+BigWhiteTruck Posted February 10, 2006 Share Posted February 10, 2006 I created a circuit for this. I wanted my LED dim enough to only be seen if you shut off all your flashlights (yes I am twisted) I used a LED from radioshack that is pre-wired to blink. It still needed the inline resistor. I threw a 220-ohm resistor inline with a 3V lithium battery (123A) and it blinked quite brightly. I experimented with increasing the resistance. I found it is still detectable in the dark even with 60k ohms inline resistance! I now have about 50k inline with a 0-10k mini potentiameter for fine tuning when i get it into the field. I put the whole package into a film can with just the led and the pot screw sticking above the rim. Then I filled the can with melted wax and let it cool. Totally waterproof and by my calculations, it should easily rn for over 5 years, depending on the amount i trim the pot screw. If I was going to do it again, I would put 10k inline with a 50k pot for a wider adjustment. As it is I am worried it will be too dim with no way to brighten it. I may make another one this way, am out maybe $5 so far. Quote Link to comment
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.