Good morning!
Although Quasimodo really is "as simple as that" and a joy to use and find that lumpity bumpity moment (THANK YOU MARK!), as I am starting this little expedition, I have some issues and question-marks (pun is fine 🙂 )...
My first steps are indeed promising, with results looking like good, but not yet spot on, just close to.
first image = 18V 50VA tranny
second + third = toroidy 16V 30VA, secondaries connected / unconnected
fourth = connection scheme (an ugly sketch, apologies for that)
fifth: bump
Now, something itches me with the toroidy 16V30VA: While I can reduce the ringing, there seems to be a "sticky point" in the curve, that makes it look a bit bumpy.
My guess is that it's something with the 1:15 Cx - Cx ratio, but... what values should I aim for? Increase Cs? By how much?
I ask because I'd prefer not to waste by buying nonsensical parts...
Although Quasimodo really is "as simple as that" and a joy to use and find that lumpity bumpity moment (THANK YOU MARK!), as I am starting this little expedition, I have some issues and question-marks (pun is fine 🙂 )...
My first steps are indeed promising, with results looking like good, but not yet spot on, just close to.
first image = 18V 50VA tranny
second + third = toroidy 16V 30VA, secondaries connected / unconnected
fourth = connection scheme (an ugly sketch, apologies for that)
fifth: bump
Now, something itches me with the toroidy 16V30VA: While I can reduce the ringing, there seems to be a "sticky point" in the curve, that makes it look a bit bumpy.
My guess is that it's something with the 1:15 Cx - Cx ratio, but... what values should I aim for? Increase Cs? By how much?
I ask because I'd prefer not to waste by buying nonsensical parts...
Attachments
Last edited:
It looks to me that you are solving the problem that doesn’t exist. Bump on the last picture is just like the max. damped response (red trace).
https://www.diyaudio.com/forums/attachments/power-supplies/373151d1380149640-simple-math-transformer-snubber-using-quasimodo-test-jig-avel_usa-png
In my case, Toroidy 60 VA 2 x 18 V transformer required 16 – 22 Ω for optimal damping with standard Cs & Cx values. For the 30 VA transformer I would expect Rx as 22 -27 Ω.
https://www.diyaudio.com/forums/attachments/power-supplies/373151d1380149640-simple-math-transformer-snubber-using-quasimodo-test-jig-avel_usa-png
In my case, Toroidy 60 VA 2 x 18 V transformer required 16 – 22 Ω for optimal damping with standard Cs & Cx values. For the 30 VA transformer I would expect Rx as 22 -27 Ω.