LM386 Bass Boost Question

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CeaSaR
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LM386 Bass Boost Question

Post by CeaSaR » Wed Dec 12, 2012 5:20 pm

I am looking to make some small gifts this year and have settled on the venerable LM386N-3. One
of the options on the datasheet shows a bass boost between pin 5 and pin 7, using a 0.033 uF cap
and a 10 kOhm resistor. Problem is, I cannot find the 0.033 uF cap on Mouser. What would I need to
change the 10 kOhm resistor to if I used a 0.33 uF cap? My mind is a blank right now and I need to
get the parts ordered soon.

See page 6 of the datasheet above for the available options.

Thanks in advance,
CeaSaR
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dyarker
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Re: LM386 Bass Boost Question

Post by dyarker » Wed Dec 12, 2012 5:52 pm

Or three 0.01uF in parallel and the 10K resistor. Given the tolerances of capacitors, it will be just as close as a single 0.033uF.

Cheers,
Dale Y

sghioto
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Re: LM386 Bass Boost Question

Post by sghioto » Wed Dec 12, 2012 6:44 pm

Page 2 on the gain control section doesn't recommend anything smaller then 10K if pins 1 and 8 are not bypassed. I would keep the components as designed.
Seriously you can't find a .033uf cap from Mouser. :o I just checked their site and found 164 in stock, of different types and manufacturers. The Mouser part no. below should fill the bill.

667-ECQ-V1H333JL

Steve G

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CeaSaR
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Re: LM386 Bass Boost Question

Post by CeaSaR » Wed Dec 12, 2012 10:02 pm

Thanks guys. Didn't want to use multiples and for some bizarre reason, Mouser wouldn't show any 0.033 uF
caps either through search or the value selection when I went straight to the cap section. I tried 4 or 5 times.
Thought I was losing it.

Again, thanks.
CeaSaR
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dyarker
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Re: LM386 Bass Boost Question

Post by dyarker » Thu Dec 13, 2012 7:04 am

Another thought ... if 0.033uF doesn't show on Mouser try 33nF or 33000pF; same value with the decimal point moved.

Cheers,
Dale Y

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CeaSaR
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Re: LM386 Bass Boost Question

Post by CeaSaR » Thu Dec 13, 2012 5:16 pm

I put in what Steve suggested. Lo and behold, there were many to choose from if I got rid of the
space between 0.033 and uF. Even the value selection worked. Strangeness...

CeaSaR
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k7elp60
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Re: LM386 Bass Boost Question

Post by k7elp60 » Sat Dec 15, 2012 3:37 pm

I have about 100 or more .033uF film capacitors. They are rectangle shaped 0.5" by 0.15" by .35 and have 1/2 inch leads. I would be happy to send you a bunch.
Ned

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CeaSaR
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Re: LM386 Bass Boost Question

Post by CeaSaR » Sat Dec 15, 2012 4:00 pm

I thank you for the kind offer Ned. They are only pennies apiece and I only need a few,
so I'm going to get them from Mouser.

CeaSaR
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