[sdiy] bunch O' LEDS

[phil macnutt]

Ok guys, I need a little help.

 

Sounds weird, but I need to drive a bunch of leds with a pitch CV.

For example I'd like the LEDS to see 0-1 amp (50 leds)  corresponding  to a
0-2volt input.  The LEDS are all in parallel, and do not have resistors on
each one.

I poked around and found a really simple circuit that is nothing but an
opamp and a single resistor that does this V-C conversion.

Works great, but the amp could never drive a whole stack of leds.  So, I
guess I need a circuit that I can use a power transistor with at the output
and some sort of pot to adjust the sensitivity (based on the CV range).

If anybody knows of info already on the web regarding this, just point me in
the right direction

 

On another topic, I'm currently experimenting with various paints for
silkscreening front panels, and I should have some information on which
paint is best if anybody is interested.  I got my screens from Westar, and
they look great.

 

Thanks in advance for any assistance!

phil

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