Sorry, I did it again [miniature]

[Zom-B]

A DDL driver with a large TO-220 LM317 at 200mA, modified to fit into an Aixiz housing. I needed three resistors to get the exact value I wanted. The black rectangle is a cap. The laser diode itself is an infra red emitting 122mW.

Some burnshots

;D

 

[daguin]

**stares in awe**

 

[LikeitBright]

Heh, nice and compact! How are you for heat dissipation?

 

[Benm]

Very compact indeed, though sawing pieces of components off is a bit of cheating

Then again, you can also get the lm317 in a sot-223 or to-263 housing which are rated at up to 1 amp and would probably fit without any brute force...

 

[Hemlock_Mike]

;D ;D ;D Nice bit of doing with what you have on hand

Good work -- Mike

 

[Seoul_lasers]

WOW !! nice going.. I wished I had the time to build those.
GREAT pictures.. very very clear. ;D

 

[Zom-B]

Very compact indeed, though sawing pieces of components off is a bit of cheating

Then again, you can also get the lm317 in a sot-223 or to-263 housing which are rated at up to 1 amp and would probably fit without any brute force...

I had these lying around, and I don't even think my cheap reseller has these components

 

[styropyro]

I think that's a first, putting a DDL circuit in an Aixiz module! I remember when I had trouble fitting a DDL circuit in an MXDL... ;D

 

[rog8811]

Ahem........

Shame was I didn't have a small capacitor and it was an old SenKat red so not as powerful as this one, nice job by the way

Regards rog8811

 

[Rhith]

And to think I had built a small driver before. :

 

[Benm]

Yeah, you got to measure how much space you actually have sometimes.

Also, keep an eye on the thermal side of things when doing builds like these. In a typical 2xCR123A powering a red diode situation, the regulator dissappates about as much heat as the laser diode.

These regulators do work well beyond 100 degrees C, so it isnt usually that big a deal, but temperatures can shoot up quickly in such a small enclosed space. The LM317 will save itself by lowering current though, so that should be noticeable if it becomes problematic.

 

[Zom-B]

Temperature is not a big problem. At 200mA, and closed aixiz, the LM327 becomes about 40 degrees after only 4 minutes. With this kind of duty-cycle, I'm happy. When powering a 20x red at 420ma, that would be another story (and I wouldn't recommend it)

 

[orez]

really cool !!!! you never try smd components ?? maybe that helps

 

[spyrorocks]

 

[Bionic-Badger]

A four-year old necropost? Is this a record?

 

[spyrorocks]

Probably. But its also a good time to bring up 2007Revolution's soldering job.