Simple LED driver, transistor and GPIO
Jul 11, 2019 · I'm trying to figure out how to create a driver for a led from the GPIO pins of the raspberry and a NPN 2N3904 transistor. I am currently following what seems to be a good sparkfun tutorial. On …
constant current - Explanation of LED driver circuit - Electrical ...
Aug 9, 2015 · I've been reading up on LED drivers and found some common connection schemes. Yet, I recently came across the following LED driver circuit at this URL: I tried to find out what exactely was …
Transistor with PWM vs LED driver for LCD backlight
Aug 14, 2021 · 0 I'd like to design a circuit that utilizes a small 1.3" LCD display with maximum LED backlight forward current of 40 mA. Since I'd like to use brightness control, I am hesitating between …
Using a transistor to control a LED - Electrical Engineering Stack …
Dec 30, 2020 · I think I get it right so far (I hope.) Now I am trying to turn on/off the LED using a 2N2222A NPN transistor: simulate this circuit I looked it up online and find most people referring to …
led driver - Circuit breaker selection and panel design for LED ...
Nov 7, 2024 · 0 This drawing was made for LED lighting fixtures. The fixtures will operate at 230V and have a power factor of >0.95. The current in each branch should be around 2-3 amperes. I don't …
IR LED with transistor - Electrical Engineering Stack Exchange
Jun 22, 2023 · I’m trying to design a IR remote controller. I tried to design IR LED driver. I designed this circuit for IR driver. I used ESP8266 for first test for IR LED. I used though-hole version of MMBT222...
current - How can I efficiently drive an LED? - Electrical Engineering ...
Jan 6, 2024 · An LED requires a minimum voltage before it will turn on at all. This voltage varies with the type of LED, but is typically in the neighborhood of 1.5V - 4.4V. Once this voltage is reached, current …
Driving LED with an N-channel MOSFET
Jun 14, 2019 · 5 I am driving a red LED with a forward voltage of approx. 2 V as shown in the picture. The driving signal comes from a microcontroller with a logic HIGH of 1.8 V. The LED is being …
Designing a fast LED driver from scratch
Dec 6, 2016 · Which transistor pair would be good to drive a 3 W LED in push-pull? How do I calculate the resistors specifically for the LED (3.5 V, 700 mA)? What type of power supply can I use to drive …
BJT Driving an LED - Electrical Engineering Stack Exchange
Jan 28, 2015 · Adding to what Brian Drummond says above, since LEDs are current driven devices, the right hand circuit is often the appropriate choice (although I'd move the LED to the collector) because …