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Topic: 0-10 V analog output / use of buffer (Read 315 times) previous topic - next topic

maminej

Apr 07, 2014, 06:53 pm Last Edit: Apr 07, 2014, 06:56 pm by maminej Reason: 1
Hell0,

I need general guidance for this problem.
I am interfacing with a laser controller and need to provide a 0 to 10V voltage to control the laser power.
I am thinking about using fast pwm, filtered by a low pass filter, along with a 2x non inverting op amp configuration to get 0 to 10v.
I can live with 255 step resolution for this application.
My question is on using a transceiver/buffer to interface with the device, to isolate both circuits.
Can anybody help me with the selection of the buffer ?


CrossRoads

You need an analog level to the laser, not a PWM signal?
Use a single transistor, lowpass filter its output.
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

Grumpy_Mike

Quote
My question is on using a transceiver/buffer to interface with the device, to isolate both circuits.

A transceiver/buffer is a digital thing and it does not provide isolation. If you want isolation then put the PWM signal through an opto isolator before sending it to the transistor and filter.

CrossRoads

Isolation is not really needed tho - just separation of the positives of the power supplies.
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

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