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Old 02-05-2008, 02:24 AM #161
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Default Re: DIY Laser Power Meter

Quote:
Originally Posted by amkdeath
whats the shipping on those DPM's man?? last I checked the DPM itself was 9.99 before shipping

Their standard flat rate shipping to the US is $9.99. *The auction states it ships from Dublin, Ireland but it will arrive from Hong Kong. *Those DPMs are a bargain at $20.-$25. total. *The last DPM I bought (Jewell) from the usual commercial electronic supply market was over $60. and still not as nice as this one.


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Old 02-05-2008, 04:39 AM #162
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Default Re: DIY Laser Power Meter

This is what I've got so far using the Radio Shack Enclosure...

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DIY Laser Power Meter-lpf_amp_proto2.jpg  
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Old 02-05-2008, 06:46 AM #163
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Default Re: DIY Laser Power Meter

Very nice!

Quote:
Originally Posted by knimrod
This is what I've got so far using the Radio Shack Enclosure...
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Old 02-05-2008, 04:53 PM #164
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Default Re: DIY Laser Power Meter

Quote:
Originally Posted by knimrod
This is what I've got so far using the Radio Shack Enclosure...
where did you find the knob from? : I don't see it listed in the parts list.
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Old 02-05-2008, 07:10 PM #165
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Default Re: DIY Laser Power Meter

well i have like 6 multimeters so i can connect it to that instead of buying the lcd screen?
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Old 02-05-2008, 07:22 PM #166
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Default Re: DIY Laser Power Meter

Quote:
Originally Posted by toked323
well i have like 6 multimeters so i can connect it to that instead of buying the lcd screen?
Absolutely...
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Old 02-05-2008, 07:25 PM #167
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Default Re: DIY Laser Power Meter

Quote:
Originally Posted by TheMonk
[quote author=knimrod link=1200112201/150#161 date=1202189971]This is what I've got so far using the Radio Shack Enclosure...
where did you find the knob from? : I don't see it listed in the parts list.[/quote]

Hah! You missed the big 10K pot under the knob! It's not listed either. Both came from my junk drawer but I'm sure the knob originated from Radio Shack at some point.
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Old 02-05-2008, 08:55 PM #168
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Default Re: DIY Laser Power Meter

Quote:
Originally Posted by knimrod
[quote author=TheMonk link=1200112201/150#163 date=1202234006][quote author=knimrod link=1200112201/150#161 date=1202189971]This is what I've got so far using the Radio Shack Enclosure...
where did you find the knob from? : I don't see it listed in the parts list.[/quote]

Hah! *You missed the big 10K pot under the knob! *It's not listed either. * *Both came from my junk drawer but I'm sure the knob originated from Radio Shack at some point.
[/quote]
The part list listed 2 10k pot, [smiley=smiley.gif]vr1 is a 10k pot on the board and vr2 is under the knob :P
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Old 02-06-2008, 12:22 AM #169
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Default Re: DIY Laser Power Meter

what are the pots for again?
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Old 02-06-2008, 12:42 AM #170
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Default Re: DIY Laser Power Meter

Uh, VR1 is an internal trim-pot to set the gain once (should be set according to Knimrod's nice calculations above), and VR2 (with the knob) is to adjust to 0.0 before a measurement to compensate for stray temperature fluctuations.
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Old 02-06-2008, 12:56 AM #171
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Default Re: DIY Laser Power Meter

Quote:
Originally Posted by Zarniwoop
Uh, VR1 is an internal trim-pot to set the gain once (should be set according to Knimrod's nice calculations above), and VR2 (with the knob) is to adjust to 0.0 before a measurement to compensate for stray temperature fluctuations.
please define "gain" and I saw the calculations, but I didnt know what they were for... heh

and is there any way to mod this and attatch a USB cable, so that we can attatch the meter to a computer and graph output etc.?
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Old 02-06-2008, 01:16 AM #172
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Default Re: DIY Laser Power Meter

Quote:
Originally Posted by amkdeath
[quote author=Zarniwoop link=1200112201/165#169 date=1202262171]Uh, VR1 is an internal trim-pot to set the gain once (should be set according to Knimrod's nice calculations above), and VR2 (with the knob) is to adjust to 0.0 before a measurement to compensate for stray temperature fluctuations.
please define "gain" and I saw the calculations, but I didnt know what they were for... heh

and is there any way to mod this and attatch a USB cable, so that we can attatch the meter to a computer and graph output etc.?[/quote]

"Gain" is for calibrating the output voltage of the amp. to the laser power being measured.

I'm working on an add-on that will be able to send power meter data to a PC for display/logging. No ETA for that yet.
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Old 02-06-2008, 01:26 AM #173
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Default Re: DIY Laser Power Meter

does your PCB include the zero ofset curcuit and the full schematic etc?
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Old 02-06-2008, 01:51 AM #174
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Default Re: DIY Laser Power Meter

how hard is it to use these:
http://cgi.ebay.com/ws/eBayISAPI.dll...ype=osi_widget

also, did I read somewhere that digikey charges handling AND shipping?


EDIT: and would this work, its cheaper than RS: http://www.futurlec.com/Switches/DPDT101.shtml
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Old 02-06-2008, 01:53 AM #175
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Default Re: DIY Laser Power Meter

Quote:
Originally Posted by amkdeath
does your PCB include the zero ofset curcuit and the full schematic etc?
The zero offset is built into the pcb. The schematic in in this thread.
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Old 02-06-2008, 02:27 AM #176
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Default Re: DIY Laser Power Meter

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
ICS8 8 Pin IC Socket 1 $0.04 $0.04
LTC1050 LTC1050 Precision Zero-Drift Op-Amp 1 $4.40 $4.40
POT10K 10K Linear Taper Pot 1 $0.50 $0.50
R001KMF 1kohm 1/4W 1% Metal Film Resistor 1 $0.20 $0.20
R001M14W 1Mohm 1/4W 5% Carbon Film Resistor 1 $0.10 $0.10
R0047K14W 4.7kohm 1/4W 5% Carbon Film Resistor 2 $0.10 $0.20
R047K14W 47kohm 1/4W 5% Carbon Film Resistor 1 $0.10 $0.10
R100R14W 100ohm 1/4W 5% Carbon Film Resistor 2 $0.10 $0.20
TRIM10K 10K 1/2W Min. Horizontal Pot 1 $0.15 $0.15

Subtotal $6.79
Shipping $4.00
Total $10.79
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