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Topic: Simple 4051 analog multiplexing circuit not being so simple... Help appreciated (Read 1 time) previous topic - next topic

Wawa

I have a breadboard similar to the one above, but twice the length. The row (or I guess column depending on how you're looking at it) doesn't complete a circuit almost like there's no metal below.
Yes, there are "double breadboards" with four red lines and four blue lines.
Common problem. That's why it's always wise to post a picture of YOUR setup.
Leo..

exoro

Like I said, I appreciate all of you answering.

My last question is why do you recommend a 10k pot instead of a 100k. I swapped out to the 100k and it works fine. Sorry if I'm not understanding the technical reason behind it.

Grumpy_Mike

Quote
My last question is why do you recommend a 10k pot instead of a 100k.
Because that is what is recommended in the data sheet.

When a channel is changed or the input voltage changes if the impedance is too high then there is not enough time to charge up the sample and hold capacitor on the front of the A/D.

exoro

Because that is what is recommended in the data sheet.

When a channel is changed or the input voltage changes if the impedance is too high then there is not enough time to charge up the sample and hold capacitor on the front of the A/D.
Thank you!

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