Compact Sized LME49810/11 +ThermalTrak Amp

[panson_hk]

Originally Posted by Adrculda

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?

[superR]

Maybe he wants to power his 2kW bread-toaster with a low noise, 0.01% THD 110V AC line for better taste. Who knows

[Sebastiaan]

Originally Posted by panson_hk

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

[Adrculda]

Originally Posted by panson_hk

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

[Adrculda]

Bridging Board Schematic...



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

[panson_hk]

Originally Posted by Sebastiaan

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

[Adrculda]

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

[Adrculda]

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!

[panson_hk]

Originally Posted by Adrculda

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

[Adrculda]

Originally Posted by panson_hk

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 !!!