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# why not get right result?

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#### wealth210

##### New Member
Hello
There is one simple circuit for LM386,but when I simulate it,I can't get the right result.Per LM386 specification,that circuit power gain is 20.And the input sinewave sinewae is 50mv,so the output pin5 will get 50mv*20=1000mv=1v(Pls note:LM386 power supply voltage is 6V).However,the simulation result is 12uv, not 1v,I don't know why happen this,pls correct me if I'm wrong.Thanks.

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#### ericgibbs

##### Well-Known Member
Hello
There is one simple circuit for LM386,but when I simulate it,I can't get the right result.Per LM386 specification,that circuit power gain is 20.And the input sinewave sinewae is 50mv,so the output pin5 will get 50mv*20=1000mv=1v(Pls note:LM386 power supply voltage is 6V).However,the simulation result is 12uv, not 1v,I don't know why happen this,pls correct me if I'm wrong.Thanks.

hi wealth,
The amplifier circuit is incorrectly wired.

#### audioguru

##### Well-Known Member
hi wealth,
The amplifier circuit is incorrectly wired..
No.
It is wired correctly but has a "divide by 2" voltage divider at its input so its output for frequencies from 100Hz to 100kHz is 0.5V.

Why bother simulating it? The LM386 is simply a piece of wire with gain.
The sim program doesn't know anything about it.

#### ericgibbs

##### Well-Known Member
No.
It is wired correctly but has a "divide by 2" voltage divider at its input so its output for frequencies from 100Hz to 100kHz is 0.5V.

Why bother simulating it? The LM386 is simply a piece of wire with gain.
The sim program doesn't know anything about it.

Woops!
Misread the type number as a conventional OPA, not an audio amp..

agu, send me your opticians phone number.

#### audioguru

##### Well-Known Member
agu, send me your opticians phone number.
Yesterday when I flew my electric RC model aiplane it caught a thermal (rising warm air) and went so high that I could hardly see it with my fixed eyes. I turned off its motor and it glided like a brick.

Then I noticed a pretty girl on the far side of the park and forgot about my airplane. It nearly hit me.

#### ericgibbs

##### Well-Known Member
Yesterday when I flew my electric RC model aiplane it caught a thermal (rising warm air) and went so high that I could hardly see it with my fixed eyes. I turned off its motor and it glided like a brick.

Then I noticed a pretty girl on the far side of the park and forgot about my airplane. It nearly hit me.

agu,
You seem to have a lot of pretty girls in your neighbourhood, are you sure that your new lenses are not rose coloured.

You should fit a minicam in your RC plane so that we can see all these lovely ladies.

#### audioguru

##### Well-Known Member
agu,
You seem to have a lot of pretty girls in your neighbourhood, are you sure that your new lenses are not rose coloured.
The new man-made lenses in my eyes are perfect so I don't need glasses anymore to see far away, colours are extremely vivid and I don't need sun glasses to block ultra-violet rays.
I notice only the pretty girls (yes there are lots of them and they like to be noticed) and don't see the ugly ones.

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