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  1. S

    Float switch circuit for fish tank

    Nope. I don't know how to post drawings on this thing, if my kids visit me for the holidays, I'll see if they can show me how to do that on these fancy computer websites. Try drawing the circuit out yourself there. The relay is de-energized, and at rest. The low-level switch closes the circuit...
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    Air compressor slowing/stopping under load

    That's a pretty normal indication that your motor is at the end of it's life-span. If Sears doesn't sell a replacement motor for it these days, there are plenty of places that will have an equivalent. Try Grainger, or power tool repair shops in your area.
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    Float switch circuit for fish tank

    Wrote a nice addition, and site timed-out on me, .... One more time, .... I reread post. Use one relay. Wire one set of contacts on relay to interrupt the power to the relay coil. Low level switch activates relay, sending water into tank. High level switch interrupts power to relay, stopping...
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    Float switch circuit for fish tank

    Ex-sewer worker here. If your float switches are the same, (it matters if they're normally open or normally closed), wire your circuit for each switch to operate opposite of one another. It's senseless to describe circuit wiring not knowing if your float switches are NO or NC. Just think about...
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    troubleshooting with bulbs?

    I used to use bulbs for cleaning the probes inside magnetic flowmeters, so I wouldn't have to open them regularly. In your case, it seems to me that all you'd be doing with an incandescent bulb, is using it as a fuse. (Unless you're using a bulb rated for a voltage much higher than what you...
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    Motorola 365 Transistor

    I've checked every cross reference I've got. Can't find any standard for the 365/026 made by Motorola. Like I suspected, you've probably got a part made by Motorola for some company, that owns the rights to the part numbering system. (Motorola made it for a company, and stamped that company's...
  7. S

    Motorola 365 Transistor

    If your transistor is actually stamped with a slash between the two, three-digit numbers, disregard this post. I'm guessing your part is stamped with a proprietary (people on these sites call them 'in-house' part numbers, with the data owned by the company they're made for). Fluke has 6-digit...
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    Locking controls?

    When I do this, I use a multi-level rotary switch. That way you can wire the different indicators to turn on or off, in relation to the circuit configuration. I don't know your circuit, but I've found if I want one circuit to be doing something, then switch to another circuit, I want the first...
  9. S

    Comp speakers, bass only makes buzz now

    First, try plugging the speaker power in, BYPASSING the surge protector. Make sure the surge protector ITSELF wasn't damaged, causing your buzzing.
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    HP54512B oscilloscope with undocumented warning

    In repetitive mode the waveform is constructed by triggering the acquiring data on successive repeating events. (If signal is repetitive, like a system clock, a very accurate waveform can be constructed from repeated acquisitions). Data is randomly captured into a circular buffer through a A/D...
  11. S

    Basic, Quick Question

    Recharge the battery overnight, and you should be happy with the results.
  12. S

    LeCroy scopes vs. Tek and Agilent for a specific measurement

    I repair test and measurement instruments. Hewlett Packard lost a lot of expertise when they became Agilent. Tektronix had a great reputation, but has been living off it's rep for a while now. Most everybody I know has been breaking into the LeCroy's for the reasons you list. Cheaper, and...
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    Freeloader problem please?

    Probably a circuit problem, but something to check first: My daughter had this problem, and it turned-out to be the connector plug from the charger that connects to the phone itself. You might inspect the connector for possible damage.
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    [Q] How to calculate influence of metal object on dc biased coil?

    There seem to be a lot of commercial vehicle sensors in pavement in my city. Have you tried contacting any of the manufacturers of these devices? You might be able to gleen some helpful information from their contact people or literature they may send you for free on their systems. I like...
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    Purchased pioneer deh P980BT it skips or cuts out at random

    How well do you know this guy? Don't throw good money after bad. He can't possibly troubleshoot your CD player without looking at it first. Is he going to check it and THEN quote you a price? (Just things to consider). It plays until you jiggle it, so the LASER is ok. It's the assembly that...
  16. S

    Sharp 20MH10 TV won't start

    You've got an open circuit somewhere. I'd be checking the power supply circuit first and foremost. Most likely a component (open circuit).
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    Basic, Quick Question

    Uh-Oh, *steve* must be an engineer. I'm a tech. .... hole flow, or electron flow, .....
  18. S

    Purchased pioneer deh P980BT it skips or cuts out at random

    There's a lot of tech involved in anti-skip engineering of the CD players. Hopefully your elec engineer might see something he can do, but a shop would not charge less than what you probably paid for it. (If they offered to try to fix it) I agree you were cheated by the seller, ebay probably...
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    Digikey search feature added

    Yeah, but my experience with Digikey, is they list a heck of a lot of items on their internet sites, that they no longer stock. It irritates me everytime they do that.
  20. S

    Basic, Quick Question

    Any possibility of just putting a rechargeable battery WITH the motor? Are you just going to turn it on and let it run, or do you need to vary the speed, or start or stop it along the route of the track? Just another thought to consider. That way the motor power would remain constant. My...
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