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  1. S

    ultrasonic cleaner, help needed

    Wish I could get my mits on that board for a closer look. Can't see everything as well as I would like. I assume the two devices you're talking about are the (bright in the picture) cogged wheels. Do the cogs mesh with a micro-switch lever? I was wondering if maybe the devices are small...
  2. S

    Turn a log pot into a (kind of) linear pot

    Yeah, it's called a logarithmic pot in a linear pot application. You got a lot of good advice for trying to make your circuit work here. We think in terms of adapting, modifying, and just plain MAKING things work. It's probably why you came here asking for advice. Unfortunately, you are...
  3. S

    ultrasonic cleaner, help needed

    If you can identify how the two trimmers are wired, that would help figure-out their purpose. (If you can get at the wiring). I'm wondering if they're wired in parallel, kind of a 'tank' circuit to balance frequency/current flow. Or if they're wired differently to two separate points in the...
  4. S

    Turn a log pot into a (kind of) linear pot

    I hope some of you guys aren't designing my next consumer product buy.
  5. S

    ultrasonic cleaner, help needed

    I don't know, but I'm interested now too. Are you sure they're both resistor pots? Could one be a resistor and one a capacitor? Could one be an inductor, and the other a capacitor? (for tuning the circuit) Might be current control through the transducers? Hope somebody that knows answers...
  6. S

    Turn a log pot into a (kind of) linear pot

    You'll only compound the problem by using the wrong pot. Can't you swing a deal with the supplier to swap the audio pots you got for linear ones? You may not think you've got an option, but if you don't fuss up to the issue, you may lose your job before the replacement pots get there. Cause...
  7. S

    T. O. metal can electrical test rejects

    I'm mention one other problem I saw once using epoxy to set a photo device: One type of epoxy we used cured leaving a gaseous 'cloud', which left a film on the photo device's lens. May not be an issue, but something else I thought of to be aware of. A secondary consideration for installing...
  8. S

    Powerline Communications

    These things were extremely popular before the advent of home-computer use. I don't know who bothers with them anymore. Did you try Googling this for information?
  9. S

    digital indicator with 3 setpoints

    Do you have the contollers already, or is this just a general information question about how to do it? A couple suppliers I can think of off the top of my head are: Red Lion and Acculex The next thing you have to consider is are you running these things independently, with a programmable...
  10. S

    Solenoid... What power supply?

    Your power supply, is going to depend on the parameters of whatever solenoid you select.
  11. S

    rca tv wont turn on

    Wow, not much to go on so far. What's the model number of the set? Did you check the fuse first? It SOUNDS like you've got power to the on/off function, and you may very well have a power supply problem, but it's hard to know what to look for with so little information. Be warned however...
  12. S

    small Magnetic motor repair (this shoudl be simple!!)

    All good ideas suggested. Here's the one I resort to when I've checked everything else: The motor is binding because it wore-out, and needs to be replaced. MANY times I find the armature physically scrapping the frame. Any number of reasons why; Shaft warped, oxidation or corrosion on the...
  13. S

    20+ hours banging head off wall

    My first idea, is to contact OMEGA, they've got a staff who helps with their products. I'd do that before I did anything else. My second idea, is questioning if your panel meters are somehow being daisy-chained when you energize both of them at the same time. Take a close look at the wiring...
  14. S

    T. O. metal can electrical test rejects

    Some manufacturer's use the black coating on the caps, some don't. It doesn't interfere with the chemical reaction. Any possibility the curing of the epoxy is discoloring the epoxy, causing you problems? Any possibility of wiring bonding (typically high voltage, similar to arc welding)...
  15. S

    Electronic Siren problem

    Odds are that *steve* is right. When rechecking your wiring, do not assume simple connections are correct. Carefully recheck every connection. If you still can't find a problem, recheck your pin-outs on the transistor to make sure it's installed correctly. Also the LM324. If you think...
  16. S

    T. O. metal can electrical test rejects

    What is the composition of the new capillary? Are you experiencing a chemical reaction with your process media and the new capillary?
  17. S

    Series Potentiometers?

    I'm not looking at your set-up. You're ID indicates to me you're new at this. I'm going to tell you what I'm thinking, and you can determine if you can use any of it. You sound a little impatient about getting an exact answer, so I may be wasting my time. Resistance measurements do not...
  18. S

    Series Potentiometers?

    First. I have many times found pots that are unreliable at the low and high-end resistances, because the 'stop' on the pot is not exactly at the ends of the carbon-trace of the pot itself. Apparently this is an acceptable inconvenience in mass-produced pots. I'm just telling you this, so...
  19. S

    T. O. metal can electrical test rejects

    I still don't see enough information to give a coherent opinion. My experience with 'dark current' involved photomultipliers. We used a deuterium lamp souce, through a chemical reaction in gas, to read the luminance via a photomultiplier. In the application we had, often the life of the...
  20. S

    T. O. metal can electrical test rejects

    What is the device. And are you talking about hermetically sealed metal can packages as opposed to DIP's? (Did you check your data sheets carefully?)
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