Every type of op amp has its own characteristics. A TL071 will not work the same as an EL2004. In fact, EL2004 is not even an op amp. It is a high speed unity gain buffer.I am using Proteus as simulator, and a EL2004 as OP AMP, but I did not choose it particularly for this purpose. Seems there is not generic Op Amp in Proteus..
It works fine, however respect to the last scheme, it is not needed the 2nd Op Amp, just the first one with the feedback of the NAND to the pin (-). And reversing that RC, putting C to Vcc and R to ground. See scheme.
Regards,
Simon
There is an old saying about simulators that I heard years ago:
Garbage in = garbage out
This really applies in your case. You need to learn more about electronics before you start using simulators. A simulator is a tool. A tool in the hands of an inexperienced user can be nearly useless, or in some cases, even dangerous.
I am going to unsubscribe to this thread, as I don't like the direction it is going.
At the top of this page are links to a good ebook which can teach you a lot about electronics and electricity. I suggest that you read it.
Good luck.
EDIT: I want to make it clear that I like helping people, but I got tired of having to explain what's wrong with every shot-in-the-dark circuit you have been posting. Maybe it's my fault for having too little patience.
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