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  1. S

    What is this component

    My 2-cents worth. The symptom you describe sounds to me like a semiconductor failing (overheating). What you're probably noticing is that resistor overheating due to excessive current through it, due to a failing semiconductor elsewhere in the circuit. Typically the semiconductor works fine...
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    Buzzing in viewsonic VA2407h LED monitor

    As long as you open it up to look around, listen to identify WHERE the buzzing is coming from. I wouldn't leap to the conclusion that it's a cap, although a cap might be causing the buzzing somewhere else.
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    Diagnosing my Rouku TCL 49S403 streaming TV

    Do you have the owner's manual? I'd be checking their troubleshooting section before I got into the weeds with this. A lot of these flatscreens, you have to make sure all of the inputs that the TV is supposed to see are turned-on. Most of the problems I've seen, especially if you reset the TV...
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    Ultrasonic pest control

    About 40 (or more) years ago I looked into these ultrasonic pest devices when I lived in a roach infested apartment building. My experience was, it took me a long time to find a piezo speaker that actually output the frequency I built my circuit to produce, because manufacturers falsely claimed...
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    Wiring for a Voltage Selector Switch

    I'm thinking along the line of Bluejets. There are some fuses that actually have a resistor inside the glass fuse. I would guess someone previously replaced the fuse and may have seen or had a resistor inside the fuse assembly, and was experimenting with attempting to add a resistor to the fuse...
  6. S

    source of replacement potentiometer

    How's about looking at the characters written on the pot itself, maybe a manufacturer name or logo. Odds are, it'll help narrow-down the search for an exact replacement.
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    Adding a trim pot to a fan motor

    Also, the small pot you showed in your picture typically is designed for .5W As noted by Bluejets, we don't know how your pellet stove blower and humidifier circuits are designed. Whenever I try something like this, I always plan for a worse-case situation, because I don't want to do the same...
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    Adding a trim pot to a fan motor

    Your pot is not going to last long in your application, as noted by Alec_t. I kind of like PETERDECO's idea of looking for a commercial speed controller. It sounds like you have basic electrical skills. Things like box fans usually have low-medium-high, they do that by putting resistors between...
  9. S

    And now something weird

    Must be a good show on the BBC every morning at 7am in Wales. Either that, or the perpetrating TV owner didn't want anybody else in the village watching that BBC show that comes on at 7am
  10. S

    And now something weird

    Maybe it wasn't a TV, maybe it was a disguised WWII electronic jammer covertly installed to interfere with radar. (That was a joke, for you literal members)
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    Heat Pump Relay Maintenance / Replacement

    I think most of us are hesitant to offer advice on HVAC because we don't know your level of expertise and would rather not enable you to kill yourself or start a fire at your house. You asked about the relay contacts. My limited experience with problems like you're describing is the Capacitors...
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    Adding a trim pot to a fan motor

    I'm wondering about your application. What is this small fan supposed to be cooling? If it's some particular instrument that is being cooled, it might be engineered for a specified airflow, and if you slow the fan down, the instrument/equipment might overheat and cause you a different problem...
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    Help fixing Fender Rumble 150 Bass Combo Amp

    My input is that it sure sounds like a short (but I guess is could be an 'open') in one of the cables. Did you try using a different set of cables and see what happens?
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    Reducing Voltage Drop over distance

    I want one of hevans1944's light bulb socket heaters. Never seen one before, haven't got a use for one, but want one. (Tired of salvaging old toasters to get nichrome wire). Thanks for the history lesson on those things.
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    Reducing Voltage Drop over distance

  16. S

    pioneersx780

    First thing I'd try is to replace the volume control potentiometer.
  17. S

    Help Identifying a Component

    I second ChosunOne's opinion. My additional input is that resistors don't burn-up by themselves. I'd be back-tracing that circuit and find-out what other component in there is damaged, that caused that resistor to overheat, otherwise you're going to be looking to replace your replaced resistor...
  18. S

    No power RX-V681

    I've spent a large part of my life repairing and returning units to life after other people threw them away. I agree with Martaine2005, that since you appear to be willing, open it up and see what you can see. You MAY find a device or two burned, that will point the way to where you should look...
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    Amplifier blows power fuse

    luvuyo, You probably found this 4-year-old thread in a Google search. Next time you have a question, it's better to start a new threat with your question. If you're using a multimeter to check a transistor, the multimeter can only tell you if you have an 'open' or a 'short' in the transistor, it...
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    CRT TV screen problem.

    I can tell you what I'd try, with the opinion that you might not get this fixed. You said it was working, then you heard sparking and it shut-down. First I'd look at every component inside the chassis to try to determine what was sparking, because that usually gives you burn marks to tell you...
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