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Old 07-29-2013, 10:50 PM #33
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Default Re: FlexMod P3 Replacement?

Alright, so I compactified and SMDed the entire board and made it so the whole underside of the board is exposed metal (needs to be isolated from the PSU/diode) but is directly connected to the tab on the device.

Here are links to the .sch and .brd:
Schematic File
Board File

All of the resistors/capacitors are 0603 size (easily solderable by hand, but better to toast it), the opamp has the same pinout as the LM1215 (just didn't have that in my library) and the four set resistors are 1 Ohm each (should each be 2W resistors). This should be safe to run up to 5A or so, especially with a hunk of metal on the bottom side.

Enjoy and comment!


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Old 07-30-2013, 06:01 AM #34
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Default Re: FlexMod P3 Replacement?

I use iteadstudio for PCB's, a hell of a lot cheaper than oshpark.
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Old 07-30-2013, 06:08 AM #35
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Default Re: FlexMod P3 Replacement?

Had no idea. I'll take a look into it.

Hmm. I suppose it is cheaper if you aren't making small boards. OSHpark is really cheap if you need to panelize a ton of tiny boards (my typical case for my drivers).

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Old 07-30-2013, 06:35 AM #36
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Default Re: FlexMod P3 Replacement?

itead allow panelizing, however they won't cut up the boards for you. If you are OK with cutting the boards yourself, itead is extremely cheap.
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Old 07-30-2013, 06:36 AM #37
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Default Re: FlexMod P3 Replacement?

I can't cut circular boards myself!
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Old 07-30-2013, 06:41 AM #38
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Default Re: FlexMod P3 Replacement?

Why are you going circular for an analog driver? They're not really useful in a handheld

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Old 07-30-2013, 06:56 AM #39
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Default Re: FlexMod P3 Replacement?

I was talking about my normal drivers that I do (the BlitzBucks). That's why I am not familiar with anything besides OSHpark! But I don't plan on ordering these in bulk anyway, this was for the forum ^_^
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Old 07-30-2013, 08:23 AM #40
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Default Re: FlexMod P3 Replacement?

Ive used itead and they are great for the price. I like oshpark better though. They both have their ups and downs.
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Old 08-01-2013, 10:52 PM #41
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Default Re: FlexMod P3 Replacement?

would be nice to see live output monitoring like on the die4driver. and possible tec support
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Old 08-01-2013, 11:48 PM #42
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Default Re: FlexMod P3 Replacement?

TEC support would mean another constant current driver, usually capable of TTL. That means, basically, another one of these drivers. Would probably be better to simply make two of these.

As for live output monitoring... I suppose I can look into it?
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Old 08-03-2013, 02:53 PM #43
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Default Re: FlexMod P3 Replacement?

I had planned on building a prototype this week but me free time has not cooperated.. story of my life. Hopefully today or tomorrow I'll get some time to myself..
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Old 08-03-2013, 04:18 PM #44
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Default Re: FlexMod P3 Replacement?

What about using a mosfet for current regulating? An audio amplifier mosfet could be useful there...

Lower dropout...
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Old 08-04-2013, 12:17 AM #45
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Default Re: FlexMod P3 Replacement?

Remember that the major benefit of the Flexmod is not that it incorporates an analog driver -- which isn't that hard to construct -- but rather the circuitry that surrounds the driver: ESD protection, safety interlock, regulated power, etc. Those are the add-ons that make this driver something to look at more than a simple adjustment amp fixed to a current-regulating MOSFET config.
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Old 08-04-2013, 01:36 AM #46
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Default Re: FlexMod P3 Replacement?

Regulated power, i.e. constant power? How would that be beneficial to laser diodes? And yes, I understand that. It is a great circuit. But it's hardly available anymore.
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Old 08-07-2013, 12:21 AM #47
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Default Re: FlexMod P3 Replacement?

interlock and start delay will be needed for sales at pl.

the p3 will be available again at illumination supply soon.
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Old 08-08-2013, 10:02 AM #48
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Default Re: FlexMod P3 Replacement?

I'd say, for best heat properties, if this ever gets mass produced, aluminum core PCB's would be preferrable. Plus, they come with a nice white solder mask.

Also, not sure if completely relevant, but I recently open sourced the source code that I made for the TriniDrive on my GitHub page, so if anybody wants to stuff an ATmega or ATtiny in a handheld (together with this driver) it might be useful with a bit of modification. Heck, with Energia, one could even stuff a MSP430 in a laser like this
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