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Old 17th August 2006, 01:06 PM   #1
potepuh is offline potepuh  Slovenia
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Default fets for aleph P1.7

I am colecting parts for my new project Aleph P1.7. I was wondering hoew many fets to i need to buy to get enough matche mosftets for a stereo version(4*IRF610 and 2*IRf9610 for mono) do i need to match also the ZTX 450/550?

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Old 17th August 2006, 01:51 PM   #2
Mad_K is offline Mad_K  Norway
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I don't think you have to match anything
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Old 17th August 2006, 07:23 PM   #3
folkeb is offline folkeb  Norway
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From what I've heard you don't need to match the ZTXs, but you need to match the IRF610s and the IRF9610 as pairs. You should be able to buy pairs here on the forum Makes it a lot easier...

Good luck!
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Old 17th August 2006, 08:19 PM   #4
Mad_K is offline Mad_K  Norway
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Why would they need matching?
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Old 18th August 2006, 02:40 PM   #5
potepuh is offline potepuh  Slovenia
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Now I am a bit confused. Why not matched? Can I realy use unmatched fets?

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Old 18th August 2006, 02:53 PM   #6
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Quote:
Originally posted by potepuh


Now I am a bit confused. Why not matched?

A1.7 has output coupling caps, i.e. the output nodes see only AC.
So . . . we do not need to worry about the DC offset voltages at the outputs.
No one would blaim your matching MOSFETs.
No one would warn you about your unmatching MOSFETs, either.
Either way you could go unpon your free choice.
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Old 19th August 2006, 08:22 PM   #7
flg is online now flg  United States
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Let me try to convey 2 cents. Someone can certainly straiten me out, if I'm confused. The diffamp/balanced topology needs a + and - side doing exactly the same thing to perform at it's best. The current sources will not provide the same current without the source R's and Vth and bipolars Vbe and even Beta being exactly the same. The bias level of the gain transistors, I beleive, is set in an area of the curve, that would also complement each other's opposite action with signal present. Not operating with the same current, side for side, will also effect their gain and balanced behaviour. Yes the DC output is protected by caps for the load but the more ideal both sides are, the better the performance!
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Old 19th August 2006, 08:43 PM   #8
wim is offline wim  Netherlands
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Much bigger broblem is to get the 10uF caps! I spent a lot of time on internet (google). In do not know were to buy them, conforming the BOM, with a leadspeace of 27,5 mm.

A groupbuy mayby??
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Old 19th August 2006, 08:46 PM   #9
folkeb is offline folkeb  Norway
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I had no problem fitting BG N caps into the pcb holes.
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Old 19th August 2006, 08:53 PM   #10
wim is offline wim  Netherlands
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Thanks for your quick answer mr. folkeb.

I know to use the alternative BG-N caps, bit suppose you want to fit the 1 uF caps, were to buy them (for a good price).
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