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A laser driver outputs very short pulses with very fast rise times required for some laser diode applications. But the driver requires an external trigger to operate. I want to give an example scenario to make my question clear, and expecting an estimate approximate answer.
Here is the manual...
I see and the strange thing is that the max diode reverse voltage of this laser-diode is given as 2V. In this case he is applying 5V reverse voltage and the diode still not damaged. Or maybe it is already damaged since never checked in forward biased way.
Yes exactly thats what I thought so. But he claims he gets some ultrashort optical pulses. Maybe some current passes during diode's recovery due to its capacitance. Yes pin 3 is for biasing but he doesn't use it he leaves it open. He uses only RF connector input with the wave form I provided. I...
Function generator is outputting this waveform observed when coupled to a scope https://www.edaboard.com/attachments/1687550647799-png.183510/ And when connected to the laser diode, the function generator is connected to the RF input of the laser I show in question. Isnt the diode reverse...
Hello,
One of my collogue is using the following laser-diode and only using the RF input and applying 5V to 0V short pulsed using a function generator.
He doesn't use the other pins only the RF input by an SMA connector.
Here is the diode pins:
And here is the signal he applies to RF...
I need to make a test load as shown below:
As seen above, the test load is mimicking a laser diode. It is composed of two of this Schottky power diodes in series and a 100 W 50 mΩ resistor (to measure the current.)
My problem is I can only use through hole and buy from a specific vendor, so...
I think your power dissipation for LM317 not correct(?) Ploaded≈(Vin−Vout)Iload which becomes 2W heat.
And please also let me know whether transistors( BUX48 and BD139 ) can be used for 500mA max continuous.
Does the second circuit have any advantage over Howland besides simplicity?
I meant...
Hi,
Thank you for your comment. Why precision? Because Vin dictates the laser current and I want the laser current to be stable as much as it can. Let me know if Im wrong. Im no expert.
About ESD I will do as much as I can when wiring with ESD wrist. But I heard from a collogue during the...
I want to make a simple driver(continuous current) for lab test purposes and need to use this laser diode and marked my questions in bold. Here is detailed specs given. The specs says that the "Operating Voltage" is between 1.5V typical to max 2V. I guess what they mean is forward voltage drop...
Hi thanks for the response,
Who is Brad?
Yes I need RC at the output.
At the input of my circuit opmaps have resistors. But not at the output. So I guess I need ESD protection diodes onlycat the output stage?
So I tried to modify it adding an RC filter for the bipolar output and also...
I will make a DAC output amplifier PCB using this quad-opamp(OP484FPZ) and the schematics is below so far:
Brief description about the application:
out1 and out2 will couple to a driver which controls a galvo-mirror. DAC input is coming from a 16-bit DAC(controlled by a STM2 microcontroller...
I will make a +/-15V supply for a device which requires +/-15V 3A power.
For that I will use two of this supply(their output is not DC grounded so it can be done) and two barrier diodes and wire as follows:
But how can I properly size the Schottky diodes in my case? Would two 1N5822 40V 3A...
Hi again,
One last question. I already ordered 4.7V 3W zener 1N5917BRLG. I was a bit late to see your 3.3V suggestion:( Would 4.7V 3w zener also be fine? Thank you for your help
(Yes my 12V supply has +-%5 regulation)
EDIT: I have now ordered 3.3V 5W zener anyways.
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