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Michi124
diyAudio Member

Join Date: Dec 2003
Location: Berlin, Germany
Quote:
 Originally Posted by audiomusica Are such low values for Rs reasonable?
Yes, definitely. See post #5 by EUVL.
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audiomusica
diyAudio Member

Join Date: Apr 2014
Location: Hanover
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 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 findR < 12.7 ohmsWhich seems to be in broad agreement with your experimental results. You were wrong to doubt them.

 12th April 2019, 05:14 PM #23 Hicoco   diyAudio Member   Join Date: Feb 2018 Location: Provence 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
 13th April 2019, 07:07 PM #24 Mark Johnson   diyAudio Member     Join Date: May 2011 Location: Silicon Valley 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
 15th April 2019, 07:36 AM #25 Hicoco   diyAudio Member   Join Date: Feb 2018 Location: Provence AMGIS L01-6364, 2x115V / 2x18v / 25VA, CX: 0,22uF CS: 0,68uF RS: 11 Ohm fosc ~ 60kHz
 29th April 2019, 01:00 AM #26 subtropicus   diyAudio Member     Join Date: Feb 2019 Location: Sydney 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
 29th April 2019, 01:38 PM #27 Hicoco   diyAudio Member   Join Date: Feb 2018 Location: Provence Vigortronix VTX-146-300-226 300VA 2x115V \ 2x 25V Primaries in series (230V) Cx 10nF Cs 150nF Rs 9.2Ω
 29th April 2019, 07:49 PM #28 mlloyd1   diyAudio Member     Join Date: Feb 2001 Location: Northern Iliinois 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.
 2nd June 2019, 09:27 PM #29 merlin el mago   diyAudio Member     Join Date: Sep 2009 Location: Catalonia - Europe Union Audiophonics R-Core 230V primary dual 9V secondary 30VA, measurement with two secondaries in parallel Cx 10nF Cs 150nF Rs 58Ω
 22nd June 2019, 12:36 PM #30 merlin el mago   diyAudio Member     Join Date: Sep 2009 Location: Catalonia - Europe Union 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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