Timeline for Will this circuit work? AND Gate behaving strange?
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| Oct 3, 2012 at 16:25 | comment | added | Analog Arsonist | Make sure you aren't exceeding the input range of the opamp when you are using it as a comparator or just use a comparator. Also make sure if you use an opamp that it can drive its output to 0V, i.e., rail to rail and your input reference is within the common-mode range of the opamp. Again, better to use a comparator which is designed for this type of thing. | |
| Feb 5, 2012 at 6:54 | comment | added | Pentium100 | @KevinVermeer, a long time ago I used Crocodile Clips (didn't know any better) and it seems that Yenka is the new name for it. If the transistor is powered from some other supply, then you can just disconnect the LDR. I didn't think of it when I was writing my answer. | |
| Feb 5, 2012 at 5:42 | comment | added | Kevin Vermeer | Excellent answer! Looks like you even braved the Yenka software :) My only comment is that any implementor needs to be careful with how you power the transistor. If it's connected to the un-switched supply, you could end up driving the unpowered output of your op-amp high while the supply was low. This would damage the op-amp. | |
| Feb 3, 2012 at 18:57 | history | answered | Pentium100 | CC BY-SA 3.0 |