Rocket Science

Please tell me how you would design. Application - Operate vibrating
motor with 1 button battery and on/off swith. The PRIMARY desgn
concern is SMALL in size - every
MM is critical. Battery should operate motor for 15-30 mintues at full
power - we don't want to regulate power to motor as the battery is
barely enough to drive it as is.

Operation - Initiate on button (assume tact switch) motor runs and
remains running until switch is initiated again and motor is now off.


Planned components.


Battery - LR43/G10 - http://www.microbattery.com/tech-maxell-alkaline.htm
(smallest battery we can effectively use as far I know)
OTHER OPTION 2 G8 batteries get's us to 3Vs

Motor - http://vibratormotor.com/vib/z4tl2a0380581.html
OPTION 2 with 2GB batteries 3V - http://vibratormotor.com/vib/z4tl2b0380581.html

Switch -http://www.omroncomponents.eu/home/products/Switches/
TactileSwitches/standard/B3U/default.asp

I have assumed a tact switch because I could not find a latching
mechanical switch that was small in size. A latching switch would be
nice because that simplifies things. The other MUST on the switch is
low operting force - would prefer 160Gf or less. Once again SIZE is
critical - I would like to keep it below 6x4x5 (LxWxH) mm.

So if we use a tact switch then we need an IC switch of some sort.
Press then release the tact sw., circuit is closed and motor operates
(circuit remains closed). Press then release tact sw. again and motor
is now
off/circuit open. This is the part that is missing some sort of
switching IC. I am working
with a factory in China and they had a concern that as the voltage
drops off the IC will not work properly. This might be the low
dropout? I am no electrical enginner, but I do search hard and I
noticed a lot of the IC switches that I researched require 1.65V or
more to operate. I'm not even sure I'm looking at the correct
components, but I can imagine a switch requires some V to remain in
the closed/latched position. I think the concern is the motor sucks
a lot of power from the battery and V will drop off - but we want the
motor to operate at the highest capacity until the battery is dead or
it is turned off.


I had one response earlier that suggested a NPN transistor, but I am
wondering if this works with the tact switch - circuit remains closed
after momentary
intitiation of tact switch. Please excuse my ignorance, but I'm
trying to understand and learn.

Please remember SIZE is extremely important. You can call me if you
have any questions 480-990-3023.

Thanks for looking at this and responding.

Some guy asked if I would pay through PayPal - I'm not opposed to this
if you are sure you can do what I need within the space constraints;
however, I really didn' think this was rocket science.

Randy

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