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Old 16th June 2010, 11:15 AM   #181
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Quote:
Originally Posted by Adrculda View Post
Now gotta get busy with a Bridging card that will allow me to use 2 sets of output cards in parallel with the driver board.
You need an 8-pair output stage?
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Old 16th June 2010, 01:02 PM   #182
superR is offline superR  Netherlands
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Maybe he wants to power his 2kW bread-toaster with a low noise, 0.01% THD 110V AC line for better taste. Who knows
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Old 16th June 2010, 02:25 PM   #183
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Originally Posted by panson_hk View Post
You need an 8-pair output stage?
well this can be exciting, and a amplifier that can deliver current to any demand, often do sound better. It also will give new challenges. So many output devices will increase the Cob, and new compensation schemes might be needed to keep the system stable. I also wonder with 8 pairs, and so many diodes in the bias string, how it will affect the thermal tracking.


With kind regards,
Bas
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Old 16th June 2010, 11:30 PM   #184
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Quote:
Originally Posted by panson_hk View Post
You need an 8-pair output stage?
Its, not a need, but more like why not

BTW...
this is the Case its all going into
Hi-Fi DIY Audio Power Amplifier chassis

Toroid in "main" power supply is 182V40 - 1500VA 80V C.T. @ 18.8A with 60,000uF of capacitance for each rail.
Separate supply will be used for LME49810 ( +75V / 0v / -75V ) and regulated 5V and 12V circuit along with integrated soft start for the "main" supply

Last edited by Adrculda; 16th June 2010 at 11:46 PM.
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Old 21st June 2010, 05:46 PM   #185
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Bridging Board Schematic...

Click the image to open in full size.

Layout Coming Soon !

NOTE:
1.- This board is setup to driven by LME49810 feed from a separate power supply to reach peak efficiency and sound quality.
2.- C1-C6 -> 5uF 250V Ceramic or Film
3.- R1-R3 -> 0.3Ohm 1/4W

Last edited by Adrculda; 21st June 2010 at 05:54 PM. Reason: Note added
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Old 21st June 2010, 09:29 PM   #186
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Originally Posted by Sebastiaan View Post
well this can be exciting, and a amplifier that can deliver current to any demand, often do sound better. It also will give new challenges. So many output devices will increase the Cob, and new compensation schemes might be needed to keep the system stable. I also wonder with 8 pairs, and so many diodes in the bias string, how it will affect the thermal tracking.


With kind regards,
Bas
Hi Bas,

I only use four diodes in my four-pair output. The tracking is pretty good.

Panson
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Old 21st June 2010, 10:30 PM   #187
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Im gonna Stop littering this thread now as i started my OWN build thread that can be found HERE...

Keep up the good work Panson
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Old 30th June 2010, 11:20 PM   #188
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Panson...
We need to work out a more detailed BOM as its a nightmare to find parts.
Digikey only carries a few, but mostly are bulk quantities ( 10 or more ) specially for the 1% stuff!
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Old 1st July 2010, 10:07 AM   #189
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Originally Posted by Adrculda View Post
Panson...
We need to work out a more detailed BOM as its a nightmare to find parts.
Digikey only carries a few, but mostly are bulk quantities ( 10 or more ) specially for the 1% stuff!
Adrculda,

Which parts you have difficulty to source? 1 % stuff are mainly common 1 % metal film resistors.

Panson
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Old 2nd July 2010, 01:01 AM   #190
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Originally Posted by panson_hk View Post
Adrculda,

Which parts you have difficulty to source? 1 % stuff are mainly common 1 % metal film resistors.

Panson
On this side of the "pond" its not that common to find and most of them require multiples of 10 for the 1% items. The "common" parts are 5% and 10% parts which are used by most people. Mainly the biggest issue is the caps. Most WIMA are hard to find around here. The only source i know for that is Mouser

Digikey and Mouser is the ones i use mostly for parts as the local supply stores are retarded and most want me to order multiples of 250 and they can only get 2%.
None the less this same store wanted to charge me $12 for EACH ThermalTrak !!!

Last edited by Adrculda; 2nd July 2010 at 01:04 AM.
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