F5 C source resistors on the MOSFETs - diyAudio
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Old 16th September 2014, 10:40 PM   #1
potepuh is offline potepuh  Slovenia
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Default F5 C source resistors on the MOSFETs

Hi guys

I need some help, why source resistors on the MOSFETs fukushima 0,47ohm are gone in my F5C after 2 months in one chanel?

I am running the amp at 32VDC. all other parts are ok. Any idea, do I need to increase power of source resistors or their value?
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Old Yesterday, 03:02 AM   #2
eyoung is offline eyoung  United States
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Location: Sunny SC,USA 15 min south of Charlotte NC
One BOM specifies 3W wire wound non-inductive if you are using the "TO220" resistor the may need a heatsink to handle the heat if high biased... do you have a voltage drop across the resistor?

regards, Elwood
"Lead me not into temptation...I can find it myself."
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Old Yesterday, 04:39 AM   #3
sangram is offline sangram  India
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I wouldn't use eBay resistors on an F5. Get something proper. Caddock, Mills and even Ohmite are better bets. In very desperate situation you could use two or three metal film resistors in parallel.
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