Search results

  1. dave9

    USB Power Supply Contacts

    5 pin micro-B uses pin 1 for 5VDC (aka VCC) and pin 5 for ground, but I suspect that you have your pins numbered backwards and what you show as pin 1 is really pin 5 and vice-versa. Either way, those two pins are what you need. This is standard for USB, to have power and ground at opposite...
  2. dave9

    Question slot card SD in devices

    Yes. Everything must be stripped down to discrete component level. Screws removed, components desoldered, batteries separated into their constituent chemicals. Each component must be stored in its own air tight container, packed with mountains of silica gel, and deposited in the deepest ocean...
  3. dave9

    To Short or not to Short- that is the question

    No, if connected together there is a round dot joining them.
  4. dave9

    Questions DVD disc media

    Again, if it is that damaging to discs, you need to protect yourself first. Post a pic of yourself sealed in an air-tight container, otherwise we are just distracting and delaying you from taking this necessary step for your protection. A saner person would just insist that damaging vapors not...
  5. dave9

    Questions DVD disc media

    Another ridiculous topic. If these were present in the air in that significant a concentration, you'd be in the hospital already from lung damage, with no concerns about how long your old DVDs will last because they will still outlast you. SO, clearly you are more important than DVDs, so I...
  6. dave9

    Questions conserve game console

    The best thing to do is to move to earth, where we can keep our electronics out in the open and they don't implode.
  7. dave9

    Questions conserve game console

    It seems like you are going about this all wrong. How are you going to store mountains of silica gel long term? If you already have that ultra low humidity environment, just put everything in it, then you don't need the silica gel.
  8. dave9

    Questions conserve game console

    3 sachets of silica gel absorbs ALL the days... forever, or until you open the sealed air-tight container. Encasing it in concrete and placing it in the deepest ocean trench, should help to deter you from opening it very often. Keep in mind that Li-Ion batteries have a shelf life. There is...
  9. dave9

    How to clean oxidized USB plug?

    How did it happen? Prevention seems important. A mildly abrasive metal polish should do the trick, for example brasso (but I would try toothpaste first if you have no metal polish), but that is just a ground (and not strictly needed for USB function since there is another pin 4 ground on the...
  10. dave9

    LI-ION 18v Battery Pack

    Did you mean to write "it may be that I bought a BAD BMS" ? It might help if you link to that BMS board. I'd assume P+/- is power input, but it should have contacts to go between the series of cells to sense individual cell voltage, otherwise you could discharge a weak individual cell too...
  11. dave9

    solder paste and flux

    They go in a machine. Without that, people have been 3D printing some, you can search plans for 3D flux dispenser if you have that inclination. Otherwise, since that seems to be a rosin based flux, I'd empty the contents out by pulling the plunger out of the back or cutting the syringe open...
  12. dave9

    Power supply downgrade

    ^ Then is it putting pairs of cells in parallel, how did you arrive at 6V as the target?
  13. dave9

    Power supply downgrade

    If it is meant to use 4 x alkaline batteries and that is how you arrived at 6V, odds are very good that it would work at 5V. However, there may be something you can do, depending on the design of the PSU. If it's a switcher and has just a fast silicon diode after the transformer, you could...
  14. dave9

    How can I use PWM to control a Solenoid Valve through a PLC?

    You might want to mention and link to the specific parts. Odds are that the valve has a suggested PWM driver for it and a datasheet for that with instructions to aid in implementation.
  15. dave9

    Can you identify this part?

    ^ I couldn't tell from the pic if it was plastic or not, was thinking maybe 0 ohm resistor-as-cheap-fuse.
  16. dave9

    Can you identify this part?

    It might have helped more if you had full pics of the front and rear of the board, well lit, 90' angle, and had traced a bit of the circuit to/from that point. It's looking pretty (flux?) crusty and excess solder in the pic, have you already been soldering it or someone else prior to your...
  17. dave9

    Wire

    I don't use wire on perfboard much but when I do, I usually use solid network cable wire because I have salvaged a lot of it. Of course it is going to oxidize long term and the gauge can't carry much current but neither if these things bother me much if doing a quick 'n dirty perfboard build...
  18. dave9

    Blow fuse

    Your ability to solve this is directly related to the effort you put forth. So far, it doesn't seem like you are going to fix this.
  19. dave9

    Identifying Microphone Location

    Look at the board with the white ring around the perimeter where the LEDs (DS1, DS2, DS3, etc) are. In between them are several (6) golden colored rectangular metal mics labeled as MK1 through MK6 around that white silkscreen area and then the 7th mic, MK7 being in the center of the board. So...
  20. dave9

    DC Voltage Control from Solar Panel for direct usage

    It is unlikely that your panel can directly power the motor, 6A short circuit probably isn't 4A at 12V. Thus, your best bet is charge a 12V battery with it. There are many solar battery chargers out there. If you needed to power the motor continuously then you simply need more solar panel(s)...
Top