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  1. kellys_eye

    Automotive Bluetooth Controller

    In which case any cheap Android-based mini tablet would do the job - most of which have Bluetooth, wi-fi etc etc integral. You should eb able to program it to 'boot' into the application you want to use or put a number of different apps on the main boot screen to allow user selection accordingly.
  2. kellys_eye

    PUPS Problems with Uninterruptible Power Supply

    Your link shows no details for the PSU output - however a typical ATX PSU can range from 300W to 800W - some graphics cards increase individual output requirements considerably. If you design your system to allow for every eventuality you will - as already mentioned - require the 'largest...
  3. kellys_eye

    Ultrasonic detector connections

    One may have a common connection to the two transducers - the other may have individual connections (i.e. 2 per sensor).
  4. kellys_eye

    LCD display disappears

    What is the TOTAL current consumption of all the devices and circuits?
  5. kellys_eye

    Is this something fixable?

    0.47μF 160V to me..... but some other checks to establish the full extent of the damage (burned board?) and maybe WHY it blew up in such a spectacular fashion? The components look to be part of the snubber circuit (across the speaker output).
  6. kellys_eye

    Basic Electronics Q.

    Your arrangement was described thus: B1 - B2 - B3 - B4 B5 - B6 - B7 - B8 There are two 'legs' (B1 to B4) and (B5 to B8) i.e. B1 to B4 are in series therefore their battery voltages ADD (6V) B5 to B8 are also in series (6V)
  7. kellys_eye

    LCD display disappears

    If your PSU is under-rated then putting in smoothing/decoupling capacitors won't fix the issue. Your PSU should have details on it somewhere but you didn't add a picture (as your post said) so I'm clueless.....
  8. kellys_eye

    Basic Electronics Q.

    No, the total voltage will be the sum of the individual 'legs' therefore 4 x 1.5V (twice). Each leg is therefore 6V If each cell was rated at 1Ahr then each 'leg' would be 6V and 1Ahr but two legs in parallel would be 6V 2Ahr. Voltages in series add (but recall you have some in parallel too)...
  9. kellys_eye

    Hello from Beautiful Greenfield Indiana!

    Kudos for posting a face picture! I'm a UK-based G4*** licence holder (full) and happy to see another operator joining the fold. Welcome.
  10. kellys_eye

    Identifying a chip

    Just a chance.... try wetting the surface of the IC's and see if it reveals any of the codes on them. It's sometime possible to decipher them this way. Another method is to use a very fine wipe of heatsink compound (the white stuff). Worth trying to see if anything shows.
  11. kellys_eye

    Momantary, non stopping rotary switch

    You seem to want a rotary encoder. These come in many versions that have x-number of steps per revolution. They output a pulse per step...
  12. kellys_eye

    Cleaning Soldering Iron Tips

    Oh no, no, no....:confused: you shouldn't use that stuff, it's far too corrosive. Use flux-cored solder and, if necessary, a flux pen or IPA-type for additional flux.
  13. kellys_eye

    MOSFET Circuit Help

    If you have a barometer in a closed case with a fan blowing - or sucking - air into/out of that case you WILL HAVE A PRESSURE DROP/RISE when the fan is working. Either you have misinformed us of the situation or you don't understand how a barometer works.
  14. kellys_eye

    Automotive Bluetooth Controller

    What accessories? In a true automotive environment you should consider using the propriety communications protocol which is usually CANBUS - can your devices operate (or are there equivalences that do) using this protocol? What you request is perfectly feasible but sounds like it will require...
  15. kellys_eye

    LED schematic diagram

    This, I've got to see.......
  16. kellys_eye

    Cleaning Soldering Iron Tips

    Most soldering iron tips are 'coated' (electroplated) to prevent (well, reduce) wear from the corrosive flux used. Sanding a tip and breaking this plating will result in really fast tip wear. Personally I clean the tip on a sponge (wet) whilst in use and use the wire wool if it gets 'crudded...
  17. kellys_eye

    How to run BLDC motor from an old printer

    The motor is 'like' a 3-phase motor, the windings are visible as U,V and W. See this datasheet for all the dirt on how they work and how they are driven: http://ww1.microchip.com/downloads/en/appnotes/00857a.pdf They can be driven 'simply' using discrete electronics or controlled accurately...
  18. kellys_eye

    LCD display disappears

    You don't show the actual 5V power supply. What is its rating? You really should add smoothing and decoupling capacitors on the power distribution board. Put a 1000μF in parallel with a 100nF capacitor on the 5V/GND board that the power is being distributed from.
  19. kellys_eye

    Identifying a chip

    That raises another issue - they would only socket the chip if it was known to be subject to failure (easy replacement). The solder on the reverse of the board for that socket looks to be original therefore the socket isn't an 'add-on' someone chucked in at a later date - it was there by...
  20. kellys_eye

    Can I fix this old Pioneer SR303 Reverb myself?

    Measure the voltages across R118 and R119 respectively and with respect to the chassis.
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