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  1. KTW

    Temperature sensor

    Hi Chris; Let me say thanks for the effort you put into this. This is for a vehicle emissions leak test when the engine light comes on and tells you there is a small or large leak in the system. I'm chasing down a small leak in my wife's jeep. I plan on using the original nt probe for my...
  2. KTW

    Cheap Motion sensors , chinese I think

    If you had taken my suggestion, this is what you would have. This is a 50k trim pot adjusted to 2.2k and bridged to R14. 20k bridged to R14 will buy you 35 seconds.
  3. KTW

    Temperature sensor

    I just wrote to ask if it was ntc or ptc. Thanks for taking the time to find that, I did search earlier and couldn't locate one similar.
  4. KTW

    Temperature sensor

    Here Chris, couple from each end.
  5. KTW

    Cheap Motion sensors , chinese I think

    You appear to be out of options so try a 2.2k resistor parallel to R14 to change the timing. [mod note ... bad comment deleted]
  6. KTW

    Temperature sensor

    Hi Chris, it melts pretty quick.
  7. KTW

    Temperature sensor

    Not sure Chris, I contacted the seller but I'm doubtful if they would know. We'll see.
  8. KTW

    Temperature sensor

    Hi Chris, thanks for your input. The probe that comes with the unit can sense temperature up to 110o C. The element I'm using gets to 85oC so I'm ok temperature wise but the conductors are plastic insulated and that's why I was looking for a probe with higher temperature insulation. What do you...
  9. KTW

    Temperature sensor

    No typo, 105 ohms ambient temperature.
  10. KTW

    Temperature sensor

    I discovered the problem, two different sensors. NTC thermistors decrease in resistance as the temperature increases. PTC thermistors are Positive Temperature Coefficient resistors generally made of polycrystalline ceramic materials that have a high positive temperature coefficient, which...
  11. KTW

    Temperature sensor

    I was just checking the resistance and comparing the two and I find that the original is 12.5k at ambient and when heat is applied it changes to 8.0k and the numbers continue to drop. The new probe is at .10k and the numbers change to .20k and continue to rise. The original can change with body...
  12. KTW

    Temperature sensor

    I've made an emissions system smoker and the temperature control didn't come with a heat resistant probe so I purchased one but it didn't match the original probe. I added 10.5k resistors to match the ambient temperature of the original but it is stuck on 23.5oC. Does anyone know if I can get...
  13. KTW

    Help:Locating break in electric cable

    Search for opens tester.
  14. KTW

    Cheap Motion sensors , chinese I think

    The trim pot should be a 204, 200k.
  15. KTW

    Cheap Motion sensors , chinese I think

    What's the value of RV1?
  16. KTW

    Cheap Motion sensors , chinese I think

    It sets the delay time.
  17. KTW

    Cheap Motion sensors , chinese I think

    I have the same device and it will shut down after 1 minute and twenty seconds.
  18. KTW

    Car Battery/Car Alarm/Capacitor Question

    Get a load test done on the battery.
  19. KTW

    Wanted: Wireless led signal system

    Drew, you can use a DC 12 volt 10A relay wireless RF remote control switch transmitter + receiver. The 10 amp relay can supply power to a light. The transmitter is the size of a key fob.
  20. KTW

    Car Battery/Car Alarm/Capacitor Question

    Check the current draw from the alarm and compare it to the specs.
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