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FrozenGate by Avery

DIY Laser Power Meter

amkdeath said:
whats the shipping on those DPM's man?? last I checked the DPM itself was 9.99 before shipping
Click to expand...


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.
 





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

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knimrod said:
This is what I've got so far using the Radio Shack Enclosure...
Click to expand...
where did you find the knob from? ::) I don't see it listed in the parts list.
 
well i have like 6 multimeters so i can connect it to that instead of buying the lcd screen?
 
TheMonk said:
[quote author=knimrod link=1200112201/150#161 date=1202189971]This is what I've got so far using the Radio Shack Enclosure...
Click to expand...
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.
 
knimrod said:
[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...
Click to expand...
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
 
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.
 
Zarniwoop said:
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.
Click to expand...

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.?
 
amkdeath said:
[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.
Click to expand...

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.
 
does your PCB include the zero ofset curcuit and the full schematic etc?
 
amkdeath said:
does your PCB include the zero ofset curcuit and the full schematic etc?
Click to expand...

The zero offset is built into the pcb. The schematic in in this thread. ;)
 
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
orderxo9.jpg
 
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