National LM2907 Chip ?

[bcroe at juno.com]

Bob,

Perhaps you could tell me what you have connected to 
each pin.  You want it to switch at 325 HZ? 

Bruce Roe

On Fri, 08 Mar 2002 07:47:13 -0500 Robert Wimmer <wimmerr at georgetown.edu>
writes:
> Help!!!
> I have an application for an rpm activated switch.  So instead of 
> buying a $60 one from
> Summit, I decided to build one using a National LM2907 chip.  I 
> built the "speed switch"
> circuit that National lists on their data sheet for the chip and it 
> doesn't work.  I'm
> using the output signal from the crank sensor which measures around 
> 4.5 volts and 325hz
> at idle.  Now I'm a ME not an EE, so trouble shooting a RC circuit 
> is a little beyond me.
> 
> Has anyone built a circuit using this chip? Any help would be 
> appreciated.
> 
> Thanks,
> 
> Bob W.

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