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Old 10th September 2005, 07:35 PM   #1
kinser is offline kinser  Israel
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Default Opa541 - Bpa-200

Hi all,

I have just started my OPA541 based BPA-200 and i wanted to know if I could use 0.33 Ohm resistors insted of 0.1 Ohm resistors for the 2 parallel amps ? main reason is because i cant find 0.1 Ohm resistors near by me and second reason is because i have a load of 0.33 Ohm resistors!

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Kinser
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Old 10th September 2005, 08:49 PM   #2
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As far as I know 0.33 resistors will be just fine, and a bit more safe as the peak current will be slightly less, which means safer operation.

So unless someone else knows otherwise I would say go for it.
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Old 10th September 2005, 09:50 PM   #3
mateo88 is offline mateo88  United States
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Why don't you parallel two or three of the .33 ohm resistors?
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Old 11th September 2005, 11:11 AM   #4
kinser is offline kinser  Israel
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Hi again,
Thanks for you relpys.. i think im going to do mateo88 said: Im gonna parallel two 0.33 Ohm resistors to make about 1.65 Ohms!

I do have 2 more Q's:

1. How do i parallel 2 amps? just add the resistors to the output of each amp and connect the same input the amps? (Like this http://mars.walagata.com/w/matttcattt/audio/Fig2.GIF exept in NI mode?)

2. can i use this http://sound.westhost.com/project14.htm circuit for the bridging part?

Thanks,
Kinser
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Old 11th September 2005, 07:39 PM   #5
kinser is offline kinser  Israel
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Anyone out there?






Kinser
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Old 11th September 2005, 08:43 PM   #6
mateo88 is offline mateo88  United States
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1. Yes, that is all you do to parallel them.

2. You most definetly can use that bridging adapter. You may want to have a look at this also.

Good luck with your !
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