Cat Laser Eye Fuzz

[adam193]

This is probably one of my favorite effects, not the fuzz (its not my cup of tea) but the LED's are pure genius.

Anyone know of a circuit that will do this that I can add into another pedal? When its engaged to light up a series of LEDs according to the input signal - the harder i push it, the more they light up...

[EBK]

It's not quite clear to me from that video how the LED's are responding.  I thought they were simply reacting as if hooked to a lm3916 LED bar graph driver, then that trippy stuff at the end of the clip happened....

Any way you can put into more words what you want to achieve?

[adam193]

So the cat eyes go on when the pedal is engaged, seems simple enough to have two LED's come on when engaged. Just wire them up in series.

So the extra ones... I'd like to come on, maybe with the led's lighting up with signal, more signal equals more lights, so say there are 5 extra LED, each one coming on with an additional 20% of the max signal, all the way up to all the lights lit. does that make sense?

[EBK]

So the cat eyes go on when the pedal is engaged, seems simple enough to have two LED's come on when engaged. Just wire them up in series.

So the extra ones... I'd like to come on, maybe with the led's lighting up with signal, more signal equals more lights, so say there are 5 extra LED, each one coming on with an additional 20% of the max signal, all the way up to all the lights lit. does that make sense?

Yes.  Look at the spec sheet for the lm3916.
http://cdn.sparkfun.com/datasheets/Components/General%20IC/lm3916.pdf

[pinkjimiphoton]

holy cow, thanks guys... i was actually wondering about something like this myself just today.
i've tried putting leds in series, but they just seem to flash.. this could be really cool for a compressor or something, you could watch the signal squish and then rise or whatever.

nice trick, whatever it is

and hey... can ANY fuzz be TRULY bad? 

[EBK]

this could be really cool for a compressor or something, you could watch the signal squish and then rise or whatever.

Did you miss my threadjacking where I crudely demonstrated my bar graph compression indicator, Jimi?
http://www.diystompboxes.com/smfforum/index.php?topic=116801.msg1084309#msg1084309 (doesn't use the lm3916 chip though -- it's a microcontroller solution instead)

I should add that there are 3 bar graph drivers in the LED bar graph driver series:
lm3914 linear scale
lm3915 log scale
lm3916 log(VU) scale

To show something correlating to audio level, you'll want either the lm3915 or lm3916.

[stringsthings]

That is so cool!