Laser pointer discussion. Read/write reviews of laser pointers and laser pointer companies. Learn about all types of laser pointers and lasers





Welcome to Laser Pointer Forums! If you are looking for a laser pointer or want to compare different laser pointer companies, you may want to check out the LPF Laser Pointer Company Database. The link will open in a new window for your convenience.








Green Laser Pointers by Category Blue Laser Pointers by Category Red Laser Pointers by Category
Yellow Laser Pointers by Category Violet Laser Pointers by Category Orange Laser Pointers by Category
Top Laser Pointers by Power - 1 Watt+ Top Laser Pointers by Power - 500mW+ Top Laser Pointers by Power - 250mW+
Laser Pointer Database High Power Laser Pointers Laser Pointer Diodes
Laser Technology Laser Pointer Parts Lasers by Wavelength
Top 10 Laser Pointer Companies Laser Pointer Company Database Visible Beam Laser Pointers


One laser store meets all your needs

























Go Back   Laser Pointer Forums - Discuss Laser Pointers > Lasers > Tutorials, Help & Repairs



LPF List of Laser Pointer Companies (link opens new window)



Reply
 
LinkBack Thread Tools Display Modes
Old 08-24-2011, 07:25 AM #1
whitewhidow's Avatar
Class 1M Laser
 
Join Date: Aug 2011
Location: Belgium
Posts: 186
Rep Power: 8
whitewhidow will become famous soon enoughwhitewhidow will become famous soon enough
whitewhidow whitewhidow is offline
Class 1M Laser
whitewhidow's Avatar
 
Join Date: Aug 2011
Location: Belgium
Posts: 186
Rep Power: 8
whitewhidow will become famous soon enoughwhitewhidow will become famous soon enough
Default will this diy driver work for this diode?

Hi there,

i found these diagrams here:



Will i be able to use this to power this diode:
PHR-805 HD diode OEM 405nm !!! HIGH POWER !! [PHR805] - $16.99 : StoneTek Electronics, Your Laser Parts Store

this driver should put out 125mA, wich would bring the diode to about 130mw
is this correct?

the driver sayes it needs 7.2 volt, is this correct?, what battery's woould i use for this .

Do i need a glass lens, or will the regular aixiz one do?

Thx in advance


__________________
ARE U SELLING?

^LIST YOUR ITEMS FOR FREE^
whitewhidow is offline   Reply With Quote







LPF List of Laser Pointer Companies (link opens new window)







Old 08-24-2011, 12:27 PM #2
lasersbee's Avatar
Class 4 Laser
 
Join Date: Sep 2008
Location: Quebec, Canada
Posts: 15,847
Rep Power: 45795
lasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond repute
lasersbee lasersbee is offline
Class 4 Laser
lasersbee's Avatar
 
Join Date: Sep 2008
Location: Quebec, Canada
Posts: 15,847
Rep Power: 45795
lasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond repute
Default Re: will this diy driver work for this diode?

Quote:
Originally Posted by whitewhidow View Post
Hi there,

i found these diagrams here:



Will i be able to use this to power this diode:
PHR-805 HD diode OEM 405nm !!! HIGH POWER !! [PHR805] - $16.99 : StoneTek Electronics, Your Laser Parts Store

this driver should put out 125mA, wich would bring the diode to about 130mw
is this correct?

the driver sayes it needs 7.2 volt, is this correct?, what battery's woould i use for this .

Do i need a glass lens, or will the regular aixiz one do?

Thx in advance
You'll need to do a little more research on the Forum....
your questions have been answered many times before...

You require at least 7.2Volts for the input of a Linear
Current adjustable Laser Diode Driver to supply the
405nm LD in question.

You can use 2pc 3.6V or 3.7V batteries to run that driver.
At 130mW you will be fine with an acrylic lens...


