Re: Buffer circuits?
- From: Jasen Betts <jasen@xxxxxxxxxxxxxxxxxx>
- Date: Wed, 21 Dec 2005 07:11:39 -0000
On 2005-12-19, Ron J <bigschlong@xxxxxxxxx> wrote:
> All,
>
> Merry Christmas and a Happy New Year!
>
> I was looking through some sensors on Digikey. Some of the ratings are
> given at a certain load. For instance, 50 mV at 1 k-ohm. If I wanted to
> bump this voltage a bit higher, can I use the following op amp buffer
> ckt?
> The sensor output is connected to 1 k-ohm resistor with one resistor
> terminal connected to the non-inverting op amp input and the other
> terminal is grounded. The opamp output is looped back to the inverting
> input using a low loss piece of wire. The opamp output is then
> connected to my measurement device.
>
> Will this type of circuit work accurately with little deviation from
> the original voltage input at the opamp?
Yes. at low frequencies (DC to about 1KHz is excellent) higher frequencies
depend on the op-amp.
> I was thinking of all the losses that is encountered from the input of
> the opamp to its output. My main concern is that since the output
> deviation of the sensor only goes up to 50 mV at 1k-ohm, then noise
> might affect it significantly compared to a higher output voltage,
> right?
yes. you can get some gain from that buffer circuit by using a 1K resistor
from the inverting input to ground an a 10K from the output to the inverting
input
That'll amplify the input 11 times so your signal is 550mV want more?
increase the 10K.
--
Bye.
Jasen
.
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- From: Ron J
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