LM386 noise?

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From: Michael Stein (OSYSMAS@MVS.OAC.UCLA.EDU)
Date: Mon Jul 04 1994 - 19:43:54 EDT


I've just put together an audio amplifier using a LM386N (date
code 7636) and using earphones it has a rather loud background
hiss. Is this normal?

This is my first use of this chip and I like the low current
draw (about 4 mA), but the hiss has to go.

I'm using the gain = 20/minimum parts circuit -- no bypass
capacitor on pin 7, no network on output pin 5.

PS: Just to try it, I've got a capacitor mike attached to
    the input, so there aren't any other semiconductors
    except the FET in the mike, and no RF around.


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