Hello everyone,
I have a small problem, I'm trying to simulate a little headphone amp circuit for some uni coursework, which uses the LM386 opamp. Unfortunately this opamp is different to usual, in that it has the gain internally set to 20, and I can't find any models of it anywhere. I was wondering if any of you had any suggestions as to how I might approach this?
Here's a link to the datasheet:
http://www.national.com/ds.cgi/LM/LM386.pdf
Cheers,
Steve
I have a small problem, I'm trying to simulate a little headphone amp circuit for some uni coursework, which uses the LM386 opamp. Unfortunately this opamp is different to usual, in that it has the gain internally set to 20, and I can't find any models of it anywhere. I was wondering if any of you had any suggestions as to how I might approach this?
Here's a link to the datasheet:
http://www.national.com/ds.cgi/LM/LM386.pdf
Cheers,
Steve
1 LM386 has too much gain for a headphone amp.
2 Why must you use this IC?
3 Why do yoiu have to simulate?
2 Why must you use this IC?
3 Why do yoiu have to simulate?
1. Isn't it set at 20 without using extra components on pins 1 and 8? This isn't necessarily a headphone amp in the usual sense, as it has a mic input so probably needs more gain than a CDP source might.
2. It's part of the set coursework, and the ready made circuit boards we were testing... I take no responsibility for my lecturers choices! 🙂
3. I missed the lab session as I was the other side of the country at the time, and I would like to learn more about simulating circuits.
Cheers,
Steve
2. It's part of the set coursework, and the ready made circuit boards we were testing... I take no responsibility for my lecturers choices! 🙂
3. I missed the lab session as I was the other side of the country at the time, and I would like to learn more about simulating circuits.
Cheers,
Steve
peranders said:
Actually, the LM386 is used in quite a few ham radio audio circuits -- in which case a headphone is used as the transducer. The quiescent current isn't the lowest, but it is versatile.
As far as modeling the device -- just create a "subcircuit" from the National Semiconductor outline.
Hi,
Thanks for the suggestion! Any chance you could elaborate a bit though, bearing in mind I only have half a days experience with Spice so far. I think I know what you mean, but unsure as to how to go about it.
Cheers,
Steve
Thanks for the suggestion! Any chance you could elaborate a bit though, bearing in mind I only have half a days experience with Spice so far. I think I know what you mean, but unsure as to how to go about it.
Cheers,
Steve
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