Old 08-13-2013, 11:26 PM #1
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Default can i put the voltage pot after the driver?

I feel like I need to, my driver has a very low drop, and I need like 3v max and its giving 4.8 at the end. I cant just remove a battery because I need between 4 and 5 for the board, so is this plausible, or am I confused?


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Old 08-13-2013, 11:58 PM #2
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Default Re: can i put the voltage pot after the driver?

what batteries and driver are you using and diode too ?
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Old 08-14-2013, 12:10 AM #3
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Default Re: can i put the voltage pot after the driver?

3AAA batteries, this driver (Amazon.com: AixiZ 2 pack red and IR laser diode driver 80-500mA w/TTL: Everything Else), and these diodes (5pcs 650nm 660nm 250mW 350mW Push CW Red Laser Diode LD Mitsubishi ML101U29 25 | eBay)
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Old 08-14-2013, 12:16 AM #4
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Default Re: can i put the voltage pot after the driver?

I see you had another thread similar to this in which I left a link, basically you need a test load that comprises of 4 1n4001 diodes and a 10ohm (i think) capacitor

you hook the driver to the test load and use you DMM to measure the output in mA and adjust the driver to the required output. using 3AA's is fine. The driver will handle everything else
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Old 08-14-2013, 12:20 AM #5
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Default Re: can i put the voltage pot after the driver?

that's just my point, unless I am not to worry about the output voltage until the dummy load is put on, its still too high?
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Old 08-14-2013, 12:21 AM #6
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Default Re: can i put the voltage pot after the driver?

Laser driver - It can be done

its 1 ohm here
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Old 08-14-2013, 12:43 AM #7
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Default Re: can i put the voltage pot after the driver?

Yeah, it's been a while since i built a test load, As for the parts, they will all work fine, but definitely need a test load to set the driver or you could end up over powering it and frying the diode
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