What caps are these????

freakyone · 29th October 2005, 10:01 PM

Im in the process of purchasing 8 s/h caps, 4 for each channel

Does anyone know just what im about to buy?......

eg manufacture date:confused:

these are the specs

pwm2a1v04
100 000 uF
35WV 44SV
+85oC
OG10A-T

CLC design, L being 1.8mh

Cheers!
Dan

freakyone · 30th October 2005, 08:07 AM

Hello again!

I forgot to add that this will be the PSU for my aleph-x (my first go at diy), when looking at caps this large do I need to look at adding a soft start????????????

Cheers

sss · 30th October 2005, 11:54 AM

for 100000uf a soft start is a good idea

jacco vermeulen · 30th October 2005, 01:22 PM

Quote:

Originally posted by freakyone
manufacture date

manufacture date:
pwm = production week of manufacture.
2d week,2001.
35WV = operating voltage
44SV= surge voltage (= maximum peak voltage)

MikeB · 30th October 2005, 01:59 PM

Quote:

Originally posted by freakyone
L being 1.8mh

Is that a typo ?

Mike

Eva · 30th October 2005, 02:43 PM

Those 1.8 mH inductors must have at least 0.17 ohms resistance, otherwise the resulting LC system will resonate like crazy at 10Hz, and when excited with the proper audio signal this will probably result in overvoltage to the capacitors and the amplifier.

Inductor saturation current must be also taken into account, since they will stop filtering after this current level is reached. CLC filters are probably not well suited for beginners.

freakyone · 30th October 2005, 06:08 PM

Thanks for reply guys!

I am thinking of purchasing some 14 AWG and winding four chokes using Barry's Inductor Simulation as guidence, which should give me a DCR of about .4ohms, If I was to cut four lenghts the same at 40m and wind these up I cannot imagine this being to difficult and the Inductance should be the same.

With this DCR and the alephx being constant current shouldnt this cause very low resonance?

Cheers

Dan

Eva · 30th October 2005, 06:18 PM

Don't worry, with 0.4ohms DCR the resulting filter will be very well damped.

Tweeker · 30th October 2005, 06:30 PM

This calculator will give you inductors approximating "perfect lay" designs.

When choosing your magnet wire to wind inductors be sure to keep Amps squared * Resistance = watts dissipated in mind, they are going to get hot.

With 7.5 amps bias and .4 ohms DCR in an AX 100 you'd be looking at ~30 watts dissipated in each inductor.

jacco vermeulen · 30th October 2005, 07:45 PM

in case you haven't found the link to Duncan's critter for fiddling CRC's yet:

http://www.duncanamps.com/psud2/index.html

29th October 2005, 10:01 PM	#1
freakyone diyAudio Member Join Date: Sep 2005	What caps are these???? Im in the process of purchasing 8 s/h caps, 4 for each channel Does anyone know just what im about to buy?...... eg manufacture date:confused: these are the specs pwm2a1v04 100 000 uF 35WV 44SV +85oC OG10A-T CLC design, L being 1.8mh Cheers! Dan

30th October 2005, 11:54 AM	#3
sss diyAudio Member Join Date: Jul 2003 Location: Israel , haifa	for 100000uf a soft start is a good idea __________________ if you are not living on the edge you are taking too much space

30th October 2005, 07:45 PM	#10
jacco vermeulen diyAudio Member Join Date: Oct 2004 Location: At the sea front, Rotterdam or Curaçao	in case you haven't found the link to Duncan's critter for fiddling CRC's yet: http://www.duncanamps.com/psud2/index.html __________________ Not so much,.......if it says "ZM" in the corner.

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30th October 2005, 08:07 AM	#2
freakyone diyAudio Member Join Date: Sep 2005	Hello again! I forgot to add that this will be the PSU for my aleph-x (my first go at diy), when looking at caps this large do I need to look at adding a soft start???????????? Cheers

30th October 2005, 02:43 PM	#6
Eva diyAudio Member Join Date: Oct 2003 Location: Near the sea	Those 1.8 mH inductors must have at least 0.17 ohms resistance, otherwise the resulting LC system will resonate like crazy at 10Hz, and when excited with the proper audio signal this will probably result in overvoltage to the capacitors and the amplifier. Inductor saturation current must be also taken into account, since they will stop filtering after this current level is reached. CLC filters are probably not well suited for beginners.

30th October 2005, 06:08 PM	#7
freakyone diyAudio Member Join Date: Sep 2005	Thanks for reply guys! I am thinking of purchasing some 14 AWG and winding four chokes using Barry's Inductor Simulation as guidence, which should give me a DCR of about .4ohms, If I was to cut four lenghts the same at 40m and wind these up I cannot imagine this being to difficult and the Inductance should be the same. With this DCR and the alephx being constant current shouldnt this cause very low resonance? Cheers Dan

30th October 2005, 06:18 PM	#8
Eva diyAudio Member Join Date: Oct 2003 Location: Near the sea	Don't worry, with 0.4ohms DCR the resulting filter will be very well damped.

30th October 2005, 06:30 PM	#9
Tweeker diyAudio Member Join Date: Dec 2004 Location: Cincinnati, Ohio	This calculator will give you inductors approximating "perfect lay" designs. When choosing your magnet wire to wind inductors be sure to keep Amps squared * Resistance = watts dissipated in mind, they are going to get hot. With 7.5 amps bias and .4 ohms DCR in an AX 100 you'd be looking at ~30 watts dissipated in each inductor.

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