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D-Noizator: a magic active noise canceller to retrofit & upgrade any 317-based V.Reg.
D-Noizator: a magic active noise canceller to retrofit & upgrade any 317-based V.Reg.
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Old 26th March 2020, 02:38 PM   #651
diegomj1973 is offline diegomj1973  Argentina
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Quote:
Originally Posted by zenmastering View Post
See post 409/410 on page #41
Thanks zenmastering!!!
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Old 28th March 2020, 01:10 PM   #652
gillougillou is offline gillougillou  France
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Very interesting

Perhaps a group buy?

Gilles:-)
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Old 28th March 2020, 01:41 PM   #653
dotneck335 is offline dotneck335  United States
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Quote:
Originally Posted by zenmastering View Post
See post 409/410 on page #41
Hmmmm...that's interesting; I had not seen that post---thanks for pointing it out. Has anyone actually BUILT and tested that circuit?
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Old 28th March 2020, 02:53 PM   #654
Elvee is offline Elvee  Belgium
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I don't think so, but I am going to make a quick breadboard sanity check: no detailed measurements, but a basic, functional test. This should be enough to validate the concept.
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Old 28th March 2020, 08:14 PM   #655
Elvee is offline Elvee  Belgium
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Tested OK.

I take the opportunity to rectify one or two mistakes:

D-Noizator: a magic active noise canceller to retrofit & upgrade any 317-based V.Reg.-dienfix-png

C5 needs to be reversed
R3 should be returned to the collector of Q2 to increase the Vce
R3 could be larger than 180K for the same reason

A compensation cap is required, as for other versions; a few nF is sufficient. 10nF is safe.
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Old 28th March 2020, 09:39 PM   #656
kimschips is offline kimschips  Denmark
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Quote:
Originally Posted by Elvee View Post
Tested OK.

I take the opportunity to rectify one or two mistakes:

Click the image to open in full size.

C5 needs to be reversed
R3 should be returned to the collector of Q2 to increase the Vce
R3 could be larger than 180K for the same reason

A compensation cap is required, as for other versions; a few nF is sufficient. 10nF is safe.
Thx for the great thread I am also asking for a group buy and some test result?
What about sound quality?
Could it be a great upgrade for my cheep volume with lm317/337 feeding PGA2310?
Thanks again
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Old 28th March 2020, 10:39 PM   #657
carlmart is offline carlmart  Brazil
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Elvee,

Do you have an LTSpice model for the 7815?
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Old 28th March 2020, 11:33 PM   #658
Sadface is offline Sadface  New Zealand
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Quote:
Originally Posted by kimschips View Post
Thx for the great thread I am also asking for a group buy and some test result?
What about sound quality?
Could it be a great upgrade for my cheep volume with lm317/337 feeding PGA2310?
Thanks again
Hi Kimschips
I designed a dual rail board using lm317/337.

Post 518 page 52.

There are some gerber files that can be used to order pcbs from a PCB house like JLCpcb.

There is also a mouser BOM.

I can verify that the board works but we don't yet have noise figures. I'm waiting on Carlmart to do some noise measurements on one of my boards.
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Old 29th March 2020, 03:40 AM   #659
diegomj1973 is offline diegomj1973  Argentina
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Quote:
Originally Posted by Elvee View Post
Tested OK.

I take the opportunity to rectify one or two mistakes:

Click the image to open in full size.

C5 needs to be reversed
R3 should be returned to the collector of Q2 to increase the Vce
R3 could be larger than 180K for the same reason

A compensation cap is required, as for other versions; a few nF is sufficient. 10nF is safe.
Thanks Elvee for testing it and correcting the polarity of C5.

Have you tried R2 at 820 ohms, since that would be the recommended value for Vout = 15 V?. That would involve testing with the connection of R3 in the original schematic position and with the value at 330K, although, perhaps, it will reduce VCE (Q2) to near saturation values.

Possibly need to be implemented with a single transistor, similar to the denoiser (with less performance).

Regards

Last edited by diegomj1973; 29th March 2020 at 04:04 AM.
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Old 29th March 2020, 09:17 AM   #660
Elvee is offline Elvee  Belgium
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Quote:
Originally Posted by kimschips View Post
What about sound quality?
Could it be a great upgrade for my cheep volume with lm317/337 feeding PGA2310?
Thanks again
The sound quality will very much depend on the context: for example, a circuit using only good opamps will probably see no improvement, but many discrete circuits are very sensitive to the supply quality.
I have no idea about the PGA2310, and the datasheet does not give a PSRR spec

Quote:
Originally Posted by carlmart View Post
Elvee,

Do you have an LTSpice model for the 7815?
No, I don't, but it is probably available on the Yahoo LTspice group

Quote:
Originally Posted by diegomj1973 View Post
Thanks Elvee for testing it and correcting the polarity of C5.

Have you tried R2 at 820 ohms, since that would be the recommended value for Vout = 15 V?. That would involve testing with the connection of R3 in the original schematic position and with the value at 330K, although, perhaps, it will reduce VCE (Q2) to near saturation values.

Possibly need to be implemented with a single transistor, similar to the denoiser (with less performance).

Regards
As I said, I just made a functional test and no measurements, but resistors values could (and should) be suited to the supply voltage.

It would work with a single transistor, but the 100 ohm would shunt much of the gain away, and I think 2 transistors are preferable
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