At 08:23 PM 3/7/02 +0000, Benjamin Bromilow wrote:
(EE tag added)

>  Try this.......
>555 in astable mode. Use a port pin to drive the 555 enable pin. Connect
>all the cathodes from the LEDs to the astable output. Enable off, output
>low, LED on full. Enable on, output astable, LED brightness controlled by
>astable duty cycle.
>The 555 can source this direct aswell.

This is clever. I suppose you mean to attach the PIC to the "control
voltage" pin (pin 5). Most likely you'd want to have the 555 sinking
current because of the way the duty cycle would be and because the
CMOS 555s can sink current better than source it.

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
speff@interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com
9/11 United we Stand

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