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Old 25th March 2003, 06:18 PM   #1
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Default Choosing R in CRC

I'm finishing up my ZV4. I had originally intended to use a CLC filter on the PSU, but I have no room to spare for a big coil. I do have room for a power resistor tho. How does one choose R for a CRC. In my case I have 2x10,000uF followed by a resistor followed by 2 x 10,000uF.

Thanks for your help.

Mike
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Old 25th March 2003, 06:46 PM   #2
joensd is offline joensd  Germany
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Quote:
I'm finishing up my ZV4. I had originally intended to use a CLC filter on the PSU, but I have no room to spare for a big coil. I do have room for a power resistor tho. How does one choose R for a CRC. In my case I have 2x10,000uF followed by a resistor followed by 2 x 10,000uF.
Does a CRC-filter in the ZenV4 with its regulator make sense anyway?

Jens
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Old 25th March 2003, 06:48 PM   #3
uli is offline uli  Austria
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Default value

Hi Mrothacher,
I would take as big as you can stand it.(1R or so)
(I mean the voltage drop across that resistor.)

Uli
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Old 25th March 2003, 07:05 PM   #4
HDTVman is offline HDTVman  United States
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Default Re: Choosing R in CRC

Quote:
Originally posted by mrothacher
I'm finishing up my ZV4. I had originally intended to use a CLC filter on the PSU, but I have no room to spare for a big coil. I do have room for a power resistor tho. How does one choose R for a CRC. In my case I have 2x10,000uF followed by a resistor followed by 2 x 10,000uF.
If you built the ZV4 with the regulated power supply, CRC is just a waste of power as heat for a very questionable gain in performance. Don't get me wrong it most likley will not hurt anything, it just isn't going to help much. A CLC on the other hand will give the regulator more headroom to work with because of the ripple reduction on the second Cap and improve AC line noise rejection. I don't think you will need it though.

Just my 2 cents

Later
Bruce


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Old 25th March 2003, 08:06 PM   #5
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Thanks.

Your replies are most appreciated!

Since we're on the topic, If a coil suffers loss of inductance at higher current (saturation?) Will the filter simple behave as CRC. With the value of R simply being the DC resistance of the coil?

I believe you may be right - its probably overkill anyway.

Mike
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Old 25th March 2003, 08:06 PM   #6
Yonnat is offline Yonnat  France
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HI,

I can only tell you what I made on my PS, this for the Aleph30. I have first 2x20.000MF, than 0,33R on each rail and after 2X20.000MF + 4X10.000MF, what are the results: on the first caps the ripple is about 0,6V, at the output of the supply I found only 0,03V ripple, the current is 2A for each channel.

Hope that this can help you.

Regards.
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