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In Reply to: RE: LiFePo4 Battery from 13.2V to 12V (or 11.8V) posted by jackwong96 on November 27, 2011 at 04:47:40
Small cap!? You are right as core audio also suggests so: http://www.coreaudiotechnology.com/blog/?p=24.
Therefore, I should use Oscon. What value (Voltage and Farads) should I use?
Is this one OK: http://www.ebay.com.hk/itm/68Pcs-220uF-63V-korea-cap-Power-supply-board-kit-sc-/200619648046?pt=LH_DefaultDomain_0&hash=item2eb5dce42e#ht_2354wt_901? I can replace all cap with Oscon!!!
Follow Ups:
Oscon is not good enough, I recommend Siemens Sikorel. 100-220uf 16V will do the job, bypassed by 0.1uf MKP cap.I recommend buying from Taobao.com rather than Ebay, cheaper.
The source.
http://search.taobao.com/search?q=sikorel&searcy_type=item&s_from=newHeader&source=store&ssid=s5-e&search=y
Edits: 11/27/11
Thank you, Jack.
I understand that the cap should be connected in parallel. How many pieces do I need?
How should I connect the bypass cap? Should I also connect it in parallel but closest to the load?
Regards
Battery supply is quite pure and has no ripple. Hence big caps are not necessary. They have noise however. The small caps are for absorbing battery noise and enhancing high frequency response. Therefore, quality rather than quantity matters. 100-220uf + 0.1uf will be fine. I used 22uf 63V Sikorel, just happen to have such value and they work fine.
One suggestion is to connect the caps to the bottom of the Mobo, and in this, beneath the P4 12V socket.
See link.
http://www.audioasylum.com/forums/pcaudio/messages/7/75904.html
Thank you, Jack.
I now decide to connect in the following way:
LiFePo4 (13.2V) --> 1.5R, 5W resistor in series (later change to Caddock) --> 220uF 16V cap (later change to Simens SIKOREL125) in parallel --> 0.1uF cap (later change to MCap) in parallel --> CPU (P4)
I try to avoid using any IC in the circuit as far as possible.
I have seen your mod on the mobo. Wow, great great work!!! I also wish to have my mobo mod like yours!!! I now use gigabyte 890GPA-UDH3 which is a AMD system as AMD has a lower SMI latency value.
Thank you for the advice again.
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