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  1. S

    Detecting bullet not normal way

    I'm not sure I understand the question. If you're talking about an optical detector circut, the components are not all that expensive. Why don't you try Googling the idea you're working on, until you find something that looks similar to what you want to do. People here can offer better...
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    kenwood reciever

    I have a couple 1970's era Kenwood receiver/amplifiers. Your problem is the push-button switches on the panel. The push-buttons activate slide switches on the printed circuit board. The slide switches wear, and don't make good contact. You will find if you push buttons, and then push the...
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    Digital fan regulator repair

    There are three completely different components that I've found running the circuit in off the shelf light dimmers (the main circuitry can be run by different primary devices, not all dimmers are constructed using the same components). My first thought was that you might have a dimmer that...
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    Diode intermittent thermal failure

    I don't know if we've got enough information to give you the best answer. The 1N4007 is a low wattage device, do you have room on the board to install a higher wattage diode? I can't remember the part number off the top of my head, but I bought some high temperature diodes at one time that...
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    Thief detector alarm circuit

    We need more information. Inside or outside use? Range (distance to thief)? Anything else you can tell us about your application.
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    Digital fan regulator repair

    Is the fan wired correctly to the power? Is the fan operating at the voltage/frequency it was designed for? Is the 'digital regulator' programmed, or even used correctly, in this application? (Was it designed to run a ceiling fan?) I would guess from what you've said, that something isn't...
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    Detecting bullet not normal way

    Place in Canada makes the Chrony Model F1, widely available in US, last time I checked they sold for about $80 US. It not only detects the bullet (optically), it'll give you the speed of the bullet. Just an idea. Most circuits that do what you want, use optics. Your original idea of a...
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    bnc to trs

    50 ohm is for your function generator and test and measurement circuits. 75 ohm are for video feeds. I don't know your application, or your scope. Most scopes have 50 ohm input termination inside the scope. If you get screwy readings going direct from the function generator to the scope...
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    bnc to trs

    I believe your assumption is correct. I'm going to give you a warning in case you need it. There are 50 ohm and 75 ohm BNC connectors, and there are a few different sized pins for some of those center pins. 50 Ohm BNC's are very common, but it pays to match to your mating connector. The...
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    Your experience with Electronics?

    This makes 42 years as a technician. Got my first paying job in 1970, no college degree. Broke into electronics as a gradeschooler, picking the trash-day throw-outs of neighbors every friday morning before school. Clock radios, any electronics I thought I could fix and resell for parts money...
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    Help Identifying transistor

    How old is your equipment? It was pretty common to use 2N3055's (hfe 20 to 70). The problem nowadays is the early 2N3055's were very robust, and the newer 2N3055's are not. Some kind of design change to save money that made the 2N3055's just not as tough as the ones built in the 60's and...
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    Analog multimeter

    Make sure you have no voltage/current on the circuit under test. When your ohm meter leads are not touching, you have an open, high resistance. When you touch the ohm meter leads together, you have a 'short', zero ohms. The circuit you are checking for continuity will act the same as the...
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    Help removing a wiring harness. Please.

    I can't tell from the picture for sure, but MBVet05 has a point. Most connectors like that one I've found, have locking tabs. Either on the back side of the connector, or on the sides. Examine the connector closely, and look for locking tabs molded into the connectors. You pry the tabs...
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    SF139E

    I didn't check the data sheet, but I do know (having done it), that on very low amperage fuses, the ohmmeter current used to to test for continuity itself, can blow fuses. Ohmmeters aren't completely passive instruments. It generates a very small current that the meter needs to read...
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    Electric Gate

    Mine was a bad battery Did work on it, opened fine, then nothing, over and over again. I'd check that before I did anything else. Car repair parts stores will usually check them for free if you haul it in there.
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    How to repair this

    Was the iron plugged-in when you cut the cord? Maybe you shorted-out the heating element, so you're plugging-in a direct short every time you plug the iron back in? Got an ohm meter to see if the iron is shorted? If not, I suggest (again), replace the power cord with a new one.
  17. S

    Switch Identification Help

    Are there any part numbers or manufacturer logos on it?
  18. S

    Linear talks

    If you mean linear electronic components, as opposed to say, digital logic components, it depends completely upon the actual device you're talking about. There are 'families' of some product lines that have similar pin configurations, but the individual devices themselves do different jobs...
  19. S

    Having trouble with a simple cable

    I'd do some more digging for information about how that $80 cable is wired. It might be wired for some special configuration, it may have components in the connector assembly to drop the voltage. Maybe they put a 29 cent part in their cable assembly, that makes it different enough from your...
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    How to repair this

    Brother, why don't you just replace the damaged power cord with a new one? P.S. Buy another soldering iron, or borrow one, to repair the first one. You need to solder your repairs, not just tape them.
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