Hi, I googled but couldn't find this particular situation answered.
I want to drive 8 IR LEDs at 38KHz with a microcontroller. I can drive one no problem. The circuit I have sinks current into the microcontroller that is running 38Khz PWM after current passes the LED and a 100 ohm resistor.
But I want to drive 8 of these things and I'm worried about the current load. I know I can use a simple transistor circuit to drive them, but before I order (or go to radio shack) to get a transistor, I want to make sure I get one that can handle the 38KHz. I thought of running them in series, but the total voltage drops (0.7*8) exceed 5 volts.
If possible I would like to just use one transistor rather than 8. Any suggestions where to look?
Thanks in advance.
Jeff
I want to drive 8 IR LEDs at 38KHz with a microcontroller. I can drive one no problem. The circuit I have sinks current into the microcontroller that is running 38Khz PWM after current passes the LED and a 100 ohm resistor.
But I want to drive 8 of these things and I'm worried about the current load. I know I can use a simple transistor circuit to drive them, but before I order (or go to radio shack) to get a transistor, I want to make sure I get one that can handle the 38KHz. I thought of running them in series, but the total voltage drops (0.7*8) exceed 5 volts.
If possible I would like to just use one transistor rather than 8. Any suggestions where to look?
Thanks in advance.
Jeff