AVR-Chat

--- In AVR-Chat@yahoogroups.com, James Washer <washer@t...> wrote:

> I'm just starting to play with
> the ADC ... Are 1% resistors
> what everyone uses ...

Are you sure this is what you want to know? In my case, yes, I use 1% 
resistors in analog circuits around the ADC. But your needs may be 
different from mine.

> ... or do I need something more
> precise?

You say "play", so I think the answer is no, use 1%. To properly 
answer the question, we would need to know what you are trying to do 
and what your circuit is (i.e. how many resistor tolerances are 
adding up in your error).

It has been suggested that you can use a meter to measure the 
resistance accurately. Many meters have accuracies of less than 1% 
and if you are "playing" this is probably what you have. Take a look 
at your meter specs before you trust its reading more than the 
nominal value of a 1% resitor.

Graham.