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  1. S

    Can a step-down transformer be used as a step-up transformer?

    Your theory is correct, but if you're saying you intend to apply 300VAC to the output of a 12VAC transformer, my suggestion is: don't even think about it. Whatever insulation you're referring to, is not going to withstand what's going to happen to your 12V wiring or the windings on your...
  2. S

    blank TV, viewable menus, powers off only with unplug. HELP!

    If you take the set to the shop, take the set, the remote, whatever control box, ... so you can be sure whatever is causing the problem (and anything that needs to be reset on your accessories), gets set up correctly.
  3. S

    Capacitor mystery

    The symbol on the bottom of your description might be an Underwriter's Labs logo. Ar you SURE this thing is a CAP? A lot of devices anymore kind of look like caps at first glance. They make a lot of electronic parts in Indonesia, somebody there in a repair shop might be able to ID the device...
  4. S

    What is this part called?

    Are you sure your input control power is wired correctly?
  5. S

    For Sale: wireless connectivity test set Agilent N4010A

    This is a Chinese vendor who posts for hits from time to time. Not an individual trying to sell items they use. Just for your information.
  6. S

    help please

    I'm tied-up with my own problems right now. I don't know anybody that makes them looking like that anymore, they're all encapsulated now, so when they blow-up, the pieces stay together. What you're looking for a transient voltage suppressor, or surge suppressor. Google them. All it does is...
  7. S

    Mobile phone detector doesn't work properly

    Only time will tell. Who's at risk for what cancers, how many years might it take, all unknowns. I don't know how many studies were ever done with low level radiation over long periods of time. This will be a good study, because the years are adding up. BobK has a good point, but with so...
  8. S

    help please

    Look, I've never seen one go bad that didn't have visible physical damage to it. Is that lead separated from the device? What makes you think it needs to be replaced?
  9. S

    help please

    It's a input power surge arrestor, pretty common in 1980's gear. What did it come out of?
  10. S

    MPS750

    NTE Electronics is stocked by a lot of stores. MPS750 crosses to NTE2658 (equivalent device)
  11. S

    I need HP Agilent 8590A service manual

    www.agilent.com They've got the manuals on it there. Test & Measurement instruments, support, type in the model number and it tells you the instrument is no longer supported by Agilent, but there's a specific selection on the upper part of the screen that lets you select 'Manuals', ... type...
  12. S

    5-PIN DIN Adapter

    You're in CA, somebody must have one close by. If you have to mail-order it: Mouser, Digi-Key, Parts Express, ... just Google the device for vendors.
  13. S

    What is this component?

    timothy48342, I don't have a site for you to check, but when I run into the color banding system I Google it. The diode color band system is for three, four, or five bands, so you really need a chart when you're trying to identify one. I printed-out a good copy of one of the charts (but I...
  14. S

    Personal Attack Alarm Circuit Diagram

    Is it worth the effort? You can buy one for less than $10 that runs on a 9v battery.
  15. S

    TH42PZ70B4Panasonic Flat Panel Television

    If you don't have a manual on your set, try emailing or looking at the Panasonic website to get information on your model number. The seven flashes would indicate an error code to me. Find out what the error code is from Panasonic, and you'll have a better idea what to do.
  16. S

    Silent Gliss 5090 Autoglide

    Yep, the end switches are called 'limit switches' in the States. Something in the gearbox is supposed to physically contact the lever on the 'limit switch' when it reaches the end of travel (full opened or full closed curtains). Something might have broken off that makes contact with the limit...
  17. S

    square tactile switch

    Yes, if you can, get a switch that mounts flat on the board, or will mount in a round hole. What you need if you do a lot of square holes in chassis, is what is called a 'chassis punch', in the size you want. They're kind of pricey, but if you do a lot of one particular size, that's the...
  18. S

    square tactile switch

    If it's a one-time job, Radio Shack sells a 'nipper' that cuts square holes. You drill a hole, the nipper inserts into the hole, and you 'nip' the round hole into a square shape with the hand-help device. It looks like a pair of pliers, but is designed to nip at material to fashion a square...
  19. S

    Hi

    We were all newbies once. I imagine more people will respond to your posts when you ask or suggest something. People on this site are very helpful.
  20. S

    Just Joined

    People on this site are pretty helpful. If you explain what you want to do, somebody will come up with some good ideas.
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