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  1. Robert_fay

    Please Help To Identify

    Does your life saver look like an inductor?
  2. Robert_fay

    A/C Adapter Help Please

    I wrote up a little thing on this for my work and most are either a 2.1x5.5 or a 2.5x5.5 barrel plugs and if you have a ball point pen you can usually tell which is which as it will fit inside the 2.5 and it will not go completely in the 2.1. Works with almost all ball point pens...
  3. Robert_fay

    Help finding a switch

    I think I would need more information to help find a switch. How do you want to mount this switch. When you say 3mm is that a 3x3x3mm max overall size? What are you powering/controlling?
  4. Robert_fay

    Interfacing APR33a3 & GSM808

    Here is a write-up someone did on it. https://www.quora.com/How-do-you-interface-aPR33A3-with-Arduino
  5. Robert_fay

    LED getting hot

    The wall wart does not seem that hot to me. Have you used the power pack prior to this to see what kind of temps it normally runs at?
  6. Robert_fay

    LED getting hot

    Something wrong here. I agree. Is 250V an input? Better yet do you have a pic of the tag?
  7. Robert_fay

    LED getting hot

    Since you are using half of the max output you should not be having heat issues. This would lead me to believe that there is something else wrong either with the supply or the circuit if it is getting hot.Warm would not not be considered bad as almost all wall warts will get warm changing AC to DC.
  8. Robert_fay

    LED getting hot

    What are the specifications on the wall transformer. You are pulling some pretty good power out of a wall wart. I think I calculated about 9W.
  9. Robert_fay

    PCs blowing up

    Have you tested the outlet that you are plugging into? If they are frying that fast you either have a dead short in your PCs or a voltage issue in your outlet.
  10. Robert_fay

    Circuits to build for a beginner!

    Grob's Basic Electronics by Mitchel E. Schultz is one I like to reference.
  11. Robert_fay

    Please Help replacing 2 power adapters with 1 battery or power bank.

    Depending on what all you want to use it for. pi actually recommends a supply that will do 2A for full functionality. If you are not using it to power anything just to control the screen you can probably get by with much, much less.
  12. Robert_fay

    Please Help replacing 2 power adapters with 1 battery or power bank.

    This may be a bit much but here is a power supply that will do 12v up to 7A and 5V at up to 3A. https://www.digikey.com/short/30w824
  13. Robert_fay

    Suitable 3.3V voltage regulator(charge pump) for Lipo battery?

    It looks like Digi-Key has a reference design library. Might be a good one to check out. A little different application but might give you some ideas. https://www.digikey.com/reference-designs/en/lighting/led-drivers-ac-offline/47
  14. Robert_fay

    Best/safest way to use car radio as a garage radio

    If you are building an enclosure you could always use an external power supply. Look at these. https://www.digikey.com/short/30pbmm
  15. Robert_fay

    Best/safest way to use car radio as a garage radio

    You can find them many places. Here is a link to some I found at Digi-Key for example. You would just need to know the current that you need to run your radio. https://www.digikey.com/short/30p9nw
  16. Robert_fay

    Ambient Temperature Sensor (Thermistor)

    The only way you would be able to do this would be to test the reading at certain temps and if the readings are linear you may be able to figure out what value to add to adjust.
  17. Robert_fay

    Substitute for ACS08, a Triac I think?

    I believe the part number you have is ACS108-5SA-AP (Obsolete). Digi-Key lists a replacement for this part of 497-12437-1-ND (ACS108-6SA-AP) https://www.digikey.com/product-detail/en/stmicroelectronics/ACS108-6SA-AP/497-12437-1-ND/2864607
  18. Robert_fay

    db25 to usb

    Is it a smart cable like this you are looking for? https://www.digikey.com/product-detail/en/assmann-wsw-components/DA-70119/AE1324-ND/555190
  19. Robert_fay

    How fragile are diodes? Can you screw them up soldering them?

    Looking at the circuit there is a good chance that you are not reading through the diode and instead are reading through the circuit and that is what you are getting your readings. The section below looks like you would just read through the opposite diode.
  20. Robert_fay

    SMPS inverter common problem

    If it is happening on multiple different power supplies then it sounds like something is being hooked up wrong. Do you have any pictures of how you have it wired and what is "blowing up"?
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