> Can anyone recommend a book or does anyone have any > documentation on how Op Amps work?. Steven, You can't get much better than the Op-Amp Cookbook by Walt Jung: http://www.amazon.co.uk/exec/obidos/ASIN/0138896011/qid=1052402115/sr=1-1/ref=sr_1_18_1/202-6545492-9658229 Jeff