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Old 2nd May 2013, 07:56 AM   #5901
canvas is offline canvas  Taiwan
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Hi Salas,

Do you think 4.7uf X7R ceramic is ideal for 1.2R's zobel & vref bypass?
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Old 2nd May 2013, 09:42 AM   #5902
Salas is online now Salas  Greece
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No.
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Old 2nd May 2013, 10:58 AM   #5903
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Niko I ve been using a BiB for supplying the digital parts of a Shigaclone transport.
Its actual performance is this

Click the image to open in full size.

Any suggestions to make it behave better? I was thinking something like what we tried for odac
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Old 2nd May 2013, 11:11 AM   #5904
AndrewT is offline AndrewT  Scotland
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Is this 8.2mVac of HF noise on the output of your PSU?
It's not random noise. The pp to rms ratio is too low.
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Old 2nd May 2013, 12:53 PM   #5905
Salas is online now Salas  Greece
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Quote:
Originally Posted by dimkasta View Post
Niko I ve been using a BiB for supplying the digital parts of a Shigaclone transport.
Its actual performance is this

Click the image to open in full size.

Any suggestions to make it behave better? I was thinking something like what we tried for odac
That's EMI eat it with a cap.
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Old 2nd May 2013, 01:02 PM   #5906
AndrewT is offline AndrewT  Scotland
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EMI from the Shigaclone?
In which case the filter needs to be at the Shigaclone.
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Old 2nd May 2013, 01:05 PM   #5907
Salas is online now Salas  Greece
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You never know exactly where from if the experimenter won't nail the source. I will show an interesting experiment shortly with a something noise I will try to photograph.
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Old 2nd May 2013, 02:04 PM   #5908
Salas is online now Salas  Greece
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1. Bench power supply set at 12V DC. Hooked to scope on AC coupling. ~26mV pk-pk spiky noise. "What a bad PSU!"
2. Same test config. Only that the PSU is powered OFF. ~29mV pk-pk spiky noise. Ooops!
3. Same config (2), opposite view.
4. Capture of config (1).

*MASTECH HY3005D3 bench PSU. RIGOL DS2000 series scope with 20MHZ bandwidth limit ON (signaled by "B" next to the vertical scale indication).
Attached Images
File Type: jpg 1N.jpg (334.9 KB, 317 views)
File Type: jpg 2N.jpg (329.4 KB, 301 views)
File Type: jpg 3N.jpg (463.4 KB, 295 views)
File Type: png DS2_QuickPrint5.png (55.0 KB, 99 views)
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Old 5th May 2013, 07:12 PM   #5909
pchw is offline pchw  United States
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In this post, Kasuo San had the 2n4403 thermal coupled. Are the coupling between the mirror pairs?

For my learning purpose, can you shed a little explanation of why the values of resitors and caps in the sobel circuit of the reflecor is very different from the BiB? Also, what is the range of the capacitance in the vref?

Thanks!!
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Old 5th May 2013, 08:10 PM   #5910
Salas is online now Salas  Greece
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Its about what has been proposed from the start, i.e. to couple the upper pair. Not he bottom pair.

They are different in analysis, Reflektor is current reaction based, so they get different termination.

2200uF is good so not to be too slow start. But you can add more if its low voltage to reach or you are patient.
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