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Old 02-06-2008, 02:56 AM #177
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Default Re: DIY Laser Power Meter

Quote:
Originally Posted by amkdeath
well, heres my order from futurlec, plz can someone check to see if its all correct?

DPDT101 * * DPDT on-off-on Miniature Toggle Switch *1 *$0.90 $0.90
I think that switch wont be what you want. *It's a on-off-on which is a center off 3 position switch.

I think you want PN# DPDT11


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Old 02-06-2008, 04:26 AM #178
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Default Re: DIY Laser Power Meter

Quote:
Originally Posted by knimrod
[quote author=amkdeath link=1200112201/165#175 date=1202268422]well, heres my order from futurlec, plz can someone check to see if its all correct?

DPDT101 * * DPDT on-off-on Miniature Toggle Switch *1 *$0.90 $0.90
I think that switch wont be what you want. *It's a on-off-on which is a center off 3 position switch.

I think you want PN# DPDT11 [/quote]


DPDT 11 is an on-on switch, dont I want something that will turn my thing on and off???
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Old 02-06-2008, 04:35 AM #179
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Default Re: DIY Laser Power Meter

Quote:
Originally Posted by amkdeath
also, is the rest of the order fine?

can I jsut use 1N914's instead of 1N914/1N4148 because I can find 1N914's everywhere, but I cant find 1N914/1N4148 anywhere
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Old 02-06-2008, 11:14 AM #180
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Default Re: DIY Laser Power Meter

Quote:
Originally Posted by amkdeath
[quote author=knimrod link=1200112201/165#176 date=1202270200][quote author=amkdeath link=1200112201/165#175 date=1202268422]well, heres my order from futurlec, plz can someone check to see if its all correct?

DPDT101 DPDT on-off-on Miniature Toggle Switch 1 $0.90 $0.90
I think that switch wont be what you want. It's a on-off-on which is a center off 3 position switch.

I think you want PN# DPDT11 [/quote]


DPDT 11 is an on-on switch, dont I want something that will turn my thing on and off???[/quote]

You only connect to one side of it, so that when the "other side" is on, nothing is connected to it and it does nothing.
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Old 02-06-2008, 12:20 PM #181
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Default Re: DIY Laser Power Meter

Quote:
Originally Posted by amkdeath
[quote author=amkdeath link=1200112201/165#173 date=1202266290]how hard is it to use these:
http://cgi.ebay.com/ws/eBayISAPI.dll...ype=osi_widget



also, is the rest of the order fine?

can I jsut use 1N914's instead of 1N914/1N4148 because I can find 1N914's everywhere, but I cant find 1N914/1N4148 anywhere[/quote]


I don't think that DPM will work.. It's an LED DPM which means it will draw more current from the battery and it appears to require a separate 5 volt regulated power supply.

Your order looks okay 'cept for the switch.

A 1N914 is exactly the same as a 1N4148. *That's why it's pretty commonly referred to as a 1N914/1N4148. *Either will work.
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Old 02-06-2008, 04:33 PM #182
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Default Re: DIY Laser Power Meter

I ended up competing with "TheMonk" (I recognized his ebay account) for this DPM:
http://cgi.ebay.com/ws/eBayISAPI.dll...TODAY.m238.lVI

I also contacted thier sales and got a different switch, the one you recommended. I also ordered thier 1N914's, which I did find to be the same as thier 1N4148's from thier datasheet.

thanks for the help, all I need now is the Thermopile, LED, Knob, and enclosure! thanks for helping me make this project a go!

regards,

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Old 02-06-2008, 04:40 PM #183
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Default Re: DIY Laser Power Meter

This DPM from the same source appears to be identical except the backlight is blue.. *
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Old 02-06-2008, 05:06 PM #184
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Default Re: DIY Laser Power Meter

all the parts (excluding enclosure, thermopile, DMP, LED, and PCB) came out to around 10 bucks shipped from futurlec, I dont see why people would buy from radio shack...


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Old 02-06-2008, 05:18 PM #185
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Default Re: DIY Laser Power Meter

Quote:
Originally Posted by amkdeath
all the parts (excluding enclosure, thermopile, DMP, LED, and PCB) came out to around 10 bucks shipped from futurlec, I dont see why people would buy from radio shack...

How 'bout because it's a local business that employs local people? You can also have instant gratification by getting your parts in minutes rather than days. If we don't support the local businesses, they will go away.

I've got nothing against mail order but I like being able to get that part I need at a moment's notice...
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Old 02-06-2008, 05:34 PM #186
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Default Re: DIY Laser Power Meter

Quote:
Originally Posted by knimrod
[quote author=amkdeath link=1200112201/180#183 date=1202321217]all the parts (excluding enclosure, thermopile, DMP, LED, and PCB) came out to around 10 bucks shipped from futurlec, I dont see why people would buy from radio shack...

How 'bout because it's a local business that employs local people? *You can also have instant gratification by getting your parts in minutes rather than days. *If we don't support the local businesses, they will go away.

I've got nothing against mail order but I like being able to get that part I need at a moment's notice...[/quote]

you do got a point there, I still go there for electrical "stuff", jsut the DIY parts seem overpriced there. I will stil get my enclosure and LED's from them for this project for sure.

regards,

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Old 02-08-2008, 12:18 PM #187
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Default Re: DIY Laser Power Meter

would a tec thermopile be useful for measuring laser power?
maybe if i put it on a heatsink and paint one side matte black.
I know it would be uncalibrated but would it work and be consistant
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Old 02-08-2008, 11:27 PM #188
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Default Re: DIY Laser Power Meter

The PCBs for the second group buy just arrived (7:30pm) from UPS. I'll get them all mailed out tomorrow.
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Old 02-09-2008, 01:35 AM #189
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Default Re: DIY Laser Power Meter

Quote:
Originally Posted by knimrod
The PCBs for the second group buy just arrived (7:30pm) from UPS. *I'll get them all mailed out tomorrow.

my parts just shipped yesterday, only 1 part left, the thermopile sensor.... lol looks like I left the most important for last...
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Old 02-09-2008, 04:17 AM #190
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Default Re: DIY Laser Power Meter

I just recieved a pm from roSSco, my thermopile sensors have been ordered (Big thanks to roSSco).

knimrod,

Can you put me down for 2 pcbs in the third group buy for the pcb?
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Old 02-09-2008, 07:24 PM #191
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Default Re: DIY Laser Power Meter

Quote:
Originally Posted by woop
would a tec thermopile be useful for measuring laser power?
maybe if i put it on a heatsink and paint one side matte black.
I know it would be uncalibrated but would it work and be consistant

Yes that would work. A small TEC thermal glued to a large piece of aluminium and painted with a mixture of varnish and activated charcoal is said to work.
I don't know about linearity but if you calibrate against known lasers or compare with a proper powermeter it would propably let you know pretty well what power a laser has.
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Old 02-11-2008, 07:22 PM #192
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Default Re: DIY Laser Power Meter

Hi, my first post.
What do you think about a single supply op-amp like the OPA344?
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