Want to run kid's toy truck by adaptor

[Thaqalain]

Truck is having 6 cells of 1.5 v general size.I connected all cell
positions by fixing wire pieces in cell slots.Later I tried to charge
by choosing required voltage of 9v,by connecting two end terminals of
opposite polarity,but device is not producing sounds.
What remedy I can do?

 

[Thaqalain]

I done ,even open it's body and connected it's soldered terminals,but
sure something short,what it could be predict it by experience.May be
due to dropping from heights.
Last week,my kids dropped a musical pad from top of sofa,it was very
nice collection of tones.Can anyone predict,which component to be
looked?where is problem in such cases?

 

[Chris]

Thaqalain wrote:

I done ,even open it's body and connected it's soldered terminals,but
sure something short,what it could be predict it by experience.May be
due to dropping from heights.
Last week,my kids dropped a musical pad from top of sofa,it was very
nice collection of tones.Can anyone predict,which component to be
looked?where is problem in such cases?

Hi, Thaqalain. Your experience in your first post may have caused the
wall wart to expire. You admitted to shorting it out, which may have
let the smoke out of the wall wart. If you can't check it with a
meter, I'd look into finding a known good wall wart first. These toy
trucks may take up to an amp of current, so make sure you get one that
can handle that much of a load. Also, try to avoid the ultra-small,
ultra-light 9V adapters no matter what their current rating -- they
have cheapie switching power supplies, which chuckle weakly and die
when faced with a momentary short or the inductive kick of a toy motor.
Get a fairly heavy one that's an "unregulated" 9VDC supply rated for
at least 1 amp. And make very sure it says "9VDC", not "9VAC".

Having checked that off, you may want to look at the innards of the toy
and see that you've actually connected the wires of the wall wart to
the wires coming from the batteries. Just twisting them together isn't
good enough -- you'll have to solder. Be sure to provide some kind of
strain relief -- you don't want the toy truck to drive away and pull
off the solder joints.

If that's checked off, it's conceivable you could have the wires
backwards. That's especially the case if there's an IC,
microcontroller or some such in the toy. You still may not have smoked
the toy, though, because if it needs a polarized supply, they'll
frequently put a blocking diode in series which may have saved the day.
Try reversing the wires from your wall wart to the toy.

You may be almost there. Keep trying.

Good luck
Chris

 

[Thaqalain]

Thanks Mr. Chris for your knowlegeable reply.I will remember u in this
forum.