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Old 30th November 2011, 05:15 AM   #161
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Default CT transformer

Did someone try a CT transformer (like 15-0-15) with the HD BP placid instead of dual secondaries? I have a good Hammond CT but I'm not sure if the Placid needs a mod...
Thanks.
Pierre
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Old 30th November 2011, 11:35 AM   #162
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Yes the Placid would need some changes. The easiest thing to do would be to use an external rectifier and connect the CT to GND.

Better yet, just use a dual secondary transformer.
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Old 20th December 2011, 03:49 AM   #163
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Default shunt current

If my Placid HD BP is wired to a Legato 3.1, what shoud be the shunt current?
Thanks.
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Old 20th December 2011, 10:41 AM   #164
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Shunting from 160mA should give a good starting point to get 12V.
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Old 20th December 2011, 11:36 AM   #165
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Quote:
Originally Posted by crazyfrog View Post
If my Placid HD BP is wired to a Legato 3.1, what shoud be the shunt current?
Thanks.
You want about 50-60ma shunt current.
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Old 20th December 2011, 04:12 PM   #166
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Question questions on BOM for Placid (HD v.1.0)

Hello:

I work through BOM for Placid (HD v1.0) and would appreciate input on the following:
- How critical is 5ma from D1? Can I use 5.6ma diodes I have in stock?
- The value for R12 is 2K, but the part listedin BOM is 271-1K-RC, which is the same as used for R5 & R6. Is 271-2K-RC the correct part or should 1K resistor be used?
- The value for C2 & C3 is 220nf, but the part is the same as for C4, i.e. 100nf. Is 505-MKP20.22/100/5 the correct part?
- C4 is listed as 100nf in BOM, and as 220nf on the schematic. Which one is correct?
- BC550B/BC560B appears to be obsolete. Can I use BC550C/BC560C instead?
- The value for VR1, VR2 is listed 20K, but the listed part T93YA103KT20 is 10K. Which value is correct?

/Dmitry

Last edited by dsolodov; 20th December 2011 at 04:41 PM. Reason: Added C4 note
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Old 2nd January 2012, 02:33 PM   #167
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Default Placid usage for 85 volts dc?

Hi,

Can anyone tell me if I can use this PS for regulating+/- 85 volts DC?

What changes apart from the obvious caps voltage would be required, if any?

Thanks and regards,

Wishes of a happy 2012 to everyone.
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Old 4th January 2012, 11:46 AM   #168
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Quote:
Originally Posted by rclourenco View Post
Hi,

Can anyone tell me if I can use this PS for regulating+/- 85 volts DC?

What changes apart from the obvious caps voltage would be required, if any?

Thanks and regards,

Wishes of a happy 2012 to everyone.
Simply put, Its not designed for that. You could probably make it work, but if you did you would be on your own.
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Old 4th January 2012, 11:50 AM   #169
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Quote:
Originally Posted by dsolodov View Post
Hello:

I work through BOM for Placid (HD v1.0) and would appreciate input on the following:
- How critical is 5ma from D1? Can I use 5.6ma diodes I have in stock?
- The value for R12 is 2K, but the part listedin BOM is 271-1K-RC, which is the same as used for R5 & R6. Is 271-2K-RC the correct part or should 1K resistor be used?
- The value for C2 & C3 is 220nf, but the part is the same as for C4, i.e. 100nf. Is 505-MKP20.22/100/5 the correct part?
- C4 is listed as 100nf in BOM, and as 220nf on the schematic. Which one is correct?
- BC550B/BC560B appears to be obsolete. Can I use BC550C/BC560C instead?
- The value for VR1, VR2 is listed 20K, but the listed part T93YA103KT20 is 10K. Which value is correct?

/Dmitry
Follow the schematic and you will be golden.

The values of C2 C3 and C4 are interchangable. Either value is fine.

BC550B is not obsolete. But Yes the "C" variation is just fine.

The current from D1 is not overly critical 4-6ma should be just fine.
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Old 13th January 2012, 12:27 PM   #170
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Default placid hd bp tune

I have a few questions on the above subject.

1) Placid HD-BP for the IVY 3.
In the manual, it is stated that 12-15Vdc supply for the IVY3, which means a total of 24-30Vdc or a combined total of 12-15Vdc? If its a combined (-&+ total of 15Vdc), then each half is only 6-7.5Vdc, is this right? Or is it a combined total of 24-30Vdc (-&+ total of 24-30Vdc, each side i.e. - & Gnd = 15vdc and + & Gdn = 15vdc)?

2) Placid for B3.
The placid output for the B3 is 5.25V. When I connect it to the B3 (the B3 is not connected to anything), the output drops drastically to around 1.95V and the tridents doesn't light up. Is there a problem here?

3) Side Car
In which direction should I solder on the relays (S1, S2 & S3)?

In the B3 manual stated this:

"The standard board requires an input voltage of 5.25V and it draws approximately 440mA when one is
using the recommended set of Trident shunt regulators. We recommend using either a Placid HD tuned
for shunting about 50mA (approx. 490mA CCS current) or half of a LCDPS. See the Placid HD manual for
more detail."

In the IVY3 manual stated this:

"The power supplies should be 12VDC to 15VDC (15V rails will provide the best dynamic range). Each section of the IVY can be powered independently, or a single supply can be used by installing jumpers J1-4, which is the recommended configuration. With 15V rails, the idle current draw will be about 90mA per rail. A suitable power supply should have capacity for at least 150mA per rail"

In the Placid Manual stated this :

"To measure CCS current measure the voltage between TP-VIN and TP-CCS. The measure voltage is the same as the current sourced, example 250mV means 250mA is being sourced."

4) Now, should I tune the CCS voltage between TP-VIN and TP-CCS (between R1) for 50mV or 490mV(0.49V) for the B3?

5) Should I tune the CCS voltage to 90mV or 150mV for the IVY3?
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