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  1. kellys_eye

    Soil moisture sensor

    I recall seeing soil moisture sensors as part of Arduino-like kits - they offer this assurance... At $4.95, certainly worth a punt....https://www.sparkfun.com/products/13322
  2. kellys_eye

    Need assistance identifying this component

    Looks like a simple insulated connecting post to me. It's unlikely to be the cause of fuse failure. Check the main bridge rectifier, the smoothing capacitor(s) and the main switching transistor (< the usual suspect). Can you show a picture of where it came from? It just appears to have...
  3. kellys_eye

    Mini Cameras

    You're asking a lot.... most would just dump them and get working items as they are very highly integrated i.e. unless the damage is physical then the potential for internal (IC or camera module) damage is high and not repairable anyway.
  4. kellys_eye

    Power-One power supply mod

    120VA??? Two secondary windings at 28V gives you around 1A per winding (no idea what S3 is but it can only DECREASE the available current for S1 and S2). If you only want a PSU with limited current output then that's fine but for the original design (3A?) that transformer won't meet the needs.
  5. kellys_eye

    Winding 4 Axis CPU BLDC Motor Stator

    Copy the existing winding arrangement or, as most others would do, fit another fan.
  6. kellys_eye

    Looking for Guidance

    You're approaching this from too 'deep' into the electronics. Instead of looking at the signals post-processing (PIC output) you need to be looking at the way the error (lamp detection) is done - according to the manual these are 'bi-metal', 'suction temperature' and 'exhaust temperature'...
  7. kellys_eye

    SPICE alive

    What's spice? Is that another name for coke? If it is then.... HELL YEAH Bro!
  8. kellys_eye

    Light my lamps please!

    If they were LED the batteries would last a lot longer in the first place.
  9. kellys_eye

    Question about transistor

    D'oh. As much as I read your posts I read OVER the use of 'definitions'..... trying to keep it too simple. I take your point.
  10. kellys_eye

    Need help finding replacement transformer for oven control board

    Darlington and op-amp on that board, yes, but the ribbon cable links to another board with circuitry to drive a 7-segment display array so there will be 5V somewhere..... perhaps? Would need to see the component side of the second board to verify.
  11. kellys_eye

    Huntron Tracker 2000

    LOL
  12. kellys_eye

    Looking for Guidance

    According to crazifunguy...
  13. kellys_eye

    Question about transistor

    The same 'result' occurs whether you apply a fixed or an alternating (variations) signal so your original statement.... is wrong.
  14. kellys_eye

    Old cctv camera repair

    At $33 for a replacement is it really worth repairing? http://knoppix.net/store/Magnavox-Mc3511-Al02-Observation-Camera-Mc3511al02_121483171593.html
  15. kellys_eye

    Need help finding replacement transformer for oven control board

    The secondary consists of two separate windings, potentially 0-9 and 0-9 (or, as they are wired 9-0-9). The use of 9V means as a simple rectified-to-DC output it provides the 12V for the relay operation bt the other 9V isn't too high as to make too much demand on a 5V regulator (dissipation -...
  16. kellys_eye

    Question about transistor

    ??? a fixed base current (in a BJT) results in a fixed but AMPLIFIED current in the c-e circuit.
  17. kellys_eye

    Need help finding replacement transformer for oven control board

    If it was possible to determine the secondary voltages you could purchase many small transformers that could bold to the board and be wired into position. It would even be possible to mount a transformer off-board somewhere (safe) and take flying leads to the secondary connection points. One...
  18. kellys_eye

    Huntron Tracker 2000

    Value? Whatever anyone who has a use for it would be willing to pay. Personally I'd give you $10 for it - and scrap it for the parts. Very limited use, very restricted market, useless for 99.999% of amateur use. You'd be VERY hard pressed to find a buyer. One of those pieces of kit that the...
  19. kellys_eye

    Bi-directional Motor with speed control circuit

    Use an 'h-bridge' arrangement and apply the speed controlling signal to the appropriate motor-controlled pair of transistors.
  20. kellys_eye

    300 V DC Power Supply

    Read the article - the transformer is hand wound but not many turns so easily made and the core can be 'practically' any ferrite material.
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