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  1. dave9

    Does anyone know the name of this AC power cord adaptor?

    There is no proper name per se, it's just a connector. The manufacturer could have chosen among many styles. Are you trying to find a source to buy more of them or the mating socket for it? If all else fails, sometimes you have to settle for buying both a new plug and socket so you have a...
  2. dave9

    ws2812b ledstrip as motorcycle indicator

    First, what are you trying to do with these parts, indicate what and some sequence or different colors or? I don't understand why you need a microcontroller and LED controller, if there is a simple more efficient and lower cost solution that does away with a linear 5V regulator to power LEDs...
  3. dave9

    Temp sensor and PWM for 12v fan-2 wire or 4 wire?

    Don't think you really need a variable speed control, just to have sufficient airflow and have it come on and turn off at set trip points. There are a few thermostat modules on eBay and elsewhere, around $2 and up depending on how fancy you want them to be. Example...
  4. dave9

    Can't find CR2032 3V rechargeables, safe to use 3.6V LIR2032?

    Don't see the point, you can get a 50 pack of CR2032 on eBay and elsewhere for under $10. They have a long shelf life and this low self discharge means they'll run a typical device using them for several years. Rechargeables, you'll probably end up having to recharge them every year or two and...
  5. dave9

    Help with power supply

    Need more info about this project, purpose, weight/size/budget, frequency of use, link to monitor, etc, etc. There are too many variable to make a good guess but if I were to guess, it would be use an 18V Li-Ion power tool battery pack, so it is convenient to recharge and some have a built-in...
  6. dave9

    Got any ideas for using an old fridge?

    I'm doubting it is worth much for metal recycling in the US, where you can buy a used working refrigerator for under $200, but yes that would be better than just letting it sit in a landfill, except that through disassembly you are letting the refrigerant out which is illegal in the US "as far...
  7. dave9

    Have blind cat - need someone to build plug in device

    Smoke detector with a low battery? :D Then again I don't know about cat hearing but for humans, a mid frequency is easier to use for navigation purposes.
  8. dave9

    Got any ideas for using an old fridge?

    Server rack? Bomb disposal? Giant subwoofer? Sensory Deprivation Chamber? Electrolytic derusting/plating/etc tub? Secret entrance into the hidden room? Put in shelves and a fan, for audio-video cabinet? Exercise sled dog by pulling fridge around the yard? Paint/etc booth with fume extractor to...
  9. dave9

    Electronic Relay

    There is no reason why this wire that failed is particularly prone to failing. I think the repair was done poorly. Any wire under the hood is going to be exposed to as much heat, some even more across the top of the engine, but if it were a special application where it was needed, you could...
  10. dave9

    need component detail

    There is something wrong with it or ??
  11. dave9

    Electronic Relay

    I am not following why you don't just repair the wire and if the prior repair failed, do the repair better than the last time? Buying a piece of wire, heatshrink tubing, even a $5 soldering iron with solder and wire cutters too is not very expensive. Was it not routed through a safe location...
  12. dave9

    Rhino air hockey

    I don't know any sources for air hockey replacement parts except the manufacturer or ebay. You might see if there are local dealers who sell such things and ask them or a referral to a repairman. The key thing in my mind is to first determine if it is even the board or instead the power supply...
  13. dave9

    Casio WK3800 keyboard won't switch on

    Appears to use an external 12VDC, 1.5A or higher adapter, or 6 D cell batteries. See if you can borrow the power adapter from your friend if you don't have one suitable or try 6 x D cells. Did it ever work while in your possession or did you buy it without testing it worked? Did the seller...
  14. dave9

    JVC RX-450 silent

    Probably a power surge fried the rectifier diode(s) right after the transformer, or the output transistor(s) right before the output terminals, on the large heatsink. If there's only one bridge rectifier circuit for both the audio and the logic and display, then it's probably not the diodes.
  15. dave9

    Appropriate power supply for 3 LEDs

    It seems like the bottom line is that you need to be active in setting this up to measure current before finishing it in place, and if the current is too high or low, adjust the resistor value accordingly. I would go with a driver if it were 1W or higher LEDs, and might even abandon the idea of...
  16. dave9

    Appropriate power supply for 3 LEDs

    ^ No that would be 3 parallel strands with one LED and 100 ohm resistor on each. They will only draw the amount of current set by the drop across the resistors. You merely need a PSU capable of a little margin over 60mA (3 * 20mA) which in this case is any/all of them. Since I have a few...
  17. dave9

    Rechargeable LED pairs - how do these work?

    ^ A better picture would help but I am assuming these are the plastic encapsulated type LEDs rather than a stacked surface mount package where there could be a large leakage path. I mean if the only path is a bond wire that should fry open circuit if all current passes through it, and if it...
  18. dave9

    Rechargeable LED pairs - how do these work?

    Okay, so it's running from 3 x AA = 4.5V at most, so shouldn't have any series of LEDs, all in parallel. If it was driving the LEDs too hot, it is definitely possible to blow them, but normally what would happen is those with the lowest (will vary slightly from one specimen to the next LED)...
  19. dave9

    Rechargeable LED pairs - how do these work?

    It might help to start with a complete description of the lantern including model name, possibly links if it is still sold online, what type and voltage battery, better pictures and more - any and all data about it. 5V might be a bad test... there are no 5V batteries so that is not the correct...
  20. dave9

    Rhino air hockey

    It is a simple DC voltage measurement with a multimeter. As far as the LED board goes, it might be repairable, could be something as simple as the power input socket having a cracked solder joint that needs resoldered or otherwise fixed in place then a jumper wire used to complete the circuit.
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