TPS Sensitivity

Kevin Vannorsdel kv at us.ibm.com
Tue Feb 24 20:36:54 GMT 1998


Sounds like what you are after is a differentiator.  This can be made with
opamps and caps... usually these circuits respond all too well to things like
noise etc though.... A differentiator is essentially a high pass filter.
Also, when putting Caps in a signal path... need to be careful to provide an
input bias current path (unless your opamp requires no input bias current (a
FET input)).

Maybe I have gotten too tired of dealing with analog circuit issues every
day... but it seems like this would be a quick and dirty (and fun) application
for one of those PIC microcontrollers discussed a while back.

If you want to see some differentiator circuits... let me know.

Comments invited...
________________________________________________
  Kevin Vannorsdel     IBM Arm Electronics Development
    408-256-6492                Tie 276-6492     kv at us.ibm.com




owner-diy_efi at efi332.eng.ohio-state.edu on 02/24/98 11:38:43 AM
Please respond to diy_efi at efi332.eng.ohio-state.edu @ internet
To: diy_efi at efi332.eng.ohio-state.edu @ internet
cc:
Subject: Re: TPS Sensitivity


While it might be too broad of subject for the list would someone
share with the list, or e-mail me about how to design a TPS
movement detection circuit for use like an acclerator pump,
for sensitivity, and duration.
  I tried feeding an op-amp thru two different resistors, and
and to caps at the op inputs, with resistors to bleed down
the caps, but no luck (this is a clue to my limited electrical
knowledge).
  Bruce    A 7805 on a bad day really smells bad (usually
               preceded by a whisp of smoke, that doesn't smell
               to good either)...






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