Brewery, DC Heater, Electronic Manufacturing, electronics podcast, MacroFab, macrofab engineering podcast, OPAMP, rules of thumb, THE CLAMPS
Podcast
225

MEP EP#225: Clipping and Clamping OpAmps

Podcast Notes

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!

Plumbing the brewery Parker is working on. Tubing almost complete!

Plumbing the brewery Parker is working on. Tubing almost complete!

 

Under the brewery table are where the pumps and plate chiller are mounted.

Under the brewery table are where the pumps and plate chiller are mounted.


Special thanks to whixr over at Tymkrs for the intro and outro!