Jerry
__________________

J.BAUER Electronics Home Page

LaserBee Laser Power Meter Products meet your needs
at affordable Prices:
See them all here on LPF

LaserBee Power Meter products ALWAYS in Stock
and ready to ship

Also available on eBay:Check availability here..

Subsidary: Pharma Electronic Solutions


This banner is available to and can be copied/used FREE by any LaserBee owner
lasersbee is offline   Reply With Quote
Old 08-24-2011, 12:33 PM #3
whitewhidow's Avatar
Class 1M Laser
 
Join Date: Aug 2011
Location: Belgium
Posts: 186
Rep Power: 8
whitewhidow will become famous soon enoughwhitewhidow will become famous soon enough
whitewhidow whitewhidow is offline
Class 1M Laser
whitewhidow's Avatar
 
Join Date: Aug 2011
Location: Belgium
Posts: 186
Rep Power: 8
whitewhidow will become famous soon enoughwhitewhidow will become famous soon enough
Default Re: will this diy driver work for this diode?

yes, i was pretty sure about averything, but i figured i'd ask to make sure.

And when people like yourself confirm this, then atleast im 100% sure.

So 2x18650 would be fine, would it be a problem hooking this up to a 9V battery? would i need to make changes to the driver?

also what kind of dummy load do i use for this ? how many diodes, i see people saying different stuff as far as the dummy load goes; would i use 6 1n4001 diodes for this ?
Blu ray laser diode ~4.5v (6 diodes X 0.7 =4.3)
but this is for a 803t ? does the 805 require the same voltage?

Thx again laserbee
__________________
ARE U SELLING?

^LIST YOUR ITEMS FOR FREE^
whitewhidow is offline   Reply With Quote
Old 08-24-2011, 12:39 PM #4
lasersbee's Avatar
Class 4 Laser
 
Join Date: Sep 2008
Location: Quebec, Canada
Posts: 15,847
Rep Power: 45795
lasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond repute
lasersbee lasersbee is offline
Class 4 Laser
lasersbee's Avatar
 
Join Date: Sep 2008
Location: Quebec, Canada
Posts: 15,847
Rep Power: 45795
lasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond repute
Default Re: will this diy driver work for this diode?

The 405nm LDs require the same voltage drop
across the LD to Lase.. They are essentially the same.

Yes... 6 Recitfier Diodes and a 1 Ohm resistor will do the
trick for a Dummy Test Load...

A standard 9Volt batter could be used but it would drain
rather quickly..


Jerry
__________________

J.BAUER Electronics Home Page

LaserBee Laser Power Meter Products meet your needs
at affordable Prices:
See them all here on LPF

LaserBee Power Meter products ALWAYS in Stock
and ready to ship

Also available on eBay:Check availability here..

Subsidary: Pharma Electronic Solutions


This banner is available to and can be copied/used FREE by any LaserBee owner

Last edited by lasersbee; 08-25-2011 at 04:58 PM. Reason: Data Error fixed Opps..
lasersbee is offline   Reply With Quote
Old 08-24-2011, 12:43 PM #5
whitewhidow's Avatar
Class 1M Laser
 
Join Date: Aug 2011
Location: Belgium
Posts: 186
Rep Power: 8
whitewhidow will become famous soon enoughwhitewhidow will become famous soon enough
whitewhidow whitewhidow is offline
Class 1M Laser
whitewhidow's Avatar
 
Join Date: Aug 2011
Location: Belgium
Posts: 186
Rep Power: 8
whitewhidow will become famous soon enoughwhitewhidow will become famous soon enough
Default Re: will this diy driver work for this diode?

Quote:
Originally Posted by lasersbee View Post
The 405nm LDs require the same voltage drop
across the LD to Lase.. They are essentially the same.

Yes... 6 LDs and a 1 Ohm resistor will do the trick for
a Dummy Test Load...

A standard 9Volt batter could be used but it would drain
rather quickly..


