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Old 10-02-2008, 06:06 PM #1009
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Default Re: DIY Homemade laser diode driver

will i need to change anything on this to power a red diode at 200mw?


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Old 10-03-2008, 04:15 AM #1010
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Default Re: DIY Homemade laser diode driver

I am guessing you mean 200mA.

Just adjust your pot until you have 200mA of output using your test load.
With two 10 ohm resistors the max output on your driver will be about 250mA.
If you want to set the max to 200mA there is a formula on the first few pages of
this thread that you can use to determine the ohms you will need for that.

Hope that helps.
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Old 10-04-2008, 07:09 AM #1011
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Default Re: DIY Homemade laser diode driver

Hi guys, btw, there is a website to calculate the value of the resistors.

Use a fixed resistor to set the UPPER limit of the current source. Lets call the R1.

The adjustable pot in SERIES with the above resistor ADDS to the total resistance from 0 (turned one end) to the value of the pot (turned the other end).
Lets call this R2.

So, the range of the resistance is actually from (R1 +0) to (R1+R2)

Here is the link to calculate resistor value for LM317:

http://www.reuk.co.uk/LM317-Current-Calculator.htm
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Old 10-05-2008, 08:47 PM #1012
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Default Re: DIY Homemade laser diode driver

Putting an on-on switch like this would discharge the capacitor when the switch is in the first position, right?
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Old 10-05-2008, 10:11 PM #1013
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Default Re: DIY Homemade laser diode driver

You could just add a very high value resistor in directly, 50k+ ohms.
It'll discharge the cap when the power is off in about 200-500 ms but will also give so much resistance that when the power is on 99.9% of the current will still go to the LD.

Also, yes, the switch will work
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Old 10-05-2008, 10:43 PM #1014
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Default Re: DIY Homemade laser diode driver

Thanks
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Old 10-06-2008, 02:12 AM #1015
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Default Re: DIY Homemade laser diode driver

I always put a resistor in parallel with the capacitor. Anything above 470 ohms or so does not significantly affect the diode, and will always ensure that the capacitor is drained very quickly. I also use a 47uf cap across my diodes. (Noticed it in your schematic) Using this resistor, you won't kill a diode by forgetting to discharge the capacitor when you change over from test load to real diode.
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Old 10-06-2008, 09:52 PM #1016
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Default Re: DIY Homemade laser diode driver

Not a bad idea
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Old 10-07-2008, 07:42 PM #1017
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Default Re: DIY Homemade laser diode driver

I've got a problem,
when I turn the pot both the voltage and amperage go up (when the 100 ohm pot is at full I get a few miliamps and two volts however when I as I turn the pot the voltage and amperage clime to 3.9v and 300 mA). I am currently testing with an LED but I need this clarified before I move to a laser diode.
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Old 10-07-2008, 08:11 PM #1018
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Default Re: DIY Homemade laser diode driver

Voltage is the force and amps is the flow, they are directly linked so will increase together which is normal. It is suggested to use a chain of diodes with a 1ohm resistor as a test unit as LEDs act differently to LDs and produce incorrect results.

With laser diodes the important one to monitor is the amps
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Old 10-07-2008, 08:37 PM #1019
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Default Re: DIY Homemade laser diode driver

Thank you, I found the schematic a few pages back for the test diode and have a quick question: would a .975 ohm resistor work?
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Old 10-07-2008, 08:50 PM #1020
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Default Re: DIY Homemade laser diode driver

It can work.

The main reason for using a 1ohm was you can test the amount of current passing through it with a volt meter, 100mV across the resistor would mean 100mA through it.
Ohms law -> current = voltage / resistance
So with a 1 ohm resistor you'll always be dividing the voltage by 1 which would give an answer the same as the voltage.

You can still measure the amps with the .975 resistor but you'll need to do some math on your mV result, e.g.
250 mv / .975 ohms = 256.4 mA
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Old 10-07-2008, 09:13 PM #1021
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Default Re: DIY Homemade laser diode driver

got it, thanks
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Old 10-16-2008, 06:45 PM #1022
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Default Re: DIY Homemade laser diode driver

I built this circuit on a breadboard and am trying to test it on a LED but the LED never goes out even when turned to maximum resistance. WHATS WRONG? is my POT bad?
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Old 10-16-2008, 08:51 PM #1023
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Default Re: DIY Homemade laser diode driver

ok, so i've got the DVM and am reading 5.83v on the leads meant for the LD. the value doesn't change when I turn down the POT also, I get NOTHING when
trying to get a reference voltage. please help :-X
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Old 10-16-2008, 08:56 PM #1024
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Default Re: DIY Homemade laser diode driver

wow thats a please ban me forum ID name if ever Iv'e seen one *:-/
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