
I have only the groundlayer i "red" (top layer)so that it is easier to see

If/when sent to a PCB factory i,ll change so that all is on the same layer.

/JZ

jaste · 12th March 2010, 09:09 AM

What´s the size of the board?

zei · 14th March 2010, 03:18 PM

I,ll messure it tomorrow..

Thanx

/JZ

2nd February 2010, 10:27 AM	#1
zei diyAudio Member Join Date: Feb 2005 Location: Gothenburg, Sweden	SOAP EVOLUTION - Simple OpAmp Pre This aint no revolution, however it is the SOAP Evolution .. After some time of silence i now have tuned the SOAP preamp to a more complete version. There was some request to have it even more simpel then the MKIII but i decided that it already was very simple (and cheap). This version contains a full onboard PSU. Onboard trafo, Dual discrete rectifier, room for more smooting caps. The in/out caps has switched placed for placement reason. (Out caps are generelly bigger) Grounding has been optimized even further. This version will make installation a piece of cake with less cabling. Testing will follow shortly. A first glance on how it looks.. /JZ __________________ Tala är tiga, silver är guld

2nd February 2010, 07:55 PM	#2
zei diyAudio Member Join Date: Feb 2005 Location: Gothenburg, Sweden	Something more.. Schematics and layout.. Sorry for the terrible slow loading of the pics. pic server seems worse then ever.. __________________ Tala är tiga, silver är guld Last edited by zei; 2nd February 2010 at 07:56 PM. Reason: Bad pic.. new coming up

2nd February 2010, 08:00 PM	#3
zei diyAudio Member Join Date: Feb 2005 Location: Gothenburg, Sweden	/JZ __________________ Tala är tiga, silver är guld

10th March 2010, 11:27 AM	#4
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	can you insert a separate ground track for C5+C6? The opamp decoupling shares the signal in your present layout. __________________ regards Andrew T.

10th March 2010, 07:14 PM	#5
zei diyAudio Member Join Date: Feb 2005 Location: Gothenburg, Sweden	Hi AndrewT Thanx for the tip and heads up.. Proberly not without going 2layer.. Even if it looks like a 2 layer design i only made the groundtrace red to be able to "see" it easier. It is made with one copper layer so that anyone can make there own. Keep it simple However, Even without AndrewT,s nanooptimized grounding.. It has a pitchblack deadsilent background.. No groundnoise, hum or whatever.. If anyone want to give it a try, PM me for a PDF of the layers.. I maaaaybe maybe will have a bunch of these promade.. maybe. /JZ __________________ Tala är tiga, silver är guld


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10th March 2010, 11:36 PM	#6
tomchr diyAudio Member Join Date: Feb 2009 Location: Greater Seattle Area	I would route the ground for the 100k R12, R13 separately and not share it with the decoupling ground for the op-amp. You should be able to weave it through on the bottom (blue) layer. Same for R1, R6. If you stay with the board as-is, I suggest dropping the top (red) traces to the bottom (blue) layer and having the board made with only one layer. I don't see any reason to go through the expense of a 2-layer board unless you have to. I think even with my mods above, you might be able to make it with one layer. ~Tom

11th March 2010, 08:22 AM	#7
zei diyAudio Member Join Date: Feb 2005 Location: Gothenburg, Sweden	Hi Tom. Thanx for the ground routing tip. i,ll see if i think it is worth it And excuse my english, Maybe i explain to poor but in the Answer to AndrewT,s post i stated that this is in fact a one layer design. I have only the groundlayer i "red" (top layer)so that it is easier to see If/when sent to a PCB factory i,ll change so that all is on the same layer. /JZ __________________ Tala är tiga, silver är guld

12th March 2010, 09:09 AM	#8
jaste diyAudio Member Join Date: Dec 2005 Location: Stockholm	What´s the size of the board?

14th March 2010, 03:18 PM	#9
zei diyAudio Member Join Date: Feb 2005 Location: Gothenburg, Sweden	I,ll messure it tomorrow.. Thanx /JZ __________________ Tala är tiga, silver är guld

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