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Quasimodo results (ONLY)
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Old 8th April 2019, 02:04 PM   #21
Michi124 is offline Michi124  Germany
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Quote:
Originally Posted by audiomusica View Post
Are such low values for Rs reasonable?
Yes, definitely. See post #5 by EUVL.
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Old 10th April 2019, 09:12 AM   #22
audiomusica is offline audiomusica  Germany
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Mark, Michi124,


thanks for verification!


I already did the calculations with the same results. As it it these first time I use this experimental approach I was unsure of the value for Rs I got.


Regards,
Michael



Quote:
Originally Posted by Mark Johnson View Post
Audiomusica, since you doubt your experimental results from No-Math Quasimodo, you have no other choice than to use math for verification.

Your numerical values of fosc (6.25E+5) and Cx (1.0E-8) indicate that the secondary self inductance L is about (6.5E-6) Henrys. We calculate L using the LC resonance equation.
The LC resonance equation: 2 * Pi * fosc = 1 / sqrt(L * C)
Plugging this value for L into equation (A.11) of the Quasimodo design note, we find
R < 12.7 ohms
Which seems to be in broad agreement with your experimental results. You were wrong to doubt them.
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Old 12th April 2019, 05:14 PM   #23
Hicoco is offline Hicoco  France
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Quasimodo results (ONLY)
Mark, this is my result for AMGIS L01-6364, 2x115V / 2x18v / 25VA, and i am confuse because Cs is 3 time Cx and no 15 time like your recommendation,
CX: 0,22uF
CS: 0,68uF
RS: 11 Ohm
fosc ~ 60kHz
I have a very hard time to check and use the Math for verification, by any chance do you have an Excel were we can enter the values we found ( Cx, Cs, Fosc) with the result of RS....for Zeta=1


Just got the PCB today See post Quasimodo 4
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Old 13th April 2019, 07:07 PM   #24
Mark Johnson is offline Mark Johnson  United States
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Quasimodo results (ONLY)
Please honor the request of member JeffYoung who started this thread, and post Quasimodo results ONLY. Commentary, inquiries, requests, and general remarks can go to the general Quasimodo thread

Simple, no-math transformer snubber using Quasimodo test-jig
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Old 15th April 2019, 07:36 AM   #25
Hicoco is offline Hicoco  France
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Quasimodo results (ONLY)
AMGIS L01-6364, 2x115V / 2x18v / 25VA,
CX: 0,22uF
CS: 0,68uF

RS: 11 Ohm
fosc ~ 60kHz
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Old 29th April 2019, 01:00 AM   #26
subtropicus is offline subtropicus  Australia
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Vigortronix VTX-146-050-218 50VA 115/230 18+18
Primaries in series (230V)
Cx 10nF
Cs 150nF
Rs 26Ω / 26Ω


Vigortronix VTX-146-050-212 50VA 115/230 12+12
Primaries in series (230V)
Cx 10nF
Cs 150nF
Rs 19.8Ω / 19.5Ω


Jaycar MT2086 20VA 240V 15+15
Cx 10nF
Cs 150nF
Rs 20Ω / 20Ω
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Old 29th April 2019, 01:38 PM   #27
Hicoco is offline Hicoco  France
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Vigortronix VTX-146-300-226 300VA 2x115V \ 2x 25V
Primaries in series (230V)
Cx 10nF
Cs 150nF
Rs 9.2Ω
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Old 29th April 2019, 07:49 PM   #28
mlloyd1 is offline mlloyd1  United States
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Quasimodo results (ONLY)
Oops ...
After all this time, finally remembered to post my results over here.

Using Hammond 229D40 transformers acquired from Mouser
"My" chosen snubber values are:
0.15uF, 0.01uF and 424ohms (I have a BUNCH of 196 ohm and 226 ohm resistors so easily made my "424"ohm resistor, but that much accuracy is not needed )

mlloyd1

Last edited by mlloyd1; 29th April 2019 at 07:52 PM.
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Old 2nd June 2019, 09:27 PM   #29
merlin el mago is offline merlin el mago  Europe
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Audiophonics R-Core 230V primary dual 9V secondary 30VA, measurement with two secondaries in parallel

Cx 10nF
Cs 150nF
Rs 58Ω
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Old 22nd June 2019, 12:36 PM   #30
merlin el mago is offline merlin el mago  Europe
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Audiophonics R-Core 230V primary dual 15V secondary 30VA, measurement with two secondaries in parallel

Cx 10nF
Cs 150nF
Rs 140Ω
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