Hi, for my ultrasonic sensor project i want to go with a design based on the link shown, but before I do I want to understand a few things
https://www.electro-tech-online.com/custompdfs/2009/04/srf1.pdf
I was wondering - in the receiver -what design decisions are made with C6, C9 and R7 (in terms of values and why they are there!).
Im pretty sure i know C9, its just to remove residual DC
The way to calculate C9 i assume would be just to say....
1 / (2π f RIN)
with f being 40000 (40khz ultrasound) and Rin being 10000ohms (as I assumed the input impedance of the transducer to be 10000ohms)
I do not know what C6 and R7 do, and how effect the circuit and how there values are chosen?
Thanks for any help, im really stuck.
https://www.electro-tech-online.com/custompdfs/2009/04/srf1.pdf
I was wondering - in the receiver -what design decisions are made with C6, C9 and R7 (in terms of values and why they are there!).
Im pretty sure i know C9, its just to remove residual DC
The way to calculate C9 i assume would be just to say....
1 / (2π f RIN)
with f being 40000 (40khz ultrasound) and Rin being 10000ohms (as I assumed the input impedance of the transducer to be 10000ohms)
I do not know what C6 and R7 do, and how effect the circuit and how there values are chosen?
Thanks for any help, im really stuck.
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