Microp-Cap problem...please help!

[gvanto]

Im having a problem with something very simple (in Micro-Cap 7)

I have a simple circuit (op-amp feedback circuit).
It has input VIN1 and output node VOUT1, and simulates just fine.

When I then copy this EXACT circuit (highlight it, hold CTRL and drag away copies it), the nodes are automatically renamed (ie. VIN1 becomes VIN2, R1 is R2, etc) which is as expected.

But when I simulate the new circuit, totally different results come out!! This mind-boggles me :?:

Any help much appreciated,
gvanto

 

[Borber]

Your description of problem is insufficient. One of the possibilities for different results is if your opamp has auto added supply voltages, they are also renamed when you make a copy of circuit but they do not exists. You must add two new voltage sources VC1 and VE1 or change VC1 to VC and VE1 to VE.

 

[gvanto]

Thanks Borber that was the problem precisely! (Schoolboy error by me)

best regards,
gvanto

 

[keen]

hi boys,

a question about microcap7.
i just want to plot the data
i used SDT(v(1)) integration on existing data
the result graph has right amp. & frequency
but it has ofset. How to remove this ofset?

The root function is v(1) =A.sin(kt),
SDT(v(1)) must gave - A/k.cos(kt)

but from SDT I get - A/k.cos(kt) + A and this is wrong .

who know? please tell me ..

regards Keen