MEP EP#225: Clipping and Clamping OpAmps

<h4><a href="https://macrofab.com/blog/mep-ep225-clipping-and-clamping-opamps">MEP EP#225: Clipping and Clamping OpAmps</a><br></h4><h4>Stephen</h4> <ul> <li><strong>DC heaters continued</strong> <ul> <li>Tested the new values</li> <li>Last episode was shooting for ~250mW of dissipation in the regulator and transistor</li> <li>Measuring closer to 350mW <ul> <li>Quiescent current and some balancing and tolerance</li> </ul> </li> </ul> </li> <li><strong><a href="https://www.electronicdesign.com/technologies/analog/article/21801600/op-amps-make-precision-clipper-protect-adc" target="_blank" rel="noopener">Opamp clamping circuit</a></strong> <ul> <li>A useful voltage clamping circuit with independent upper and lower thresholds</li> <li>Pros <ul> <li>Much more accurate than the simple clipping circuits</li> <li>Hard turn on characteristics</li> <li>Can be overdriven without much issues</li> <li>Not terribly expensive</li> </ul> </li> <li>Downsides <ul> <li>3 or 4 opamps needed</li> <li>Not particularly fast - starts to show issues past 20k and is pretty bad at 30k</li> <li>Small overshoot that is frequency dependent</li> <li>Does not work with opamps that have input protection diodes</li> </ul> </li> </ul> </li> </ul> <h4>Parker</h4> <ul> <li><b>Brewery Updates!</b> <ul> <li> Installed <ul> <li>Tubing</li> <li>Pumps</li> <li>Pots</li> </ul> </li> <li>Waiting on <ul> <li>Stainless mesh basket</li> </ul> </li> <li>What is left <ul> <li>Design and build the grain crane</li> <li>Mount electrical box</li> <li>Finish wiring</li> <li>Paint and sealant</li> </ul> </li> <li>Electrical Box <ul> <li>Might have put the power input in the wrong spot!</li> <li>Need to finish the wiring.. Need to order more wire I think...</li> </ul> </li> </ul> </li> </ul> <h4>R.F.O.</h4> <ul> <li><b>Rules of thumb - Are they obsolete? </b></li> <li><b>Next week we have Al Williams on from Hack a Day</b> <ul> <li>If anyone has a