100 ohm to ground instead of input coil directly to ground.
Using a scope may find the value of your current measuring the voltage
across resistor.
Compensate then by computation your 100 ohm error induced in system.
BTW, don't forget the load and a  clamp diode protection on input coil.
Vasile

On Thu, 22 Feb 2001, Paul Smith wrote:

> Hi all, Just doing some experiments with PWM on my 16f84 ,I have a 3k/3k
coupling transformer connected to RB0 in series to ground , As I am teaching myself electronics and pic programming out of books I am not sure if there should be a current limiting resister in there somewhere?? ( there is already 3k in the transformer)how do i find out how much current it can take?)
> I have not fried anything YET . ;-) but the point is I want to know how to do it properly!!
>
> When I have an example like a LED ,ohms laws etc. I can get along ,but I have not been able to find an example for this ..
>
>                   ______
> RB0-----------[ c/t      ]-----------
>                  [3kohms]            *probes output side
> gnd------------[______]-----------
>
> I am trying to emulate the output of a reluctor wheel on a output shaft which is a sinewave(hope I am on the right track!)
>
>
> Any help would be appreciated.
>
> Paul
>
>
>
>
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