From analogue-request@magnus.acs.ohio-state.edu Thu Apr 8 17:01:27 1993 Received: by quark.magnus.acs.ohio-state.edu (5.65/3.910213) id AA11664; Thu, 8 Apr 93 17:01:14 -0400 Errors-To: analogue-request@magnus.acs.ohio-state.edu Sender: analogue-request@magnus.acs.ohio-state.edu Received: from uucp1.UU.NET by quark.magnus.acs.ohio-state.edu (5.65/3.910213) id AA11659; Thu, 8 Apr 93 17:01:13 -0400 Received: from korgrd.UUCP by uucp1.UU.NET with UUCP (5.61/UUNET-uucp-primary) id AA00863; Thu, 8 Apr 93 17:01:09 -0400 Received: from korgsmtp by korgrd.com (4.1/SMI-4.1) id AA08577; Thu, 8 Apr 93 13:16:51 PDT Message-Id: <9304082016.AA08577@korgrd.com> Date: 8 Apr 1993 13:19:50 -0800 From: "Dan" Subject: Re: WANTED- Part for Korg To: "Peter Cassidy" Cc: "Analog Heaven" Status: OR Reply to: RE>WANTED: Part for Korg Peter Cassidy writes: > Does anyone have, out there, a top octave generator for a Korg Delta > or similar? I've tried everywhere and cannot get one. It's an AY-3-0214 > and it works by dividing down a 2 or 1 MHz clock down to 13, properly > spaced frequencies. These are further divided in the Korg to provide > lower octaves. I *can* emulate the circuit by using 74 series gates or similar, > but what a nightmare !!! (How do you do divide-by-451 !!!!!) Korg USA comes through on this one! I just talked to Chris DeGrasse in the service department; they do indeed have the part. Their part number is slightly different - AC-30214 - and the price is slightly high at $57. You can order the part through Korg USA at: Korg USA 89 Frost Street Westbury, NY 11590 USA (516) 333-8737 - Dan Phillips From analogue-request@magnus.acs.ohio-state.edu Thu Apr 8 15:28:26 1993 Received: by quark.magnus.acs.ohio-state.edu (5.65/3.910213) id AA06842; Thu, 8 Apr 93 15:28:13 -0400 Errors-To: analogue-request@magnus.acs.ohio-state.edu Sender: analogue-request@magnus.acs.ohio-state.edu Received: from enet-gw.pa.dec.com by quark.magnus.acs.ohio-state.edu (5.65/3.910213) id AA06837; Thu, 8 Apr 93 15:28:12 -0400 Received: by enet-gw.pa.dec.com; id AA20903; Thu, 8 Apr 93 12:28:10 -0700 Message-Id: <9304081928.AA20903@enet-gw.pa.dec.com> Received: from ranger.enet; by decwrl.enet; Thu, 8 Apr 93 12:28:11 PDT Date: Thu, 8 Apr 93 12:28:11 PDT From: I've been stolen by a gypsy. 08-Apr-1993 1526 To: "peterc@comm.mot.com"@us1rmc.enet.dec.com Cc: analogue@magnus.acs.ohio-state.edu, eirikur@ranger.enet.dec.com Apparently-To: analogue@magnus.acs.ohio-state.edu Subject: RE: WANTED: Part for Korg Status: OR Check to see if it is pin-out compatible with the Mostek 5024 (???) top octave chip. That was a popular one and you can find articles on building things with it. Mostek *might* even still have a data sheet on it. Eirikur From analogue-request@magnus.acs.ohio-state.edu Thu Apr 8 08:10:04 1993 Received: by quark.magnus.acs.ohio-state.edu (5.65/3.910213) id AA12998; Thu, 8 Apr 93 08:09:47 -0400 Errors-To: analogue-request@magnus.acs.ohio-state.edu Sender: analogue-request@magnus.acs.ohio-state.edu Received: from motgate.mot.com by quark.magnus.acs.ohio-state.edu (5.65/3.910213) id AA12993; Thu, 8 Apr 93 08:09:46 -0400 Received: from pobox.mot.com ([129.188.137.100]) by motgate.mot.com with SMTP (5.65c/IDA-1.4.4/MOT-2.13 for ) id AA17600; Thu, 8 Apr 1993 07:09:45 -0500 Received: from comm.mot.com (il02dns1.comm.mot.com) by pobox.mot.com with SMTP (5.65c/IDA-1.4.4/MOT-2.12 for ) id AA17571; Thu, 8 Apr 1993 07:09:44 -0500 Received: from dub-tse ([145.21.14.7]) by comm.mot.com (4.1/SMI-4.0) id AA06767; Thu, 8 Apr 93 07:09:39 CDT Message-Id: <9304081209.AA06767@comm.mot.com> Received: by dub-tse (16.6/16.2) id AA10241; Thu, 8 Apr 93 13:06:30 +0100 From: Peter Cassidy