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Topic: dimming leds with tip122 and voltage variable (Read 1 time) previous topic - next topic


Im trying to dimming two LEDs in parallel with a power supply of 3-48V variable and 1.4A constants with a TIP122. If I use a 3.7V battery I have no problems, but the supply give me 48V and tip begins heating extremely, but leds only needs 3V. This is like transistor demands all power capacity. Im using a 2k2 resistor on the base.
any idea? thanks



[Draw it out on a sheet of paper, take a picture of that and include it as an attachment.]
"Who is like unto the beast? who is able to make war with him?"
When all else fails, check your wiring!

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