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Has adjustable Upper and Lower thresholds, Output is nice and square, and triggers without hiccups on pretty precise levels!
HOW TO SETUP:
- Left voltage divider sets the Lower Threshold.
- The right voltage divider sets the Upper Threshold.
HIGHLY ADVISED, but optional:
- Best practice before adjusting the thresholds is to pick a constant value for both upper legs of each voltage divider and only adjust the bottom resistance.
***This is because the inputs for the thresholds are also being pulled down by some transistors to create the triggering effect… due to this, it’s best to pick a fixed upper resistance for each voltage divider and stick with it cause it will affect the switching characteristics of the thresholds as you make adjustments if you don’t do it this way….
….(pick whatever value(s) you find works best for your scenario… fastest response times + lowest current draw possible is usually the goal. Lower values = Higher current = Faster, but too much means higher probability of overheating, and of course more wasteful/less efficient)***
NOTES:
-The input is the blue trace (same as sine wave input source)
-Output is the green trace
-The lower leg of the lower-threshold voltage divider is set to 1G Ohm in the simulation just to show that if you were to leave it floating, than it will simply tigger as low as it can: at its cut-off point. -(which will depend on the current through the collector/emitter: higher current = higher cut-off voltage levels, because it requires a higher Vbe to drive higher currents, therefore it’ll turn off sooner… visa-versa)
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