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Old 20th November 2013, 09:10 PM   #211
opc is offline opc  Canada
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Hi Guys,

For the transformer, BuildMeSomething is exactly right. I have found in my testing that the Antek units do not have very good load regulation which is why I suggest going up to 100VA if you are going to use one of those.

The potted PCB mount units I have from Amveco do much better at load regulation, with their 30VA unit performing on par with the 50VA from Antek.

For the voltage, definitely stick with dual 15V or lower, as going any higher will require changing the caps before the regs to 35V parts.

Also, I updated the spreadsheet to include all different gain variations and input options for the LPUHP. If people can give it a check over I would appreciate it. I'll try and get the PSU done for tonight.

Cheers,
Owen
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Old 24th November 2013, 01:00 AM   #212
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Owen,
I just stumbled on this last night and added my request to your speed sheet. I am not sure if it was closed or not. If not I will send payment. Many thanks for your excellent projects I still need to case up my original LPUHP and wire amp .

I have actually come to prefer smt to through hole when done correctly.

Bill
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Old 24th November 2013, 06:16 AM   #213
UrSv is offline UrSv  Sweden
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Quote:
Originally Posted by wirewiggler View Post
Owen,
I just stumbled on this last night and added my request to your speed sheet. I am not sure if it was closed or not. If not I will send payment. Many thanks for your excellent projects I still need to case up my original LPUHP and wire amp .

I have actually come to prefer smt to through hole when done correctly.

Bill
Post #179 with the link to the spread sheet states "Note that this list is not for new orders" so if I was you I'd wait with payment until you get a confirmation from opc.
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Old 24th November 2013, 01:55 PM   #214
opc is offline opc  Canada
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Hi Bill,

No worries... you added your name in the correct spot. I moved it to the official sheet as I was going to send out payment notices last night, but didn't get around to it.

For future reference:

Anyone can still place new board orders, but please do so on the original list:

https://docs.google.com/spreadsheet/...=sharing#gid=0

Once I'm ready, I will move your name to the official list and send a payment request. Please do not attempt to add new orders to the official list, as it's more for order tracking and for helping me keep track of what needs to be shipped and what has already gone out. The official list is here:

https://docs.google.com/spreadsheet/...rive_web#gid=0

As a side note, the first 25 orders will be shipping out this afternoon, and I hope to ship all 76 current orders by the end of this week.

Cheers,
Owen
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Old 24th November 2013, 04:31 PM   #215
rsavas is offline rsavas  Canada
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Okay, thx, so i won't walk over to the post box today!! Funny, LME49830 are back in stock at Mouser :-) before stated delivery date. No prob's lots of projects to work on now that the snow is falling here.
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Old 26th November 2013, 12:57 PM   #216
opc is offline opc  Canada
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Hi Guys,

Updated PSU BOM and schematic are now done and can be found here:

BOM:

https://docs.google.com/spreadsheet/...Xc&usp=sharing

Schematic

https://drive.google.com/file/d/0B3M...it?usp=sharing

As usual, you need to actually download the PDF to get all the embedded functionality. The Google viewer is no good.

I will consolidate all this info into a wiki over the next few days to make it easier to follow everything.

Cheers,
Owen
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Old 26th November 2013, 07:13 PM   #217
VT67 is offline VT67  Belgium
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Is it possible there are still some differences between the schematic and the BOM?
In the BOM I see C17 and C55 with different values. As output ceramic cap 22uF and noise bypass cap 1uF.
There are C28 and C93 0,1uF in the schematic but not in the BOM?

Regards
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Old 26th November 2013, 07:45 PM   #218
opc is offline opc  Canada
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Quote:
Originally Posted by VT67 View Post
Is it possible there are still some differences between the schematic and the BOM?
In the BOM I see C17 and C55 with different values. As output ceramic cap 22uF and noise bypass cap 1uF.
There are C28 and C93 0,1uF in the schematic but not in the BOM?

Regards
Good catch!

The BOM has been fixed (just the REF DES was wrong for the noise bypass caps) but I will have to update the schematic this evening.

The proper value should be the 1uF part listed on the BOM.

Thanks for checking

Cheers,
Owen
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Old 26th November 2013, 09:02 PM   #219
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Pardon my ignorance on this topic. Being a fan of the O2 (Sorry, but it did lead me here), about how much would it cost to assemble one of these amps. I am not even really sure which version I would need. My headphones are DT-770 pros and my dac would be my Odac. I assume this would call for a SE-SE config? Sorry for the ignorance again, thanks guys.
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Old 26th November 2013, 09:20 PM   #220
opc is offline opc  Canada
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Quote:
Originally Posted by Battou62 View Post
Pardon my ignorance on this topic. Being a fan of the O2 (Sorry, but it did lead me here), about how much would it cost to assemble one of these amps. I am not even really sure which version I would need. My headphones are DT-770 pros and my dac would be my Odac. I assume this would call for a SE-SE config? Sorry for the ignorance again, thanks guys.
Hi Battou62,

The total parts cost for the SE-SE amp by itself is about $26 in single unit prices if you buy from Mouser. The board costs $15 so you're looking at about $41 for the SE-SE board completely built. If you need the PSU as well, then you're looking at another $15 board and $45 in parts to build it. The grand total then would be almost exactly $100.

If people here managed to organize a group buy with about 50 kits, then you'd be looking at more like $65 in parts total.

In addition to the above mentioned parts, you will need a transformer and if you want a chassis you'll need that too. The transformer can be a 10VA Antek unit for about $10.

As for your setup, it sounds to me like an SE-SE would be the best fit.

Hope this answers your questions!

Cheers,
Owen
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