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Old 15th February 2013, 12:37 AM   #5721
Salas is online now Salas  Greece
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Higher voltage caps usually have better ESR but if you already got other, sure, you will still get by.
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Old 15th February 2013, 08:51 PM   #5722
Dimitris
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I am also building an 8V BiB @500mA to try with my Shigaclone

Click the image to open in full size.

Reference R is 300R + 1K pot aiming for ~1K
Filter and zobel will be electrolytic as per the guide (220 and 47 uF)
The CSS R will be 2R, the main filter cap will be 10000uF and the diodes are MUR860.
Oh and I just noticed that I need to short D302B

Any thoughts taking into consideration the weird load that the ShigaClone will be? Digital+motors....?
Is there any reason to use a 22000uF cap ?
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Old 15th February 2013, 09:11 PM   #5723
Salas is online now Salas  Greece
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Takes seeing it on the scope for how is reacting to the load to say if its OK or needs something else to do.
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Old 15th February 2013, 09:14 PM   #5724
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Yeah it s a nice opportunity to dust my Rigol

About the 22000uF? You see any potential benefit?
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Old 15th February 2013, 09:21 PM   #5725
Salas is online now Salas  Greece
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Gives higher filtering as a main reservoir, but I don't think the Shiga needs that much? On the other hand it could make the diodes stress harder for not much reason if its so.
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Old 15th February 2013, 11:10 PM   #5726
canvas is offline canvas  Taiwan
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I don't have Shigaclone, but I heard it can be powered separately. 5V for digital + 8V for motor.

This photo is not mine. If there is issue, I will remove it.
Click the image to open in full size.

Although Salas's regulator performs excellently, I don't recommend it for CD motor. Too much heat. You can power the digital 5V by Salas's and use a LM317T or LT1085 for motor.

Last edited by canvas; 15th February 2013 at 11:14 PM.
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Old 16th February 2013, 12:03 AM   #5727
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Default Checking reg's stability?

I'm building the reg for the Shigaclone as well.
When checking the reg's stability (e.g. checking for oscillations), it seems a scope is only way to go but (as I don't have one) are there any other tell-tale signs that the reg isn't stable?
I read in this thread that an A.M. radio (if close enough) will pick up major oscillation problems. Are there any other tests or conditions that indicate the reg is unstable? Maybe the output voltage varies a significant amount?

Thanks
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Old 16th February 2013, 12:57 AM   #5728
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canvas the Shigaclone on its current incarnation can take up to 4 separate PSUs and this is something that I would love to check at some point.

About the heat, the psu will be on a separate case so no problem there.
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Old 16th February 2013, 01:23 AM   #5729
canvas is offline canvas  Taiwan
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Quote:
Originally Posted by dimkasta View Post
canvas the Shigaclone on its current incarnation can take up to 4 separate PSUs and this is something that I would love to check at some point.

About the heat, the psu will be on a separate case so no problem there.

To be precise, the laser pickup can be powered separately (5V+8V). Others, of course, can be powered as much as you can. My transporter is based on SONY CXD2500 & CXA1372, and I am planning to to do the same thing. Perhaps 2 PSUs for CXD2500 and another for CXA1372. BTW, I think it's overkill to have Salas's regulator for motor.
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Old 16th February 2013, 09:40 AM   #5730
Salas is online now Salas  Greece
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Quote:
Originally Posted by marcus1 View Post
I'm building the reg for the Shigaclone as well.
When checking the reg's stability (e.g. checking for oscillations), it seems a scope is only way to go but (as I don't have one) are there any other tell-tale signs that the reg isn't stable?
I read in this thread that an A.M. radio (if close enough) will pick up major oscillation problems. Are there any other tests or conditions that indicate the reg is unstable? Maybe the output voltage varies a significant amount?

Thanks
Wide band hum on the signal, suspicious heat, unstable current bias, are usual signs of strong oscillation in general. Mild one it may be more sneaky though.
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