library of LT Spice for 2N5458, help

Thread Starter

Taleb_ak

Joined Dec 19, 2020
8
Hey guys,
I was wondering if anyone has the library to NJF 2N5458 for LT Spice. I want to make a wien bridge oscillator and I'm asked to use 2N5458 but it's not in the built-in library of LT Spice.
 
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Thread Starter

Taleb_ak

Joined Dec 19, 2020
8
hi Taleb,
Welcome to AAC.
This LTS asc file may help.
E
Thank you so much!!
You don't know how much I've been trying to find it!
Since you're amazingly fast in responding I have one more thing I couldn't figure. The output wave is not sinusoidal can you spot where the problem is?
I've attached my LT Spice circuit and the circuit given in the manual. Please
Btw I used 2N5485 instead of 2N5458 but I don't think it's the reason for not having a complete sine wave.
 

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Thread Starter

Taleb_ak

Joined Dec 19, 2020
8
hi T,
The control feedback loop is unstable.
Look at this asc.
Note I used my local LM741 model and pasted the MOSFET model to the circuit.
E
Note R5 and R6
Thank you so much for your patiently assistance!
Can I ask why did we add resistors R5 and R6? I mean do they have a special name or something?
 

Thread Starter

Taleb_ak

Joined Dec 19, 2020
8
Hello,

Have a look at the text around figure 5 of the attached PDF.

Bertus
Thank you so much!
It does make a lot more sense now.
Thank you all for the help I really didn't think anyone was going to help because it's my first time trying this but I totally recommend now!
 

ericgibbs

Joined Jan 29, 2010
12,883
Can I ask why did we add resistors R5 and R6? I mean do they have a special name or something?
Hi T,
I used those two resistors to get the correct level of feedback control, a pot will be also be effective as others have suggested.

E
 
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