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Old 17th October 2017, 02:59 AM   #11
KevinHeem is offline KevinHeem  United States
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Quasimodo results (ONLY)
This chart shows my results testing an Antek AS-4218 with Cx=10nf Cs=150nf and Rs=6-10Ω. I'm using 7Ω in my actual circuit.

10to6ohm.pdf
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Old 19th October 2017, 12:46 PM   #12
dimkasta is offline dimkasta  Greece
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A mention of the primary configuration might also be useful. From what I remember from Mark's article, the optimal point differs a bit if the primary is wired in series (230VAC) or in parallel (110VAC)
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Old 26th January 2019, 07:45 PM   #13
andrensairr is offline andrensairr  Australia
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Harbuch Electronics I2225FAM (500VA, 240V primary, dual 45V secondaries)


Cx 10nF
Cs 150nF
Rs 19.8Ω
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Old 29th January 2019, 04:29 PM   #14
merlin el mago is offline merlin el mago  Europe
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Selectronic R-Core (120VA, 240V primary, dual 18V secondaries)

Cx 10nF
Cs 150nF
Rs 110Ω
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Old 2nd February 2019, 01:17 PM   #15
Johnny Canuck is offline Johnny Canuck  Canada
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Primrose Audio Toroids (two) (508VA, dual 120V primaries, dual 18V secondaries)

Cx 10nF
Cs 150nF
Rs 10Ω
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Old 9th February 2019, 06:08 PM   #16
SyncTronX is offline SyncTronX  United States
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Antek AS-4218, 400VA, dual 18V secondaries, dual full wave bridges:
(Attributed to another DIYer who requested to not use his name.)



Cx = 3.3nf
Cs = 470nf
Rs = 16.9 ohms
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Old 9th February 2019, 06:38 PM   #17
Mark Johnson is offline Mark Johnson  United States
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Posted 08 December 2018 HERE

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Quasimodo results (ONLY)-jsjsjsjsjsj-png
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Old 8th April 2019, 11:00 AM   #18
audiomusica is offline audiomusica  Germany
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Talema 2x115V, 2x7V, 2x12,5VA


Primaries in series for 230V operation and shorted (for snubbing)
Secondaries in parallel


Cs=150nF, Cx=10nF -> fosc ~ 625kHz(!)



Snubbing this small print torodial transformer I get values for Rs ~ 12Ohm.


Are such low values for Rs reasonable?
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Old 8th April 2019, 11:45 AM   #19
kamis is offline kamis  Serbia
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Results with Cheapo Modo , ANG low profile 2x30V, 24VA, fosc 10.5KHz .
Very high 24mH inductance. Standard C values, RS 770 Ohm.
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Old 8th April 2019, 01:07 PM   #20
Mark Johnson is offline Mark Johnson  United States
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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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