Search results

  1. B

    How to calculate my battery bank Ah ,kw and Kwh

    As I see it from your explanation, there would be no parallel connection. They would all be in series to obtain 48V (24 cells @ 2V a piece) So Ah would be 165Ah. On the other hand if you do indeed have 4 strings of 12v cells in parallel, then you still only have 12v all-be-it at 4 x 165 or...
  2. B

    Power switch Identification

    https://www.jaycar.com.au/switch-push-bedlamp-dpst-240vac-3a/p/SP0738 Now discontinued...................... Try RS ...saw them in there somewhere....similar, not exactly physically the same. Switching is though.
  3. B

    what kind of switch do I need

    As before, please supply circuit diagram of what you have and proposed changes.
  4. B

    Building a manually-controlled touch screen tapper for controlling farm tractor GPS

    I'd be getting in touch with the manufacturers as they may have some ability to serial link either through hardwired or wireless.
  5. B

    confused about full bridge rectifier

    Label shows tappings 1 and 5 for 240v ac input. If you are inputting 220v as you say, then you need to change the tappings to suit otherwise output will be different from your expected 24. Possibly not a big deal but just noted. Coil resistance just as any other resistance can be measured with...
  6. B

    what kind of switch do I need

    What input voltage, what output voltages/current, supply circuit diagram, Common approach would be to use 2 regulators, not going to break the bank.
  7. B

    NEED HELP old RC speed controller only works one direction

    Seems plain English to me. Here is a typical off the shelf unit that should do the job. https://www.ebay.com.au/itm/153958888763 You have an on off switch, a battery input, an rc signal input and a red and black wire to your brushed 550 motor. Doesn't come much simpler than that. Just check...
  8. B

    confused about full bridge rectifier

    Doesn't show that in the drawing.
  9. B

    confused about full bridge rectifier

    Yup....looked at wrong bit of the spec sheet. :rolleyes:
  10. B

    NEED HELP old RC speed controller only works one direction

    As I said above, (or did you not read my reply...??) you need to know the current draw of the motor. If it's a competition motor it may well be up around the 30A mark but if a standard hobby back yard type then maybe less at around 15A. It depends on the winding turns your motor has. Wouldn't...
  11. B

    NEED HELP old RC speed controller only works one direction

    Rubbish...there are plenty of brush type speed controllers out there for around the $20.00 mark with forward and reverse capability, even brake option. You will need to know what size (current) Those old cars usually ran a 540 size motor around 90w from a 7.2v nicad supply. I converted one here...
  12. B

    confused about full bridge rectifier

    Assuming 30 volt is the AC input, circuit layout looks correct. 1N4007 diode is 1Amp maximum and will withstand 50v peak voltage. You are getting very close to your peak rating.(approx 42V) Is there some reason you need 30V AC ...??? You have no detail on the current that the coil draws. If that...
  13. B

    How would you go about testing this port without its adapter?

    Marking is on the casing as to which is which only the photo the Op provided is too blurry to make out polarity/ ac or dc as I quoted earlier.
  14. B

    ECG EKG sensor protection - diodes

    Notch filter perhaps.
  15. B

    How would you go about testing this port without its adapter?

    Test for what...it's a power input....
  16. B

    How would you go about testing this port without its adapter?

    Photo blurry but requires an input of 18.5v @ 2A....whether ac or dc is not clear....it shows which goes to which pin but as I said.blurry. Measure inner pin diameter for correct size....usually use vernier caliper
  17. B

    LEDs & Hall Effect Switch Circuit Advice Please!

    Button cells next to useless ,not enough capacity. Workout resistor value from ohms law. Hall effect I think you intend to use may not work as you think. Size of magnet would depend on distance from the hall effect, specs will show it. Wire size depends on the length of cable run and the current...
  18. B

    High power, low capacity UPS circuit

    Yes well, debatable just who is not listening here...might have to bring out my favourite " I know boats, Norm video" once again but I fear that would go unabsorbed as well. Good luck once again.....
  19. B

    High power, low capacity UPS circuit

    Good luck with that....
  20. B

    Tachometer

    Don't know why you don't simply do some study....the necessary link was provided earlier.
Top