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The generic op-amp would suffice for lab experiments. A number of summer amplifiers attached to a central amplifier attached to a comparator is what those at Robert Gordon University apparently use. The virtue of that design is that all those parts can be made from op-amps.

Although I have not tried it, a schmitt trigger, which can also be made from op-amps, can probably be used instead of a simple comparator - making analogue ternary (three-state) logic, in other words.

Cheers.

For details, see http://www.rgu.ac.uk/files/chapter10%20-%20implementing%20ANNs.pdf

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