Hi, if I am to test for the output waveform of the OPT101 using an oscilloscope, do I need proper biasing on the circuit or I could simply supply the IC using a power supply? I have tried the basic connections of the OPT101 and I powered it up by 5-10Vdc with1.5A but I got no luck in seeing its waveform in the oscilloscope.


Moderator's Note:
Please don't hijack other member's thread, now you have your own.

This thread was split from --
OPT101 Photodiode Transimpedance Amp circuit.
http://forum.allaboutcircuits.com/t...ansimpedance-amp-circuit.108024/#post-1091451

 

Hi, if I am to test for the output waveform of the OPT101 using an oscilloscope, do I need proper biasing on the circuit or I could simply supply the IC using a power supply? I have tried the basic connections of the OPT101 and I powered it up by 5-10Vdc with1.5A but I got no luck in seeing its waveform in the oscilloscope.


Moderator's Note:
Please don't hijack other member's thread, now you have your own.

This thread was split from --
OPT101 Photodiode Transimpedance Amp circuit.
http://forum.allaboutcircuits.com/t...ansimpedance-amp-circuit.108024/#post-1091451

What kind of waveform are you expecting to se? What is your light source?

 

Show us the circuit you used for testing.

 

Below is the TS's initial circuit which had been posted in another thread.

The output of the OPT101 should self-bias the output to about 7.5 millivolts. No need to add any bias. With only a 7.5 millivolt offset, expect to see a small signal at the output.

 

Below is the TS's initial circuit which had been posted in another thread.

The image didn't post here.

 

Strange, it shows up on all of my computers .

Let's hope the TS reappears and posts the current schematic.

@Gab Cruz please post your current schematic.

 

Hello guys, here's the pin connections that I used.
1-> 5V; Parallel ceramic( 0.1uf) & electrolytic(100uf) from Pin 5 to GND
2-> No connection
3-> GND
4 Feedback Input; Connect to 5
5 OUTPUT
6 No connection
7 No connection
8- GND
I just want to verify if the OPT101 that we ordered online is functioning well. However, I tried hooking it up to a programmable DC supply and I used 5-10Vdc 1.5A. I was expecting a waveform that corresponds to the light absorbed by the IC. But all I can see is a straight line corresponding to the DC supply.

I'll try again doing the circuit on a breadboard and I'll post again the results. Thank you for helping me

 

Just to be sure: Is the 1.5A you mentioned above the actual current drain or is that the rating of the power supply?+

 

That is the one showed in the programmable power supply.

 

I can't tell from your answer whether it is the number printed on your power supply or the number of amps that the power supply is measuring. Which of the two is it? Is anything getting hot?

Back to the main issue, what voltage what DC voltage do you measure on the output of the OPT101?