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Old 21st March 2013, 10:40 PM   #19121
UV101 is offline UV101  England
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And it'll be even better if you regulate the new rails


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This was using +/-8v from the original transformer, but you can use +/-12v regs if you are using a separate transformer and power supply.
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Old 21st March 2013, 11:53 PM   #19122
dwjames is offline dwjames  England
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Quote:
Originally Posted by UV101 View Post

This was using +/-8v from the original transformer, but you can use +/-12v regs if you are using a separate transformer and power supply.
I've seen mention of +/-8v, +/-9v & +/-12v regs used for these. Are the servo driver ICs not bothered about the voltage as long as it's stable?

Last edited by dwjames; 22nd March 2013 at 12:07 AM.
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Old 22nd March 2013, 08:10 AM   #19123
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No, they can handle upto +/-20V supply voltage, so that's not a problem. But I don't think you'll gain anything from a higher supply, the motor needs only about 4V. The 7812/7912 regulators are more common though, not all suppliers carry the 8V or 9V version.

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Old 22nd March 2013, 08:27 AM   #19124
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Thanks Ray, I've got some 9v regs on the way.
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Old 22nd March 2013, 06:12 PM   #19125
UV101 is offline UV101  England
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Is it a KI version? The reason I used 8v is because with the std transformer, there wasn't enough drop out for 9v regs
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Old 22nd March 2013, 06:36 PM   #19126
dwjames is offline dwjames  England
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No, it's a standard normal low spec one.
If my 12v rails are almost completely unused as I have a valve output stage, would it be worth using that to feed these 6 x 9v regs instead?
Or is that no comparison to a separate 50va toroidal tx?
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Old 23rd March 2013, 03:38 AM   #19127
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Old 23rd March 2013, 08:23 AM   #19128
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Quote:
Originally Posted by Ben Hanke View Post
It'll be no comparison. Go big or go home
Lol
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Old 24th March 2013, 08:27 AM   #19129
dwjames is offline dwjames  England
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Cheers guys. I'll just get some 8v regs for now if they work better with the standard transformer

Also, I'm trying to work out which ceramics and resistors need removing if I'm putting some good quality electrolytics for the local decoupling caps like rubycon ZLG 220uF to the servo driver ICs. Has anyone got info or a diagram for that?
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Old 24th March 2013, 05:01 PM   #19130
dwjames is offline dwjames  England
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Actually, I've had a good study of the schematics and I've got it all now, other than the 2 ceramics c146 and c148 being a bit too close together to swap for the ZLG caps and c144 being kind of in the way, but I guess it's nothing a bit leg bending and maybe swapping c144 to the bottom of the board won't sort out. Is that the usual method?
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