Hey guys...
After all the screwing around and tweaking amps, time to build my own now
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.
After all the screwing around and tweaking amps, time to build my own now
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.
- 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.
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.
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
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
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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
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
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...
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
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this must be fairly new.
Last time I wrote asking if I could pay rather than request within the sample limit.
They replied rather nicely, that I should continue using the samples scheme and just pay the postage on the order.
FedEx was here today...
AGAIN
Still missing 5 x NJL4302
But have everything else
AGAIN
An externally hosted image should be here but it was not working when we last tested it.
Still missing 5 x NJL4302
But have everything else
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More Stuff from digikey....
Now off to Mouser and Get all my Wima Stuff...
An externally hosted image should be here but it was not working when we last tested it.
Now off to Mouser and Get all my Wima Stuff...
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Final Powersuply schematic, cap bank will be on a separate board...
An externally hosted image should be here but it was not working when we last tested it.
Sorry, your schematic tells me nothing.
"Bridging" means to me: two amps running phase opposite into a load...
It seems you mean something else.
Will you feed 8 pairs with one driver transistor only or two?
- Status
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