Jerry
would the 9v still give me a correct reading on the dummy load ?


edit: just found this: (coming from same page as the diagram and other info in this post)
Quote:
Voltage needed by red LD 3v

Voltage needed by regulator to make it work 3v

Additional voltage to get long life between battery changes 1.2v.

Add that up and you get 7.2volts,

For a Blu-ray the LD needs 4.5v

Voltage needed by regulator to make it work 3v

Additional voltage to get long life between battery changes 1.2v.

Add that up and you get 9.0volts.
So i would NEED 9v? 7.2 would not cut it? is this correct?

how would i do this? 3x cr123?
__________________
ARE U SELLING?

^LIST YOUR ITEMS FOR FREE^

Last edited by whitewhidow; 08-24-2011 at 12:51 PM.
whitewhidow is offline   Reply With Quote
Old 08-24-2011, 01:23 PM #6
Class 1M Laser
 
Join Date: Feb 2011
Location: 20 Miles South of the Nations Capital - in Maryland, close to the Potomac River
Posts: 130
Rep Power: 14
Cad602 is a splendid one to beholdCad602 is a splendid one to beholdCad602 is a splendid one to beholdCad602 is a splendid one to beholdCad602 is a splendid one to beholdCad602 is a splendid one to beholdCad602 is a splendid one to behold
Cad602 Cad602 is offline
Class 1M Laser
 
Join Date: Feb 2011
Location: 20 Miles South of the Nations Capital - in Maryland, close to the Potomac River
Posts: 130
Rep Power: 14
Cad602 is a splendid one to beholdCad602 is a splendid one to beholdCad602 is a splendid one to beholdCad602 is a splendid one to beholdCad602 is a splendid one to beholdCad602 is a splendid one to beholdCad602 is a splendid one to behold
Default Re: will this diy driver work for this diode?

I've used 9volts before with mixed results - it drained so fast once that I changed the resistor in my driver - but I also changed the battery and *poof* -$40...I then used two 9V's in parallel and it worked a little better - But, I couldn't get the current I needed consistently, so I went and used two banks of 6AA's in parallel for my power supply then set the current - until I could get some 18650's....
That worked very well actually. It's a brick, almost portable, but it works well and delivers the needed current.

As long as the 9v's are fresh you should be okay on the dummy load..I would still get as much potential current on hand before setting the LM317...(2 or more in parallel?) but maybe it doesn't matter - ugh, Jerry?

cad602
__________________
Mah Favorites ("weak" ones not listed)
445nm - from scratch - in a Home Made Host - 1.2W
532nm O-Like 200mW Transformable / Adjustable - Sometimes it's up to 240mW stable and sometimes it's 204mW stable?WTF?
405nm 12x - from scratch - in an Ultra Fire WF-501B Host - 353mW
635-660nm Red Laser Module (focusable dot) 3-5V W/Built in Driver Circuit in Home Made Host 220mW+
635nm - "300mW" Mitsubishi diode in Module w/flex by DTR (in temp host) - 454mW

My Best Friend & Laser Power Meter - LaserBee 2.5W USB

Last edited by Cad602; 08-24-2011 at 03:43 PM.
Cad602 is offline   Reply With Quote
Old 08-24-2011, 01:30 PM #7
whitewhidow's Avatar
Class 1M Laser
 
Join Date: Aug 2011
Location: Belgium
Posts: 186
Rep Power: 8
whitewhidow will become famous soon enoughwhitewhidow will become famous soon enough
whitewhidow whitewhidow is offline
Class 1M Laser
whitewhidow's Avatar
 
Join Date: Aug 2011
Location: Belgium
Posts: 186
Rep Power: 8
whitewhidow will become famous soon enoughwhitewhidow will become famous soon enough
Default Re: will this diy driver work for this diode?

this is exactly the reason i ask these questions here, i dont want that *poof* to happen
__________________
ARE U SELLING?

