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Old 2nd August 2011, 08:00 PM   #1
JZatopa is offline JZatopa  United States
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Default Quick F5 PS question

Would it be ok to use 2W .47ohm resistors as opposed to 3w in the power supply?
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Old 2nd August 2011, 08:08 PM   #2
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Best to use 3w or better. They get real hot.
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Old 2nd August 2011, 08:28 PM   #3
JZatopa is offline JZatopa  United States
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OK thanks.
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Old 2nd August 2011, 08:29 PM   #4
juma is offline juma  Serbia
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I * I * R = P
1.2 * 1.2 * 0.47 = 0.6768 W

So, 2W resistors are fine here (except if you have 4 Ohm speaker and you drive the amp to full power for long period of time).
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Old 2nd August 2011, 08:34 PM   #5
JZatopa is offline JZatopa  United States
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Well I may hook the amps up to a 2 ohm speaker load at some point and I would rather be safe then sorry. I just happened to have 2W available. For 3w or bigger I need to make an order.

Does quality of resistor in this area matter much? Will you notice a difference between a sand-cast or something better? I am guessing not.
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Old 2nd August 2011, 08:50 PM   #6
juma is offline juma  Serbia
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I don't like the good things to go to waste. You can put 2 x 0R47 in series and parallel them to another two in series. That's equal to one 0R47/8W resistor.
When it comes to quality, aim for low temp. drift and precision, don't waste the money on boutique parts...
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Old 2nd August 2011, 08:52 PM   #7
JZatopa is offline JZatopa  United States
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I just found a local source of just what I need (no crazy shipping fees). I am going there tomorrow.
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Old 3rd August 2011, 10:39 AM   #8
AndrewT is offline AndrewT  Scotland
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five 2r2, 600mW in parallel give an effective 0r44, 3W
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