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  1. S

    Trying to Attach Momentary Push Buttons (Rocker-Type) to a circuit board with Silicone Buttons.???

    'Magnet' wire has me stumped. Maybe you're referring to small gauge wire similar to the type we used to use with the old dry cell batteries to magnetize iron bearing implements? Yes, you need smaller gauge wire simply because you're dealing with small circuit trace and low voltage. I don't know...
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    Trying to Attach Momentary Push Buttons (Rocker-Type) to a circuit board with Silicone Buttons.???

    Yep, KeithM has accurate advice. Your switch uses the maze-like configuration on the top-side of the board as the switch contacts, and when you press down on the blue actuator, the carbon pad underneath it makes the actual contact across the maze-like trace on the board. One side of the maze...
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    Need help to getting started

    I'd start by checking those Google hits. When you see one or two you really like, THEN ask what we can add to help you with this.
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    Trying to Attach Momentary Push Buttons (Rocker-Type) to a circuit board with Silicone Buttons.???

    Sounds simple enough. Since you're relocating the switches, physical room necessary is not much of an issue, so you can use normal-sized switches. Do you have any experience using a soldering iron to add or replace electronic wiring? From your picture, the round circuit board with the three...
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    Need help to getting started

    When you decide what specifically you're interested in doing as cjdelphi suggests, you start looking for literature (Google) information on that subject. People here can give you tips on how to find parts and build what you want, but you need to know as specifically as possible what type of...
  6. S

    Trying to Attach Momentary Push Buttons (Rocker-Type) to a circuit board with Silicone Buttons.???

    Certainly it's possible and not very difficult. The problems I see are what we don't know about your circumstance. Do you need the replacement to fit back into some specially constructed housing? If so, you will have to search for a physically compatible size and shape of switch and actuator...
  7. S

    Mulitmeter

    Did you open it up and look for a blown fuse? If fuse is ok, look for physical damage, burn marks from the AC input jacks to the electronic component board.
  8. S

    741 Op-amp

    Like this: (I don't have time to check the specs on everything) CA3140E TL081CN TL061CP TL071CP LF351N MC33171N, For high freq applications I've been using the LT1793
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    Where can I find 78H12, 78H15, 79H12, 79H15? Or something similar?

    That's an old one. Did you try eBay? I see them there.
  10. S

    741 Op-amp

    Maybe an LM324
  11. S

    GY512 Diode

    I feel your pain. I too have a large number of these diodes and no information at all about spec sheets on them. I was never able to locate the data for them. Don't know if they were proprietary marked for a particular system, or if they were a regular production line model before the JEDEC...
  12. S

    Monochrome display wiring

    It'd help if we knew any information on the make of the display. Do you have a mfgr and/or model number?
  13. S

    Scope calibration

    Then you'll do alright. Most everybody just needs 'ballpark' readings. Anybody who needs perfection will turn any questionable instruments in for standard-lab calibration. Considering what you want to do, I'd find quality instruments with tight specs to verify your circuit repairs. Then list...
  14. S

    vacuum fluorescent display (VFD) help

    First off, thoroughly check your manual, and see if you have some kind of 'dimmer' option activated that's unintentionally dimming the display. Second, these old Flourescent Vacuum Displays where hot stuff when they came out because they were the newest fancy thing. I don't know anybody that...
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    Scope calibration

    This is the standards lab guy again. I'm back because you appear to be genuinely interested in this topic. You can buy whatever instrument you want, but if you don't REGULARLY, usually specified by the manufacturer, have the darned thing traceably CALIBRATED, ... you may or may not be in spec...
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    GY512 Diode

    Trivia. I have a number of similar diodes, marked with two characters (letters). Mine were made by Fairchild, who sold their diode-making enterprise a few times already. I contacted Fairchild, the diodes were made before any of the people I talked to were born, and they (being in one of the...
  17. S

    Scope calibration

    I rest my case.
  18. S

    Scope calibration

    I know what you're saying. My input is just that calibration to factory specs is one thing, and getting the scope to what others might consider acceptable, is another. Good work on the scope repair.
  19. S

    Scope calibration

    I'll just add this input. I work in an electronics standards lab. I've read a lot of posts over the years here from people asking about calibration. And I've interpreted them to mean different things for different people. 'Calibrated', just seems to mean 'in the ballpark' for most people, and...
  20. S

    Voltage regulator 7905 capacitors.

    What is the application? Typically voltage regulator circuits are non-critical and electrolytics are fine. Your circuit determines the need for specialized composition capacitors. Are you working at high frequency, high temperature, or other specialized applications?
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