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Author Topic: Sound Reactive question (LM386 combinations)  (Read 4218 times)

Offline mic9

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Sound Reactive question (LM386 combinations)
« on: March 11, 2009, 06:52:44 PM »
im making L0rdNiC0s sound reactive leds...

but i have a problem, i have completed all the list of the part that i needed in making this mod.. but i have one problem i can buy 191k resistor all stores i go, they tell me OUT OF STOCK  :w00t:  :w00t:  :w00t:

can i replace 191k resistor with 200k resistor?
and why does ever time im going to buy a resistor they ask me, what kind of wattage..?
does 1/2 watts is OK? 
what do you preffer?
« Last Edit: March 11, 2009, 07:37:12 PM by mic9 »
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Offline DLoc

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Re: Sound Reactive question (LM386 combinations)
« Reply #1 on: March 11, 2009, 07:27:31 PM »
The wattage stuff is related to ohms law which you can find in the tutorials section. If you exceed a rating you could have a fire hazzard in building some electronics. For the psp I don't think you need to ever really exceed 1/4 watt. (so yeah 1/2 watt won't hurt you. It may restrict too much power though.)
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Offline rgarjr

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Re: Sound Reactive question (LM386 combinations)
« Reply #2 on: March 11, 2009, 10:09:59 PM »
Quote from: mic9 on March 11, 2009, 06:52:44 PM
im making L0rdNiC0s sound reactive leds...

but i have a problem, i have completed all the list of the part that i needed in making this mod.. but i have one problem i can buy 191k resistor all stores i go, they tell me OUT OF STOCK  :w00t:  :w00t:  :w00t:

can i replace 191k resistor with 200k resistor?
and why does ever time im going to buy a resistor they ask me, what kind of wattage..?
does 1/2 watts is OK? 
what do you preffer?

I would try to get it as close as possible to 191K Ohms.  Just search around for the resistors.  The more wattage the resistors the bigger it will be, U should be fine with 1/8 or 1/4. 
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Offline phoenix_s

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Re: Sound Reactive question (LM386 combinations)
« Reply #3 on: March 12, 2009, 12:17:22 AM »
use the speakers from motorola 398 they are perfekt^^
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Sry for my Bad english^^

Offline mic9

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Re: Sound Reactive question (LM386 combinations)
« Reply #4 on: March 12, 2009, 04:15:38 PM »
Quote
I would try to get it as close as possible to 191K Ohms.  Just search around for the resistors.  The more wattage the resistors the bigger it will be, U should be fine with 1/8 or 1/4. 

very nice, now i have an idea.. so the bigger the wattage the bigger the resistor size will be.. hehehe...
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Offline TW1NKY

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Re: Sound Reactive question (LM386 combinations)
« Reply #5 on: March 12, 2009, 04:56:54 PM »
No places around here have 191k resistors, so I just use 180k and 11k wired in series. 
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Offline bustinthejustin

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Re: Sound Reactive question (LM386 combinations)
« Reply #6 on: March 12, 2009, 05:10:44 PM »
yea or buy from mouser. shippings like 8 bucks but u can buy lots of other things from them too :)
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Offline mic9

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Re: Sound Reactive question (LM386 combinations)
« Reply #7 on: March 12, 2009, 05:39:33 PM »
Quote from: TW1NKY on March 12, 2009, 04:56:54 PM
No places around here have 191k resistors, so I just use 180k and 11k wired in series. 

so if dont/cant find a 191k, i can combine 180k and 11k in series to get 191k?
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Offline bustinthejustin

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Re: Sound Reactive question (LM386 combinations)
« Reply #8 on: March 12, 2009, 06:41:28 PM »
yup. u can add resistance up.
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Offline ApheX

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Re: Sound Reactive question (LM386 combinations)
« Reply #9 on: March 13, 2009, 03:10:31 AM »
If i'm honest, this type of led mod doesn't work too well on a slim in my opinion. Don't get me wrong, Lordnico's tut is sound and works really well on a phat psp, but I always found that the leds are too bright and don't pulse very much on a slim. you might want to look at folklord36's transistor led mod for your slim. works very well and all you need is one 2n2222 transistor from radio shack or ebay.

Here's the link, Folklord transistor led mod
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Offline TW1NKY

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Re: Sound Reactive question (LM386 combinations)
« Reply #10 on: March 13, 2009, 03:28:54 PM »
I havn't tried the transistor method because I have so many extra lm386s. But from what I've seen it looks nice and simple too.
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Offline bustinthejustin

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Re: Sound Reactive question (LM386 combinations)
« Reply #11 on: March 13, 2009, 06:13:29 PM »
yea i tried mikes soudboard method which is the same as an lm386 method but built into a little board, and i have to say it sorta sucks... i recently just bought some transistors so when they arrive i will test the transistor method...
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Offline Jumbo

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Re: Sound Reactive question (LM386 combinations)
« Reply #12 on: March 13, 2009, 06:32:18 PM »
Ive dont 2n2222 and its MUCH more reactive. And i get 191k and 30k via ebay for cheap :D
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Offline bustinthejustin

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Re: Sound Reactive question (LM386 combinations)
« Reply #13 on: March 13, 2009, 06:56:29 PM »
yea it looks really nice in videos... now to try to figure out that isolate from ground again XD
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Offline pranav41

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Re: Sound Reactive question (LM386 combinations)
« Reply #14 on: March 14, 2009, 02:28:29 PM »
well , i'm gonna try the transistor method soon , but the sad part is ..cant be wired to the wifi switch thats whats holding me back ! gow some switches yesterday gonna link it all up !   surprsisingly all vids i've seen the lm386 on  the phat seems a lot more reactive than the slim !!! ????
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Offline bustinthejustin

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Re: Sound Reactive question (LM386 combinations)
« Reply #15 on: March 14, 2009, 06:22:05 PM »
The lm386 method works quite well on the phat but the slim speakers seem to be different...
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Offline Blazinkaos

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Re: Sound Reactive question (LM386 combinations)
« Reply #16 on: March 14, 2009, 09:46:18 PM »
Well this answers my question to cuz i searched at different stores for resistors and as well could not find 191 but i guess series them is the way to go.
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