My LME49600/49610 PCB design - diyAudio
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Old 3rd July 2012, 05:47 PM   #1
AAK is offline AAK  United States
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Default My LME49600/49610 PCB design

Hi All

Attached is a pic of my 4-layer multi-channel LME49600/49610 PCB design originally inspired by diyAudio Member OPC after seeing his design on the following thread.

The Wire - Low Power Ultra High Perfromance (LPUHP) 16W Power Amplifier

I originally designed the PCB for a 10 channel mini surround sound system but I also added provisions for multiple channel configurations. The PCB can be configured using solder jumpers underneath the board to operate in mono using up to 24 LME49600/LME49610 devices in parallel or stereo with a maximum of 12 devices in parallel per channel to twelve separate channels with a pair of LME's per channel and everything in between. The input op-amps can be paralleled for additional drive and noise reduction when configured in mono or stereo. There's also DC speaker protection on-board for each individual channel. The circuit also prevents speaker thumping when power is turned on and off. The relays can bypassed or paralleled using solder jumpers to lower relay contact resistance if desired.

I've yet to have the PCB manufactured but If there's enough interest from members of this great forum I'd be more than happy to have the PCB manufactured tested and made available.

I also have a PS to power it. Two PS are required one for each side.

Best Regards,

Al
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File Type: jpg LME49600_PCB.jpg (274.4 KB, 565 views)
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Last edited by AAK; 8th July 2012 at 02:39 PM. Reason: just adding some additional details
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Old 3rd July 2012, 05:58 PM   #2
qusp is offline qusp  Australia
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you realize you dont need current sharing resistors yeah?
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Old 3rd July 2012, 06:00 PM   #3
AAK is offline AAK  United States
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Hi qusp,

You mean on the outputs? If so, there are none. Only the input op-amps have optional current sharing resistors.
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Old 3rd July 2012, 06:02 PM   #4
AAK is offline AAK  United States
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What appears to be resistors pads are actually solder jumpers to parallel the outputs depending on what output channel configuration is selected.
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Last edited by AAK; 3rd July 2012 at 06:15 PM.
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Old 4th July 2012, 08:01 AM   #5
qusp is offline qusp  Australia
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aha sorry yes its the optional pads for paralleling I was seeing as a place for current sharing resistors. what sort of speakers were you thinking to use for it in multichannel mode? very efficient ones I guess. interesting design anyway, I would have liked to see the psu on the same board. all the same since I have a fair few left over buffers I may grab one of these.

what topology is the supply board you have planned? are you also using lme49990 for the VAS? as this is pretty low current, to keep things neat, you could look at using an optional DSUB25 connector for the power umbilical and output

Last edited by qusp; 4th July 2012 at 08:05 AM.
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Old 4th July 2012, 07:42 PM   #6
AAK is offline AAK  United States
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Hi qusp,

For the multichannel mode the small speakers I'm using are actually not that efficient at about 82db/1watt/1m. But they don't need to be since the speakers are positioned relatively close to my ears.

I kept the PS external for added flexibility to select your own PS which seems pretty popular these days. If it was mono like OPC's design I'd go on-board for sure like I did with my version of SymAsym. Also the PCB measures 7.6" x 3.6", adding the PS on-board would of made the board quite a bit larger adding to the overall cost. I'm also a stickler for neatness, one or two on-board PS what of really cluttered things up.

For the PS I'm using the same topology that OPC used on his design. It's simple enough and proven so I built by own PCB pictured below. I'll being using a 25VA transformer not 15VA as pictured. For added current I'll use LT1085/1033 3 amp regulators instead of the LM317/337.

I'm also using the LME49990 for the front end.

Thanks for your idea of using DSUB25 connector, definitely something to think about.

Al
Attached Images
File Type: jpg CIMG1952.JPG (245.6 KB, 453 views)
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Last edited by AAK; 4th July 2012 at 07:46 PM.
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Old 4th July 2012, 07:59 PM   #7
Boscoe is offline Boscoe  United Kingdom
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Quote:
Originally Posted by AAK View Post
Hi qusp,

For the multichannel mode the small speakers I'm using are actually not that efficient at about 82db/1watt/1m. But they don't need to be since the speakers are positioned relatively close to my ears.

I kept the PS external for added flexibility to select your own PS which seems pretty popular these days. If it was mono like OPC's design I'd go on-board for sure like I did with my version of SymAsym. Also the PCB measures 7.6" x 3.6", adding the PS on-board would of made the board quite a bit larger adding to the overall cost. I'm also a stickler for neatness, one or two on-board PS what of really cluttered things up.

For the PS I'm using the same topology that OPC used on his design. It's simple enough and proven so I built by own PCB pictured below. I'll being using a 25VA transformer not 15VA as pictured. For added current I'll use LT1085/1033 3 amp regulators instead of the LM317/337.

I'm also using the LME49990 for the front end.

Thanks for your idea of using DSUB25 connector, definitely something to think about.

Al
I think i've seen that PSU layout somewhere else

I'm thinking of designing an amp using two LME49990 bridged front end driving the LME49600 buffers driving some nice output devices! 18V rails. Ultra low distortion about 50W 8R perhaps? Tweeter amp? All SMD perhaps?
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Old 4th July 2012, 08:30 PM   #8
qusp is offline qusp  Australia
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yeah look with an identical PSU right down to pretty much the exact layout, identical parts in the front end, this whole thing is cutting a bit close to the bone IMO, consider me uninterested.

publishing a thread asking about doing a run of PCBs under these conditions, linking to the front page and measurements, its really not cool IMO. its one thing to take inspiration from someone, given the performance of this amp its understandable; but to just transpose the whole thing with the addition of a servo and talk about doing a GB on the PCBs, while Owen is trying to make a go of the amp as a product?.... is going too far.

pretty sure you dont have bad intentions, but did you really think this through?

Last edited by qusp; 4th July 2012 at 08:38 PM.
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Old 4th July 2012, 08:59 PM   #9
AAK is offline AAK  United States
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The PS supply is not what makes OPC's design unique, Its the amp section and the overall design. There is nothing special in the PS. The difference in his PS than what I've done in the past is that he used SMDs underneath the board to make it more compact but that's about it. The LM317/337 circuit that he used can be found in the datasheets and has been implemented countless times. I seriously doubt OPC will mind, but if so I wont make it available to those that may be interested in my multi-channel PCB which is completely different than OPC's mono design.
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Last edited by AAK; 4th July 2012 at 09:19 PM.
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Old 4th July 2012, 09:00 PM   #10
Boscoe is offline Boscoe  United Kingdom
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Although very morally wrong especially on forums based on sharing info an work anything is fair game without any legal rights IMO.
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