^LIST YOUR ITEMS FOR FREE^
whitewhidow is offline   Reply With Quote
Old 08-24-2011, 02:19 PM #8
jib77's Avatar
Class 2M Laser
 
Join Date: Jun 2010
Location: DFW, TX
Posts: 718
Rep Power: 38
jib77 has a reputation beyond reputejib77 has a reputation beyond reputejib77 has a reputation beyond reputejib77 has a reputation beyond reputejib77 has a reputation beyond reputejib77 has a reputation beyond reputejib77 has a reputation beyond reputejib77 has a reputation beyond reputejib77 has a reputation beyond reputejib77 has a reputation beyond reputejib77 has a reputation beyond repute
jib77 jib77 is offline
Class 2M Laser
jib77's Avatar
 
Join Date: Jun 2010
Location: DFW, TX
Posts: 718
Rep Power: 38
jib77 has a reputation beyond reputejib77 has a reputation beyond reputejib77 has a reputation beyond reputejib77 has a reputation beyond reputejib77 has a reputation beyond reputejib77 has a reputation beyond reputejib77 has a reputation beyond reputejib77 has a reputation beyond reputejib77 has a reputation beyond reputejib77 has a reputation beyond reputejib77 has a reputation beyond repute
Default Re: will this diy driver work for this diode?

Use a LM1117 instead of the LD317, it only requires about 1.2V over the diode voltage instead of 3V. But you will need to replace the electrolytic capacitor with a *ceramic* 10uF 10V or 16V for stability(example: TDK part# FK24Y5V1A106Z).
__________________

50mW O-Like New Pocket Greenie OLCGL50

100mW+ PHR/MicroBoost V1/Jayrob Chrome Pocket Mini (140mA)
445nm, Flexdrive V5, Ehgemus 18650 Polished Host (Murdered )
445nm, JibDrive 1.2A, Ehgemus 1x26650 Alien Host
LCC Red 200mW in Custom Ehgemus CR123A Host

FS - My cheap LM1117 driver: >>LINK<<

Cheap PCB prototypes: >>LINK<<


レイセーたちはすごいですよ。
jib77 is offline   Reply With Quote
Old 08-24-2011, 02:26 PM #9
whitewhidow's Avatar
Class 1M Laser
 
Join Date: Aug 2011
Location: Belgium
Posts: 186
Rep Power: 8
whitewhidow will become famous soon enoughwhitewhidow will become famous soon enough
whitewhidow whitewhidow is offline
Class 1M Laser
whitewhidow's Avatar
 
Join Date: Aug 2011
Location: Belgium
Posts: 186
Rep Power: 8
whitewhidow will become famous soon enoughwhitewhidow will become famous soon enough
Default Re: will this diy driver work for this diode?

Quote:
Originally Posted by jib77 View Post
Use a LM1117 instead of the LD317, it only requires about 1.2V over the diode voltage instead of 3V. But you will need to replace the electrolytic capacitor with a *ceramic* 10uF 10V or 16V for stability(example: TDK part# FK24Y5V1A106Z).
so if i make these changes, this would still require 4.5 + 1.2 + 1.2 volts

correct?

What batteries would i use.?

thx jib, im "new" here, but from what i can gather u are one of the driver specialists here.?

EDIT: from the original page, i am now confused, in the circuit i posted earlier, should i use a microfarad or 10 millifarad cap (in the drawing it sais mfd, but i believe the circuit actually calls for 10 microfarad?)
__________________
ARE U SELLING?

^LIST YOUR ITEMS FOR FREE^

Last edited by whitewhidow; 08-24-2011 at 02:29 PM.
whitewhidow is offline   Reply With Quote
Old 08-24-2011, 03:33 PM #10
Cyparagon's Avatar
Class 4 Laser
 
Join Date: Sep 2007
Location: Wisconsin
Posts: 9,146
Rep Power: 9765
Cyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond repute
Cyparagon Cyparagon is online now
Class 4 Laser
Cyparagon's Avatar
 
Join Date: Sep 2007
Location: Wisconsin
Posts: 9,146
Rep Power: 9765
Cyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond repute
Default Re: will this diy driver work for this diode?

