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Console Modding------ ( Here you can talk about your favorite Consoles ) => PSP's => PSP Slim (2000) => Topic started by: bustinthejustin on December 07, 2008, 08:39:56 AM

Title: lm386 voltage output
Post by: bustinthejustin 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!
Title: Re: lm386 voltage output
Post by: 123sample 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
Title: Re: lm386 voltage output
Post by: bustinthejustin 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.
Title: Re: lm386 voltage output
Post by: 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)
Title: Re: lm386 voltage output
Post by: bustinthejustin 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...
Title: Re: lm386 voltage output
Post by: Jumbo 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.
Title: Re: lm386 voltage output
Post by: j.s2ghetto 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 (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
Title: Re: lm386 voltage output
Post by: bustinthejustin 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.