LM 387

[Edu Silva]

De: Guido Goebertus <guidogoe at xs4all.nl>

> I'm looking for a replacement for a LM 387. I don't know anything about
this chip, but my best quess is that it's a dual LM 386.

The LM386 is a power amp. LM387 is a low noise audio preamp, similar to the
LM381, but in a 8 pin DIP pack.

> Anyway, the replacement should have better noise performance, being a
preamp for a 16 bit ADC, and it must have the same pinout.

According to National, there's no replacement. The IC expired last year, so
it's still possible to find it somewhere.

> I have a couple of NE 5532 chips and I was wondering if that would be an
improvement? Any suggestions?

Better specs, no doubt, but the pinout isn't the same. I can make a small
PCB with a socket to the 5532 and long pins to fit in the original holes. 

The pinout of the 387:

V+	6
GND	3  (it's a single-supply unit)
IN-	2, 7
IN+	1, 8
OUT	4, 5

As the 387 is a single supply preamp, you'll have some fun modding the
circuit to use the 5532.

Edu

______________________
ES2 Audio -- Som & Luz
Salvador - BA - Brasil