Need help, Series RLC resonance circuit, not getting high voltage

[kougou]

Hi all.

I am currently building a series RLC circuit as a magnetic field transmitter. Because I want to have a strong magnetic field, I need high voltage by making the circuit at resonance.
Here are the parameter I used:
L:1.15mH
R: 50 (internal resistance from functional generator )+ 0.58 (from inductor)
C: 1 nf.

Using equation the equations w0=1/sqrt(LC), and Vc= Q Vs= 1/R*sqrt(L/C)*vs,
w0=148kHz, and Q=21.2V, and Vs=5V(square wave), so voltage across capacitor should be around 108 V rms.

But using the oscilloscope, the V pk-pk voltage measured is only about 60 V, Vmax is about 20V.

So, why am I not getting the calculated result?

 

[Simon Bridge]

A square wave is not a pure signal is it?
What happens when you put a range of frequencies into a resonator?
It could also be that your voltage source cannot provide more than 20V.

 

[kougou]

A square wave is not a pure signal is it?
What happens when you put a range of frequencies into a resonator?
It could also be that your voltage source cannot provide more than 20V.

Thank you for your reply
The source is square wave, and it's jumping from 0 V to 5V. But the resonance voltage across the capacitor should be 5*Q=108V rms. One possiblity is that the functional generator doesn't provide that much current.
Besides that,
I don't know why my circuit doesn't know. Do you have any idea.

 

[Simon Bridge]

You are going to be restricted by the available power yes.
Have you tried driving the circuit with a sine wave?

 

[sardar]

Hello,

Thank you for reaching out for help with your series RLC resonance circuit. It sounds like you are trying to create a strong magnetic field by achieving high voltage at resonance. However, you are not getting the expected results when measuring the voltage across the capacitor.

There could be a few factors contributing to this issue. First, it is important to make sure that all of your components are properly connected and functioning correctly. Check for any loose connections or faulty components that may be affecting the circuit's performance.

Another possibility is that there may be some energy loss in the circuit, resulting in a lower voltage than expected. This could be due to factors such as resistance in the wires or components, or leakage in the capacitor. You may want to check for any sources of energy loss and try to minimize them as much as possible.

Additionally, it is important to consider the limitations of your equipment. The functional generator and oscilloscope may not be able to accurately measure high voltages, so the readings you are getting may not be entirely accurate. You may want to try using more precise equipment or techniques for measuring voltage, such as a digital multimeter or a voltage divider circuit.

I hope these suggestions help you troubleshoot and improve the performance of your series RLC circuit. Remember to always double check your calculations and make sure all components are functioning properly. Good luck with your project!