Old 12-11-2007, 01:47 PM #1
Class 2 Laser
 
Join Date: Nov 2007
Posts: 270
Rep Power: 12
member02 is on a distinguished road
member02 member02 is offline
Class 2 Laser
 
Join Date: Nov 2007
Posts: 270
Rep Power: 12
member02 is on a distinguished road
Default help with circuit  using 7805

I was wondering if someone here could help me design a circuit to drive a senkate diode (i ordered oneafter breaking two 20x diodes that were open can :-/)


member02 is offline   Reply With Quote


















Old 12-11-2007, 02:06 PM #2
happytomato's Avatar
Class 2 Laser
 
Join Date: Nov 2007
Location: Stockholm, Sweden
Posts: 490
Rep Power: 17
happytomato is a name known to allhappytomato is a name known to allhappytomato is a name known to allhappytomato is a name known to allhappytomato is a name known to allhappytomato is a name known to all
happytomato happytomato is offline
Class 2 Laser
happytomato's Avatar
 
Join Date: Nov 2007
Location: Stockholm, Sweden
Posts: 490
Rep Power: 17
happytomato is a name known to allhappytomato is a name known to allhappytomato is a name known to allhappytomato is a name known to allhappytomato is a name known to allhappytomato is a name known to all
Default Re: help with circuit  using 7805

Not a clue, why don't you just use a lm317 ?
happytomato is offline   Reply With Quote
Old 12-11-2007, 04:41 PM #3
rog8811's Avatar
Class 3B Laser
 
Join Date: Jul 2007
Location: Berkshire UK
Posts: 2,749
Rep Power: 1252
rog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond repute
rog8811 rog8811 is offline
Class 3B Laser
rog8811's Avatar
 
Join Date: Jul 2007
Location: Berkshire UK
Posts: 2,749
Rep Power: 1252
rog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond repute
Default Re: help with circuit *using 7805

The 7805 is good for driving Blue rays, if I remember correctly it has a max 100ma output, not high enough for a burner. Also it is no good as a constant current source, as HT says LM317 is the way to go.....

Is there a particular reason you were looking at the 7805?

Regards rog8811
__________________
See all of my videos on Vimeo
http://www.vimeo.com/4454150

Lots of tutorials and information on lasers
http://www.rog8811.com/

In the land of the blind the one eyed man..... is most likely holding the laser
rog8811 is offline   Reply With Quote
Old 12-11-2007, 06:53 PM #4
Gazoo's Avatar
Class 3B Laser
 
Join Date: Jun 2007
Location: Dallas Tx
Posts: 3,199
Rep Power: 1336
Gazoo has a reputation beyond reputeGazoo has a reputation beyond reputeGazoo has a reputation beyond reputeGazoo has a reputation beyond reputeGazoo has a reputation beyond reputeGazoo has a reputation beyond reputeGazoo has a reputation beyond reputeGazoo has a reputation beyond reputeGazoo has a reputation beyond reputeGazoo has a reputation beyond reputeGazoo has a reputation beyond repute
Gazoo Gazoo is offline
Class 3B Laser
Gazoo's Avatar
 
Join Date: Jun 2007
Location: Dallas Tx
Posts: 3,199
Rep Power: 1336
Gazoo has a reputation beyond reputeGazoo has a reputation beyond reputeGazoo has a reputation beyond reputeGazoo has a reputation beyond reputeGazoo has a reputation beyond reputeGazoo has a reputation beyond reputeGazoo has a reputation beyond reputeGazoo has a reputation beyond reputeGazoo has a reputation beyond reputeGazoo has a reputation beyond reputeGazoo has a reputation beyond repute
Default Re: help with circuit  using 7805

member02,

They do make the 7805 in the same package as the 317. So it would provide enough current to drive the reds. However the 7805 sucks as a current regulator. Used as a voltage regulator it is fine to use with the blu-rays....but I would not touch it for use with the reds. The 317 is the way to go. Of course there are a few other driver options which can easily be found by looking through the Experiments and Mods section.
Gazoo is offline   Reply With Quote
Old 12-11-2007, 11:22 PM #5
Class 2 Laser
 
Join Date: Nov 2007
Posts: 270
Rep Power: 12
member02 is on a distinguished road
member02 member02 is offline
Class 2 Laser
 
Join Date: Nov 2007
Posts: 270
Rep Power: 12
member02 is on a distinguished road
Default Re: help with circuit *using 7805

oh, i guess i'll just save it for the blus then, i was just curious, mainly because i noticed my "3.6v" surfire 123a's were reading 2.93v fresh from the packaging, which led me to wonder if that, coupled with the lm317t getting a less than 6v source, have damaged my last laser diode?
member02 is offline   Reply With Quote
Old 12-14-2007, 08:37 PM #6
Class 3R Laser
 
Join Date: Sep 2007
Posts: 1,591
Rep Power: 97
toked323 has a reputation beyond reputetoked323 has a reputation beyond reputetoked323 has a reputation beyond reputetoked323 has a reputation beyond reputetoked323 has a reputation beyond reputetoked323 has a reputation beyond reputetoked323 has a reputation beyond reputetoked323 has a reputation beyond reputetoked323 has a reputation beyond reputetoked323 has a reputation beyond reputetoked323 has a reputation beyond repute
toked323 toked323 is offline
Class 3R Laser
 
Join Date: Sep 2007
Posts: 1,591
Rep Power: 97
toked323 has a reputation beyond reputetoked323 has a reputation beyond reputetoked323 has a reputation beyond reputetoked323 has a reputation beyond reputetoked323 has a reputation beyond reputetoked323 has a reputation beyond reputetoked323 has a reputation beyond reputetoked323 has a reputation beyond reputetoked323 has a reputation beyond reputetoked323 has a reputation beyond reputetoked323 has a reputation beyond repute
Default Re: help with circuit  using 7805

i use the 7135 drive from dealextreme and i used it with just a cap on a senkat diode and boy it was bright , i only run the diode 2 minutes at a time though
toked323 is offline   Reply With Quote
Reply





Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



























Privacy Policy | Advertising Disclaimer | Terms of Use


 


All times are GMT. The time now is 02:59 AM.


Powered by: vBulletin
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO
Privacy Policy | Advertising Disclaimer | Terms of Use
Copyright (C) 2017 Laser Pointer Forums, LLC