Stack Exchange Network

Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [transistor]

A semiconductor component used for amplifying or switching electrical signals. Use this tag for discussing transistor circuits.

4
votes
1answer
5k views

How to switch an external circuit with Arduino?

I have an object with a series of led and I want to turn on and off these leds from my Arduino. The input of the LED circuit is 24v DC 100mA. What I've done is the following: I've cut a wire of this ...
3
votes
4answers
6k views

Transistor amplifier to drive speaker using Arduino PWM [closed]

I have been working on a project lately which uses Arduino to play a wav file from SD card. I am using TMRPCM library which made the job very easy. But the problem is that the output sound in the ...
1
vote
2answers
216 views

How come my transistor doesn't work?

I have a TIP 120 to 229 NON 60V 5A transistor I'm trying to use it to switch an electro magnet. Using the blink example to test it out: // the setup function runs once when you press reset or power ...
1
vote
2answers
7k views

Controlling an LED using a transistor (TL188)

I wanted to control an LED using a transistor (my first attempt at using a transistor). I connected a transistor (TL188) to pin 13 of an Arduino Uno accidentally and noticed something. (The resistor ...
0
votes
2answers
385 views

Controlling multiple fans using arduino uno

I'm kind of new on the field of Arduino. Although I have a question concerning multiple fan connection on 1 arduino PWM pin. The goal is to connect around 8 to 16 fans on 1 arduino pwm header pin and ...
0
votes
1answer
130 views

Making an H-bridge with transistors [closed]

I am trying to make an H-bridge with two NPN and two PNP transistors to drive a motor which works fine on the 5 V Arduino. I have a schematic in the picture. When I use a simple code to have pin 9 ...
0
votes
2answers
2k views

How can I make an H-bridge using NPN transistor? [closed]

I am new to arduino and I wanted to make an h-bridge because it is not easily available in india. I want to control the h-bridge using arduino uno r3 board and 2n2222A transistors and 1n4001 Diodes if ...