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Old Yesterday, 05:56 PM
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maxhifi maxhifi is offline
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Wirewound Resistor Lesson

I posted another thread about counterfeit STK modules. Anyway the bad ones I got blew two 1.8 ohm 2W resistors on the convergence board of my Runco/NEC projector. I got the new modules, and I changed the resistors to 5W wirewound ceramic resistors, and suddenly all week, the projector would randomly become unstable, text would twitch and vibrate periodically, and then snap back to normal. Subtle but really annoying if you knew to look for it.

I thought OK it never did this before, what's different? Well, 2W metal film resistors fixed it.. it's totally stable now. Learn something every day, I guess!

Must have been the inductnce of the wirewound resistors messing things up.
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Old Yesterday, 11:28 PM
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MadMan MadMan is offline
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Originally Posted by maxhifi View Post
Must have been the inductnce of the wirewound resistors messing things up.
Intermittently, though? That's odd, if it was the inductance, wouldn't it be 100% of the time? Maybe they were defective or something. Internal short?
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Old Today, 08:59 AM
zeno zeno is offline
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Location: New Hampshire
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I would guess so. You cant use WW resistors to sub in
many places especially high freqs. Also those resistors are
being used for fuses for the STK's. Going to 5W risks
damage to usually the FBT if ( when) the STK shorts again.
The only time to use them is in a quick test or a smoke test.

73 Zeno
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