@robotz since some of this thread was off topic ,posting the info on the johhny five circuit again

USA
Posted at 4/24/2012 12:00:52 PM #3

ok found the chip i have AN6884 YOU NEED 2 OF THEM,sound input goes to both chips ,very few parts needed mostly a pot for gain on input like 5 k and one cap for a filter on power supply

an6884 pdf

chip cost $1.60 from futurlec.com ,about $.30 for a 5k pcb mounted pot,10 k will work too

fxrtst that circuit only flashes all leds to sound

the way bar graph or vu meter circuit works it has op amp used as a comparator for each led and a voltage string,when audio level is apply to the first string input turns on the led set by the threshold of the votage string and the level of aduio as it increases then next led is control by threshold of the next divider value and so on if you need them flashing it needs another simple circuit added to the chip also can be hook up in parallel too

on circuit that FXRST it will work for bret ,if he only needs one led or a string of leds to flash with audio just a simple transistor switch by sound,how it works audio it at the base of the transistor,(also should have a base resistor of 1 k to protect it) ,but as voltage is apply to the base it turns it off or on to sound ,one op amp is better but still will work also any npn transistor will work,that one is 40 watts too high not really needed 2N2222 will work up to 100 ma and more an6884 pdf

I will give both of these ideas a try. Looks simple enough. Thanks for the info. and advice.

rgordon anytime you need any electronc design just ask ,it is free made so many for my work,but cant use the complete design because of legal problems one design i made was so advance got a bonus of $70,000

@robotmaker,

That is an awesome offer thanks so much!

v/r

Kevin

anytime kevin i lack in programming ,except in LEAF AI software LISPWORKS getting fairly good at it

Hey thanks, I think I see about your design for the LEDs . That is a way cooler way to light up LEDs to sound. Id love to see an array of LEDs working like that. Very neat!

Will

might use them also in another robot design the rad 4.0.but my main use is JOHNNY FIVE ROBOT,TO LOOK LIKE IN THE MOVIES,you face them in so when you use sound it opens slowly and as you increase it ,more leds open like a mouth,works just like in the movie

Very cool. I have to watch that movie been a very long time since Ive seen that film.