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  1. Hero999

    Lithium-ion batteires

    What do you mean by this? Please provide more information.
  2. Hero999

    Reversing switches

    Thanks for posting your circuit. Just a few suggestions: Why use relays? Surely it'd be better to use DPST switches instead. Maybe if it's a large motor relays are the best way to go but in this case it's a small motor so could be switched directly. You could then use normally closed limit...
  3. Hero999

    Deer Feeder timer

    Why no tbuy one if you've got no idea of how to make one? Electrically speaking, this isn't a very complicated project. It's the mechanical part which is probably the hardest.
  4. Hero999

    Reversing switches

    I suggested using a latching push-button so that wouldn't happen. A non-latching push-button would be no good here because the curtains would draw when it's pressed and open as soon as it's released or vice versa, if it's wired the other way round. No, to do that you need two SPDT push-button...
  5. Hero999

    Traffic Light Controller

    It sounds pretty straightforward, what part are you having problems with? I would consider replacing the lamps with LEDs because they use less power, can be run off a safe/lower DC voltage, last for longer than incandescent lamps (especially when flashed) and turn on/off instantly. I wouldn't...
  6. Hero999

    Reversing switches

    On second thoughts this is easy with switch/relay logic. The motor can be reversed by exchanging the positive and negative connections. The simplest way to do this is with a DPDT switch. Normally closed limit switches can be used to disable the forward/reverse direction appropriately, so when...
  7. Hero999

    Reversing switches

    If it's that easy than why haven't you figured it out for yourself yet? I don't know how you can do it because you haven't provided enough information. What kind you motor are you using: DC, AC shaded pole/synchronous? What components do you have at your disposal? This requires a state...
  8. Hero999

    IP WEBCAM battery pack @ build needed 5v 2a?

    http://uk.farnell.com/emerson-network-power/da12-050eu-m/psu-plug-top-5v-12w-eu/dp/1886221 http://uk.rs-online.com/web/p/external-power-supplies/7210914/...
  9. Hero999

    4 rechargeable AA batteries to standard USB power line

    My advice would be to use six batteries in series and a switch mode buck regulator to reduce the voltage to 5V. If you don't have room for more batteries then use AAA cells instead but bear in mind the capacity will be lower. A SEPIC converter can generate 5V from 4V to 6V but it's a bit harder...
  10. Hero999

    4 rechargeable AA batteries to standard USB power line

    You need a voltage regulator to convert the 4V to 6V from the batteries to a stable 5V supply for the USB devices. I seriously doubt the batteries you've bought are really 3800mAh, they're probably more like 1000mAh.
  11. Hero999

    ESR Meter project Puzzling Measurment

    Yes you did miss the mark by not providing enough information: schematic, PCB layout, pictures etc. - we're electronic engineers not mind readers.
  12. Hero999

    Electronic circuits software

    LTSpice will run on Linux under WINE. There are also many open source alternatives available, try searching the Ubuntu software repository.
  13. Hero999

    ESR Meter project Puzzling Measurment

    How are we supposed to know?
  14. Hero999

    mechanical volume control for computer sound

    I mean a 20 to 50 Ohm potentiometer. It really isn't critical, there doesn't need to be any impedance matching. The potentiometer just needs to have a low enough resistance to avoid being loaded too much by the headphones but high enough not to overload the sound card. If the resistance is too...
  15. Hero999

    Identify a capacitor

    Tolerance is normally specified as +/-20% or more typically -20/+80% for such a capacitor. If it has a tolerance of 10% then that's too good to be true for an aluminium electrolytic capacitor.
  16. Hero999

    Identify a capacitor

    Yes, it's a standard aluminium capacitor.
  17. Hero999

    Blank screen when I try to reply

    I recall having a similar problem with some threads. Have you sent mixos and email or private message?
  18. Hero999

    TESTING A 40673 DUAL GATE MOSFET

    Firstly, measure the resistance between both gates (connect them together) and drain and source, the resistance should be near infinite, >100M. Secondly connect both of the gates to the drain. Measure the resistance between the drain (meter positive) and the source meter negative), it should...
  19. Hero999

    TESTING A 40673 DUAL GATE MOSFET

    It's a depletion MOSFET. It's normally on (low resistance between the drain and source) when the gate voltage is zero. When the voltage on the gates is negative with respect to the source, there will be a high resistance between the drain and source. The resistance between the gates and...
  20. Hero999

    mechanical volume control for computer sound

    It's not too critical. Just use 20R to 50R and it should be fine.
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