Led Dimmer

222

03:52:13

-[TO DIMME THE LEDS PLAY WITH THE VARIABLE RESISTOR ] 
-This is a basic Led dimmer using a single  transistor and a variable resistor , the resistor located next to the bottom Led is for limiting  the current that comes from the two branches  because the currents are added the resulting current exedce the operating currunt of the Led .  A.gsb

published 11 years ago

rbrtkurtz

11 years ago

That's kind of the gist of it, but you might want to limit the current to the LEDs so that they don't blow up if the potentiometer is turned too far. When the light from a bulb or LED looks like an X, that means they've failed.

faceblast

11 years ago

also 2W through the PNP is nasty, that's going to need heatsinking. you have 20V source, just run them in series and limit the max current to 20mA.

add comment in editor

EveryCircuit is an easy to use, highly interactive circuit simulator and schematic capture tool. Real-time circuit simulation, interactivity, and dynamic visualization make it a must have application for professionals and academia. EveryCircuit user community has collaboratively created the largest searchable library of circuit designs. EveryCircuit app runs online in popular browsers and on mobile phones and tablets, enabling you to capture design ideas and learn electronics on the go.