55 New Figure Of Using Transistor to Drive Led

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led sequencers flashers clocks faders 18 stage led sequencer the question sometimes es up of how to cascade 4017 decade counters for more than 10 sequencial stages the led sequencer below shows a possible solution using a few extra parts 1 200 transistor circuits talking electronics kit for transistor circuits $15 00 a kit of ponents to make many of the circuits presented in this ebook is available for $15 00 plus $7 00 post
 

how to build a simple led driver circuit an led typically needs about 15ma with the npn transistor in the circuit amplification is usually to the degree of about 100 to 150 therefore the current will be amplified by 100 which is 0 5ma 100= 50ma 50ma is now sufficient to drive and light the led so you see how the transistor allows a circuit to be an led driver using an npn transistor to drive multiple leds from a pic using an npn transistor to drive multiple leds from a pic microcontroller output since standard 3mm 5mm 8mm and 10mm leds only require around 15ma to pnp transistor to drive led so an led connected between the other end of the resistor cathode and 5 anode would current no need for a base resistor however this is not the best way to do it the transistor in this configuration is acting as an emitter follower there will be 0 6v plus or minus some mv between base and emitter resistor


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