Hello
Would anyone have a simple sine to square converter cicuit for Quadrature A and B signal for linear/ rotary encoders please.


Regards

Paul F Savigar
ABS Measurement CC

South Africa

 

You have a quadrature encoder that puts out a sine wave?

 

Hi Paul,
What is the frequency/amplitude specification for the Sine and Square wave signals.

This link is a quadrature generator,

E
https://forum.allaboutcircuits.com/...signal-gen-2-phase-non-overlapping-clock.654/

 

Part number or datasheet for the encoder?

Peak-to-peak voltage and max. frequency of the sine wave?

Voltage of the output square wave?

Anything?

ak

 

Sorry, I was a bit vague.
It is Heidenhain 3.8vdc 11um sine A and B , 90deg phase shifted to TTL A and B 90deg phase shifted.
sine inputs are floating ( no gnd)

Thank you
Rgds

Paul

 

You have a quadrature encoder that puts out a sine wave?

Yes , Heidenhain

 

Yes , Heidenhain

Post the part number and specs.

 

Exactly what type of interface is it?
https://www.heidenhain.com/fileadmin/pdf/en/01_Products/Prospekte/PR_Interfaces_ID1078628_en.pdf

 

You have a quadrature encoder that puts out a sine wave?

Yes, there are such things. Actually, two sine waves 90 degrees out of phase. They allow for much finer positioning, down to the phase noise in the signals. I've not designed one into a system, but I have repaired systems that use this.

ak

 

Yes, there are such things. Actually, two sine waves 90 degrees out of phase. They allow for much finer positioning, down to the phase noise in the signals. I've not designed one into a system, but I have repaired systems that use this.

ak

+1

https://forum.allaboutcircuits.com/threads/pic32mk-mc-qei-example.150351/post-1531704
https://www.renishaw.com/en/resolute-encoder-series--37823

 

Hi Paul,
What is the frequency/amplitude specification for the Sine and Square wave signals.

This link is a quadrature generator,

E
https://forum.allaboutcircuits.com/...signal-gen-2-phase-non-overlapping-clock.654/

It will depend on the speed of movement of the machine 0 to 2khz roughly

 

I would like to add that we have the hardware , and it revolves around the LM339 quad comparator.

I just want to make it up on Veroboard, but cant work out the circuit.

Rgds

Paul

 

Hi Paul,
Based on the very basic information you have posted, is this the type of LM339 circuit you have in mind?

E

 

Hi Paul,
Based on the very basic information you have posted, is this the type of LM339 circuit you have in mind?

E
View attachment 314579

Hi Eric, Absolutely! But there are two input signals A and B using just the one LM339 ?
Rgds
Paul

 

Hi Paul,
Do you mean something like this ? If you posted a simple sketch, that would help.

E
OT: RSA down in PE is my 2nd home.

 

So we have ,
Phase A in - 5v TTL out
Phase B in - 5v TTL out
90deg phase shifted

We need this I/f unit very often but have run out, and we want to make it in house.

Rgds

Paul

 

Phase A and B are both two wire inputs with no gnd or 0v
Rgds Paul

 

So its A and /A
B and /B

Rgds

Paul

 

lookup "differential line driver"
you still did not state part number or specs. some encoders are meant to reach high speeds (several MHz).

 

lookup "differential line driver"
you still did not state part number or specs. some encoders are meant to reach high speeds (several MHz).

I'm not sure what the max. speed would be.