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Author Topic: lm386 voltage output  (Read 1839 times)

Offline bustinthejustin

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lm386 voltage output
« on: December 07, 2008, 08:39:56 AM »
Hey how much voltage comes out of an lm386 when it's all wired up? What are the 2 resistors (191k ohm and 30k ohm) used for? To prevent too much voltage running through the lm386? Where's the voltage supply coming off of anyway, 5v point or the speakers? Sorry I'm such a noob, and if there's any additional info you think I could use, then it would be greatly appreciated. Thanks!
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Offline 123sample

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Re: lm386 voltage output
« Reply #1 on: December 08, 2008, 01:58:44 AM »
https://www.acidmods.com/forum/index.php?topic=25303.0


Supply comes from 5v,

Point of speakers provides lower than 5v,

Therefore resistors needed to prevent burning led, Don't go below / above 191k 30k



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Offline bustinthejustin

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Re: lm386 voltage output
« Reply #2 on: December 08, 2008, 12:43:28 PM »
Okay thanks. So how much voltage comes out of the led output? That was my main question.
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Offline Jumbo

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Re: lm386 voltage output
« Reply #3 on: December 08, 2008, 02:08:13 PM »
Ill check for you in a second :D

Edit-
I get 3.3V in neutral state and i get 3.4V with music on at full blast. (Highest voltage written its 2.7V on average)
« Last Edit: December 08, 2008, 02:29:05 PM by Jumbo »
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Offline bustinthejustin

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Re: lm386 voltage output
« Reply #4 on: December 08, 2008, 05:56:49 PM »
Quote from: Jumbo on December 08, 2008, 02:08:13 PM
Ill check for you in a second :D

Edit-
I get 3.3V in neutral state and i get 3.4V with music on at full blast. (Highest voltage written its 2.7V on average)

what do you mean voltage written? But thanks for those values. I would assume it's similar for the soundboard mike sells. I'm gonne need some resistors for red LEDs, won't I...
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Offline Jumbo

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Re: lm386 voltage output
« Reply #5 on: December 08, 2008, 07:01:35 PM »
Quote from: bustinthejustin on December 08, 2008, 05:56:49 PM
what do you mean voltage written? But thanks for those values. I would assume it's similar for the soundboard mike sells. I'm gonne need some resistors for red LEDs, won't I...
This is mikes board..

Ya by highest written the highest my multimeter with music was 3.4 volts. It was about 2.7-2.8 on average though.
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Offline j.s2ghetto

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Re: lm386 voltage output
« Reply #6 on: December 08, 2008, 07:06:17 PM »
Quote from: bustinthejustin on December 08, 2008, 05:56:49 PM
what do you mean voltage written? But thanks for those values. I would assume it's similar for the soundboard mike sells. I'm gonne need some resistors for red LEDs, won't I...

it depends on ur red leds
http://cgi.ebay.com/50-PCS-0603-SMT-SMD-450-mcd-RED-LED-Free-Ship_W0QQitemZ220278241159QQcmdZViewItemQQptZBI_Electronic_Components?hash=item220278241159&_trksid=p3911.c0.m14&_trkparms=72%3A1205|66%3A2|65%3A12|39%3A1|240%3A1318

i have these and have no need for extra resistors
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Offline bustinthejustin

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Re: lm386 voltage output
« Reply #7 on: December 08, 2008, 07:54:04 PM »
Thanks guys. Ghetto, thanks for the info. I need some more leds anyway and I was wondering which ebay seller I should get them from.
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