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  1. S

    Varnish and rosin core solder

    You'll have to experiment. I always wash-off the excess flux. I try the spray contact cleaners first, a liitle on a corner of the board to see if it bothers the conformal coating. (with a clean solder flux brush) I've used a Q-tip with isopropyl alcohol, but it has a trendency to dissolve...
  2. S

    Headphones (ATH-M50)

    The small wires are typically coated in laquer, it's cheaper and takes up less room than other types of insulation on the wires. I take an exacto-knife or razar blade, and carefully scrap the laquer off the ends of the wires you want to solder, then you can easily solder them. My guess is...
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    Aiwa FX-WX9400 Double Cassette Deck

    Do you do equipment repairs? Take the cover off. Is it belt driven or direct drive?
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    data sheet

    Are you sure those aren't the device data codes? What are ALL the numbers/characters on the device? What kind of package is the component in (the case style)?
  5. S

    Difference between KA378r12 and 378R12 regulators

    The 'KA' denotes the manufacturer, and I don't remember off hand who that is. My guesstimate is they are both the same device.
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    Grounding / Earthing. What does these lines mean?

    I don't know where you're at. I live in the desert. We typically install a ground rod horizontally, and have difficulty GETTING a good ground, because the soil is so dry. (The actual 'ground' value changes with moisture in the soil). For your reading, it would help if you told us the make and...
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    UMEC Proprietary Surface Mount Transformers

    Before I break out my magnifying glass as tweezers to dissect these things and count the number of turns, I thought I'd ask if anybody knows anything about them. Obtained a large number of UMEC SM transformers, but UMEC says they're proprietary (in-house) numbers, and won't give me any info...
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    Hello from a newbie.

    People on this site LOVE to hear about new projects people are working on, and they've got some good advice when it's needed. It'll be good to hear from you when software advice is needed by others also.
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    Time for a moan about manufacturers

    I know I do. Do they sell bagels in Australia?
  10. S

    Laugh for the Day

    Damn. I didn't know that Trooper was going to make my story public.
  11. S

    Hello Everyone

    The place I work for has a lot of 1970's & 1980's test and measurement gear. The stuff was built to last and maintain accuracy. Sometimes it's harder to get parts on the older stuff. If you check back here often, you'll find a lot of people with info on Test and Meaurement instruments (and...
  12. S

    faulty car blinker relay

    Most of the time I've seen happen to me, it's the socket. The plastics they're using nowadays are pretty poor. Jeep socket plastic would often get soft from heat of the bulb (parking light use warms the bulb), and plastic that the metal contacts were in would flex, causing bulb to go out. I...
  13. S

    12VDC Sp rocker can I use it on 24v circuit.

    Besides over-voltaging the switch, you have to know the amperage. If you've got a high amperage circuit it'll play hell with the 12V switch if it's not designed for the amperage you're passing through it. (It SHOULD be listed on the switch itself someplace).
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    I need help with a transformer replacement on power supply board

    I'm still thinking your transformer is not the problem, as others here have noted. The transformer is the most expensive thing you'd be looking to replace, and you're going to be disappointed if it proves not to be the problem. I'd be checking the rest of the power devices on that tranformer...
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    Calibrating a Thermocouple

    You also have to consider what type of thermocouple it is, which I don't think was given. Thermocouples operate linearly only in a specific range of their characteristic curves, and the type (probably J or K for this range), matters for the circuit. I think john monks thermistor is a better...
  16. S

    Reed Switch Question

    If you have a multimeter, you can run a continuity check through the reed switch using the ohm function. Close to zero ohms for closed contact, Infinite ohm value for an open.
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    Please identify this part.

    The key is the manufacturer's logo. Yours is Fujitsu. Start looking for Fujisu data.
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    Identifying Tab & Receptacle Housings (Tyco?)

    If it's a Molex or Tyco connector, it will have a very small series number imprinted on it somewhere. You'll need a magnifying glass and a little patience, but those brands put their series numbers on each connector. They never list the complete part number, but if you know the series, you...
  19. S

    I need help with a transformer replacement on power supply board

    First, what makes you think the transformer is bad, just because you're not seeing the voltages you expect, or burn damage to the transformer? When you're reading voltages from a transformer, you need to be using the correct ground or your voltages will read wild numbers. Also, the...
  20. S

    Question about wiring DC input into boombox

    I'm wondering if we've got the full story. You mean the trailer will be parked, no vehicle operating, and you're just running off a 12V auto battery? Are you plugging into an outside AC power source, and recharging your battery off of that? This seems like a simple question, all we're...
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