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Old 30th November 2012, 06:14 PM   #71
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So since my board is on it's way I made a Mouser BOM, and found the tamura transformer is on backorder.

I think this is a cross
F16-150 Triad Magnetics | Mouser

Anybody care to double check?
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Old 1st December 2012, 12:50 AM   #72
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All -

Added links for Schematics and BOM on the first post.

Happy building.

Cheers!
Subbu
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Old 1st December 2012, 04:45 AM   #73
pchw is offline pchw  United States
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Hi Subbu,

Any time frame for the US shipment?

Thanks!!
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Old 1st December 2012, 07:35 AM   #74
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Quote:
Originally Posted by randytsuch View Post
So since my board is on it's way I made a Mouser BOM, and found the tamura transformer is on backorder.

I think this is a cross
F16-150 Triad Magnetics | Mouser

Anybody care to double check?

Hello Randy

The transformer is available in digikey.com as well. Here is the link

3FD-316 Tamura | MT2106-ND | DigiKey

Cheers!
Subbu
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Old 1st December 2012, 08:52 AM   #75
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Thank you Subbu for posting BOM and schematics. I see the optional C13 and Cled are missing. Maybe you can add those ?

All, please enjoy the power supply with your DAC. Let us know how they both perform. We hope you enjoy this DAC as much as we do.
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Old 1st December 2012, 01:00 PM   #76
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Thanks Subbu for posting BOM and schematics.

works well for me powering one dac board without spdif input circuit.

the c13 does make it more stable and constant at 4.94x V.
tried a dummy load pulling about 290ma but could not get stable voltage.

what is the max current output from this psu board?
Is it possible to get more current with stable 5V voltage.

Last edited by necplusultra; 1st December 2012 at 01:16 PM.
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Old 1st December 2012, 01:25 PM   #77
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Hi it is a 250 mA 5 V power supply with current limiting. Changing the 2.2 Ohm (see datasheet of LM723) is possible but we did not limit current without a reason. The transformer is the limiting factor as it can supply 300 mA nominally. Our goal is to have a safe and low noise supply for our DAC boards, not to have burnt transformers etc. I already got mail if it can be used for Squeezebox devices but since I have none I can not tell what the current draw of such devices is.

Design parameters:

- The PSU should be small and able to supply low noise power to 2 x Subbu DAC boards
- Current should be limited in case a short appears or a DAC board fails to protect the transformer. We don't like fire in devices.
- No excessive 115 V/230 V wiring as not everyone is experienced with mains operated stuff
- the PSU should be suitable for either 115 V or 230 V mains voltage areas

I don't recommend changing the 2.2 Ohm resistor. I would recommend a small heatsink on the BD140 when powering 2 DAC boards (i.e. a balanced DAC configuration). Of course it will not hurt to use a small L shaped pieces of aluminium on the BD140 even when you only use 1 DAC board. Just make sure it will not short the BD140's lead wires.

The comment on C13 surprises me. Since I haven't received my PSU PCB's (of the final version) yet I will have to wait to check that. I added C13 for testing the final version and I added Cled for fun to those that fear noise from LEDs Point is that my luck is that I receive my boards later than most of you guys.
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Last edited by jean-paul; 1st December 2012 at 01:51 PM.
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Old 1st December 2012, 01:37 PM   #78
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thanks Jean PAul,

was wondering if I can get .5a out of this to power hifiduino as I like the size of this psu. Obviously, the tfo must be more powerful for such current.

I didn't have the BOM fuse but I did put a .5a 120v ptc fuse until the BOM fuse are ordered.

love the sound of the dac. I2s fed from amanero board. Was previously using salas shunt but I find the footprint too large for this baby.

thanks again. looking forward to V3...
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Old 1st December 2012, 01:55 PM   #79
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With a larger transformer you can supply 0.5 A. I guess it should be an off board transformer then or maybe a 5 VA version exists that fits on the board ? When using an off board transformer please use safe wiring to the PCB or go straight from the transformers primaries to the fused IEC receptacle.

Now you do the math for the current limiting resistor PCB tracks are quite wide but we havent tested the PCB for 1 A (or more) for instance. You are on your own trying stuff out.
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Last edited by jean-paul; 1st December 2012 at 02:24 PM.
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Old 1st December 2012, 02:55 PM   #80
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Hi All

I think to be abble to post some informations next week about PSU.
Received and built 2 units working perfectly (no Cled installed).
For guys using 220/240v, add a jumper to the transfo primary as shown in the attached pic
I started to get me out of my worries, so I hope to be back soon.
Regards

Phil

Transfo : http://fr.mouser.com/ProductDetail/T...rcyVjlUiStth5c
Available 17th December 2012...
Attached Images
File Type: jpg PSU V5.0 PCB HR 220.jpg (125.6 KB, 215 views)

Last edited by korben69; 1st December 2012 at 03:01 PM.
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