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DIYstompboxes.com  |  DIY Stompboxes  |  Building your own stompbox  |  Sound 2 Light with LM386N-3? 0 Members and 1 Guest are viewing this topic. « previous next »
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Author Topic: Sound 2 Light with LM386N-3?  (Read 918 times)
bluesdevil
Posts: 949

Just a Bill in Florida


Sound 2 Light with LM386N-3?
« on: February 14, 2012, 08:25:45 PM »

I'm trying to get the "Sound 2 Light" circuit to work as a gate for my Anderton Ring Modulator build, but the LED stays on whether the input of the op amp is connected or not. I'm using a LM386n-3 instead of the LM386n-1 that's noted here:
http://www.aronnelson.com/gallery/main.php/v/chickpea/sound2light_.jpg.html
http://www.diystompboxes.com/smfforum/index.php?topic=82843.0
Could that be the problem? Also gets VERY hot.
Can't believe I'm muffing up such a simple circuit!
« Last Edit: February 14, 2012, 08:30:55 PM by bluesdevil » Logged

"I like the box caps because when I'm done populating the board it looks like a little city....and I'm the Mayor!" - armdnrdy
deadastronaut
Posts: 9538


Rob H. LONDON


WWW
Re: Sound 2 Light with LM386N-3?
« Reply #1 on: February 15, 2012, 02:55:08 AM »

hmmmm never used a -3  only a lm386n-1...

hold on ill bread it and see where it might be going moody...


ok, here goes, use input pin 3 (sorry wrong input on the diagram Roll Eyes) ,  and use 2 superbright 5mm blues in series, and a 470r-1k(adjust resistor value to taste/response) to ground, ...it wont go off/on with just 1 led...

its working fine on my breadboard.with lm386n-1.. Wink let us know how you get on...

i'll try it with a lm386n-3 and see if it gets hot... Wink

note the thread version is input 3....
« Last Edit: February 15, 2012, 03:13:51 AM by deadastronaut » Logged

bluesdevil
Posts: 949

Just a Bill in Florida


Re: Sound 2 Light with LM386N-3?
« Reply #2 on: February 15, 2012, 03:57:39 AM »

Thanks for replying, Rob. You are right, it doesn't work with just one LED..... 2 in series did the trick and no heating up of the 386n-3!!!
Now on to try it with a LDR to see if I can make some of gate with it. Really cool circuit, thanks for sharing it! icon_twisted
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"I like the box caps because when I'm done populating the board it looks like a little city....and I'm the Mayor!" - armdnrdy
deadastronaut
Posts: 9538


Rob H. LONDON


WWW
Re: Sound 2 Light with LM386N-3?
« Reply #3 on: February 15, 2012, 04:20:13 AM »

cool, glad you got it going man!... Wink
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Gurner
Posts: 1314


Re: Sound 2 Light with LM386N-3?
« Reply #4 on: February 15, 2012, 05:19:43 AM »

Thanks for replying, Rob. You are right, it doesn't work with just one LED..... 2 in series did the trick and no heating up of the 386n-3!!!
Now on to try it with a LDR to see if I can make some of gate with it. Really cool circuit, thanks for sharing it! icon_twisted

Just be warned - gate circuits normally need a degree of precision - & the led brightness as driven by the Lm386 will fade along with battery voltage, unless you regulate the supply to the Lm386, you'll end up with a different 'gate' point as the battery afeds.
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bluesdevil
Posts: 949

Just a Bill in Florida


Re: Sound 2 Light with LM386N-3?
« Reply #5 on: February 15, 2012, 02:29:16 PM »

No battery used, just an adapter for power, so hopefully that will help get it tuned in.... haven't had time to hook it all up yet, but soon!
***UPDATE***
Okay, it worked, but the decay ended up being a bit quicker than I wanted so I may just go with a separate noise gate pedal after it to squelch the carrier feedback.
I found a post with Mark Hammer suggesting to use the envelope follower in Dr. Q to do what I wanted to do with the LED/LDR combo, but I'm not quite sophisticated enough to figure it out.
« Last Edit: February 15, 2012, 08:34:19 PM by bluesdevil » Logged

"I like the box caps because when I'm done populating the board it looks like a little city....and I'm the Mayor!" - armdnrdy
artifus
Posts: 1742


dare to be na´ve


Re: Sound 2 Light with LM386N-3?
« Reply #6 on: February 16, 2012, 01:18:08 PM »

have you tried a large parallel capacitor across the leds? series cap may soften the attack too.
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bluesdevil
Posts: 949

Just a Bill in Florida


Re: Sound 2 Light with LM386N-3?
« Reply #7 on: February 16, 2012, 09:04:21 PM »

have you tried a large parallel capacitor across the leds? series cap may soften the attack too.

Thanks Artifus for your reply. I tried a cap across LED's, but they would not light with it.
Before boxing up I might try the Mark Hammer fix by using Dr. Q envelope follower circuit fragment.... if I can figure it out.
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"I like the box caps because when I'm done populating the board it looks like a little city....and I'm the Mayor!" - armdnrdy
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