Quote:
Originally Posted by jib77 View Post
Use a LM1117 instead of the LD317, it only requires about 1.2V over the diode voltage
Plus the Reference voltage of 1.25V. (you are running it in constant current configuration, right?)
__________________
A problem well stated is a problem half solved.
Cyparagon is online now   Reply With Quote
Old 08-24-2011, 03:58 PM #11
jib77's Avatar
Class 2M Laser
 
Join Date: Jun 2010
Location: DFW, TX
Posts: 718
Rep Power: 38
jib77 has a reputation beyond reputejib77 has a reputation beyond reputejib77 has a reputation beyond reputejib77 has a reputation beyond reputejib77 has a reputation beyond reputejib77 has a reputation beyond reputejib77 has a reputation beyond reputejib77 has a reputation beyond reputejib77 has a reputation beyond reputejib77 has a reputation beyond reputejib77 has a reputation beyond repute
jib77 jib77 is offline
Class 2M Laser
jib77's Avatar
 
Join Date: Jun 2010
Location: DFW, TX
Posts: 718
Rep Power: 38
jib77 has a reputation beyond reputejib77 has a reputation beyond reputejib77 has a reputation beyond reputejib77 has a reputation beyond reputejib77 has a reputation beyond reputejib77 has a reputation beyond reputejib77 has a reputation beyond reputejib77 has a reputation beyond reputejib77 has a reputation beyond reputejib77 has a reputation beyond reputejib77 has a reputation beyond repute
Default Re: will this diy driver work for this diode?

Quote:
Originally Posted by Cyparagon View Post
Plus the Reference voltage of 1.25V. (you are running it in constant current configuration, right?)
Nope ... 1.25 is all. LDOs like the LM1117 work a little bit differently because of the internal transistor setup, they do not require the overhead of normal regulators. That's what makes them low drop out.

Quote:
Originally Posted by whitewhidow View Post
from the original page, i am now confused, in the circuit i posted earlier, should i use a microfarad or 10 millifarad cap (in the drawing it sais mfd, but i believe the circuit actually calls for 10 microfarad?)
Just use 10 microfarads (10uF). That is all that is needed for a stable driver. Use 2 li-ion cells like 16340's or 18650's.
__________________

50mW O-Like New Pocket Greenie OLCGL50

100mW+ PHR/MicroBoost V1/Jayrob Chrome Pocket Mini (140mA)
445nm, Flexdrive V5, Ehgemus 18650 Polished Host (Murdered )
445nm, JibDrive 1.2A, Ehgemus 1x26650 Alien Host
LCC Red 200mW in Custom Ehgemus CR123A Host

FS - My cheap LM1117 driver: >>LINK<<

Cheap PCB prototypes: >>LINK<<


レイセーたちはすごいですよ。

Last edited by jib77; 08-24-2011 at 04:03 PM.
jib77 is offline   Reply With Quote
Old 08-24-2011, 09:09 PM #12
Cyparagon's Avatar
Class 4 Laser
 
Join Date: Sep 2007
Location: Wisconsin
Posts: 9,146
Rep Power: 9765
Cyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond repute
Cyparagon Cyparagon is online now
Class 4 Laser
Cyparagon's Avatar
 
Join Date: Sep 2007
Location: Wisconsin
Posts: 9,146
Rep Power: 9765
Cyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond repute
Default Re: will this diy driver work for this diode?

Only if you use it as a voltage regulator. According to the datasheet, there's a reference voltage of 1.25V you're forgetting about in addition to the 1.2V. This is dropped across the sense resistor.
__________________
A problem well stated is a problem half solved.

