A wearable sound-to-light display, without a microprocessor - the Musicator Junior.

Step 2 The Schematic

Thanks to echoskope for this schematic!

You can download a larger copy of the circuit here.

You can download a copy in pdf format here.

Comments

[AronC0816]

I have to agree with the two people above me. I can somewhat read schematics but this one confuses me. It would have made more sense if the rectangular shape of the op-amp was included and the interior circuits were shown inside that box. Then you could show each of the eight pins and what they should connect to. I tried to wire this up but it took me over an hour and it doesn't work. So apparently i did something wrong.

[d-jslick]

hey, im having a tough time reading the schematics, and the "download a copy in pfd form" isn't working, does anyone think they could set up a link. i think i get most of it. but im a little confused and flustered

[qs]

I've added a link to a larger image to the step above.

Let us know how your project works out!

[amjeyy]

I cant seem to get this to work at all, im using polarised capacitors so not sure what the orientation should be like? im a relative newbie at this. The leds light up and stay in mid level brightness.

[amjeyy]

got it, the generic mic i used was connected wrong.. all the comments below really helped in tweaking its sensitivity and brightness. thanks for this great instructable.

[arodri35]

Its me again...so i managed to get how to hook up transistors, but in this schematic where did you get the 47k resistor?? Also you said we need 5 10k resistors and this only used 4...just wondering... close to completing this but I was just a bit confused on those two things..if you could help me when you have a chance that would be nice Thanks

[qs]

The 10k was replaced in the actual construction by the 47k - either can be used, it's not overly critical there. 

[arodri35]

Does it simply change the amount of current that goes through the positive lead on the op amp?

[qs]

No - just the opposite, the resistor makes sure the + input does not pick up any stray charge in the air and turn on the LED. 

[botronics]

I made a sound activated Joule thief that uses a single AA battery.  I showed it at Maker Faire last weekend.

[qs]

That's amazing!  Will have to try it!

I've taken the liberty of including your design below should anyone want to try it as well.

Again, great design.

[thartaros]

same as the other guy. i'd like to do this but i dont know what the hell im looking at right now. it confuses and angers me D:<

[The End of A Heartache]

Old Topic but i cant ready skemetic's...is there another way to show how and where to wire the compnent to the board? :(