Can I substitute SJ4558 for a LM386 ? or am I just wasting time?

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Permalink Reply by Bluesheart on December 27, 2016 at 9:53am

I have a circuit board I pulled out of something and it has several of these SJ4558 chips on it. I 'm wondering if they can be used as a sub for LM386 chips for making small amps? , Or would it just be false economy even if they "should" work? Looking forward for suggestions please.

Permalink Reply by Scott aka Farmer Ted on December 27, 2016 at 3:54pm

In short terms, no. The 4558 has 8 pins like the LM386, but that is the only thing these two IC chips have in common.

Permalink Reply by Bluesheart on December 28, 2016 at 5:40am

Thank you!

Permalink Reply by Kigar on December 27, 2016 at 5:19pm

LM386 chips are 10 for a dollar on ebay.  While the SJ chips could be awesome chips, unless it is a topic you find worthy of personal interest there is no economy in it.

Permalink Reply by Bluesheart on December 28, 2016 at 5:41am

Thank you, that is what I figured.

Permalink Reply by Timothy Hunter on December 27, 2016 at 7:26pm

like others have said the 4558 is a dual amp.  it can be used instead of a LM358. they have the same pinout but may have different gain.

a LM386 is a single amp with a different pinout and vastly different curcuit, so no it cant be a substitute. 

Permalink Reply by Bluesheart on December 28, 2016 at 5:41am

Thank you!

Permalink Reply by John Sawyer on December 27, 2016 at 7:54pm
Permalink Reply by Timothy Hunter on December 28, 2016 at 12:20am

only good for a preamp or buffer circuit.  advantage there is stero in one 8 pin package.... 

or a mic preamp... could work for a piezo if you left out the 10k resistor feeding power to the mic .

Permalink Reply by Bluesheart on December 28, 2016 at 5:42am

OK, wow, thanks for all the info! I'm not THAT motivated!

Permalink Reply by Bluesheart on December 28, 2016 at 5:43am

Thank you!

Permalink Reply by Bluesheart on December 28, 2016 at 5:44am

I did salvage some capacitors that should work as they are the correct numbers.

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