John Waters wrote:
> I need to turn ON or OFF a small 12V d.c. motor using a micro-switch,
> but
> the requirement is, the micro-switch must be operating like a toggle
> switch,
>
> I know a micro-switch alone will not be able to do this, I may need
> some
> relays or other components working together to achieve this, but I
> don't
> want complicated circuits that require a stable power supply,

The alternative with relays is a lot more clunky and complicated, especially
when considering debounce issues.

> I just want to
> use some simple passive components (and relays) to do this.

You are being silly.  You've got 12V, so a 7805 5V regulator and a couple of
caps will make a nice stable 5V power supply.  A PIC 10F200 can sense the
microswitch, perform the debouncing and toggle logic, and turn on the motor
accordingly.  The PIC can directly drive a IRFU3706 N channel FET low side
switch to control the motor.  The only other part you need is a reverse
diode accross the motor.

All this will be smaller, cheaper, more reliable, and take less power than
some relay logic.


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