Driver circuit for small EL backlight

T

Tom Twist

Guest
Hi

I have some 16x2 LCD panels, with EL backlight.
I think they need something like 100 V, 400 Hz, at 1 - 2 mA

Has anyone got a circuit solution?
I don't want to buy special ICs.

Tom
 
"Tom Twist" <tom@twist.no> wrote in message
news:301lf1pmdjucmr5vlvjvom5cnm4ovnpuvd@4ax.com...
Hi

I have some 16x2 LCD panels, with EL backlight.
I think they need something like 100 V, 400 Hz, at 1 - 2 mA

Has anyone got a circuit solution?
I don't want to buy special ICs.

Tom
Click to expand...
Don't need 400 Hz. You can use a light dimmer from a hardware store, for
the EL panel at 60hz, add a resistor in series to keep things safe(limits
current not voltage so much).
 
On Wed, 10 Aug 2005 21:57:55 -0500, "night soil dalits"
<invalids@invalid.com> wrote:

"Tom Twist" <tom@twist.no> wrote in message
news:301lf1pmdjucmr5vlvjvom5cnm4ovnpuvd@4ax.com...
Hi

I have some 16x2 LCD panels, with EL backlight.
I think they need something like 100 V, 400 Hz, at 1 - 2 mA

Has anyone got a circuit solution?
I don't want to buy special ICs.

Tom

Don't need 400 Hz. You can use a light dimmer from a hardware store, for
the EL panel at 60hz, add a resistor in series to keep things safe(limits
current not voltage so much).
Click to expand...
Not very useful in a battery operated device :(
 
On Thu, 11 Aug 2005 21:20:38 +0200, Tom Twist <tom@twist.no> wrote:

On Wed, 10 Aug 2005 21:57:55 -0500, "night soil dalits"
invalids@invalid.com> wrote:


"Tom Twist" <tom@twist.no> wrote in message
news:301lf1pmdjucmr5vlvjvom5cnm4ovnpuvd@4ax.com...
Hi

I have some 16x2 LCD panels, with EL backlight.
I think they need something like 100 V, 400 Hz, at 1 - 2 mA

Has anyone got a circuit solution?
I don't want to buy special ICs.

Tom

Don't need 400 Hz. You can use a light dimmer from a hardware store, for
the EL panel at 60hz, add a resistor in series to keep things safe(limits
current not voltage so much).

Not very useful in a battery operated device :(
Click to expand...
You need an inverter, which you can buy or do by yourself (at that
power level there is no problem). Basically, an oscillator plus a
transformer. Maybe you knew this. I don't know.
 
"Mochuelo" <cucafera@RE_MO_VE_THIStelefonica.net> wrote in message
news:eek:senf1h3v1dae3fap0jk9bvt09vinu6ikp@4ax.com...
On Thu, 11 Aug 2005 21:20:38 +0200, Tom Twist <tom@twist.no> wrote:

On Wed, 10 Aug 2005 21:57:55 -0500, "night soil dalits"
invalids@invalid.com> wrote:


"Tom Twist" <tom@twist.no> wrote in message
news:301lf1pmdjucmr5vlvjvom5cnm4ovnpuvd@4ax.com...
Hi

I have some 16x2 LCD panels, with EL backlight.
I think they need something like 100 V, 400 Hz, at 1 - 2 mA

Has anyone got a circuit solution?
I don't want to buy special ICs.

Tom

Don't need 400 Hz. You can use a light dimmer from a hardware store,
for
the EL panel at 60hz, add a resistor in series to keep things
safe(limits
current not voltage so much).

Not very useful in a battery operated device :(

You need an inverter, which you can buy or do by yourself (at that
power level there is no problem). Basically, an oscillator plus a
transformer. Maybe you knew this. I don't know.
Click to expand...
You can take apart an old camara flash unit and use the HV voltage from it.
may need a resistor in series there too, dont need to trigger it.
They are battery powered.

>
 
On Thu, 11 Aug 2005 00:51:19 +0200, in sci.electronics.design Tom
Twist <tom@twist.no> wrote:

Hi

I have some 16x2 LCD panels, with EL backlight.
I think they need something like 100 V, 400 Hz, at 1 - 2 mA

Has anyone got a circuit solution?
I don't want to buy special ICs.

Tom
http://www.zetex.com/3.0/3-8-1a.asp
Click to expand...

a few apps here


martin
 
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