I don't know of a 940 nm laser or LED assembly like below but individual LEDs are not expensive:
http://www.futurlec.com/LEDInfrared.shtml You may want to check these out. They are most likely 850 nm. http://www.dealextreme.com/products.dx/category.913 http://www.mcmelectronics.com/product/28-8070 - Steve N From: Garrick [mailto:[email protected]] Sent: Thursday, May 20, 2010 4:00 PM To: [email protected] Subject: Re: CS>Lasers and thinning hair - low cost options and DIY info Thanks for all that information on do it yourself laser. Do you see a 940 nm laser LED that you could do the same thing with? 940 goes deeper into joints for joints tendons arthritis etc. . Biobeam sells a 940 and a 660 Thanks Garrick On Thu, May 20, 2010 at 1:35 PM, Norton, Steve <[email protected]> wrote: I know I did not provide ant DIY info on my previous post but time was short. So here is a little help if you want to make your own low cost unit. You can easily make a good unit within your 30.00 budget. For easy of assembly I would recommend using http://www.futurlec.com/LED/LEDCLR15.shtml at a cost of $2.90 plus $4.00 shipping. The power supply I show later can power up to 7 of the modules so you can get more of them if you want to be able to radiate a larger area at once. Or if radiating fingers, you could radiate both sides of your finger(s) simultaneously. If you look online, many commercial units use 630 nm LEDs. That wavelength gives up a very little in penetration depth vs 660 nm while reportedly being more effective for healing than 660 nm or the higher frequency wavelengths. I know that laser diodes get more press (and cost more) than LED based units but I don't think that the lasers provide better performance. The unit above has 15 LEDs that operate at 15 ma at 2 volts. That means that each LED uses 30 milliwatts (mW) of power. Conversion efficiencies of a red Led is normally in the 45 - 50% range for current technology low power LEDs. The red laser diodes in laser pointers are usually around 10 mW output. So you would only need a conversion efficiency of 33.3% for 1 LED to get out the same amount of light as a laser pointer. That means that with 33.3% conversion efficiency the module above gives as much light output as 15 laser pointers. Not too shabby. Much older red LEDs had a conversion efficiency of only around 20%. If the LEDs in the module are those old LEDs, it will still provide as much light as 9 laser pointers. Sill not too shabby. And at a much lower cost. Now on to the power supply. 15 volts is not a convenient voltage for batteries although you could use two 9V batteries to get 18V and then use a series resistor to limit the current to 30 ma. But I would recommend buying a 15V plug in power supply. One is available at American Science & Surplus for $3.50. Adapter # 22752. See: http://www.sciplus.com/singleItem.cfm/terms/3850 However AS&S has a minimum purchase of 10.00 so you will need to buy some additional items to get to the $10.00 minimum. Maybe you could use some additional laser pointers: http://www.sciplus.com/search.cfm?utm_source=internal&utm_medium=search&; utm_content=cf&utm_campaign=celsearchtest&formfield1234567891=169&formfi eld1234567892=5&formfield1234567894=&term=laser&btnHand.x=17&btnHand.y=7 And there is a flat shipping cost of $5.95 for orders up to $15.00 so the lowest cost could be $16.00 to you. So your total cost would be around $7.00 plus $16.00 = $23.00. Putting the unit together will be easy. Remove the connectors from the LED module and the power supply, expose several inches of the two wires in each cable and strip away some of the insulation at the end of each wire. Now connect (twist together) one wire from the power supply to one wire from the LED module. Any wires are ok. Now connect the two remaining wires. Insulate each connection with tape. Plug in the power supply. If the module lights up you are done. If it does not. Just reverse the wire connections, plug it in and the module should light up. Note: you can do this method with the LED module ONLY because putting a reverse voltage of 15 volts on the module will not harm it. DO NOT use this technique with other electronic equipment. - Steve N -- The Silver List is a moderated forum for discussing Colloidal Silver. Rules and Instructions: http://www.silverlist.org Unsubscribe: <mailto:[email protected]?subject=unsubscribe> Archives: http://www.mail-archive.com/[email protected]/maillist.html Off-Topic discussions: <mailto:[email protected]> List Owner: Mike Devour <mailto:[email protected]>
