VFD bargraph

Parts Questions
1

Hello, does anyone know where to find a 2x10 vfd bargraph (1x10 ok too)?

Thanks in advance

2

… why don’t make one out of a single line character vfd?

http://www.parallax.com/images/robotics/machining/rpm_display/avi/RPMDisplay.AVI

http://cgi.ebay.com/D013-NEW-Noritake-Itron-VFD-Fluorescent-Display-Module_W0QQitemZ7544220822QQcategoryZ26206QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

Greets, Roger

3

Hi,

I thought about it, but since I designed the circuit with an LM3915 to monitor on logarithmic scale audio signals amplitude, I don’t know how to implement it to a normal VFD. Have you got some clues on how to do it (LM3915 can drive up to 10 leds, more than 10 would be really appreciated :wink: Maybe using another IC?

4

Have you got some clues on how to do it (LM3915 can drive up to 10 leds, more than 10 would be really appreciated  Maybe using another IC?

I have no experience with VDFs but you can cascade two LM3915 for up to 20 LEDs. Look at the datasheet:

http://www.national.com/ds.cgi/LM/LM3915.pdf

Raphael

5

Thanks raphael, the question is: the datasheet shows how to interface the lm3915 to VFD bargraph.

normal VFD’s (I’m used only to noritake U-series so same interface as HD44780) offer same pinning of standard hd44780 lcd’s. there are not as many pin as character number on display, that’s because I don’t know how to interface the LM3915 to a VFD

6

I forgot: the best deal would be to use one vfd 2x16 to monitor a stereo signal