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Questions tagged [transistor]

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

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Water tank false trigger

I am trying to make a simple water overflow protection system for my home. I have created it using BC547 and NodeMCU (ESP8266). I have a simple circuit like this: The problem here is I have 2 wires ...
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How to make a circuit to control a 24V solenoid

I'm new to programming with Arduino and a little rusty with circuitry. I'm trying to control a 24V solenoid with the Arduino mega board. I've done some research into this and I believe I have a code ...
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Do I need one N3904 for each LED?

I want to control 4 (or more) LEDs using the PWM output pins of my Arduino. Here is how I have it on a breadboard, and it's working for me. Question: Is this schematic inefficient? Are there any ...
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Motor on transistor causes arduino to reset

I have a motor hooked up to the emitter of a NTE24 transistor and ground, the collector is hooked up to 3.7V, and the base is connected through a 10ohm resistor to a PWM pin on an arduino mega, which ...
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Arduino LED PWM dimmer starts blinking on low PWM values

I'm trying to build a PWM led dimmer with Arduino using this circuit: simulate this circuit – Schematic created using CircuitLab Everything works fine until the pin PWM 3 drops below the ...