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Old 09-28-2007, 12:03 PM #193
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Default Re: Red DIY DVD laser burner.

it's not that important to use thermal epoxy. As a matter of fact in my latest builds I'm not using it at all.


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Old 09-29-2007, 07:11 AM #194
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Default Re: Red DIY DVD laser burner.

just a question here, going to be getting my diodes here soon, and I was wondering kenom have you started adding capacitors to your later dorcy jr burners? If so, which cap would best suit these?
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Old 09-29-2007, 04:06 PM #195
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Default Re: Red DIY DVD laser burner.

it is pretty important to start adding things to this circuit so that your not blowing out diodes. As someone mentioned before, you should place the cap (27 - 33uF) on the diode leads, also to be really safe put a 1N4001 across the diode in reverse. That is from Robk. it's not a bad idea. I'm going to start at minimum using the cap.
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Old 09-30-2007, 06:05 AM #196
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Default Re: Red DIY DVD laser burner.

Ok sounds like I should beable to fit the cap and the rectifier in the little module, but I always thought everyone recommended a 47uF 16volt cap? Also what do you mean about the 1N4001 rectifier in reverse? Do you mean it has a polarity on it? Also here is the 1N4001 at ratshack, not sure on cap yet:
http://www.radioshack.com/product/in...entPage=search
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Old 09-30-2007, 08:07 AM #197
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Default Re: Red DIY DVD laser burner.

For the 1N4001 diode, he probably meant something like this. It's in reverse as to protect the circuit from reversed polarity. Positive current on the top will not pass through it to negative and go to the LD load. But if the circuit polarity was reversed (positive on the bottom), current would flow through the diode (to the top) as a load and not through the LD in reverse protecting it from damaging reverse current.
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Old 09-30-2007, 04:06 PM #198
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Default Re: Red DIY DVD laser burner.

Hey Guys:
Maybe I missed it among all of this info but what is the safest desired current to feed the Kenom Torch LD if we're working with a 5 volt source and a 2.7 voltage drop across the LD. Is a range of between 150 to 200 ma OK AND will it produce a good burner? I'm trying to find the happy median between LD longevity and output power. Thanks.
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Old 09-30-2007, 05:38 PM #199
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Default Re: Red DIY DVD laser burner.

Your looking at the sweet spot about 200-250ma. At that output your going to be gettting a burner and not throwing yoru diode down the tubes. As far as how much the circuit inside the dorcy is concerned your looking at 350-400ma so it's defenitly needing regulation above and beyond what's normally inside the dorcy. I'm contemplating taking the existing driver out and putting in the driver here
http://dealextreme.com/details.dx/sku.3160
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Old 09-30-2007, 06:30 PM #200
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Default Re: Red DIY DVD laser burner.

I think it would work well. It is based on the AMC7135 current regulator. The data sheet follows:

http://www.micro-bridge.com/data/ADD/AMC7135.pdf

Kai also has a version of these:

https://www.kaidomain.com/WEBUI/Prod...px?TranID=1805
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Old 09-30-2007, 06:41 PM #201
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Default Re: Red DIY DVD laser burner.

the one problem I am having with this particular circuit is it requires minimum of 3.6v in and a cr123 battery or 2 AA's or 2AAA's don't equal enough to drive this. Not to mention I'm concerned that 350ma is a bit much for the GB diodes. but since there is sooooo much room on this circuit it should be relatively easy to solder some new stuff on to it. Like a resistor or two.
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Old 09-30-2007, 07:06 PM #202
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Default Re: Red DIY DVD laser burner.

I noticed that too, but it would run fine on three NIMH rechargeable batteries, or alkalines.. or one RCR123 battery.

One would be relatively safe using a protected rechargeable lithium. So if they do keep regulation within 10%, they might be worth a try.

I think the Dorcy Metal Gear might be the perfect candidate for these using NIMH batteries.

It is hard to tell from the pictures, but it does seem to me on most of these there is already a capacitor across the output. So as you said all you would need to add is an additional resistor. It's a shame they don't sell these in fewer quantities so we could test them.
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Old 09-30-2007, 07:11 PM #203
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Default Re: Red DIY DVD laser burner.

Quote:
Originally Posted by Kenom
Your looking at the sweet spot about 200-250ma. At that output your going to be gettting a burner and not throwing yoru diode down the tubes. As far as how much the circuit inside the dorcy is concerned your looking at 350-400ma so it's defenitly needing regulation above and beyond what's normally inside the dorcy. I'm contemplating taking the existing driver out and putting in the driver here
http://dealextreme.com/details.dx/sku.3160
I was just going to limit the current with a resistor in series with the LD, Ken. Then, parallel the 47uf cap. I did not do this the first time, not even the cap when the LD blew.
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Old 09-30-2007, 07:16 PM #204
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Default Re: Red DIY DVD laser burner.

I've got one if ya wanna see better pictures. bah. I'll just post a picture.

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Old 09-30-2007, 07:21 PM #205
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Default Re: Red DIY DVD laser burner.

oh and for anyone interested here is a picture of the original dorcy circuit.

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Old 09-30-2007, 07:28 PM #206
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Default Re: Red DIY DVD laser burner.

Wow...so all the board consists of is the 7135 and a diode. But there is a lot of room on it...looks like a capacitor is needed in addition to a resistor.
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Old 09-30-2007, 07:31 PM #207
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Default Re: Red DIY DVD laser burner.

ok gazoo, take a look at the two pictures and post on the board on the picture where one could solder the resistors and capacitor and then on the original dorcy circuit take a look and see if it can be modified to be variable like daedals circuit.
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Old 09-30-2007, 07:57 PM #208
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Default Re: Red DIY DVD laser burner.

Comparing to the diagram on the data sheet the pinouts of the regulator are as follows.

Looking at it in your picture:

Left Leg = Vdd Or positive in
Middle leg = Ground
Right Leg = Voltage Out

If you follow the traces on the board you will be OK.

Looking at the data sheet again, this thing can run on a minimum of 2.7 volts. Current will be dependent on input voltage. So it would be safe to test it out using a CR123 battery and check the current going to the laser diode. The diode on the circuit board I assume is for polarity protection. All you might need to add is a capacitor across the laser diode.

Regarding the Dorcy circuit, I am sorry but honestly I am not familiar with it so I would have no idea where to begin. :'(
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