ne570/571 compressor circuits?

loss1234 · Posted: Tue May 27, 2008 5:33 am Post subject: ne570/571 compressor circuits?

just got some ne571's in the mail and i want to try and make some compression circuits. the datasheet is too vague. anyone know of any good circuits using this chip?

thanks

CJ Miller · Joined: Jan 07, 2007 Posts: 368 Location: 127.0.0.1

I've never had any of them myself, as of yet. I do have a booklet from Thomas Henry, called "Making Music with the NE570 Compander", which looks cool. About 20 pages of schematics and lab notes from somebody who has spent some time with these. Which reminds me, if you do some web searches for NE570 you might find more info, I wasn't even aware of the SA570. Another idea is to do a google image search for NE570 and sort through the jpegs it throws you.

I know I've seen these in old samplers and sampling drum machines. Only schem I have somewhere is a Japanese vocoder project which uses them, but I'll need to find it. I'm sure that there is a good amount of old applications info for these out there somewhere.

marr · Joined: Oct 31, 2006 Posts: 33 Location: Texas

PAiA vocoder uses them.

danielwarner · Joined: Dec 18, 2006 Posts: 65 Location: Sacramento

Not a compression circuit, but the Craig Anderton Rocktave circuit calls for a 570 or 571

ericcoleridge · Joined: Jan 16, 2007 Posts: 889 Location: NYC

This chip is also used to compress the incoming signal on the Korg SE500 'Stage Echo' tape delay. I think after the signal is processed, delayed, etc., it's then expanded again before being sent to the output. I think it's used here for noise reduction. I have own one of these tape delays, and have the schematic.

Its probably used on the other Korg tape echo too, the SE300.

loss1234 · Posted: Sat Jun 14, 2008 5:41 pm Post subject:

the rocktave..i have looked a that before and forgot it had a 571

great

whats the korg like?

Luka · Joined: Jun 29, 2007 Posts: 1003 Location: Melb.

hey loss if you decide to use the chip for something else
there is a nice compressor in this circuit that uses the THAT chips

it is from the "boxotrix"

http://burnit.co.uk/sdiy/images/boxotrix/schematic_compressor_small.gif

actually i think seb has some pcb's left
this is a cool machine
i cant wait to build mine

mediatechnology · Posted: Tue Aug 12, 2008 1:18 pm Post subject:

Hey guys there's this old series from TAA and Jung:

http://www.picocompressorforum.com/forum/php/viewtopic.php?f=12&t=150

On Semi still make them:

http://www.onsemi.com/pub_link/Collateral/NE570-D.PDF