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January 15th, 2006 - Adventures in Engineering — LiveJournal
The wanderings of a modern ronin.

Ben Cantrick
  Date: 2006-01-15 23:47
  Subject:   You know what, Kyle? I've learned something today.
Today I learned that op-amps (expect special, expensive ones) won't assert their full supply voltage(s) to their output. Moreover, the difference between the best possible output and the supply voltage is usually greater than 0.7 volts. In practical terms, this means that an op-amp output can be pushing itself as far down as it goes, and the voltage it's asserting still may not be low enough to turn off your transistor that has a 0.7V base-to-emitter threshold.

I've also learned that electronic circuits in general work a whole lot better if you actually put the zener diode in place with the correct lead pointing towards ground!
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