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15th February 2004, 08:52 PM
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#1 |
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diyAudio Member
Join Date: Feb 2003
Location: Bristol
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Bridge and Parrallel Output Resistors.
When bridging and paralleling four or more chips (OPA541 in this case), resistors are required to connect the outputs of the chips (see image).
I am building an amp using bridging and paralleling, and I hope it to produce 150W+ into 8ohms. On the circuit diagram I am following, 10W resistors are specified. All of the output power from the chips goes through these resistors, so in theory, I need ~40W resistors, or I will have to limit my output power to 40W.  Has anyone else thought along these lines, or am I being stupid, and I have nothing to worry about?
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If it aint broke, don't fix it. If it is broke, fix it. If you can't fix it, take it apart and see how it "worked". |
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15th February 2004, 09:50 PM
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#2 |
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diyAudio Member
Join Date: Feb 2003
Location: Bristol
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oops, forgot the image.
__________________
If it aint broke, don't fix it. If it is broke, fix it. If you can't fix it, take it apart and see how it "worked". |
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15th February 2004, 09:51 PM
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#3 |
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Electrons are yellow and more is better!
diyAudio Member
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1 How much current will flow through the resistors at full output load?
2 Which value did you have in mind for these resistors? EDIT: 100 mohms. 3 How much power will each resistor develop? Something to think about.
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/Per-Anders (my first name) or P-A as my friends call me |
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15th February 2004, 10:35 PM
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#4 | |
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diyAudio Member
Join Date: Oct 2003
Location: Toronto
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Re: Bridge and Parrallel Output Resistors.
Quote:
You'll get a rough idea as a percent of the load power. If your load is 8 ohms and you use 2x0.1ohm/leag res. than your power dissipation is 8/0.1=80 times less than the load, so for 100W/80=1.3W over a 0.1ohm resistor. I think 0.1ohm/2W res will do fine for 100W/8ohm load. |
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15th February 2004, 11:35 PM
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#5 | |
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diyAudio Member
Join Date: Feb 2003
Location: Bristol
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Re: Re: Bridge and Parrallel Output Resistors.
Quote:
im just being stupid 
__________________
If it aint broke, don't fix it. If it is broke, fix it. If you can't fix it, take it apart and see how it "worked". |
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