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Active 2nd Order Filters:
Basic Introduction to Filters: application notes on active, passive and switched capacitor filters, document in PDF format
Butterworth Filters:
Chebyshe Volt / Butterworth Filters:
Chebyshe Volt Bandpass Filter:
High pass Filters use Modified Equal element Design: 05/24/01 EDN-Design Ideas / PDF contains multiple circuits - scroll to find this circuit.