School has closed and we are now meeting online and worst part is doing labs in Multisim and LTSpice. Results are ideal at best... Having issues with this one - using Ti 741 model (http://www.ti.com/product/UA741/) results are similar with other opamps. LM308 gets a little closer but it oscillates even with compensating cap in sim.
Is this a sim/model issue or actual circuit issue? Sometimes the textbook circuits don't always work. Been struggling with this one for a while. It looks like it should work.
I can work out the problems (my answers in RED) by just using the formula but I would feel better if I can get the circuit to work in sim or actually...
Using TIP31 for the NPN. I don't like the diagram for number of reasons (electron flow and zener biasing is a little low)... but it should sort of work.
result:
Is this a sim/model issue or actual circuit issue? Sometimes the textbook circuits don't always work. Been struggling with this one for a while. It looks like it should work.
I can work out the problems (my answers in RED) by just using the formula but I would feel better if I can get the circuit to work in sim or actually...
Using TIP31 for the NPN. I don't like the diagram for number of reasons (electron flow and zener biasing is a little low)... but it should sort of work.
result: