Volume Pedal LED Indicator and Tap circuit

[ethniccheese]

I've been wanting to build two things lately that I can't find any information about.  

First, I want to find a circuit that indicates via an LED bar graph or, preferably, an LED 8-segment readout.  I assume you would have to have a simple A to D converter to get a digital equivalent of the analog 0-9V scale.  From there it shoule be pretty simple to drive the LED segment.  Does anyone know of a circuit that does this?  Is there an IC that has all of the functions needed to do this?

Second, I want to build an indicator in my tap pedal that flashes an LED at the rate of my taps.  I have no ideas on how to do this and was hoping some of you could give me some ideas.

[acromarty]

National Semiconductor have some led bargraph driver chips.
The LM3914 has a linear relationship between input signal and display, while the LM3915 is logarithmic with 3dB per step and might be more useful for a volume pedal. They are designed for 10 element bargraph leds, and take an analogue input signal. Data sheets are available on their website at http://www.national.com/pf/LM/LM3915.html.
Cheers

[ethniccheese]

Yes!  That's exactly what I needed for the volume pedal.  I was unaware that the LED drivers would use an analoge input.  I assumed it would be digital.

Thanks