Unable to get current

[ericgibbs]

h. thanks. can you foward me the real scematic

hi,
Try these two sims.
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[ericgibbs]

View attachment 102165

what is this for ? the purpose and function of it?

hi.
It is a Voltage to Current converter circuit.
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[momo36]

hi,

i am unable to open the ca3140 missing. is there any replacement for that?

 

[momo36]

I cannot find a SPICE model for Ca3140. They have data sheets for them but no SPICE models for them, even though they do have models for other ICs in their range.

 

[ericgibbs]

You can any good OPA with a single supply operation specification, try the LT1006 in OPA folder

 

[momo36]

hi,

i do not know why when i measure the graph the first period i get zero micro Ampere.

 

[momo36]

attached is the latest circuit

 

[ericgibbs]

hi,
Replace the OPA with a LTC6240, it is the F2 OPAMP list.
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[momo36]

thanks