Posts tagged LED-driver

I was analyzing the design a hazard warning light.The spec of the light turn on off is given below. The flashing-light frequency shall be 90+/-30 times per minute. May I know in this case the...

1 answer  ·  posted 1d ago by newbie‭  ·  last activity 1d ago by Olin Lathrop‭

I’d like to create a stable IR LED light source. I’ve read that LED efficiency changes with temperature. I’ve seen two designs which used feedback through light to correct the LED temperature dri...

1 answer  ·  posted 1mo ago by misk94555‭  ·  edited 25d ago by misk94555‭

I'm trying to understand a circuit for driving a LED found on a board I purchased. Below is the circuit driven by an I/O pin (HS2) of a small 3.3V processor. The HS2 pin is driven by the I/O wi...

4 answers  ·  posted 4y ago by eric‭  ·  last activity 7mo ago by TonyStewart‭

It is common to have a series resistor to limit the current trough an LED. I saw a circuit using the LED driver: stp16cpc26. but instead having the series resistor, they are in parallel. This LED...

1 answer  ·  posted 3y ago by zeke‭  ·  edited 9mo ago by Lorenzo Donati‭

I'm trying to modify a LED torch, and there is a DC-DC booster (1.5 V to 3.3 V) and after that some SOT-23 device which (I assume) keeps constant 90 mA current through LED. I know I could remove th...

2 answers  ·  posted 3y ago by Chupacabras‭  ·  edited 9mo ago by Lorenzo Donati‭

posted 3y ago by Circuit fantasist‭  ·  edited 9mo ago by Lorenzo Donati‭

Suppose we have this circuit How do I pick a appropriate value for the resistor R1?

3 answers  ·  posted 2y ago by MissMulan‭  ·  edited 9mo ago by Lorenzo Donati‭