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  1. S

    question about temperature of amp output transistors

    Well, I use heat sinks on the TIP31's and 42's I've installed. If the circuit works the way you built it, I'd try some heafty heat sinks. At the very least, they'll extend the life of the transistors. They might cost a lot from Radio Shack, but there are plenty of places you can get a...
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    Texas Instruments Proprietary Part Numbers?

    Got a drawer full of IC's I can't remember what I used for. Anybody recognize the marking sytem for these Texas Instrument IC's? What company they were made for, or what the devices might be? 14-Pin DIP's: 561 7034 BP853601TS 561 7032 BP8S3600TS 16-Pin DIP's: 561 5594 BP866542TS 561...
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    condonsator polarity test

    This really sounds like a general information/theory question to me. Unless he's working on some kind of industrial machine, like an old arc welder or something. I use a Sencore Z-meter for checking caps. With apparently no way for emraude2008 to identify the polarity, marked on the device...
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    Inconsistent problem with LCD display

    I agree, could very well not be the screen itself. The processor, or the display driver circuit to the screen. One thing I've noticed from gear from musicians, is a propensity for the circuitry in their gear to suffer from operator lifestyle. A lot of smoking going on where the equipment is...
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    condonsator polarity test

    Yeah, it's called a DVM
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    condonsator polarity test

    We know you're talking about a capacitor (they were called condenser, in our younger days). But *steve*'s right. We need to know exactly what you're talking about. If you have something that is very old, it may very well say 'condenser' on it somewhere. And if that's the case, it's important...
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    Will I fry my device?

    Oh. You seem to be wondering which of the two wires on the Radio Shack cord, goes to which end of the cigarette lighter plug. I'm guessing you don't have an ohm-meter (multi-meter). If it's not designated on the plug or the cord (look at the assembly, and see if you can see a plus for...
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    Will I fry my device?

    The outside shell of the cigarette lighter socket is the negative, it's grounded to the car chassis, which is electrical ground (negative) for the car. The metal button in the center of the end of the cigarette lighter socket, is the 12VDC (positive). On the cord you got from radio shack...
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    Will I fry my device?

    Your device will draw only the amperage that it needs. The Radio Shack 10 amp reference, is to tell you that is the MAXIMUM current the CORD is designed to handle, NOT that you WILL draw 10 amps because you're using it. You'll be fine using the Radio Shack cord, just make SURE you've got the...
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    52" rear projecter won't turn on help please

    I haven't worked on this model before. Do you have, or can you get an operator manual on this set? An LED that flashes three times, would seem to be some type of indication of a problem, that the manual might mention. Maybe even trying an email to RCA website, with description of the problem...
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    help to run dc brushless motor

    Well, I guess my first question would be, what voltage does that 'brushless motor' operate at? Your IC operates at 5V. If your 'brushless motor' operates at a voltage/current higher than your input voltage/current to it, the motor won't spin. Are you wiring this thing in such a way as to...
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    Woo-Woo Capacitors

    Like *steve* pointed out, your question is overly broad, and lacking enough detail. This sounds like a theory stage right now. Basic info on you orginal question is: Tantalums are going to be too low voltage for your application. Ceramics are generally for tight voltage/frequency...
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    Anyone Know what this is?

    You've probably got at least one bad transistor. Do you know how to check back to back resistances of the transistors, to find the open one, using a DVM? I'd start with the transistors tied to the leg of the capacitor you replaced.
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    Project: The Star Trek Room

    This is an idea for you. When you start building your own lighting for your ships, look into the circuits and kits for fading LEDs, or color changing LED's, instead of just blinkers. I've been impressed by the effects some of these LED circuits visually, and it would give your ships more the...
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    HP Plasma Tv problem

    It's hard to guess. Typically something else blows, and the caps go. But there have been a few times when it actually was ONLY the caps. Did you look around for any other obvious circuit damage? I don't think anybody will be able to say for sure with no other available information, but...
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    Anyone Know what this is?

    Yeah, it's a cap. Can you give us the numbers/markings on it? It looks like its readable, but your photo is turned sideways, and is hard to read for us.
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    White residue on IC connections???

    Yeah, I'm with davenn. That white residue is leftover from the board assembly process at the factory. One thing I'm starting to notice also, is some new spacer pads (to get the component up off the board during assembly), that the manufacturer (who I can't remember right now), CLAIMS...
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    Treadmill troubles

    Have you got a basic electronics background? Are you able to check electronic parts and sensors, or are you asking for advice as a layperson in electronics? It'd help if we knew your skill level in troubleshooting.
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    Watlow Process Controller Help

    One more thought. You might be able to get some information on this system from the manufacturer of your FURNACE. The FURNACE manufacturer may be the contractor who had Watlow/Lindberg make a proprietary controller for them. They might be willing to share their information to keep your...
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    Watlow Process Controller Help

    Alright. The only time I've ever seen something like this happen, is when some contractor specifically has a manufacturer make a custom instrument or system for a specific job they bid on. The contractor owns the rights to the system (like proprietary parts for a company). Unfortunately, a...
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