Simulated many preamps from the web on TINA

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Discussion Overview

The discussion revolves around the simulation of various preamplifier circuits using TINA software, focusing on issues related to circuit performance and component representation. Participants explore troubleshooting techniques and circuit configuration challenges.

Discussion Character

  • Technical explanation, Debate/contested, Experimental/applied

Main Points Raised

  • One participant reports that simulations of preamps yield improper results and questions whether the issue lies with their approach or the simulation capabilities of preamps.
  • Another participant suggests a troubleshooting method using voltage controlled voltage sources (VCVS) to isolate potential problems with Op Amp models or the simulation software.
  • Concerns are raised about the visibility of schematic connections, with a request for clearer representation due to color contrast issues.
  • Participants note the absence of a negative supply in the circuit, with one asserting that it is incorrectly connected to the top amplifier and suggesting a reversal of supply wires.

Areas of Agreement / Disagreement

Participants express differing views on the source of the simulation issues, with some attributing it to the Op Amp models and others pointing to potential errors in circuit configuration. The discussion remains unresolved regarding the root cause of the problems encountered.

Contextual Notes

Limitations include unclear schematic representation and potential misconfiguration of circuit components, particularly concerning power supply connections.

m718
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I simulated many preamps from the web on TINA and none of the circuits show proper results
am I doing something wrong or preamps can't be simulated? I tried transistor and opamp ones.
here is an example.
For some reason the component values are not there after I save the file.
here is the link "http://cds.linear.com/docs/Datasheet/lt1115fa.pdf"
under TYPICAL APPLICATIONS
 

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I don't use TINA but, in any SPICE based engine, you can troubleshoot your circuit by replacing the Op Amps with voltage controlled voltage sources. Make their gains 100000. If it works, you have a problem with your Op Amp models. If it does not, there is a problem with the program itself. A VCVS with high gain acts as an ideal Op Amp.

It is difficult to read the schematic. On my screen the connections appear yellow on white. Cannot see the dots as well. Please repost with black connections.
 


I don't see your negative supply to the op-amp.
 


dlgoff said:
I don't see your negative supply to the op-amp.

It's there, it's just connected incorrectly to the top amp. The supply wires need to be reversed on it.
 

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