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circuit diagrams for diff. amps

Lance Corey lance at neuro.pharmacology.ubc.ca
Fri Jul 14 11:22:09 EST 1995

Tom Cunningham <phystom at showme.missouri.edu> wrote:

>I'm currently setting up a rig for extracellular recording of action 
>potentials. I need to come up with an inexpensive 
>amplifier that I can connect either to a window discriminator or an A/D 
>board. Our institute has a good electronics shop so making an amp is a 
>possiblity. If anyone out there has some suggestions for a good commerical 
>amp or a reference for a circuit diagram please drop me a line.

We have made several amplifiers and one suggestion that I have is that
you don't try to be too fancy.  One of the amps has an LED bar graph
to indicate the level of amplification; the problem with this is that
it introduces noice into the signal.  We also found it convienient to
have a zero offset in the circuit that can be disabled with a switch.

	Lance Corey
	Dept. Pharmacology & Therapeutics
	University of British Columbia

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