Last edited by Cyparagon; 08-24-2011 at 09:11 PM.
Cyparagon is online now   Reply With Quote
Old 08-24-2011, 10:21 PM #13
chipdouglas's Avatar
Class 3B Laser
 
Join Date: Dec 2008
Location: Riverside, California
Posts: 4,011
Rep Power: 347
chipdouglas has a reputation beyond reputechipdouglas has a reputation beyond reputechipdouglas has a reputation beyond reputechipdouglas has a reputation beyond reputechipdouglas has a reputation beyond reputechipdouglas has a reputation beyond reputechipdouglas has a reputation beyond reputechipdouglas has a reputation beyond reputechipdouglas has a reputation beyond reputechipdouglas has a reputation beyond reputechipdouglas has a reputation beyond repute
Send a message via Yahoo to chipdouglas
chipdouglas chipdouglas is offline
Class 3B Laser
chipdouglas's Avatar
 
Join Date: Dec 2008
Location: Riverside, California
Posts: 4,011
Rep Power: 347
chipdouglas has a reputation beyond reputechipdouglas has a reputation beyond reputechipdouglas has a reputation beyond reputechipdouglas has a reputation beyond reputechipdouglas has a reputation beyond reputechipdouglas has a reputation beyond reputechipdouglas has a reputation beyond reputechipdouglas has a reputation beyond reputechipdouglas has a reputation beyond reputechipdouglas has a reputation beyond reputechipdouglas has a reputation beyond repute
Send a message via Yahoo to chipdouglas
Default Re: will this diy driver work for this diode?

9vdc is a good voltage. 7.2vdc is the min.

9vdc via rectangular batt is not good. not enough capacity

7.2vdc is the min. if you have a good power source like a plug in unit.

7.2vdc is too low if you are using batteries because they will fall out of regulation under load.

3.6/3.7vdc batts x 2 work because at full charge they put out 4.2vdc for a total of 8.4vdc

michael.
__________________
IN A CONSTANT STATE OF PICNIC

I AM THE STATUS QUO

ARE YOU A NEW MEMBER, OR EVEN MORE, ARE YOU NEW TO ONLINE FORUMS... READ THIS
LASER POINTER FORUM ETIQUETTE


for pot modding facts click below

http://laserpointerforums.com/f51/pot-modding-faqs-40510.html
chipdouglas is offline   Reply With Quote
Old 08-25-2011, 12:51 AM #14
jib77's Avatar
Class 2M Laser
 
Join Date: Jun 2010
Location: DFW, TX
Posts: 718
Rep Power: 38
jib77 has a reputation beyond reputejib77 has a reputation beyond reputejib77 has a reputation beyond reputejib77 has a reputation beyond reputejib77 has a reputation beyond reputejib77 has a reputation beyond reputejib77 has a reputation beyond reputejib77 has a reputation beyond reputejib77 has a reputation beyond reputejib77 has a reputation beyond reputejib77 has a reputation beyond repute
jib77 jib77 is offline
Class 2M Laser
jib77's Avatar
 
Join Date: Jun 2010
Location: DFW, TX
Posts: 718
Rep Power: 38
jib77 has a reputation beyond reputejib77 has a reputation beyond reputejib77 has a reputation beyond reputejib77 has a reputation beyond reputejib77 has a reputation beyond reputejib77 has a reputation beyond reputejib77 has a reputation beyond reputejib77 has a reputation beyond reputejib77 has a reputation beyond reputejib77 has a reputation beyond reputejib77 has a reputation beyond repute
Default Re: will this diy driver work for this diode?

Quote:
Originally Posted by Cyparagon View Post
Only if you use it as a voltage regulator. According to the datasheet, there's a reference voltage of 1.25V you're forgetting about in addition to the 1.2V. This is dropped across the sense resistor.
1.25V is all the overhead it needs and its only that high because it is needed for Vref in the feedback loop comparator. The reason the LM317 requires 3V overhead is because it is powering a Darlington array of transistors, where as a LDO is only using a single PNP transistor.
__________________

