2DIFFET amplifier

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Possible bias tracking. The IRFP240 and IRFP9240 output devices also need to be matched for Vgs

 

[meanman1964]

Harrison,take a look at the specs of IRFP9140 is matching much better with the IRFP240

 

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Thanks. Will do that

kind regards,

Harrison.

Harrison,take a look at the specs of IRFP9140 is matching much better with the IRFP240

 

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Had a look at it. Its a coin toss. Without need for thermal tracking the IRFP9140 has more current capability. However if thermal tracking is required the IRFP9240 may be better.

 

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A design note that uses 22 ohm gate resistors

http://www.ti.com/general/docs/lit/getliterature.tsp?literatureNumber=snaa058b&fileType=pdf

Another design note that examines the different output mosfets and makes suggestions on gate resistors based on input topology and also examines thermal tracking

http://www.ti.com/litv/pdf/snaa045a
http://www.ti.com/litv/pdf/snaa031a

Both contain pcb examples

 

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Treats

 

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Step 1: Splash paint onto canvas

Just like art, the artist splashes paint on the canvas.....and then images start to appear

 

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Step 2: Move that stick with horse hair on it

Kindly make suggestions, complaints, commendations, concerns, worries, congratulations etc

Yes the silk will be cleaned up

 

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The PCBs will be serviced in groups such as 20s so that those who reserved first dont have to wait for others. http://www.diyaudio.com/forums/vendors-bazaar/242311-2diffet-type-2-pcbs-100-a.html. Although am not commenting at the thread am watching it

 

[meanman1964]

Kindly make suggestions, complaints, commendations, concerns, worries, congratulations etc

Yes the silk will be cleaned up

Personaly I don't like the way you located the power fets.What's wrong with Alexmm his layout?

 

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Lets have a little flavour , some mix and match ?

Hi Alex send me the layout files to info@harrisonaudiolabs.com

As the 100 PCBs will be serviced in batches of 20. Well the first batch can be one PCB and the next can be another

kind regards,

Harrison.

Personaly I don't like the way you located the power fets.What's wrong with Alexmm his layout?

 

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Go for it

Have fun

 

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silk cleaned up

Silk cleaned up

 

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The schematic

The first 20 will print using this schematic and above layout. Time estimate to print 1 month

 

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Expires Dec 10 2013

Let me start a tradition.

The first person to post their complete build of this amplifier and a review of it gets a token of $70.

kind regards,

Harrison.

 

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Gerbers

Gerbers

 

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sample BOM

sample BOM

 

[joshvi]

Rcvd the packet

Thanks

Joshvi

 

[OnAudio]

Pleasure . Looking forward to your feedback

Rcvd the packet

Thanks

Joshvi

 

[jkuetemann]

Apparently Christmas has come early. A little surprise package arrived today.