Circuit Break - A MacroFab Podcast

MEP EP#225: Clipping and Clamping OpAmps

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MEP EP#225: Clipping and Clamping OpAmps

Stephen

  • DC heaters continued
    • Tested the new values
    • Last episode was shooting for ~250mW of dissipation in the regulator and transistor
    • Measuring closer to 350mW
      • Quiescent current and some balancing and tolerance
      • Opamp clamping circuit
        • A useful voltage clamping circuit with independent upper and lower thresholds
        • Pros
          • Much more accurate than the simple clipping circuits
          • Hard turn on characteristics
          • Can be overdriven without much issues
          • Not terribly expensive
          • Downsides
            • 3 or 4 opamps needed
            • Not particularly fast - starts to show issues past 20k and is pretty bad at 30k
            • Small overshoot that is frequency dependent
            • Does not work with opamps that have input protection diodes

              • Parker

              • Brewery Updates!
                • Installed
                  • Tubing
                  • Pumps
                  • Pots
                  • Waiting on
                    • Stainless mesh basket
                    • What is left
                      • Design and build the grain crane
                      • Mount electrical box
                      • Finish wiring
                      • Paint and sealant
                      • Electrical Box
                        • Might have put the power input in the wrong spot!
                        • Need to finish the wiring.. Need to order more wire I think...

                          • R.F.O.

                          • Rules of thumb - Are they obsolete?
                          • Next week we have Al Williams on from Hack a Day
                            • If anyone has any questions for him let us know in slack!
                              • ...more
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