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  1. S

    hissing in earphones when laptop plugged in

    If it's under warranty, contact the mfgr with the problem. If phones work ok on battery, but are noisy when computer plugged-in to the wall, you're picking-up noise from the power line, or power supply. You try to 'fix' it yourself, you WILL void warranty.
  2. S

    backup power for Car audio receiver

    Maybe someone else will answer your post with a good solution. I don't know your set-up. It should take no more than 3 volts to retain the memory in your car radio, ....but that would be to the memory circuit itself, not the actual 12v power jack to the radio. You'd have to get inside the...
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    760A METER CALIBRATOR

    I'm not familiar with a 760A anything. It might help on this site if you specify the manufacturer. Frankly, you have a circuit failure. If you're not skilled in repair, you'll need to have somebody with a service manual work on it. If you think you can do your own troubleshooting, you're...
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    Rear Projection TV

    This probably won't help, but you're describing problems similar to a failed degaussing coil on an old style CRT picture tube. I don't remember much about working on the old projection TV's. If you're sure there's nothing new which could be screwing-up your input signal, you may have a circuit...
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    backup power for Car audio receiver

    Why do you want to turn off your power supply? When the radio itself is not 'on', the standby draw from the power supply, to keep your radio presets, is extremely low. I'm not familiar with the power supply you're using. Maybe you should look for a different model, made for people who are...
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    Rear Projection TV

    Check the obvious first. What are you using for your input signal? Are the lines on all the channels? Even if you have cable, there might be a problem with the signal to the TV. Before you do anything to the TV itself, check that that input cable, wherever it's coming from is not causing...
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    Compare two voltages and output difference

    Look into 'comparator' integrated circuit chips.
  8. S

    Hitachi TV died.

    Power on-off switch itself defective?
  9. S

    measuring L using VNA

    He's talking about an inductor's 'Q', and a vector network analyzer. There are probably a dozen ways to do it, and they're all accessible on the web. I like the give and take info on this site.. People know more about some things than I do, and I try to help somebody asking something about a...
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    Need help with part number search

    You're probably going to have to get it from an appliance repair supply house anyway. Call up one in your area, give them the Make, model number, and maybe serial number of the diswasher, and they'll be able to identify the part number (probably a GE replacement, or equivalent). If you don't...
  11. S

    Hardware for vibration purpose

    Edmund Scientific catalog has some unusual items, that might work in your application.
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    Hardware for vibration purpose

    Piezo element? I've seen several interesting configurations in different types of devices. Might be too fragile for intense vibration you might be considering though. Just another idea to consider.
  13. S

    Hardware for vibration purpose

    That's pretty low freq. Try the surplus people at All Electronics Corp in CA. They sometimes stock small vibrators from end of production runs for toys that vibrate, pager vibrators, and things like that. They're on line, and if you ask, they'll put you on their mailing list for regular catalogs.
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    40 awg

    I don't know where you're at. What you're looking for is 'wire-wrap' wire, in one of several guages they make. Newark in the U.S., (Farnell in U.K.) But there HAVE to be plenty of local places wherever you are. Just cruise the internet for 'wire-wrap' accessories.
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    inductor

    You can find a lot of circuits on the web for your design. You need to change HOW you're thinking about the value of an inductor. When inductors are made, manufacturers determine what standard inductance values they want to make. Their test frequency to create the line of inductors they will...
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    Tektronix 2465A U800 Problem again.

    Haven't heard anything about an equivalent. QService lists new at $140. If that won't do it for you, try finding one from somebody who strips them used out of salvaged instruments. If this is an 'again' thing, like you said, you better get into that horizontal output circut, and find-out...
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    Learning Electrical Repair

    It seems to me most consumer electronics nowadays IS made to be disposable. Most of the encapsulated stuff you see, IS non-repairable stuff. The field is SO wide now, that you should consider what type of electronic repairs you want to know how to do, and concentrate on those, Car...
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    Trying to find capacitors for tube amp

    You won't find them made out of wax and paper anymore. I don't know what stores are near where you are. But check with an electronics supply store in your area. Tell them what you want, and they'll be able to tell you an equivalent.
  19. S

    designing floor standing and table lamps

    I don't know about the UK. Is the US, they use 'Underwriter's Laboratory' approval. My guess would be, whatever you come up with, would have to be checked for electrical safety, before you'd be able to market it. Whoever certifies electrical safety where you are, should be able to help.
  20. S

    Tube amplifier w low volumes

    Tubes are amplifiers, that's a pretty-good bet. If possible, find somebody with a tube checker, so you don't have to just replace all of them. If you do just replace them, shop around. There are incredible price differences for tubes these days.
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