50mW O-Like New Pocket Greenie OLCGL50

100mW+ PHR/MicroBoost V1/Jayrob Chrome Pocket Mini (140mA)
445nm, Flexdrive V5, Ehgemus 18650 Polished Host (Murdered )
445nm, JibDrive 1.2A, Ehgemus 1x26650 Alien Host
LCC Red 200mW in Custom Ehgemus CR123A Host

FS - My cheap LM1117 driver: >>LINK<<

Cheap PCB prototypes: >>LINK<<


レイセーたちはすごいですよ。
jib77 is offline   Reply With Quote
Old 08-25-2011, 07:51 AM #15
whitewhidow's Avatar
Class 1M Laser
 
Join Date: Aug 2011
Location: Belgium
Posts: 186
Rep Power: 8
whitewhidow will become famous soon enoughwhitewhidow will become famous soon enough
whitewhidow whitewhidow is offline
Class 1M Laser
whitewhidow's Avatar
 
Join Date: Aug 2011
Location: Belgium
Posts: 186
Rep Power: 8
whitewhidow will become famous soon enoughwhitewhidow will become famous soon enough
Default Re: will this diy driver work for this diode?

that all makes about as much sense to me as that last line in your sig
__________________
ARE U SELLING?

^LIST YOUR ITEMS FOR FREE^
whitewhidow is offline   Reply With Quote
Old 08-25-2011, 04:38 PM #16
BShanahan14rulz's Avatar
Class 3B Laser
 
Join Date: Dec 2009
Posts: 3,175
Rep Power: 264
BShanahan14rulz has a reputation beyond reputeBShanahan14rulz has a reputation beyond reputeBShanahan14rulz has a reputation beyond reputeBShanahan14rulz has a reputation beyond reputeBShanahan14rulz has a reputation beyond reputeBShanahan14rulz has a reputation beyond reputeBShanahan14rulz has a reputation beyond reputeBShanahan14rulz has a reputation beyond reputeBShanahan14rulz has a reputation beyond reputeBShanahan14rulz has a reputation beyond reputeBShanahan14rulz has a reputation beyond repute
BShanahan14rulz BShanahan14rulz is offline
Class 3B Laser
BShanahan14rulz's Avatar
 
Join Date: Dec 2009
Posts: 3,175
Rep Power: 264
BShanahan14rulz has a reputation beyond reputeBShanahan14rulz has a reputation beyond reputeBShanahan14rulz has a reputation beyond reputeBShanahan14rulz has a reputation beyond reputeBShanahan14rulz has a reputation beyond reputeBShanahan14rulz has a reputation beyond reputeBShanahan14rulz has a reputation beyond reputeBShanahan14rulz has a reputation beyond reputeBShanahan14rulz has a reputation beyond reputeBShanahan14rulz has a reputation beyond reputeBShanahan14rulz has a reputation beyond repute
Default Re: will this diy driver work for this diode?

Quote:
Originally Posted by chipdouglas View Post
9vdc is a good voltage. 7.2vdc is the min.

9vdc via rectangular batt is not good. not enough capacity

7.2vdc is the min. if you have a good power source like a plug in unit.

7.2vdc is too low if you are using batteries because they will fall out of regulation under load.

3.6/3.7vdc batts x 2 work because at full charge they put out 4.2vdc for a total of 8.4vdc

michael.
Yeah, but 7.2V input is 2x3.6V, and at 3.6V, it's time to recharge your batteries, after which you will have 8.4V.
BShanahan14rulz 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











Loading








Green Laser Pointers by Category Blue Laser Pointers by Category Red Laser Pointers by Category
Yellow Laser Pointers by Category Violet Laser Pointers by Category Orange Laser Pointers by Category
Top Laser Pointers by Power - 1 Watt+ Top Laser Pointers by Power - 500mW+ Top Laser Pointers by Power - 250mW+
Laser Pointer Database High Power Laser Pointers Laser Pointer Diodes






Privacy Policy | Advertising Disclaimer | Terms of Use


 


All times are GMT. The time now is 03:24 AM.


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