Monthly Archives: December 2015


Last time we looked at low pass filters, this time high-pass; it’s opposite day. We also take a brief look at capacitor types, as they are critically important to filter design. High Pass High-pass filters are encountered a little less frequently than the basic first-order low-pass, but they do have […]

Cooking with Op-Amps, part 9: High-Pass Filters!


Last time around, we embraced failure in wilfully destabilizing an op-amp. This time, we look at filters. We use a filter when only some frequencies of input signal are desired. The subject of filters is huge, and there’s no way to cover it exhaustively in a blog post. We can, […]

Cooking with Op-Amps, part 8: Low Pass Filters!


Last time we looked at configuring an op-amp with negative feedback, but with enough reactive (phase shifting) components to make it unstable. The trouble with the amplifier of choice is that it’s a very low-bandwidth part, intended for use amplifying slow or nearly DC signals. The size of components required […]

Cooking with Op-Amps, part 7: Test it!



Last time around we explored setting gain in inverting and non-inverting configurations, and how phase affects performance. This time, we embrace failure, in theory. We learn more when things go wrong, and an unstable amplifier could be classed as having gone wrong. Instead of waiting like lambs for the (ahem) […]

Cooking with Op-Amps, part 6: Make it Fail!