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Note 44.291 MOUNT-L 291 of 517 CUPIDO::STRITAR "Andrej Stritar,IJS,(61)-371-321" 72 lines 20-JAN-1994 10:11 CUPIDO::STRITAR "Andrej Stritar,IJS,(61)-371-321" 72 lines 20-JAN-1994 10:11 -------------------------------------------------------------------------------- Subj: Regulator for Headlamps Date: 19-Jan-1994 Posted-date: 19-Jan-1994 Because of the large number of requests from various caving and climbing groups from previous postings, I have worked up a price list for my headlamp voltage regulator as a bare printed circuit board, kit, or assembled and tested based on price quotes I have received. I can not guarantee these prices but I will try to stick with them. For those who missed the previous postings see below. I need to get a reasonable number of people to at least say they will buy them, before I commit well over $1000 of my money to buying PCB's and parts. Here's the prices: Schematic and Documentation Free just Email willie@cs.indiana.edu Bare printed circuit board $10 Kit: PCB plus parts $20 Assembled and tested $30 If I get over 100 PCB requests I can cut the cost of the PCB's to $7 and cut even further over 250 to $5. I had guessed about the PCB price at $5 before, so people who responded to that price need to respond to the $10 price. Shipping can be done via US mail for $1 for the PCB and $2 for the kit or A&T in the US. It will take me about 1 month to get stuff ready for shipment so all I want from potential customers at present is how many units they will buy. I will be taking the financial risk on this one, and I will be lucky to break even on costs. Let me also explain that the kit will include all the parts for the PCB but not any external stuff like wiring, power switch, box, battery holder, etc. Since this regulator can be used with many types of batteries and bulbs, it is also up to the user to select the battery and bulb combination that suits his needs. I can help with this selection via Email, and the documentation covers most questions about it. The assembled and tested unit is just the kit put together, tested, and calibrated. The user will want to put the board inside the headlamp or other box. If the unit is going to be immersed in water the box will have to be water tight or the unit will have to be potted. ----------------------------------------------------------------------- For those who missed previous postings: I have a schematic and documentation for a high efficiency voltage regulator which provides constant brightness lighting over most of the battery capacity. This regulator can be used with various types of batteries and bulbs to deliver almost all the availible power from the battery to the bulb without variation of brightness. I have used this regulator for caving for over a year now, and mountaineering since last summer. For mountain trips I find it to be invaluable since it more than doubles what I consider the useable capacity of 5 AA'a alkaline batteries running a 0.8 watt bulb. I get 13 hours of light vs. about 4 hours for 3 AA's running the same bulb. This means I can carry far less weight in batteries for a long trip for the same number of hours of headlamp use. For caving, I use 6 volt 6.5 AH or 10 AH rechargeable lead-acid batteries with a 4.5 watt halogen bulb. I get 9 hours from the 6.5 AH pack and 16 hours from the 10 AH of constant brightness light. I am so spoiled by the brightness that anything less just doesn't let me enjoy the cave as well. I will send anyone who is interested the info. via Email, if you send me a request. The schematic is in postscript and the documentation in ASCII. If you don't have a postscript printer, I will send you info via US mail. I don't want to post the stuff to the group since the files are long, and I can answer question when you request the info. Willie Hunt
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