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  1. Tha fios agaibh

    14.8v @ 16 amps down to 12v @ 8 amps

    It's likely your camera will be fine Your power supply as is. Yes, its better to have the voltage higher than exactly 12v. Unregulated power supplies will output a higher voltage than when hooked to the load of a circuit. For example a wall transformer may read 14.8v but will then drop to 12v...
  2. Tha fios agaibh

    14.8v @ 16 amps down to 12v @ 8 amps

    Or you could put about 4 silicon diodes in series that would drop it from 14.8 to 12v. Peak current is 8a, but you could probably get away with diodes or rectifiers rated 6a. Depending on your normal load. I'd just use a 8a limiting fuse for protection.
  3. Tha fios agaibh

    A Christmas Gift

    Monostable mode ne555 as Bob suggested. should be just over 9 seconds. For safety, I recommend a low voltage light over a 120v option if its a wet location.
  4. Tha fios agaibh

    help needed with electrical connection please

    It may mean that the control transformer is stepping down 240 to 120. If 240 is applied across L1 and L2 both windings of the transformer are used. Whereas if 120v is applied to L1 and N, only half of the primary windings are used. That would explain why the switch position doesn't matter if...
  5. Tha fios agaibh

    What is this?

    Very cool. It'd be interesting to see it on the tv schematic.
  6. Tha fios agaibh

    What is this?

    I think its a spark gap tube used to excite high voltage for the crt.
  7. Tha fios agaibh

    Help repairing fish tank led light

    Parallel. Yes.
  8. Tha fios agaibh

    Help repairing fish tank led light

    As I said, it's not wise to guess what a component might be. It's like asking the doctor; Should I take vitamin A, or C to cure my stomach ache? If you are insistent on proceeding with your wild guess, go with a higher value resistor.
  9. Tha fios agaibh

    Remote sensor on powerline

    Hop, thanks for the great explanation. I agree that if it can be purchased for ~$50 it's probably not really worth the trouble of building one. @Bluejets that circuit is awesome, I'm wondering if it will work on 60hz, or if its prone to false trips because it doesn't work at zero crossing as...
  10. Tha fios agaibh

    Remote sensor on powerline

    I'd like to hook up a remote sensor at end of my driveway to alert when someone arrives. It's very far away from the house; about 500ft or 150m, so naturally I don't want to run a cable out there. Second option would be to use a RF transmitter but they can be prone to interference and it'd have...
  11. Tha fios agaibh

    Help repairing fish tank led light

    Guessing is not wise. Do you really want to go through all the trouble of replacing parts only to have it fry? I can see a repeated tracer pattern, I just can't see the entire circuit from your pics.
  12. Tha fios agaibh

    Help repairing fish tank led light

    Have you done this? Again, if the circuit is known the resistor can easily be calculated. For instance I can see R2, L4,L5,L6 are all on one string and then connect to the common tracer on bottom of board. If this is sketched out, we will know how its wired. (3 leds in series with a R150...
  13. Tha fios agaibh

    Trailer lights and converters

    The two wires into one pin are likely running lights if one of them has a brown wire with it. (left and right tail lights)
  14. Tha fios agaibh

    Pellet Stove Motor will not run

    Yes, either way is fine, If in fact the cap is bad.
  15. Tha fios agaibh

    Pellet Stove Motor will not run

    A motor that has a failed start cap usually sits there making a humming noise and will then take off, if you can manually spin the motor shaft.
  16. Tha fios agaibh

    Pellet Stove Motor will not run

    Looks like its a start cap (two terminal), not a start/run cap (three terminal). And the rubber cap may come off to access the terminals on top of cap. So something like this should work. http://m.ebay.com/itm/271463062491?_mwBanner=1 I believe the stud is for mounting purposes only, Not as a...
  17. Tha fios agaibh

    Help repairing fish tank led light

    I looks to me it might be a 12v circuit; where each of the led has a forward voltage of 3v (times 3) and the 150 ohm resistor drops the other 3 volts. 3/150=.02 amp thrugh each group of 3. You'll need to do some detective work to find the missing resistor value. Does the light have low and high...
  18. Tha fios agaibh

    Help repairing fish tank led light

    Resistors that read R1500 are 150Ω. R270 are 27 ohms. Put your meter on ohms scale if its an autoranging meter, or 200 ohms range if manual. See what you get. Also see what voltages you get at the 3 wires. Always start on highest voltage range, then switch to lower range if needed.
  19. Tha fios agaibh

    Help repairing fish tank led light

    Their may be leds out because of the missing resistor. Flip the board over and follow the traces to see how the circuit is wired, then draw a circuit diagram so the resistor can be calculated provided the voltages and led specs are know. You can test resistors with your meter on ohms scale.
  20. Tha fios agaibh

    Help repairing fish tank led light

    Looks to me like the array is wired with a resistor limiting current on each bank of 3 leds which are in series. It could be a bad resistor or diode but I'd guess the leds got fried from rogue currents. If any one led is burned out it will keep the rest from lighting in that string. You could...
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