The LM383 Story

#1

Post by ksikka » Mon, Nov 05, 2018, 5:36 PM UTC

The LM383 Story
idea2ic.com

Re: The LM383 Story

#2

Post by Taniwha » Mon, Nov 05, 2018, 6:17 PM UTC

ha! make sure you read the last paragraph

Re: The LM383 Story

#3

Post by gnarbarian » Mon, Nov 05, 2018, 6:38 PM UTC

I love the design (or lack thereof) of this site. Courier font plus the old scans of photocopies make it feel like i'm reading an old xeroxed white paper (in a good way).

Re: The LM383 Story

#4

Post by Koshkin » Mon, Nov 05, 2018, 6:41 PM UTC

Taniwha wrote: post #2

ha! make sure you read the last paragraph

Apparently, the dog, who was prevented from barking, found some other way to have fun...

Re: The LM383 Story

#5

Post by cellularmitosis » Mon, Nov 05, 2018, 6:43 PM UTC

"Either 45Watts to one or 90watts to both appears to pop the plastic off the silicon with out any apparent damage to the chip"

Oooh, found my project for the weekend!

"Now it is no longer possible to do this since the packaging department had redesigned the package"

aww shucks

Re: The LM383 Story

#6

Post by nicolaslem » Mon, Nov 05, 2018, 6:48 PM UTC

I have great memories building small guitar amplifiers out of its little brother the LM386.

Adding just a transistor to handle the high impedance of the guitar and a few cents worth of resistors and capacitors, one could build a tiny amplifier that once plugged to a 12" guitar speaker could make some serious rock'n'roll!

I remember taking most design ideas from this gold mine: https://www.sonelec-musique.com/electronique_realisations.ht... (unfortunately only in French)

Re: The LM383 Story

#7

Post by cellularmitosis » Mon, Nov 05, 2018, 6:49 PM UTC

Fans of this article will also enjoy Ken Sherriff's talk at Supercon last week: https://www.youtube.com/watch?v=TKi1xX7KKOI

Re: The LM383 Story

#8

Post by aidos » Mon, Nov 05, 2018, 6:49 PM UTC

OT but it seems like a good place to ask:

this week I’ve been looking into making a wireless speaker similar to a Sonos play:1. In terms of the streaming mechanism is was going to use a raspberry pi running as a snapclient, wired to a class-d amp board and a, say, 3” driver. I thought I would find a load of projects using a pi + amp + driver in a small box combination, but I must be looking in the wrong place.

Does anyone have any top tips of examples of setting something like this up? What amp / driver combination to use? I’m not looking for anything amazing, and I’m sure round 1 will be a learning experience, but any help appreciated.

Re: The LM383 Story

#9

Post by paulgerhardt » Mon, Nov 05, 2018, 6:53 PM UTC

aidos wrote: post #8

OT but it seems like a good place to ask: this week I’ve been looking into making a wireless speaker similar to a Sonos play:1. In terms of the streaming mechanism is was going to use a raspberry pi running as a snapclient, wired to a class-d amp board and a, say, 3” driver. I thought I would find a load of projects using a pi + amp + driver in a small box combination, but I must be looking in the wrong place. Does a…

HiFiBerry is a good place to start: https://www.hifiberry.com/build/guides/hifiberry-streamer-in...

Re: The LM383 Story

#10

Post by ianhowson » Mon, Nov 05, 2018, 6:56 PM UTC

As a kid, the LM383 had particular appeal: it was the highest-power amp chip available that ran off a 'safe' voltage. I didn't need to do any mains wiring.