Author Topic: lm386 questions...(SOLVeD!) (Read 3549 times)

akomismo01 · « **on:** July 03, 2009, 10:49:54 PM »

1) if you put more than 2 leds in the amp, will the resistors ohms value change or not?..

EliteGamer83 · « **Reply #1 on:** July 04, 2009, 06:56:38 AM »

Yes it will.

It feels like I've said this 100 times...

Learn Ohm's law (google it) then you can do your own math.

Or use a LED calculator, I couldn't find the output from the lm386 so you will have to ether find someone who has done this or test it yourself, hook up the lm386 and measure the max output with a multi-meter.

Jumbo · « **Reply #2 on:** July 04, 2009, 08:50:58 AM »

its about 5 volts. It changes alot. I have done MANY test on this and the highest i could get was 5.5 volts which is the voltage of the 5 volt point in the PSP fat.

akomismo01 · « **Reply #3 on:** July 05, 2009, 04:51:30 AM »

thanks dude?.. im gonna clear things up so i will not mess up... putting more leds in the amp will changes the 191k ohms & 30k ohms values to xxxk ohms & xxxk ohms? is this right?..

atomicareprise · « **Reply #4 on:** July 05, 2009, 05:27:03 AM »

this will make things much clearer and easier for you buddy..

the lm386 runs with the 5v then the 191k and 30k runs through the + and - of the

speakers...the resistors value that you'll gonna use will depends on the colors and the

quantity of leds you'll be using to your mods...the 191k and 30k are fix values...

i hope this will help you..

akomismo01 · « **Reply #5 on:** July 05, 2009, 05:28:26 AM »

so if i use blue leds do i need resistors or not?...

atomicareprise · « **Reply #6 on:** July 05, 2009, 05:32:25 AM »

how many leds are you planning to use?

using resistors will help your leds to last long buddy...

so i recommend you to use one..

akomismo01 · « **Reply #7 on:** July 05, 2009, 05:33:55 AM »

im using 14......

atomicareprise · « **Reply #8 on:** July 05, 2009, 05:39:22 AM »

use the led calc...i think you'll be needing 100 ohms 1/8 watts if i'm not mistaken...

just check it for clarifications..

akomismo01 · « **Reply #9 on:** July 05, 2009, 05:41:17 AM »

what will happen if i dont put resistors?..

atomicareprise · « **Reply #10 on:** July 05, 2009, 05:54:27 AM »

they won't last long...

Blazinkaos · « **Reply #11 on:** July 05, 2009, 07:02:34 AM »

Start to fade and look ugly.

atomicareprise · « **Reply #12 on:** July 05, 2009, 08:24:41 AM »

u don't want that do u

Jumbo · « **Reply #13 on:** July 05, 2009, 01:54:20 PM »

They might even burn out instantly. Like i said the power off the LM386 IS 5volts. 5 volts meeting a 3.4 max forward voltage LED isnt good.......

akomismo01 · « **Reply #14 on:** July 05, 2009, 06:38:26 PM »

ahh!..i finaly got this..but what is the output of the amp so i can start calculating the proper resistors.. and what wats do u need for the 191k ohms and 30k ohms?

Blazinkaos · « **Reply #15 on:** July 05, 2009, 08:04:35 PM »

Those are the resistors you need to do this mod.

akomismo01 · « **Reply #16 on:** July 05, 2009, 09:52:45 PM »

.i mean wat watage?

bustinthejustin · « **Reply #17 on:** July 05, 2009, 10:11:53 PM »

1/8 will work fine.

akomismo01 · « **Reply #18 on:** July 06, 2009, 12:58:55 AM »

so i will buy a 191k and 30k wìth 1/8 wattage?

atomicareprise · « **Reply #19 on:** July 06, 2009, 03:03:48 AM »

yes as what bustin told you...

and like i said before you will find it hard to acquire 191k resistors in our place so

the next best thing for you to do is series it...30k can be easily found....

akomismo01 · « **Reply #20 on:** July 06, 2009, 04:27:42 AM »

thanks dudes.. i will just try to find 191k ohms.. if not i will try to hook it up in series.. thankks guys..

Blazinkaos · « **Reply #21 on:** July 06, 2009, 01:18:07 PM »

Ok if you cant find the 191k get a 180k and 11k thats what i did and works just the same way and combine them.

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Author Topic: lm386 questions...(SOLVeD!) (Read 3549 times)