Tagged Questions
9
votes
2answers
346 views
How could I power an IC over the Ethernet?
I was looking foward to powering a small Integrated Circuit using only the power provided by the ethernet outlet of my room. Is that even possible?
I've googled and I've found that the voltage that ...
4
votes
1answer
230 views
How to Protect an ADC Input from Overvoltage
I have a module with an ADC with a maximum input voltage of 2V. I would like to monitor the battery voltage of 15V with this input. I have successfully used a trimpot as a voltage divider to ...
3
votes
1answer
158 views
How to use an audio codec as an ADC?
I would like to add ADC functionality to a TI C6748 dev board. I need 16bit precision, but relatively low sample rate(~5K).
Not finding any suitable daughter ADC card, I am considering the ...
2
votes
3answers
234 views
Current Drain on ADC
I am looking at a MCP3008 datasheet and it says that it has a maximum current drain of 150uA, and a typical current drain of 100uA.
I am building a voltage divider to knock down 96V to 3V. As this ...
3
votes
4answers
893 views
What is the purpose of this op amp?
I am trying to build a pH meter using the below circuit.
I am trying to understand the function of Op Amp U1. As I understand it, the LM4140A-1.0 is a voltage reference outputting 1.024V, which is ...
3
votes
1answer
705 views
What is the voltage range on an Arduino pin when doing analogRead()?
I know what an Arduino's ADC generates a number with 10 bits of resolution (0 to 1023).
How is this number generated? Is there a minimum and maximum voltage it will assign 0 and 1023 to, respectively?
...
