Sorry but it won't....
?
Simply because you don't have just the two
resistances there...
?
In fact the Op-amp has its own active resistance
and i feel that you can read that from any good book on Op-Amps......What you
can do is to give the input audio signal a DC offset of 6/Amplification
factor...that is 6 divided by amplification factor of op-amp...
?
Instead if you have two source use the way jim
uncle(with due respect :-)) told in the previous thread...
?
Regards :-),
?
--himanshu sharma
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Try
this:
???????????
+
???????????
|
???????????
R
???????????
|
?? *---||--------- Opamp
Input
???????????
|
???????????
R
???????????
|
???????????
-
Did you understand that ? I sure didn't :). The point with the
negative voltage is to allow the audio signal to swing both ways Now
if you're able to put the audio signal to swing around 6V instead of
0V, then you can just use the 12V car battery without a negative
voltage.
Use for example two 1K resistors. One between Vcc and
opamp input,
and one between opamp input and GND. Connect the opamp input
VIA A
CAPACITOR to the audio signal source.
I think that should
work
Mounir
--- In Electronics_101@y..., a_w_abate@y...
wrote:
> I was fairly interested in electronics when I was in high
school.
To
> the point where I built several kits including a
COSMAC Elf 1802
> computer. However, I strayed from the hobby over the
years but am
> slowly returning. Now I am challenged by OpAmps and
negative
voltage.
> I do not understand how to generate a negative
voltage (for
> differential inputs) from one power supply such as a car
battery. I
> am trying to build a small headphone amplifier and am just
coming
up
> with noisy audio. I believe this is because I am not
apply the
> negative voltage correctly. help!
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