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Old 7th December 2012, 01:52 PM   #2021
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Quote:
Originally Posted by king4joy View Post
Pre-filter calculatorrsion 1a 01/15/12
DC Feed Parameters VAC In (Tx) 12 Vac RMS AC Peak 17.0 V
Target Current 17000 mA
Rectifier Drop 1 V DC Rectified 16.0 V
Tx DC Resistance 0.9 Ohm R Tx drop 15.3 V
L Filter DC Resistance 0 Ohm L Filter drop 0 V
R Filter 0 Ohm R filter drop 0 V
P(R filter) #DIV/0! W
V DC Out 2 Vdc
Salas....I know now the mistake I have made....it should be 1700mA...not 17000mA...

Now I get VDC out = 11V with 9V AC and 15V DC out with 12V AC input...

So I guess I shoudl use 12V AC transformers.

Cheers,

King
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Old 7th December 2012, 02:13 PM   #2022
Salas is offline Salas  Greece
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You need to be careful with your dissipation on the CCS MOSFET IRF9530 when handling 1.7A. The power dissipated on it is going to be its voltage across, which is VDCin-VDCout, times 1.7A. Use 3 LEDs and some available value around the 0.6R 5W mark for Rset. Use 1C/W sink or better. Verify your real current by measuring voltage across Rset and dividing by its value. There are tolerances beyond the indicative chart.
~7V VDCin-VDCout is a conservative value between enough RegDrop voltage and non needed dissipation. Use just 1 red LED & 2K trimmer, in "see text" area.
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Old 10th December 2012, 03:31 PM   #2023
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Default values of Vout and Vref filter caps

It Is not stated In guide If values higher than 4.7 - 10 uF are better when using films
If I have one 4.7uF and one 10 uF which Is the right place to use
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Old 10th December 2012, 04:34 PM   #2024
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Guys has anyone tried to turn BiBs into a lab PSU with variable Vout and V/A meters?
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Old 10th December 2012, 04:38 PM   #2025
Salas is offline Salas  Greece
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Quote:
Originally Posted by samoloko View Post
It Is not stated In guide If values higher than 4.7 - 10 uF are better when using films
If I have one 4.7uF and one 10 uF which Is the right place to use
No better, bigger than 10u makes it non usefully slower. Use 10u at Vref and 4.7u in Zobel if for not very noise sensitive app.
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Old 10th December 2012, 04:45 PM   #2026
Salas is offline Salas  Greece
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Originally Posted by dimkasta View Post
Guys has anyone tried to turn BiBs into a lab PSU with variable Vout and V/A meters?
You need variable constant current limit and thermally/short protected low dissipation series scheme for lab psu. Slow open loop all scenarios stable. A thermal hog 7MHz shunt is no practical candidate. Get one like this.

Click the image to open in full size.
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Old 10th December 2012, 05:10 PM   #2027
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I was planing to build a BiB to have as a test PSU to check quickly if the design fits my projects before I go for a from the ground build each time.
What I was thinking is that this same build could serve double duty as a general purpose psu
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Old 10th December 2012, 06:05 PM   #2028
Salas is offline Salas  Greece
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If you mean having some quality there for sonic pre-tests too, maybe for a planned top CCS limit apps range and carefully. After protos are tested electrically. But for general bench supply, checking test circuits for working electrically, biasing correctly etc. get an $100 3A automated Chinese one. Those have the utilities that speed up setting, protect, save configs in memories, carry panel meters, and turn your ears to biscuits when the fan revs up.
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Old 11th December 2012, 07:31 AM   #2029
AndrewT is offline AndrewT  Scotland
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Various second hand Lab Type supplies come up on Ebay and similar.

They are quite robust and usually have a long life.
One or two channels and sometimes three channels of output.
Variable voltage and variable current limit with volt and ampere meters are really useful. Some would say mandatory.
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regards Andrew T.
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Old 12th December 2012, 11:23 AM   #2030
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Quote:
Originally Posted by Salas View Post
No better, bigger than 10u makes it non usefully slower. Use 10u at Vref and 4.7u in Zobel if for not very noise sensitive app.
thank you for reply
what Is min recommended value for Vref
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