An earlier post on what currents leds need to light got me wondering, and after messing with some high-value resistors I built this tester, no PICs or expensive chips. Parts list: 1. Used 9v battery, ex smoke detector. Instructions: 1. Lick finger & thumb, grip led anode. 2. Hold cathode wire (flat side of led) to battery negative. 3. Lick finger on other hand, touch battery positive.
*finds a yellow led... turns on the powersuply... turns the voltage wheel slowlt to 30volts in frankelstein style...follows cpemma's notes...* nice! i can feel it in my finger now.. *gets idea of ghetto touch sensor...* "lick on your hand on put it on this plate"' edit: i just hit the 500 post mark! ( )
A 3v lithium battery works good also. Cheap, especially if you kill a lot of motherboards. Just put the battery between the leads of the leds.
