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Simple, no-math transformer snubber using Quasimodo test-jig
Simple, no-math transformer snubber using Quasimodo test-jig
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Old 12th November 2019, 01:23 PM   #1711
jphabc54 is offline jphabc54  United States
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Thanks for the great project! I have 9 extra boards that I ordered from Seeed. Happy to share with fellow members. $3 shipped in the US will cover production costs and shipping. I will ship overseas, but will need to calculate extra shipping. PM me if interested.

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Old 12th November 2019, 01:51 PM   #1712
Mark Johnson is offline Mark Johnson  United States
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Simple, no-math transformer snubber using Quasimodo test-jig
BTW when I ship PCBs to diyAudio members outside the US, I put them in bubble mailer envelopes and use the Post Office's product called

First-Class Package International Service

This morning I screen-grabbed their price list, and attached it below. Except for our nearest neighbors, Mexico and Canada, shipping costs are more or less identical to the rest of the world. 1 PCB plus envelope and stamps and label and tape will weigh about 2 ounces.

~
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Old 13th November 2019, 07:25 PM   #1713
matjazsket is offline matjazsket
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Smile Thank you Mark!

Hi to all,
I also did it and it works excellent! Thank you Mark!
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File Type: jpg IMG_2930.jpg (106.4 KB, 328 views)
File Type: jpg IMG_2928.jpg (67.2 KB, 328 views)
File Type: jpg IMG_2931.jpg (60.8 KB, 71 views)
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Old 13th November 2019, 08:02 PM   #1714
Mark Johnson is offline Mark Johnson  United States
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Simple, no-math transformer snubber using Quasimodo test-jig
Congratulations, matjazsket! Your damped ringing waveform is beautiful.

You might fool around with the settings of the DIP switches, maybe a different setting would let the ringing completely die away (2nd picture) to flat-line, before launching another stimulus.
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Old 14th November 2019, 08:00 AM   #1715
thompsontechs is offline thompsontechs
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Yup, looking good Mat!
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Old 15th November 2019, 12:46 PM   #1716
sov is offline sov  Sweden
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Simple, no-math transformer snubber using Quasimodo test-jig
Yeah, the bell is ringing. Now every trafo is going to be snubbered.
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File Type: png Toroidy 30VA 230V dual 15-0-15 without pot.png (117.3 KB, 65 views)
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Old 15th November 2019, 02:43 PM   #1717
Mark Johnson is offline Mark Johnson  United States
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Simple, no-math transformer snubber using Quasimodo test-jig
Sov, congratulations on getting your Quasimodo to work. However I think you have dialled the potentiometer a little too much.

Here are the steps towards the goal. Photo #4 is the goal. You want the second lump to disappear (the downward pointing "trough"). Not the first.

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Old 15th November 2019, 05:32 PM   #1718
sov is offline sov  Sweden
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Simple, no-math transformer snubber using Quasimodo test-jig
Thank you Mark for the explanation. Good to know.
The first bump makes a sharpen edge.
Now Iím going to snubber everthing(!)
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Old 2nd December 2019, 01:04 PM   #1719
Mark Johnson is offline Mark Johnson  United States
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Simple, no-math transformer snubber using Quasimodo test-jig
Quote:
Originally Posted by Mark Johnson, in message #1545 (21 April 2019) of this thread View Post

Occasionally I've thought about replacing Cx in a transformer secondary snubber, with a Metal Oxide Varistor. MOVs are overvoltage protection devices, similar to big gigantic bidirectional zener diodes.
Eventually I did. It's in a small, single purpose "PSU for Chipamps" that has none of the options and features and builder-choices which provide universality in the diyAudio Store "Universal Power Supply PCB". So it's a much smaller PCB, allowing a much smaller chassis for a stereo power amp, which uses very small chipamp boards for its two amplifier channels.

The board is discussed in this thread , and the circuit schematic is attached below. Click on the image to see it full size and then click on the "expand me" icon at the lower left corner of the popup image. Component values implement a damping factor not equal to 1.0 ; for this PCB, I chose values that I think are best in this application. Following my own advice, repeated several times on this thread: "If you know what you're doing, set the damping factor to whatever value you like. If you don't know what you're doing, set the damping factor to 1.00."

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Last edited by Mark Johnson; 2nd December 2019 at 01:08 PM.
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Old 5th December 2019, 06:35 AM   #1720
PKO is offline PKO  Netherlands
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Quote:
Originally Posted by jphabc54 View Post
Thanks for the great project! I have 9 extra boards that I ordered from Seeed. Happy to share with fellow members. $3 shipped in the US will cover production costs and shipping. I will ship overseas, but will need to calculate extra shipping. PM me if interested.

Click the image to open in full size.

Click the image to open in full size.
PB sent . Looking forward to build the boards and do some testing (and providing myself with an excellent excuse to finally buy a proper scope for Christmas).
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