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  1. kellys_eye

    National Computer Electronic Flash Unit.

    Did you insert the batteries correctly? Here's the user manual for it: https://www.manualslib.com/manuhttps://www.manualslib.com/manual/851970/National-Pe-387s.html#manualal/851970/National-Pe-387s.html#manual Check that the terminals in the battery holder are clean and still springy enough...
  2. kellys_eye

    Outlet with sensor

    Such socket have to fit in a standard backplate/box too.....
  3. kellys_eye

    Car battery jumpstart gadgets

    I'm assuming you're referring to all the additional functionality many such charger/starters offer? Given the total simplicity of a jump start unit and the power that is otherwise 'sat there doing nothing' the manufacturers have added inspection lights, cigarette lighter sockets, volt meter...
  4. kellys_eye

    Car battery jumpstart gadgets

    It's called a BATTERY CHARGER and they already exist. Use an extension cord if you need to. Those portable kick start devices are intended for those (rare) occasions you aren't close to an easy mains supply or even off-site completely where they come into their own. If it happens at home you...
  5. kellys_eye

    g'day from skippy land

    Call that a croc? <searching desperately for a picture of my wife....>
  6. kellys_eye

    Hello.

    Welcome. You will find this forum to be friendly and informative - hope you plan to stay!
  7. kellys_eye

    Need help with making a circuit for a peltier module

    To heat or to cool? Either way you need a constant current source where the current chosen is representative of the temperature produced - which itself will be a product of the peltier and the heatsinking attached.
  8. kellys_eye

    ECM - Jeep computer - help IDing the motherboard please.

    Your current level of knowledge seems relatively low (no insult intended, bear with me...) which makes this process, that is difficult to begin with for even experienced engineers, seemingly impossible for the average amateur. You should also be aware that the OEM will have some very strict...
  9. kellys_eye

    Using PNP or NPN Transistor as a switch

    Base resistor is calculated from the collector current New thread please! And thanks for pointing to the resource for the resistor selection.
  10. kellys_eye

    Carpenters mistake

    Looks to me as if the blob was created by the OP de-soldering the original leads based on where the 'tracking' runs from. The manufacturing process (solder reflow/bath) isn't capable of making a soldering 'error' of that type.
  11. kellys_eye

    Using PNP or NPN Transistor as a switch

    Ok, it has both types of output and you have access to an open-collector which you can use to connect to another (external) relay - this would probably be easier than using a transistor as a switch however since you WANT to use a transistor.... yes, a series resistor will be required in the...
  12. kellys_eye

    Using PNP or NPN Transistor as a switch

    Your +ve supply should connect to the COM terminal of R1 Your -ve supply should connect to the COM terminal of R2 You can interconnect terminals to increase the current handling capacity of the relay contacts however this assumes that your pump requires more than 10A. Given your power supply...
  13. kellys_eye

    Carpenters mistake

    I suggest you remove the solder blob from the terminals as per the pic....
  14. kellys_eye

    Using PNP or NPN Transistor as a switch

    Which model wifi switch are you using? There are many under the name Sonoff.
  15. kellys_eye

    Replace power MOSFET in subwoofer plate amp, Sledge STA-1000D

    No reason why you shouldn't power up and make relevant tests and measurements. You seem to have all the bases covered as far as safety is concerned. If you can 'scope the signals that we 'think' may be driving the MOSFETs then so much the better!
  16. kellys_eye

    Using PNP or NPN Transistor as a switch

    Sorry, your description reads as 'gobbleygook' to me. Can you draw a diagram with all the parts as you have and have connected?
  17. kellys_eye

    Carpenters mistake

    Doesn't matter - either way will work and be perfectly safe.
  18. kellys_eye

    4G/5G etc

    We investigated a satellite feed - same problem, eye-wateringly expensive. Our location is all hills, mountains and lochs so line-of-sight connections are pretty much useless which is also why I suspected the new mast would have a fibre connection.
  19. kellys_eye

    Single Phase Motor Test

    yes. As above. Buy cheap, buy twice.
  20. kellys_eye

    Taking Garmin Nuvi camping...

    The battery for the Nuvi 2797LMT is rated at 5.5 watt-hours and assuming the battery you currently have fitted is in GOOD WORKING ORDER it calculates at a power consumption of 1.5A/hr <edit> just noticed that even Garmin state battery life to be only 1 hour..... imho that's reason enough to...
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