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Old 08-02-2010, 01:05 AM #1
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Default Controlling output Mw betweem driver and diode

Hey guys,

New here posting though I've been a lurker for a while. I recently purchased a 445 diode from a Casio projector online. I also bought a Flexdrive driver as well, but I really don't want to have to deal with the preset Mw setting of the flexdrive all the time. What I'd like to do is have some way of dropping the voltage to the diode from flexdrive. I thought I could just wire in a pot between the the two but after doing a lot of reading here on the forum it seems that that would be a bad idea due to possible voltage spikes to the diode as the pot "rolls over" it's internal coil. That got me thinking that what I needed was a pot that was controlled electronically rather than mechanically, so I found this online: Digital Volume Control

It's a circuit that with some additional switches and a capacitor can control the volume of an audio device, I'm assuming a pair of headsets, similar to how one might up the volume by pushing the up button on the side of an mp3 player. In theory, I'm assuming one could "step up" or down the voltage coming from a flexdrive to a diode by injecting this circuit between the two and thus lower or raise the output of the diode up to the maximum of what the felxdrive is set to. Ideally I'd like to turn down the power going from the flexdrive to diode to zero and then to max by just tapping the up and down buttons.

Since the company that makes this circuit gives away free samples, I went ahead and ordered one this past week, but I thought I might just post this here on the forum to see what anyone might think.

Thanks!


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Old 08-02-2010, 01:21 AM #2
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Default Re: Controlling output Mw betweem driver and diode

Quote:
Originally Posted by T23D View Post
Hey guys,

New here posting though I've been a lurker for a while. I recently purchased a 445 diode from a Casio projector online. I also bought a Flexdrive driver as well, but I really don't want to have to deal with the preset Mw setting of the flexdrive all the time. What I'd like to do is have some way of dropping the voltage to the diode from flexdrive. I thought I could just wire in a pot between the the two but after doing a lot of reading here on the forum it seems that that would be a bad idea due to possible voltage spikes to the diode as the pot "rolls over" it's internal coil. That got me thinking that what I needed was a pot that was controlled electronically rather than mechanically, so I found this online: Digital Volume Control

It's a circuit that with some additional switches and a capacitor can control the volume of an audio device, I'm assuming a pair of headsets, similar to how one might up the volume by pushing the up button on the side of an mp3 player. In theory, I'm assuming one could "step up" or down the voltage coming from a flexdrive to a diode by injecting this circuit between the two and thus lower or raise the output of the diode up to the maximum of what the felxdrive is set to. Ideally I'd like to turn down the power going from the flexdrive to diode to zero and then to max by just tapping the up and down buttons.

Since the company that makes this circuit gives away free samples, I went ahead and ordered one this past week, but I thought I might just post this here on the forum to see what anyone might think.

Thanks!
You will need to learn the terminology used with Laser and Laser
Drivers...

The flexDrive output can be adjusted by mA not mW...

The Flexdrive out outs current... it is an adjustable Current
Laser Driver.

There is no internal coil in a trimpot

The output of the Flexdrive is CURrENT Limited... Not Voltage
Limited... You can not put a Variable resistance between the
OUTPUT of the Flexdrive and the Laser Diode.... You will change
the feedback value of the feedback circuit...

If you had read the Data Sheet for the DS1669 you would have
seen that the maximum current through the device is only 1mA
making it useless to control anything requiring over 1mA of
current...(like a Laser Diode)

Jerry
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Old 08-02-2010, 01:36 AM #3
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Default Re: Controlling output Mw betweem driver and diode

Thanks Jerry, I see that I still have a lot to learn.
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