Trying to use transformer in mic preamp with TINA TI

[inkl]

Here's the circuit of an amplifier where the speaker is used as a microphone:

An externally hosted image should be here but it was not working when we last tested it.

And this is my TINA simulation:

An externally hosted image should be here but it was not working when we last tested it.

1) I'm not even sure I understood the circuit right. Especially, regarding split voltage source.
2) When I check the simulation in TinaTI is gives me these errors:

- Pin Prim1 of Ideal Transformer TR1 is floating (This node will be grounded)
- Pin Prim1 of Ideal Transformer TR1 is floating (This node will be grounded): Pin 2 of Loud-speaker SP1 is floating (This node will be grounded)
- Pin Prem2 of Ideal Transformer TR1 is floating
- Pin Prem2 of Ideal Transformer TR1 is floating: Pin 1 of Loud-speaker SP1 is floating

I do not understand these errors, can someone please explain what's wrong with it?


The .TSC file is here in case you want to use it.


Thank you!

 

[SemperFi]

1. What u mean u dont understand split voltage supply? U have a positive 9V and negative 9V supply...
2. I havent used TINA, but in LTspice u cannot float any comppnents. So the primary, or N1, must be connected to GND even if via a very high resistance. There is leakeage in the real world anyways, so 10meg-1giga ohm should do.
It also seems to have issues with the loudspeaker... I assume specs for that part is defined somewhere...?
But should u use a loudspeaker at input for sim? Shouldnt that be a voltage source?
Then again the gain is set with the source impedance and value of P1, so some resistance must be in series with the source.
Perhaps that helps.