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  1. B

    Help needed with rocket timer circuit

    Black wire (negative) does not appear to connect to anything on both photos from #10 and #17.
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    How much of a Short circuit is too much?

    I do believe the Op asked "how will I know if I will blow the circuit" to which I referred to Ohms law. Also as I read it, the receiver requires 12v not 3v or 6v.
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    Replace fried range hood transformer with cheaper alternative?

    Pricey..?? Most I've seen on Ebay are around $10.00. One here is 240vac but I'm sure you can find 110v ac ones where you are. http://www.ebay.com.au/itm/6pcs-Electronic-Dimmable-Transformer-12V-60W-also-use-for-some-type12V-LED-lamp-/172148511774?hash=item2814d9d41e:g:imYAAOSw9NxTtmAa
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    How much of a Short circuit is too much?

    Ohms law.
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    Model Railway elevator

    You could use these slot opto sensors. Mount the sensor on a fixed section and a vane on the moving section. In the past I have found similar ones from old printers to be repeatedly very precise.(within 1 thou inch on a travelling carriage) You will need some interface between these and your...
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    Solvent to clean solder site

    Maybe your iron is too small.
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    Electric Bike

    I thought I did...?
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    Fisher & Paykel wall oven # OS302

    No door switch on an oven. Could also be crook connections on the element spade terminals.
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    Replace fried range hood transformer with cheaper alternative?

    In addition to Bob's answer above, you could use the replacement if you also replaced the lamps with 2 x 20W.
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    Electric Bike

    Affordable controls available from here........ http://oatleyelectronics.com//index.php?cPath=94&osCsid=be6f53c072fb6637b58be390a4ff4679
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    Microwave movement detector module

    Used a couple of them now. Pain in the neck as customer complains about light coming on in the cupboard all the time, not just when they go to open it. It was their suggestion initially and all the resons why not to use it fell on deaf ears...
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    Ford Flat-Pack Ignition Modules

    I'm guessing they are CDI coils not Kettering which is why your "12V test" did not work. May have damaged the coils actually. There are a few cdi ignitions around for model engines that should test your coil ok. That is if it is just a coil , not something with additional internal circuitry.
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    12v variable 555 timer circuit with motor

    You have threshold and discharge shorted (6 and 7)
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    Help needed with rocket timer circuit

    Is your buzzer actually a buzzer and not just a piezo unit requiring an external oscillator driver to operate? Perhaps it would be a good idea to just use an LED as an indicator and a resistor of appropriate size to suit what ever voltage you are running.
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    Help needed with rocket timer circuit

    Might have blown the transistors by being connected wrong.
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    Defective PCB/scroll saw

    Sounds to me like you need to be careful of where you are taking your measurements from with respect to common or negative probe.
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    Help needed with rocket timer circuit

    Transistors were quoted as A1015 SCR's are mostly the same but it was quoted as 200v 6A Hal, ...BTW....SC1 is IRF530n ...is a mosfet That website link threw up a virus warning also...??
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    Powering an IDE box for an external HDD

    Could get one of these and change the power connector.......... http://www.ebay.com.au/itm/USB-2-0-to-IDE-SATA-S-ATA-2-5-3-5-HD-HDD-Hard-Drive-Adapter-Converter-Cable-SW-/151767936816?hash=item235612ef30:g:bfoAAOSwjVVVwGLK
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    Help needed with rocket timer circuit

    Also I notice you have a mosfet in place of the SCR. I find things easier when circuits are drawn in a conventional manner and have sketched it out below.
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    Help needed with rocket timer circuit

    Yes As Colin says, Emitter = 1 , Collector = 2, and Base = 3
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