Re: [avr-chat] high speed LED switching circuit

[gecko gecko]

The issue is could be the transistor and driver circuit, the transistor could be just to slow! Get yourself a mosfet and give the gate pleanty of drive to ensure turning on speeds are kept, and be sure to pull the gate low whilst its not being driven to counteract the capacitance in the mosfet.

 

----- Original Message -----
From: "Reza Naima"
To: address@hidden
Subject: [avr-chat] high speed LED switching circuit
Date: Wed, 29 Jun 2005 16:24:00 -0700

>
>
> I'm looking at building a circuit to drive an IR LED at a pretty fast
> speed to transmit data (~5Mhz). I tried a simple circuit that used a
> transistor to switch the LED on and off, but it seemed fairly slow. I'm
> looking at having about 60mW of power (~20mA @ 3v) to drive it. Any
> suggestions on a high speed switching circuit?
>
> thanks,
> reza
>
>
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> AVR-chat mailing list
> address@hidden
> http://lists.nongnu.org/mailman/listinfo/avr-chat

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