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Old 24th February 2012, 02:04 AM   #571
Daniel(Del) is offline Daniel(Del)  Brazil
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Quote:
Originally Posted by jacco vermeulen View Post
100mA bias, Burp too !
Sorry, what do you mean?
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Old 24th February 2012, 09:04 AM   #572
rdk845 is offline rdk845  United States
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Quote:
Originally Posted by Daniel(Del) View Post
Sorry, what do you mean?
I guess he means that if one wants 100 watts or so level heat dissipation in that configuation the bias needs to be ~100ma.
I was just making some quick calculation on impact of rail voltage increase in V3 and realized that I was underestimating heat sink requirement.
For example, if the bias is 1A per mosfet in Daniel's configuration, heat dissipation per channel is 1kw. My F5 has 12inch 8 inch , 1 inch long fin for 62w. For 1Kw dissipation, I would need 3.3m long heat sink!
Since many main stgream high end speakers's power requirement comes from not the overall low efficiency, but very high current requirement in low frequencis due to dips in impedance and phase rotation, one should make careful consideration of their speaker's requirements.
Of course if what you want is to drive 80db efficiency speakers to 120db, that's different stroy, but that's really not my thing!!

Last edited by rdk845; 24th February 2012 at 09:27 AM.
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Old 24th February 2012, 09:22 AM   #573
jacco vermeulen is offline jacco vermeulen  Netherlands
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Quote:
Originally Posted by Daniel(Del) View Post
Sorry
I mean that this is the Papa forum.
For sub-optimal Class AB you are in the dead wrong place, and me no explain why so, therefore the answer is Burp !
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Old 24th February 2012, 02:07 PM   #574
UKToecutter is offline UKToecutter  United Kingdom
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F5 Turbo Circuit Boards
Guys,

Back in the loop. Had no internet access yesterday when I was away.

Anyhow, here is the single Mosfet output board.

Click the image to open in full size.

Andy
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Old 24th February 2012, 02:08 PM   #575
UKToecutter is offline UKToecutter  United Kingdom
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F5 Turbo Circuit Boards
size is 38mm x 50mm
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Old 24th February 2012, 03:12 PM   #576
Westley is offline Westley  United States
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Andy,

Please change my request to 4 V3 input boards, 4 V3 output boards, and 4 PSU boards as I am building mono amps. Thank you for your excellent efforts.

Rick
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Old 24th February 2012, 03:16 PM   #577
UKToecutter is offline UKToecutter  United Kingdom
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Westly,

you'll need 2 x V3 output boards + 1 V3 input board + 1 PSU per channel.
If you're going balanced, you'll need 4 x V3 output boards + 2 x V3 input boards + 1 PSU per channel.

I think........ :-)
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Old 24th February 2012, 03:21 PM   #578
Westley is offline Westley  United States
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Andy,

Thanks. My idea is to go all out and build 4 balanced mono amps.

Rick
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Old 24th February 2012, 03:22 PM   #579
UKToecutter is offline UKToecutter  United Kingdom
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So you'll need 8 of the output boards
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Old 24th February 2012, 03:23 PM   #580
UKToecutter is offline UKToecutter  United Kingdom
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To explain.

Each out put board is for either the P or N channel mosfets, not for both.
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