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Old 16th October 2013, 09:29 PM   #7401
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Hi Dimkasta,
Use a LM2575 reg, much better then a LM317.
Its a switcher, but certaim an improvement.
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Old 16th October 2013, 11:27 PM   #7402
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Actually, I tried a led reference trying to get closer to 8V with the 317 and I got a bit of a surprise. The leds were flashing like a Christmas tree, which means that there are points where the motors require more than the 1.5A that the 317 offers.
That might also explain why the 2.2A 7808 sounded better and the delays in TOC reading.

So LM350 might be a better choice after all...
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Old 17th October 2013, 07:19 AM   #7403
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Yes, the motors do have a very high peak demand. I was going to try the high current capacity route and ordered a LT1083 for testing with my motor PSU, but never got round to actually trying it. I'll see if I manage to do it next week, might be interesting.
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Old 17th October 2013, 07:49 AM   #7404
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Quote:
Originally Posted by uncle_leon View Post
Yes, the motors do have a very high peak demand. I was going to try the high current capacity route and ordered a LT1083 for testing with my motor PSU, but never got round to actually trying it. I'll see if I manage to do it next week, might be interesting.
The LM350 on-paper has ~5db better ripple rejection than LT1083
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Old 17th October 2013, 07:53 AM   #7405
tvicol is online now tvicol  Romania
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The board was designed to support LT1086 as well. To my ears this is above 7808 in terms of resolution. Give it a try.

Regards,
Tibi
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Old 17th October 2013, 10:22 PM   #7406
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I tried LM350 today and gave up...

7808 sounds amazing in my current setup anyway.
If I could solve the CDR and SACD skipping thingy I would have closed the project and moved on like a happy bunny
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Old 18th October 2013, 10:22 AM   #7407
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Default 7808 sound amazing

Quote:
Originally Posted by dimkasta View Post
I tried LM350 today and gave up...

7808 sounds amazing in my current setup anyway.
If I could solve the CDR and SACD skipping thingy I would have closed the project and moved on like a happy bunny
Hi Dimkasta
I appreciate sharing your experiments.
It's allredy discovered from P. Daniel if I remember correctly??
Have you made ​​a modification, made by Tibi in leter # 7300?
A gane thanks for share your expiriment aqnd conclusion.
Regards
IVO-CICI
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Old 19th October 2013, 09:06 AM   #7408
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Hi Tibi,

I would like to know how many external super regulators you are able to use on your board (without redesigning it )

I ask this since you stated somewhere in June 2012 that you had malfunctions with using multiple superregs and advised only 8 volt.

So I am talking about the very first boards that went out.....since I may get my hands on one of those and would like to experiment.

Respect so far for your achievements
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Old 19th October 2013, 09:16 PM   #7409
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Damn I have destroyed Q3 trying to desolder it....

Tibi can you please verify that BC848B,215 NXP Semiconductors | Mouser is a valid replacement?

Thanks
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Old 21st October 2013, 06:09 AM   #7410
tubo is offline tubo  Philippines
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Hi guys,

ive been playing with a 50 ohm coax attenuator with a 50 to 75 ohm matching pad for the spdif output. I didn't like the results. It took away the dynamics and details. I'll be playing with a pipad soon. Ill be using caddocks in shunt position and shinkoh or riken on the series.

what are you guys using on the spdif output?
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