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I've got a situation where a high impedance sensor is feeding analog
information into a PIC A/D input.  The datasheets sez not to use PIC A/D's
with input impedances > 10Kohms.  The sensor is basically a phototransistor,
with a 2 meg collector resistor for high gain.

So I either need to use a buffer, or do what the data sheet says not to do.

Now the obvious way to accomplish this is with a simple op-amp unity gain
circuit, as shown in the attached schematic.  All fine and well, but the op
amp costs US$0.95, whereas the sensor costs US$0.15.  It's costing me more
to buffer the signal than the original sensor costs!  My assignment was to
come up with a really low cost sensor, so far, not so good.


Now, we in the consumer appliance field consider a buck to be a lot of
money.  What I'd like is either:

A. To decide I can get away with no buffer at all, by hook, crook, cheat or
trick.

OR

B. To use a cheap two-or-three transistor amplifier.  I get transistors
three for a nickel, and resistors four for a penny, so any concievable
combination of bipolar  transistors and resistors would be plenty cheap.
FETs (the other obvious choice) are probably out of my price range.  So far,
I've not been able to get anything to work so well.

OR

C. Something else.


-- Lawrence Lile
Sr. Project Engineer
Salton inc. Toastmaster Div.
573-446-5661 Voice
573-446-5676 Fax

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