My AYA-DAC ver 2.0c Accessories PCB's - Page 2 - diyAudio
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Old 9th October 2007, 03:01 AM   #11
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Following Pedja Rogic advice, I did a ver 2.0 of the transfo PCB with minimum spacing of 4mm for the HV traces as recommended into the safety regulation. The PCB is also smaller. I also added the 6th 8Vac output as it can be use into an upcoming AYA version as Pedja suggested. I think it is a better design. Thanks for the tips

See the included image. Take note I still have a few traces to do to complete the pcb. Should be done by tomorrow.

That will be the version that I will build for a few guys.

Bye...

SB
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File Type: jpg transfo pcb_ver2.0_small.jpg (52.3 KB, 879 views)
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Old 10th October 2007, 01:59 PM   #12
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Transfo PCB ver 2.0 is completed. I'll make a small change to the transfo parts list. For the 16Vac transfo I'll use a lower sec. voltage than the one originally specified. The 16Vac supplies are sinking about 120-150ma maximum, so the 1A/16Vac specified originally for the DAC are causing that the transfo is working almost on no load, so the secondary voltage is much higher. Futhermore the one I choose was for 110V/220V and was specs to give 18Vac at full load with is not the case at all in the AYA DAC. So the MT2124-ND, 18Vac secondary, 0.7A gives about 23.8Vac connected to the DAC (with 120Vac and the transfo regulation), way too high and causing overheat of the shunt regulator. The MT2120-ND, 14Vac, 0.8A will give about 18.6Vac in the same condition, almost on mark with the 18Vac maximum recommended. It will give about 17V is used with 110/220Vac. So this is the correct part to use.
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Old 12th October 2007, 12:51 AM   #13
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the photo of pbc are on under side?
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Old 14th October 2007, 10:57 PM   #14
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That is not a photo but the Eagle PCB image. Here an image of the completed PCB that other guys ask for...
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File Type: jpg transfo pcb bare_ver2_small.jpg (64.4 KB, 772 views)
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Old 14th October 2007, 11:02 PM   #15
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sorry but analog trafo input are in revers sade on peja pbc !?
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Old 18th October 2007, 12:20 AM   #16
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You probably means that the 16V and 8V outputs are not perfectly aligned with the AYA DAC PCB own input connectors.

It was almost impossible to make this happen and keep the transfo PCB not too big. If you look at the AYA DAC the 16V ac are mixed with the 8Vinputs.

One requirement for the transfo PCB, since I'm routing high voltages 120/240V, was to space the PCB traces with a minimum of 4mm everywhere! That mean a lot of PCB real estate spent just for insulation between traces.

I also tried to reduced to a minimum High voltage and low voltage traces lenght. Then to reduce cross transfo induction, the 16V transfo are mounted 90deg from the 8V transfo, mixing traces even more. Finally I also wanted to keep this PCB single side to keep all traces under the board for safety. All in all, these requirements prevented me from aligning perfectly the DAC and transfo PCB connector and keep the transfo PCB to a reasonnable size.

Never forget that we route AC voltages from the transfo PCB to the DAC. To do so it is better to use twisted wire pairs for each voltage. So we need some space between each PCB to route these twisted pairs. It is not like the transfo PCB was a DC low voltage power supply pcb, requirements were different from the start. Anyway, the connectors are almost aligned, so the lenght of twisted wires will be rather short. Don't forget that AC current will be lower than DC, so a small lenght of twisted wire won't have any real impact on supply power delivery.

Finally don't forget either that an actual custom transformer would have a lot of outputs wires that you would need to route also to the correct input conenctors.

I kind of like to think about this transfo pcb as an actual transformer, not a power supply pcb.

This is not a commercial venture here, just my own solution that I proposed to other to maybe solve the same problem that I had with the expensive custom power transformer. It is a much cheaper and easier solution. Pedja himself find it usefull.

Bye...

SB
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Old 18th October 2007, 12:25 AM   #17
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HI

fine work
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Old 18th October 2007, 12:26 AM   #18
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No problem. In fact Pedja help me to get the PCB more safe and gave me quite a few usefull comments about it. Thanks Pedja.
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Old 19th October 2007, 01:14 AM   #19
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I tested the full transfo PCB ver 2.0 with the actual AYA DAC load and refined my choice of transfo. It is working perfectly with almost exact 8 and 16Vac outputs under load.
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Old 19th October 2007, 07:30 AM   #20
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HI

what model trafo use for 8 Va ?

from my info, is important that is perfect stable the 10dc from -5v -15v can you controll this one ?


thanks
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