Search results

Search Forums New Posts
  1. Alec_t

    Can I attach a water pump (12v) to raspberry pi (3v)?

    Welcome to EP! Surely USB is 5V, not 12V? Can you post a link to the pump specification?
  2. Alec_t

    18650 charging

    That sounds about right (check out Battery University for the correct charging schedule), so the pulsing is likely overload protection.
  3. Alec_t

    Converting Action Figure/Toy with Leds from Button cell batteries to 5V usb wall plug help.

    Good point.
  4. Alec_t

    Regarding Battery charger IC

    Aren't the 3V cells Lithium Manganese Dioxide? You need to be sure of the chemistry. If you don't charge Lithium-based cells correctly you are likely to have a fire or explosion.
  5. Alec_t

    The 5A fuse directly blows when I plug in this board in.

    Welcome to EP! I'd start by checking the diodes inside the bridge rectifier to the right of F1. Look for any signs of overheating/scorching of any other component or the pcb. Check components mounted on heatsinks.
  6. Alec_t

    Regarding Battery charger IC

    Li-ion cells have a nominal voltage of 3.7V, so a 3S3P battery should provide a nominal 3 x 3.7V = 11.1V. Are you sure of your battery's voltage and chemistry?
  7. Alec_t

    Converting Action Figure/Toy with Leds from Button cell batteries to 5V usb wall plug help.

    Assuming a 20mA current draw, that everything at present is powered happily by those three cells in series and gets 4.5V with fresh cells, then it is unlikely that the toy would come to harm with a 5V USB supply instead. To be on the safe side you could insert a 1N400x diode (x is in the range...
  8. Alec_t

    Converting Action Figure/Toy with Leds from Button cell batteries to 5V usb wall plug help.

    If 3 x AAA give only 4.16V they are practically dead. 20mA or thereabouts is the typical working current of a common-or-garden LED Tricky to advise on probe placement when we have no idea what the toy or its internals look like ;).
  9. Alec_t

    Converting Action Figure/Toy with Leds from Button cell batteries to 5V usb wall plug help.

    If you mean put them in parallel, that will give them all the same voltage, hence all will need individual resistors or else they must be closely matched for forward voltage (Vf). Are they all the same colour?
  10. Alec_t

    Converting Action Figure/Toy with Leds from Button cell batteries to 5V usb wall plug help.

    Welcome to EP! The implication is that there are three 1.5V cells in series. Can you confirm? How much current does the toy draw (you will need to disconnect one battery terminal to check with a test meter)? Why, if you can't access the LEDs individually?
  11. Alec_t

    oven control board - melted wire connection

    Welcome to EP! I would guess a defective crimp of the connector terminal to the wire resulted in poor contact and hence heating of the terminal. The burnt section of board could pose a problem if it has carbonised and become conductive. You would have to remove any carbonised part, find a way...
  12. Alec_t

    Using Step-Up Boost Converter To Boost LITHIUM IRON PHOSPHATE BATTERY Battery To 12 Volts

    What input current does your inverter require? Allowing for boost converter inefficiencies, the battery pack will have to provide about five times that current. What is the rated maximum discharge current of the pack?
  13. Alec_t

    MOSFET not giving sufficient power

    You have no Vcc connection (3.3V, 5V?) from the micro to the module.
  14. Alec_t

    My PC doesn't turn on! even the fans don't spin!

    Welcome to EP! This is a long shot, but is that a coin cell in the bottom left of pic 2? If so and it's dead (or nearly so), that might be the culprit if it supplies something which the BIOS needs to get started.
  15. Alec_t

    2 mosfets switch

    So, 120GHz. That will be a challenge. :)
  16. Alec_t

    2 mosfets switch

    Google H-bridge and H-bridge driver circuits.
  17. Alec_t

    Induction wall socket/outlet to replace BS1362 standard ?

    That's one thing, but preventing a powerful transmitter from spewing EMI is a different ball game. A domestic power socket would have to be capable of handling several kilowatts, not a mere 30W.
  18. Alec_t

    Implementation of a chaotic circuit in LTspice

    It's only related in the sense that it produces a chaotic result. It implements the equation xn+1 = A xn(1-xn).
  19. Alec_t

    Induction wall socket/outlet to replace BS1362 standard ?

    A major problem with high power energy transmission would be EMI suppression in view of the way-less-than-perfect coupling between primary (transmitter) and secondary (receiver).
  20. Alec_t

    Implementation of a chaotic circuit in LTspice

    I couldn't get your ascs to give a prolonged chaotic output. Try the attached :
Top