piclist 2002\12\14\073543a >
Thread: Backlight powering from wall outlet?
picon face BY : Jason Harper email (remove spam text)

Aaron wrote:
> I'm planning on a bridge rect with filter cap to get 120V DC, then
> (using a pic of course), PWM @ 400 Hz an NPN (MPSA42) controlling the
> 120V.

This isn't going to work.  An EL panel is effectively a capacitor: pulsed
DC will give you a brief flash of light as the capacitor charges, but after
that you'll get nothing.  You could try putting a resistor across the panel
to discharge it between pulses, but it would be better to use an H-bridge
to get the required reversal of current flow, or a half-bridge switching
one side of the panel between +HV and -HV (with the other side groudned).
       Jason Harper

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Subject (change) Backlight powering from wall outlet?

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