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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 4th June 2021, 02:27 PM   #2221
Trileru is offline Trileru  Romania
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I think the idea is to not use capacitors in parallel that are more than x100 difference in value.
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Old 20th June 2021, 09:57 PM   #2222
WLA is offline WLA
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Hi guys,
very nice and long tread! I did not have time to read it all.
Clever circuit!
I think I have seen something similar in the past but can't remember exactly where.
Anyway, I just put together the 1 transistor circuit and got good results - 30dB lower noise (5Hz - 20kHz) but the transition response is not impressive, which means a constant very slow oscillation in the real world, approximately 0.5uV per 1mA output current.
Has anyone encountered a similar behavior or it's just my layout.
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Old Yesterday, 08:18 AM   #2223
Elvee is online now Elvee  Belgium
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Do you mean a real VLF oscillation, or simply noise?
VLF oscillation can occur if the ratio of the coupling capacitors (220µ & 22µ) is significantly smaller than ~10.
The HF limit of the correction is determined by the compensation cap: the larger, the lower
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Old Yesterday, 05:30 PM   #2224
WLA is offline WLA
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Thanks for the prompt and helpful reply!!!
In attempt to improve he transient response and overshooting I reduced the capacitance of the input capacitor. Maybe that was the reason for the very low frequency oscillation (1-2Hz).
I did't read the whole tread and I used the circuit in the opening post. Is that the final design?
Thanks again
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Old Yesterday, 07:25 PM   #2225
Elvee is online now Elvee  Belgium
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The first diagram is OK, but the final, recommended version is this one:

Click the image to open in full size.

For a regular 317, R3 should be zero.

In principle, reducing C1 should increase the stability and reduce the overshoot, but I didn't test extreme values.

I recommend you start with the nominal values, and once everything works as expected, you can begin to tweak, to improve your preferred aspects.
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Old Yesterday, 07:48 PM   #2226
WLA is offline WLA
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Great!
Thanks again
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Old Today, 02:50 AM   #2227
dvd7900 is offline dvd7900  United States
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Quote:
Originally Posted by Elvee View Post
The first diagram is OK, but the final, recommended version is this one:

For a regular 317, R3 should be zero.

In principle, reducing C1 should increase the stability and reduce the overshoot, but I didn't test extreme values.

I recommend you start with the nominal values, and once everything works as expected, you can begin to tweak, to improve your preferred aspects.

Zero for R3 - How about for the 337 ? or a 5 amp 338 ?


Will reducing C1 to 10uf alter performance in any negative way ?
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