audio ampilfier with lm386

[erfan.bf]

I cant analyze it with pspice, please help me.

 

[erfan.bf]

this pdf is pspice schematic of audio amplifier.

 

[cowboybob]

Welcome, erfan.bf!

What problems are you encountering?

 

[erfan.bf]

Thanks cowboybob , problem is that pspice says no pspice template for lm386 !!!

 

[alec_t]

The Yahoo LTspice User Group has a freely downloadable LM386 model. Can you switch to LTspice, or perhaps edit the model if necessary to run in Pspice?

 

[erfan.bf]

No need ,Thanlks ,i made it

 

[erfan.bf]

i have next project , that is just a sine wave osillator. I need just RC s values !

 

[cowboybob]

i have next project , that is just a sine wave osillator. I need just RC s values !

Not sure if your asking for them but, generally speaking:

Freq= 1/R x C

For instance, with R=100k and C=100nF, freq=100Hz

Side note: there are quite a few "older" ICs for which there are no SIM models, e.g., the LM386 and one I really wanted, the LM567. Some users have made their own but I just breadboarded them - much easier than trying to create the spice models, at least for me.

 

[erfan.bf]

I know it but these values are not true ! I cant find values that make a sine wave. all of these waves are triangle or dc !

 

[cowboybob]

I know it but these values are not true ! I cant find values that make a sine wave. all of these waves are triangle or dc !

The RC formula I gave you sets the frequency of the oscillations, not the shape. A seperate RC (plus the LM386 circuit you choose) confiuration determines the wave shape.

Google "OpAmp" sine, square, sawtooth, etc. wave generator schematics.

 

[erfan.bf]

sorry i forgot it. i did nt say that i use LM741 in this project not LM386 !

 

[alec_t]

Don't expect a 741 to perform well. It has very limited bandwidth and considerable distortion. Ask AudioGuru .