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Uses of LM386 without amplification
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nullpainter



Joined: Nov 07, 2011
Posts: 32
Location: Wellington, New Zealand

PostPosted: Thu Mar 15, 2018 3:25 pm    Post subject: Uses of LM386 without amplification Reply with quote  Mark this post and the followings unread

Hi,

Do LM386 chips provide any benefit even if they're not performing amplification?

The output of my circuit is currently between 0-7V. I am intending to use a LM358 to reduce this to line levels and to act as a buffer.

Looking at a few LM386 circuits (particularly the last one on that page), there are some appealing options presented with the LM386 such as bass boost and filtering.

Is there any point in adding a LM386 to my circuit even though I'm not amplifying? Or should I just apply the filtering to the LM358?

M
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PHOBoS



Joined: Jan 14, 2010
Posts: 3873
Location: Moon Base
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PostPosted: Thu Mar 15, 2018 4:35 pm    Post subject: Reply with quote  Mark this post and the followings unread

I think the LM386 can't actually be used without amplification (gain is always >1, I believe even 20) but don't take my word for it,
instead check the datasheet. It's also an amplifier in the sense that it can drive a low impedance with more current than a standard
opamp which you shouldn't need for a line output. I would indeed add the filtering to the LM358 instead or maybe add another opamp
for a 3-band tone control circuit. The quality of an LM358 might also be better than an LM386 although it's not the best opamp for audio.

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nullpainter



Joined: Nov 07, 2011
Posts: 32
Location: Wellington, New Zealand

PostPosted: Thu Mar 15, 2018 6:47 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thanks PHOBoS, perfect. Much appreciated.
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AlanP



Joined: Mar 11, 2014
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PostPosted: Thu Mar 15, 2018 8:48 pm    Post subject: Reply with quote  Mark this post and the followings unread

There are heaps of LM386 distortions in the guitar pedal world -- diystompboxes have a bunch of threads.
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nullpainter



Joined: Nov 07, 2011
Posts: 32
Location: Wellington, New Zealand

PostPosted: Thu Mar 15, 2018 11:28 pm    Post subject: Reply with quote  Mark this post and the followings unread

Cheers Alan, good to know. Although if I go down the rabbit hole of adding distortion, I fear I'll never get this damn thing finished!
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