Recent content by dubya_80

  1. dubya_80

    SG (Specific Gravity) in Fluid

    The density of the water affects the buoyancy of the object.
  2. dubya_80

    Programmable polarity reversal circuit

    Have you considered using a pair of relays and a timer? I've used two 5 pin relays to reverse the direction of current successfully and i reckon it wouldn't be difficult to use some sort of timer to switch the relays.
  3. dubya_80

    Yet another writer in search of a catastrophe

    It occurs to me the alien could be from one of the universes that has already faded. . Knowing it's inevitable the same will happen in this universe unless the artifact can be used to somehow keep this universe attached to the wave? Coffee fueled btw
  4. dubya_80

    Variable speed control of multiple dc motors

    Well i just went by the info on the ad itself. I added a cooling fan to be safe and crossed my fingers! I got lucky with the 4 motors seeming to cancel each others electrical noise! I put the car on crates and when I put load on two wheels the other two just slowed to match and there was barely...
  5. dubya_80

    Variable speed control of multiple dc motors

    I guess I'll just test this unit in one direction and if it tests out ok just order a second one for reverse. .
  6. dubya_80

    Variable speed control of multiple dc motors

    it didn't come with any! all I have to go by is what's on the sellers Ebay page. none of the transistors or the IC have any markings either. I'm mounting it in a fan cooled box before I test it out.
  7. dubya_80

    Variable speed control of multiple dc motors

    My PWM module arrived today so i went about getting it ready to install and it's got a common +ve! So I'm off to rewire the relays to separate the circuits!
  8. dubya_80

    Variable speed control of multiple dc motors

    These are pics of the sort of motors and reduction gears I'm using I have removed the inductors and capacitors from the ones I installed, and now I am realising what they do! What sort of things should I consider using caps and inductors?
  9. dubya_80

    Variable speed control of multiple dc motors

    Quite possibly! The wheels that aren't on the ground will pinch all the power? Or is there other issues I'm not considering?
  10. dubya_80

    Variable speed control of multiple dc motors

    I'm on my way to work atm. The motor and reduction boxes I'm using are straight off a few kids electric cars . I can upload a picture this arvo, including an unassembled view, as i have spares
  11. dubya_80

    Variable speed control of multiple dc motors

    Ok that sounds lije something i should look at. Can I use inductors alone or would it need to be more complex?
  12. dubya_80

    Variable speed control of multiple dc motors

    The motors are matched pairs front and back. They all run the same speed under no load. Not sure but i hoped this setup might also act like a differential?
  13. dubya_80

    Variable speed control of multiple dc motors

    so you can see what I have done with the relays here is a circuit diagram I did crudely with Paint. This part at least works perfectly, just the pot wasn't useful to vary the supply. The PWM module claims 480W at 12V, I expect to peak around 300 or so.
  14. dubya_80

    Variable speed control of multiple dc motors

    Yes it has steering but thats another headache actually! If i was to build another vehicle i think i would use skid steer! I have ordered the pwm module so I'll let you know how it goes.
  15. dubya_80

    Variable speed control of multiple dc motors

    My existing relays are wired to deliver a variable input in forward or reverse. I tried using a pot to vary the power but i had no start up power except on full. I think this unit will deliver variable speed to the motors.
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