On Fri, 20 Apr 2001, Bill Layer wrote: > That 'circuit' will be a patch cord from the audio jack, running through a > resistive divider or L-pad (passive control, like a pot) right to the > meter's input. This is the beauty of it, we don't need to engineer any > digital hardware... all in the analog domain. Childs play. Far be it from me to mess with your fun, but you're making this way too hard. You don't need the sound card. Any signal where it's integral can be proportional by some factor to the amount of RAM will do. You only need a couple of caps, a couple of resistors, and probably a $.25 buffer amp. Take a signal from the PC speaker line, or a serial line. Or use the sound card. Really, I think you can do this for about a dollars worth of parts, besides the meters. Have fun, Phil M -- "To misattribute a quote is unforgivable." --Anonymous