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diyAudio Member

Join Date: Apr 2011
Quote:
 Originally Posted by king4joy 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

diyAudio Chief Moderator

Join Date: Oct 2002
Location: Athens-Greece
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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 10th December 2012, 03:31 PM #2023 diyAudio Member   Join Date: Jun 2006 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
 10th December 2012, 04:34 PM #2024 Dimitris diyAudio Member     Join Date: May 2010 Location: Athens Guys has anyone tried to turn BiBs into a lab PSU with variable Vout and V/A meters?
diyAudio Chief Moderator

Join Date: Oct 2002
Location: Athens-Greece
Quote:
 Originally Posted by samoloko 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.

diyAudio Chief Moderator

Join Date: Oct 2002
Location: Athens-Greece
Quote:
 Originally Posted by dimkasta 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.

 10th December 2012, 05:10 PM #2027 Dimitris diyAudio Member     Join Date: May 2010 Location: Athens 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
 10th December 2012, 06:05 PM #2028 diyAudio Chief Moderator     Join Date: Oct 2002 Location: Athens-Greece 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.
 11th December 2012, 07:31 AM #2029 diyAudio Member   Join Date: Jul 2004 Location: Scottish Borders 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. __________________ regards Andrew T.
diyAudio Member

Join Date: Jun 2006
Quote:
 Originally Posted by Salas 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.
what Is min recommended value for Vref

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