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  1. S

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  2. S

    Is there anything useful in a photocopier?

    If they're for your work and you have others of the same model, I'd try to salvage the easily worn/breakable parts in case you need them to replace on other units. Besides electronics, some of those gears and rollers get hard to find after a few years because of the constant upgrading of newer...
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    Could somebody help explain the workings of this circuit in plain English

    I'm thinking you mean you're not sure what's going on because you see three separate circuits that are not physically connected to one another. With these type of schematics, you're supposed to follow the input and output of each component or individually drawn circuit, and then find the similar...
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    Purpose in syncronizing electronic signals

    Now I'm beginning to wonder if you're talking about some kind of digital command signal sync? If it's not for a power supply, what type of circuit are you wondering about for a sync signal?
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    Purpose in syncronizing electronic signals

    That's kind of an open-ended question. If you want an accurate explanation, we need to know your application. What power supply, and what external sync signal are we talking about? A little more information please.
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    Remote switch

    If this was me, the first thing I'd do is try to find the operating manual that came with your system and see what it says. If you don't know where it's at, see if you can download one from the manufacturer or a Google search. Then I'd call the manufacturer themselves, and explain what you want...
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    Faint display on Aiwa Tuner

    The fluorescent displays operate at a pretty high voltage. (So be careful and see if it's listed in the manual) And again, they DO wear out with age. There probably is a pot in there to adjust the voltage for the display (within a small voltage span range). If you've tried it, it may already be...
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    Transistors

    Are they the big TO-3 Metal Can Packaged transistors? They can get hot. I'd help us help you if you tell us the make and model so somebody can check the schematic. For your general information, the first things to go on the old sets are the big electrolytic capacitors. They dry out and don't...
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    Faint display on Aiwa Tuner

    ARE, those LED's? It kind of looks like it might be one of the old flourescent vacuum displays, and they just get dimmer as they age (and nearly impossible to find a replacement) (And no, I didn't look at the manual, just the pictures, ... )
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    B&t Tracer unit, xenon flash not working.

    Can't help with what I know so far. Have you got a model number of this device, maybe a schematic. You're generating High Voltage from 4 each 1.5V batteries, so I suppose anything could have taken a hit on that circuit board. I'll also mention, that it's not all that unusual to just burn-out one...
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    Help me figure out what this is

    Yeah, I'm thinking somebody made or bought this as a way to try to reduce power usage, probably within a home. They were all the rage here a few years ago, with people trying to cut their electric bills. If you can't figure-out what to do with it, like clock-boy (now living in Quatar), see if...
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    Heating a component in the interests of thermal stability.

    I would guess the reason to not add components to any mass-production type equipment would be cost savings if the temperature range conditions were acceptable with a common heat sink. High-end test and measurement equipment often have temperature controlled 'ovens' within them to maintain output...
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    Variable capacitor

    Yeah, I don't think anybody makes the old air/fin variable caps anymore. They were commonly used in old radios for tuning. Any old electronic scrapyards near you? Some place that would have a scrap heap of old discarded electronics? Amateur radio clubs in the area might be able to find you one.
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    Access Control Turnstile Gate - Need help with circuit

    Is it possible to get the wiring schematic from the manufacturer or Google it? You seem to have most if not all of everything you need. Typically these things work (yours at 24V and/or 12V) by whatever trigger device used to activate the circuit. A signal is sent to energize a relay which drives...
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    Beehive scale

    You're talking a microcontroller, so you should be able to Google information that will help you set the microcontroller up for specific functions. Your initial issue I believe, can be solved with a TDR (time-delay relay). When the trip weight is reached, the relay latches for however many...
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    Transforming hammer help

    Think of some of the small toys manufacturers make for action-figure accessories. Just bigger. Spring-loaded tubes and guides will activate plenty fast enough. Just realize this is a complex and time-consuming project. Everything has to spring-out and lock in place, then be able to retract...
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    Beehive scale

    I'll throw-in my 2-cents worth. I think Ivan's issue is that he believes he has a system that will work for him in measuring the weight of the beehive. The issue is that I believe he wants to activate a phone when the weight changes. But only once when a specific weight it reached. That could...
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    Transforming hammer help

    I think this would be one very expensive electronic device. And pretty complex to build. Have you considered just using springs and levers, 100% mechanical?
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    Federal Pioneer Enclosed Switch 86311

    Well then, Minder has the answer. There is no continuity between the mounting screws and the bar, for isolation. The bar is a common connection point for the neutrals.
  20. S

    Federal Pioneer Enclosed Switch 86311

    I guess we need to know more about the bar itself. Are the five screws simply hold-down mounts for the bar itself? I would suppose that's the reason for the electrical isolation from the bar. Is there some other electrical connection to the bar, maybe even direct contact with electrical...
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