Converting VU meter design to single power supply

All the leds are in series, and yoy will drop over a volt on each one, so that is the minimum rail that you can get away with, plus a bit more for safety. Look at the LM3914/3915/3916 from national, far more friendly, and will work from 12V and will be more stable

martin

You need a different circuit to use a single 12 volt supply and light up 10 LEDs.

Ed

ec.com/avu.html. This design specifies a =A0+18v-0v-18v

Yoicks, try something that's from this decade. That design is ridiculous overkill and needlessly complex.

Surf on "bargraph"... IIRC National makes a chip ideally suited for this purpose.

...Jim Thompson

That was the main reason I wanted to build it. I know the purpose specific ICs will do a better job, be cheaper, less complex etc, but I really wanted to have a go at building something more than just an IC and a bunch of LEDs. I'm building it more for the fun of it than any actual practical use. I've found a more suitable design at

that's from this decade. That design is

I actually understand that, being a tube geek at times.

And the first thing you wanted to do was find out which parts you could change or throw away!?????

at

The LM3914 has been in production for *decades* and is still available.

power

check my site (down) under electronics for another schematic (LED logaritmic Peak audio meter 4 PC) ...

-- Regards , SPAJKY ® mail addr. @ my site @