Comments on: Ultrasonic Rangefinder, Part II: Receiver

By: Keith Neufeld

Keith Neufeld — Thu, 16 Nov 2017 17:07:27 +0000

Omer, you’re absolutely right — since the reference voltage goes to a high-impedance op-amp input, the same voltage divider can be used for both stages. Good catch!

By: Omer YILDIZ

Omer YILDIZ — Wed, 06 Sep 2017 09:48:55 +0000

This is a nice circuit.
I have a recommendation:

Two comparators have the same reference voltage already.
Remove R3,R4 and C2 from the schematic.
And, then, connect Pin 12 to Pin 10.
Save space and components on the circuit

By: Daniel Chokola

Daniel Chokola — Tue, 20 Apr 2010 22:17:24 +0000

The voltage divider made by R1 and R2 allow power supply noise onto your noninverting input. C1 and C2 form a low-pass filter that can eliminate some of this noise. That is probably why you noticed a cleaner signal with them installed.

On the other hand, I have no idea what RB is, either.

By: Keith Neufeld

Keith Neufeld — Wed, 25 Feb 2009 16:08:20 +0000

Zubair, it's the previous post.

By: zubair

zubair — Wed, 25 Feb 2009 05:21:34 +0000

please send the first part i.e.TRANSMITTER of this project

thanx