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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 29th March 2020, 11:06 AM   #661
carlmart is offline carlmart  Brazil
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OK, until I find more generic LM7815 models, I'm using LT1083-12 models for these simulations of Diego's fixed voltage Dienoisators.

For illustration I have also simulated the fixed regulator with no Dienoisator.

You can also see what happens with the PSRR curve when R3 is changed from 180K to 330K, with a flattened extension on the below 10Hz frequencies, down to 7Hz.
Attached Images
File Type: jpg Dienoisator_fixed#1.psrr.jpg (182.0 KB, 550 views)
File Type: jpg Dienoisator_fixed#2.psrr.jpg (179.6 KB, 510 views)
File Type: jpg Fixed voltage LT1083-12.psrr.jpg (160.7 KB, 503 views)
Attached Files
File Type: asc D_Dienoiser.LT1083-12.psrr.asc (3.1 KB, 7 views)
File Type: asc D_Dienoiser.LT1083-12_LV.psrr.asc (3.1 KB, 6 views)
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Old 29th March 2020, 11:26 AM   #662
carlmart is offline carlmart  Brazil
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These are Elvees' version PSRR curves, exchanging different values for R3, as Diego suggested.

Other simulations in order, but most of all breadboard or prototype board assembly, and actual measurements to confirm or not the simulation results.
Attached Images
File Type: jpg Dienoisator_fixed#1.LV.psrr.jpg (180.8 KB, 513 views)
File Type: jpg Dienoisator_fixed#2.LV.psrr.jpg (237.0 KB, 502 views)
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Old 29th March 2020, 01:16 PM   #663
kimschips is online now 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.
Does the circuit also work for +÷10v DC from lm317/337?
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Old 29th March 2020, 02:48 PM   #664
diegomj1973 is offline diegomj1973  Argentina
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Possibly, this can be a universal form of the "Fixnoiser" for output voltages from 5 to 24 V .

D-Noizator: a magic active noise canceller to retrofit & upgrade any 317-based V.Reg.-fixnoiser-jpg
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Old 29th March 2020, 05:35 PM   #665
kimschips is online now kimschips  Denmark
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Sorry I needed the schematic from post 619 referring to lm317/337 for 10v operation

Thx
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Old 29th March 2020, 05:48 PM   #666
diegomj1973 is offline diegomj1973  Argentina
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Quote:
Originally Posted by kimschips View Post
Sorry I needed the schematic from post 619 referring to lm317/337 for 10v operation

Thx
Possibly, a start value can be 680 ohms for the resistor located between the base and emitter of the BC327 (for the LM317 regulator).

It would not be unreasonable to use a 2K trimpot instead of that same resistor, in order to find the most optimal value, similar to the Fixnoiser.

By short-circuiting the trimpot, the Dienoiser would become Denoiser!!!

Best regards

Last edited by diegomj1973; 29th March 2020 at 05:57 PM.
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Old 29th March 2020, 06:27 PM   #667
kimschips is online now kimschips  Denmark
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Quote:
Originally Posted by diegomj1973 View Post
Possibly, a start value can be 680 ohms for the resistor located between the base and emitter of the BC327 (for the LM317 regulator).

It would not be unreasonable to use a 2K trimpot instead of that same resistor, in order to find the most optimal value, similar to the Fixnoiser.

By short-circuiting the trimpot, the Dienoiser would become Denoiser!!!


Best regards
He he got it😎
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Old 4th April 2020, 06:59 AM   #668
av-trouvaille is offline av-trouvaille  Netherlands
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In post 655
D-Noizator: a magic active noise canceller to retrofit & upgrade any 317-based V.Reg.
Elvee mentions C5 needs to be reversed for the 78xx version.

In post 643 Elvee is referring to the LM317 version.
D-Noizator: a magic active noise canceller to retrofit & upgrade any 317-based V.Reg.

In that schematic the positive side of the same capacitor (now C3) is connected to the Adj-pin of the LM317. In this case the potential for C3 at the Adj-pin is higher than at the noise-filter side. So there the direction of mounting C3 should stay as is.
Correct?
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Old 9th April 2020, 03:35 PM   #669
av-trouvaille is offline av-trouvaille  Netherlands
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Can anyone please confirm - or negate - my question in the previous post?
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Old 9th April 2020, 07:09 PM   #670
Elvee is online now Elvee  Belgium
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Quote:
Originally Posted by av-trouvaille View Post
In that schematic the positive side of the same capacitor (now C3) is connected to the Adj-pin of the LM317. In this case the potential for C3 at the Adj-pin is higher than at the noise-filter side. So there the direction of mounting C3 should stay as is.
Correct?
Yes: with adjustable regulators, the adj. pin will normally be always more positive than the collector of the correction transistor.
With fixed regulators and GND-referenced regs (the ones having an explicit GND pin), the situation is reversed
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