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Old 25th July 2013, 05:36 AM   #1
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Default 2DIFFET amplifier

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Its about time we gave this one a thread
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Last edited by OnAudio; 25th July 2013 at 05:40 AM.
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Old 5th August 2013, 02:17 PM   #2
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Default PCB ideas welcome

Hi members am thinking of producing 100 free PCBs for this one. Any pcb ideas? The output devices will be TO247.

PCB ideas very much welcome.

kind regards,

Harrison.
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Old 5th August 2013, 05:33 PM   #3
alex mm is offline alex mm  Romania
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......C2 andC3 connected to ground ? should be, not across B , C ?

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Old 5th August 2013, 11:18 PM   #4
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Harrison seems to have a penchant for shunt compensation. Guess it works but is rather unkind to the VAS. I found on my SYMEF build I had to reconfigure the compensation from shunt to miller.
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Old 6th August 2013, 06:07 AM   #5
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Hi Alex, good to see you. Shunt or miller both are valid. Looking forward to your PCB ideas

Hi Jason, yes could have used the miller instead of shunt, but ended up preferring the shunt where possible.

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Old 6th August 2013, 12:01 PM   #6
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Don't get me wrong here, Harrison, I'm not saying shunt compensation is evil and wrong. I agree that both methods of compensation, shunt and miller, among others being discussed elsewhere are valid methods of compensation. I just think that shunt is more of a 'brute force' method and miller is more elegant a solution.
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Old 6th August 2013, 01:30 PM   #7
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Default Hi Mr Harrison !

SYM-DIFF I have an idea pcb like this
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Old 8th August 2013, 07:34 AM   #8
Holgi is offline Holgi  Germany
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I tried a variant allowing the Vbe multiplier tranny to be mounted on the heat sink

2DIFFET_silk_screen.JPG
2DIFFET_bottom.JPG

Pretty sure Alex can do a more sophisticated layout, anyway wanted to pay my 2ct.

BR,
Holgi
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Old 8th August 2013, 09:43 AM   #9
Holgi is offline Holgi  Germany
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Small Update to bottom layer (I missed one connection )

2DIFFET_bottom.JPG
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Old 8th August 2013, 03:40 PM   #10
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Hi student sound,

That is one very compact design . Some tracks need a bit of widening to carry the supply and output current . Thank you for joining the quest. Kindly give me more time during weekend to have a look at it just took a peek.

Hi Holgi,

Looking good. Could it be that you have followed SYMEF PCB Type1development . For 2DIFFET thermal runway should not be a problem. So only mosfets need to be on main heatsink. However if thermal/bias tracking is needed then the bias stage will have to be redesigned. Thank you for joining the quest. Kindly give me more time during weekend to have a look at it just took a peek.

kind regards,

Harrison.
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