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#21 | |
diyAudio Member
Join Date: Jan 2005
Location: Nashville, TN, USA
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Quote:
CFP stands for complementary feedback pair. The shunt reg has two main components(per side). The Constant current source, and the shunt. The shunt in this case is a CFP which is driven by an opamp. The whole thing is in a feedback loop and adjustable for both current and output voltage. A CFP is basically a way to create a high current gain similar to a Darlington Pair. 2-3W per power device could easily be handled with 2" HS. You could even do more than that if you use a larger heat sink. Once you reach a certain point a series reg would be a more sensible choice. Cheers! Russ |
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#22 | |
diyAudio Member
Join Date: Jan 2005
Location: Nashville, TN, USA
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Quote:
It should provide better load regulation and line regulation than a LCBPS. It also has a very low noise voltage reference (2 green LEDSs with 1K/100uf filter) and as long as a low noise high PSRR opamp is used you will achieve excellent results. Cheers! Russ |
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#23 |
diyAudio Member
Join Date: Jan 2005
Location: Nashville, TN, USA
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Hey folks here is the schematic and 100% scale PDF for those planning case space etc.
The cct is not very complicated, but very effective. ![]() Cheers! Russ |
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#24 |
diyAudio Member
Join Date: Jan 2005
Location: Nashville, TN, USA
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For those who are wondering, yes Placid(non-BP) is simply just the positive half the cct.
Cheers! Russ |
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#25 | |
diyAudio Member
Join Date: Nov 2005
Location: Silicon Valley
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Quote:
To confirm that my system/printer did not scale it (I unchecked those options) The board is ~ 3" x 3.5"? I think I can fit that in. I'll leave a little extra room around the LCBPS ![]() |
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#26 | |
diyAudio Member
Join Date: Nov 2005
Location: Silicon Valley
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Quote:
Thanks! |
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#27 |
diyAudio Member
Join Date: Mar 2006
Location: Switzerland
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Hi Russ
Have you thought about separating the grounds of the two circuits? You would need a 4-pin phoenix connector (instead of a 3-pin) at the output. Having the circuits separated from each other would make the supply more universal, as it could also be used as dual supplies. Even if used as a bipolar supply, it may be preferable to join the grounds at the load, not at the source. May help in avoiding ground loops. Kurt |
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#28 |
diyAudio Member
Join Date: Jan 2005
Location: Nashville, TN, USA
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It's Bipolar, meaning they are supposed to share GND. It designed to work as such, both voltage references have to share the same 0V point.
![]() Its a single supply with three voltages V+/0V/V- not two supplies. ![]() Now having said all that, if you like you can use two (non-bipolar) placid in series and achieve what you want. Cheers! Russ Last edited by Russ White; 18th September 2009 at 11:59 PM. |
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#29 |
diyAudio Member
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#30 | |
diyAudio Member
Join Date: Jan 2005
Location: Nashville, TN, USA
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Quote:
![]() The Placid is 2.85" x 2.35". I tried to make it as compact as practical thus the odd size. Cheers! Russ |
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