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Old 04-11-2009, 02:52 AM #1
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Default PHR-803T *DDL Driver Circuit Question

Hey everyone! I ordered a PHR803T Sled for 14 $ and I am waiting for it to arrive at my house! I built a DDL circuit. If you go to the FAQ, go to the link that brings you to the driver circuit, the one in the green, with a 25-ohm pot. I am afraid that it might kill my diode. I hope that I can get all the help I can get. *

EDIT:

Its working! I am running at around 80 - 100mW.

Here is a link to my new laser topic!


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Old 04-11-2009, 04:08 AM #2
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Default Re: PHR-803T *DDL Driver Circuit Question

Just measure the current output on your driver and make sure it's not too high before connecting the laser diode to it. Make sure to short the leads before soldering the diode on to remove any charge.
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Old 04-11-2009, 04:11 AM #3
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Default Re: PHR-803T *DDL Driver Circuit Question

How exactly is this done? I heard to put like 4 1N4001 Diodes on it or something like that... I need some help because I am new to this laser business.

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Old 04-11-2009, 04:29 AM #4
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Default Re: PHR-803T *DDL Driver Circuit Question

That blurry picture is useless even with the labels. Read this post about dummy loads.
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Old 04-11-2009, 04:41 AM #5
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Default Re: PHR-803T *DDL Driver Circuit Question

Okay, Well sorry about the blurriness. I can blame my camera for that one.

Here is the schematic I am using for my diode. The power supply is actually 9v not 6v.



and a noob-tacular one
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Old 04-11-2009, 07:28 AM #6
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Default Re: PHR-803T *DDL Driver Circuit Question

Put a dummy load where the laser diode would go and measure the current on it.

As for your camera, try stepping back, taking a focused shot, and then crop it down to size.
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Old 04-12-2009, 03:04 AM #7
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Default Re: PHR-803T *DDL Driver Circuit Question

6 1N4001 diodes and a 1 ohm resistor for a Blu-ray, 4 1N4001 diodes and a 1 ohm resistor for a Red
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Old 04-12-2009, 08:01 AM #8
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Default Re: PHR-803T *DDL Driver Circuit Question

Like this.....
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PHR-803T  DDL Driver Circuit Question-test_load01_010.jpg  
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Old 04-16-2009, 03:04 AM #9
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Default Re: PHR-803T *DDL Driver Circuit Question

So, I am new to this, I attach the multimeter to the black and red spots and measure in what? Volts, resistance (ohms,) etc.

Thanks In advance!
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Old 04-16-2009, 03:47 AM #10
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Default Re: PHR-803T *DDL Driver Circuit Question

Quote:
Originally Posted by Clickey
So, I am new to this, I attach the multimeter to the black and red spots and measure in what? Volts, resistance (ohms,) etc.
Measure volts across the 1 ohm resistor.

Then use ohms law to figure out how many amps are going through the resistor, and set your pot for the number of amps you want to drive the laser diode at. *(Hint, for a 1 ohm resistor, Amps = Volts).
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Old 04-16-2009, 09:46 AM #11
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Default Re: PHR-803T *DDL Driver Circuit Question

Quote:
So, I am new to this, I attach the multimeter to the black and red spots and measure in what? Volts, resistance (ohms,) etc. *
I know this has been answered above but could I just point out that the drawing I posted, just above your post, the wording says &quot;connect to driver circuit where laser diode will go&quot; (the picture shows the positive and negative connections for blu ray and red laser diodes). It also shows a meter connected to the circuit, in the correct place, and underneath that is written how the meter is set and what the reading means.
So where it says &quot;measure mv&quot; = meter is set to measure mv.

Again as stated above, using a 1ohm resistor in the test load there is no calculation required, the reading on the meter in mv is equal to the output of the driver in ma.

Regards rog8811
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Old 04-17-2009, 12:35 AM #12
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Default Re: PHR-803T *DDL Driver Circuit Question

thanks this is all I need.
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Old 04-22-2009, 02:49 AM #13
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Default Re: PHR-803T *DDL Driver Circuit Question



YAY ;D
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