Old 02-25-2009, 02:08 PM #33
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Default Re: Dilda Schematic!!!

impressive work, thanks for sharing, +1! :-)

manuel


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Old 02-25-2009, 02:52 PM #34
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Default Re: Dilda Schematic!!!

Quote:
Originally Posted by Kage
[quote author=Benm link=1234431525/16#20 date=1234745246]

Nice to hear you were able to fix them!

What happened to the lasers those boards came out of?
Thanks. *Two are Bluray, two are still red, but with boost regulators for better efficiency. ..

Only, I have just been testing a LDO linear regulator that is cheaper and better than my boost driver! *I'm pretty exited about this one. *I will be posting a schematic of it soon...
[/quote]

A boost regulator? What type of battery are you powering it with then? I'd say its possible to use a more efficient switching regulator with the CR2's (3 or 3.6), but that'd require a buck regulator.

Making a replacement linear regulator should be no problem at all too - there is so much voltage to work with here no smart tricks are required. The only requirement is that it can handle the power - worst case you're looking at 7.2 v supply, 300 mA (or even more?) and 3 volts diode voltage for a total dissipation of about 1 watt... more that such a little transistor in comes with can handle
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Old 02-27-2009, 11:40 PM #35
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Default Re: Dilda Schematic!!!

Quote:
Originally Posted by Krutz
impressive work, thanks for sharing, +1! :-)

manuel
Thanks Manuel

Quote:
Originally Posted by Benm
[quote author=Kage link=1234431525/16#31 date=1235327249][quote author=Benm link=1234431525/16#20 date=1234745246]

Nice to hear you were able to fix them!

What happened to the lasers those boards came out of?
Thanks. Two are Bluray, two are still red, but with boost regulators for better efficiency. ..

Only, I have just been testing a LDO linear regulator that is cheaper and better than my boost driver! I'm pretty exited about this one. I will be posting a schematic of it soon...
[/quote]

A boost regulator? What type of battery are you powering it with then? I'd say its possible to use a more efficient switching regulator with the CR2's (3 or 3.6), but that'd require a buck regulator.

Making a replacement linear regulator should be no problem at all too - there is so much voltage to work with here no smart tricks are required. The only requirement is that it can handle the power - worst case you're looking at 7.2 v supply, 300 mA (or even more?) and 3 volts diode voltage for a total dissipation of about 1 watt... more that such a little transistor in comes with can handle
[/quote]

Sorry for any confusion, the chip is a "boost converter" (LM2731) but I used it in a sepic style circuit with DC blocking. So, you are right, it is not boosting at all, since it runs off 4-10V!

As for the linear regulator - Would you believe - running a red from a SINGLE Li battery? I have a working unit in a Dilda host. It's a Low Dropout Adjustable Linear Regulator running a 6X LCC at 400mA at an average 85% efficiency from a 14500 protected Li-Ion! It runs so cool, the laser can be left on for 15 min at a time. I need to run it with a few different diodes before I post a thread for it, though.. :
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Old 02-28-2009, 12:39 AM #36
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Default Re: Dilda Schematic!!!

Running from a single cell must be very tight, but its doable as long as the cell is 3.6 volts and doesnt go under. Nice thing is you do get very good efficiency when things are this close, probably even better than the sepic/buck does on average over its input range.
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