Build Thread: LME49810 + 8 Pairs ThermalTrack

[Adrculda]

Hey guys...
After all the screwing around and tweaking amps, time to build my own now :P
SO this is gonna be my lil "LOG" for the build as i go.

Boards were purchased from Panson's website based on his Initial Series Amp based around the LME498XX chips based on a modular input and output sections.
All i can say to him is thanks a bunch buddy, you saved me a lot of headaches and work! I can't wait to have them in my hands so i can start populating them slowly as the parts arrive from the different vendors and manufacturers.

Onto the specs....

LME49810/49830/49811 Driver Board - 2 Boards were ordered
* Compatible with LME49810 and LME49830
* Two-layer, FR-4 with 2 oz copper weight, Gold Plated
* 1 %, 0.25 W metal film resistors
* Silver mica compensation cap
* Onboard electrolytic filtering caps

Power Board for Four-Pair ON Semi ThermalTrak™ Transistors - 4 Boards were ordered

* Triple Emitter Follower Output Topology
* Work for LME49810 and LM49811
* Two-layer FR-4 board with 2-oz copper, Gold Plated
* Wide Copper Tracks for High-Current Handling
* Symmetry Layout Eliminating Induction Interference

Now here comes the fun part...
I will be using 2 Power Boards per Channel, which leads to one Simple Solution...
Build a Router/Bridging board!
Also, I would incorporate an independent power supply to drive the LME's right off this board for increased headroom and reduced THD.

[Adrculda]

- Case
As everyone else in the DIY world we sometimes have to turn to the dreaded fleabay and that's what i did and came up with this DIY HIFI Case that saves me the headaches of looking for heat sinks and maintain an overall clean look.

- Power Supply's
Main Power Transformer
Hammond 182V40
1500VA
VAC Secondary (RMS)
Series - 80V C.T. @ 18.8A
Parallel - 40V @ 37.5A
Outside Diameter 7.2"
Height 3.5"
Weight 24.97 Lbs

60,000uF Per Rail LCRC Arrangement.

Secondary Supply Transformers ( 5V and 12V )
Hammond 229D10
36VA
VAC Secondary (RMS)
Series - 10V C.T. @ 3.6A
Parallel - 5V @ 7.2A

And still on the hunt for a third for the LME supply...
Shooting for 175V supply for the LME's with 2200uF per rail.
Will try and keep all E-caps Low ESR and will be decoupled with ceramics as well as Fused on the AC input of the supply boards.

[Adrculda]

Bridge / Router Schematic...


I think i might have to add some resistors in the Sink & Source for even current Distribution between modules.

And Last but not least...
Today's Deliveries !!!


11 x NJL4302DG
11 x NJL 4281DG
8 x MJE15031G
3 x MJE15030G
4 x MJE340G
5 x LME49810TB



GOTTA LOVE SAMPLES :P

[panson_hk]

can't wait to see your result.

[Adrculda]

Playing a Waiting game right now...
Waiting for a lot of things to show up!
Other Transistors, Case, Caps, Digikey, Mouser :s
and then theres still the choice to make if im going with Hammond or am i gonna Custom order from Plitron.

And still have to layout the power supply board and the Router / Bridging board as well

[panson_hk]

will you do output transistor matching?

[Adrculda]

Originally Posted by panson_hk

will you do output transistor matching?

I will try to match them as close as possible as i have ordered a total of 42 Transistors and that's not including the drivers ( that's another 16 to take into account ), but my equipment is not as fancy as your guys, so i will have to make due with a multimeter...

[panson_hk]

I just purchased a curve tracer (China brand at affordable price) for transistor matching and measurement. You will get 42 free samples from ON?

[bobodioulasso]

Now here comes the fun part...
I will be using 2 Power Boards per Channel, which leads to one Simple Solution...
Build a Router/Bridging board!

What do you mean? Coul you explain some more?

[Adrculda]

Originally Posted by panson_hk

You will get 42 free samples from ON?

Nope, only 10 ( 5 + 5 )
The rest i paid for, which wasn't that bad when compared to the local "hobby" shop that wanted to charge me $18.50 for EACH Thermal Track compared to the $4.40 i paid with ON!

But what was nice is they give samples of 5 units for each model, after which you can opt to buy more.

So i got:
MLT SAMPLE NJL4302DG 250 W PNP ThermalTrak™ Transistor - 5Pcs
BUY NJL4302DG 250 W PNP ThermalTrak™ Transistor - 16Pcs @ $4.40 = $70.40
MLT SAMPLE NJL4281DG 250 W NPN ThermalTrak™ Transistor - 5Pcs
BUY NJL4281DG 250 W NPN ThermalTrak™ Transistor - 16Pcs @ $4.40 = $70.40
MLT SAMPLE MJE15030G Bipolar Power NPN, 8 A, 150 V - 5Pcs
BUY MJE15030G Bipolar Power NPN, 8 A, 150 V - 3Pcs @ $0.76 = $2.28
MLT SAMPLE MJE15031G Bipolar Power PNP, 8 A, 150 V - 5Pcs
BUY MJE15031G Bipolar Power PNP, 8 A, 150 V - 3Pcs @ $0.76 = $2.28
MLT SAMPLE MJE340G Bipolar Power NPN, 0.5 A, 300 V - 4Pcs

This was from ON, and took advantage of the Program as well with National and got 5 Free LME49810's as Samples an bought 3 on the side