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Fast GB: LM4702 high power amp test board ;)

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veteran

veteran

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dfdye

dfdye

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Joined 2005
veteran said:
dfdye, maybe it won't be much bigger ;) I can place transistors in front of LM4702 (mine is running quite hot so I will need a little heatsink for it).
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Like I have said before, I disagree with the National guys saying you don't need a heat sink on this chip. I have run it without cooling for a while, but I don't think it is a good idea.

Oh, and no surprise that the board will be big! :D

My prototype output boards have been larger than I would have wanted but I think with a separate board you can be a little more efficient with the layout. Since you are working with one board, I can see the potential problems. Good luck! I am sure you will get something good.

BTW, I think you have inspired me to try Mosfets with your board.
 
dfdye

dfdye

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Joined 2005
veteran said:
This is only a draft. You can see FETs on this schematic but there is a place for TO247/SOT93 transistor with ECB pinout.

http://www.audio.webd.pl/pdf/monster_amp.pdf
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That looks like a great start, but with my limited experience, I have to ask why you have two transistors (T1 & T50) when most of the designs I have seen/used only use one. This is not questioning whether it will work, but I simply don't know the answer.
 
steven344

steven344

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dshortt9

dshortt9

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That looks like a great start, but with my limited experience, I have to ask why you have two transistors (T1 & T50) when most of the designs I have seen/used only use one. This is not questioning whether it will work, but I simply don't know the answer.


I thought there might be some advantage but after further thought I can not think of any. Works the same as one. Looks better on paper?
 
dfdye

dfdye

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Joined 2005
Quick question: What mosfets are you using? I am about to drop an order in for some other stuff and I figured I would play around with mosfets since they seem to be in the mix and working well.

Thanks!
David

PS What PCB software are you using? I have hit the size limit in the free version of Eagle and am looking at alternatives before I bite the bullet and buy a full version of Eagle.
 
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