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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 Yesterday, 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, 107 views)
File Type: jpg Dienoisator_fixed#2.psrr.jpg (179.6 KB, 100 views)
File Type: jpg Fixed voltage LT1083-12.psrr.jpg (160.7 KB, 100 views)
Attached Files
File Type: asc D_Dienoiser.LT1083-12.psrr.asc (3.1 KB, 2 views)
File Type: asc D_Dienoiser.LT1083-12_LV.psrr.asc (3.1 KB, 2 views)
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Old Yesterday, 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, 101 views)
File Type: jpg Dienoisator_fixed#2.LV.psrr.jpg (237.0 KB, 94 views)
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Old Yesterday, 01:16 PM   #663
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.
Does the circuit also work for +÷10v DC from lm317/337?
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Old Yesterday, 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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File Type: jpg Fixnoiser.jpg (66.2 KB, 76 views)
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Old Yesterday, 05:35 PM   #665
kimschips is offline 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 Yesterday, 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; Yesterday at 05:57 PM.
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Old Yesterday, 06:27 PM   #667
kimschips is offline 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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