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Distinction-1541 v2 complete PCB interest list
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Old 5th November 2017, 02:21 AM   #61
ryanj is offline ryanj  Australia
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Distinction-1541 v2 complete PCB interest list
Quote:
Originally Posted by ryanj View Post
No, you could use that supply, just make sure the GND output is isolated - floating.



No, aim between 26V and 27V.



I wouldn't use a dual supply because the GNDs may be connected meaning you couldn't use it for both the 8V and 26V supplies.



Sounds expensive and overkill.

Why not just get some verro board, diodes, resistors, and caps and have a go at building your own?

I've attached a sim of a circuit that is easy to build yourself on vero board. It sims at under 200uV ripple.

Ryan
Jjazz,

You may want to use a 25V + 25V transformer instead to give the LM317 a bit more headroom and increase the values of C3 C4 R4 R5 to provide better filtering. eg: 1000uF / 7R.

Cheers
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Old 5th November 2017, 06:27 AM   #62
Jjazz is offline Jjazz  Europe
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Hi Ryan!

You're right Ryan, it's very expensive, and I'm still not sure if the end result of the dac is good for me and spending less money is a good idea.
I will use the standard power supplies that I have and I will try to make this power supply. I have no knowledge of electronics, I am a component assembler, but I think that diagram is easy to understand and do with the help of a friend with that knowledge.

Thank you very much for your help, I am very grateful.
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Old 11th November 2017, 08:44 PM   #63
ryanj is offline ryanj  Australia
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Default Update

Hi Guys,

Fabrication for all orders is almost complete.

Thanks very much for giving me the opportunity to provide this service to you.

I will start accepting new orders as of now.

Ryan
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Old 2nd December 2017, 08:48 AM   #64
Jjazz is offline Jjazz  Europe
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Quote:
Originally Posted by ryanj View Post
Jjazz,

You may want to use a 25V + 25V transformer instead to give the LM317 a bit more headroom and increase the values of C3 C4 R4 R5 to provide better filtering. eg: 1000uF / 7R.

Cheers


Hi Ryan!

I retake the project in its final phase (many pieces and lots of money). I'm going to order the pieces and I have two doubts.
The first if the secondary transformer for this scheme should be + 25.0.-25?
And the other is if the resistance of 7ohm can be 2w instead of 1w and tolerance of 5%. This is ok?

Best regards
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Old 2nd December 2017, 10:16 AM   #65
ryanj is offline ryanj  Australia
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Distinction-1541 v2 complete PCB interest list
Quote:
Originally Posted by Jjazz View Post
Hi Ryan!

I retake the project in its final phase (many pieces and lots of money). I'm going to order the pieces and I have two doubts.
The first if the secondary transformer for this scheme should be + 25.0.-25?
And the other is if the resistance of 7ohm can be 2w instead of 1w and tolerance of 5%. This is ok?

Best regards
Hi Jjazz,

Yes you could use 2W at 5%, no problem.

For the transformer, yes you could use a 50V CT (25-0-25), or you could use one with two separate 25V windings.

Ryan
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Old 2nd December 2017, 10:57 AM   #66
ryanj is offline ryanj  Australia
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Default PSU

Hi guys,

I might give this set up a go. Ill try it without the zener reg also.

The darlingtons could be BD679 and BD680. The npn bjt could be MJE243G.

I've not tried this so just remember that if you build this.

The output has 1uV per division. The ripple before the cap multi is about 560mV peak to peak.

The transformer I modeled was a 24V+24V.

If I try this and it works well I might make a PCB.
Attached Images
File Type: jpg darlington cap multi zener reg.jpg (414.4 KB, 264 views)
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Old 4th December 2017, 05:22 PM   #67
Jjazz is offline Jjazz  Europe
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Hi!

I'm sure he's put somewhere, but I can't find him.

Which is the consumption of the 8 volt connection. I need it to order the transformer. What values would be appropriate.

Thanks
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Old 5th December 2017, 08:02 AM   #68
ryanj is offline ryanj  Australia
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Quote:
Originally Posted by Jjazz View Post
Hi!

I'm sure he's put somewhere, but I can't find him.

Which is the consumption of the 8 volt connection. I need it to order the transformer. What values would be appropriate.

Thanks
Current draw is about 45mA for the 8V supply.
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Old 7th December 2017, 07:39 PM   #69
new2hifi is offline new2hifi  United States
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I received by board, really impressive in all aspects, Thanks Ryan.
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Old 8th December 2017, 09:14 AM   #70
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I received by board, really impressive in all aspects, Thanks Ryan.
Really glad you like it!

I wish you all the best with your project.

Cheers.
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