Subject: WANTED: Part for Korg To: analogue@magnus.acs.ohio-state.edu Date: Thu, 8 Apr 93 13:06:27 BST Mailer: Elm [revision: 66.25] Status: OR Hi all, Does anyone have, out there, a top octave generator for a Korg Delta or similar? I've tried everywhere and cannot get one. It's an AY-3-0214 and it works by dividing down a 2 or 1 MHz clock down to 13, properly spaced frequencies. These are further divided in the Korg to provide lower octaves. I *can* emulate the circuit by using 74 series gates or similar, but what a nightmare !!! (How do you do divide-by-451 !!!!!) The Korg Delta is quite an amazing machine (fully polyphonic, with a separate 'strings' and 'synth' section). BTW It's not mine, it's Steven Collins's, who is also on this list. -- Regards, Peter ------------------------------------------------------------------------------ | M O T O R O L A B . V . I R E L A N D | | ----------------------------------------- | | Peter Cassidy - T.S.E Dublin | Phone : 353-1-840-8866 Ext. 417 | | MACCVM : C10404 | X400 : peterc@comm.mot.com | ------------------------------------------------------------------------------ From analogue-request@magnus.acs.ohio-state.edu Thu Apr 8 16:10:43 1993 Received: by quark.magnus.acs.ohio-state.edu (5.65/3.910213) id AA08978; Thu, 8 Apr 93 16:09:56 -0400 Errors-To: analogue-request@magnus.acs.ohio-state.edu Sender: analogue-request@magnus.acs.ohio-state.edu Received: from ncar.ucar.edu by quark.magnus.acs.ohio-state.edu (5.65/3.910213) id AA08970; Thu, 8 Apr 93 16:09:51 -0400 Received: from stout.atd.ucar.edu by ncar.ucar.EDU (5.65/ NCAR Central Post Office 03/11/93) id AA07922; Thu, 8 Apr 93 14:09:48 MDT Message-Id: <9304082009.AA17761@stout.atd.ucar.EDU> Received: from barleywine.atd.ucar.edu by stout.atd.ucar.EDU (5.65/ NCAR Mail Server 04/10/90) id AA17761; Thu, 8 Apr 93 14:09:42 MDT To: analogue@magnus.acs.ohio-state.edu Subject: top octave chip Date: Thu, 08 Apr 1993 14:09:40 -0600 From: Forrest Cook Status: OR Erikur suggested using a Mostek, 5024 chip to replace another top octave chip. Unfortunately, Mostek went feet-up several years ago. I'm not sure if anybody bought the remnants and kept making the chips. There was a company that specialized in old chips, you could post to sci.electronics and ask if anybody there remembers the name of the company, I don't seem to have it in my docs. Also, I've been scraping solder masks off of traces and soldering to them for years with no troubles. The only time that could be a problem is if you are planning on using your synth on the beach where there's lots of salt in the air. Chances are that the keyboard switches would go first in that kind of environment. Lastly, has anybody ever played with a VCP? (Voltage Controlled Panner) I experimented with a home made model a while ago and it was lots-O-fun. Basically it consists of a couple of GE H11F1 analog optoisolators driven by an inverting and a non-inverting op-amp. Digi-Key sells the H11F1. Unlike normal opto-isolators, the H11F1 has an LED and a JFET and gives you a nice variable resistance that is proportional to the LED current input. One problem I had was that the response of the panner tended to vary the volume down when it was in the center, I always wanted to play with some kind of exponential converter between the op-amps and the LEDs. If you control the clock rate of a digital delay line with the same voltage that controlls the DCP, you get a nifty sounding doppler-shift effect in stereo. Way Cool. Forrest Cook cook@stout.atd.ucar.edu WB0RIO {husc6|rutgers|ames|gatech}!ncar!stout!cook From analogue-request@magnus.acs.ohio-state.edu Wed Apr 7 20:49:59 1993 Received: by quark.magnus.acs.ohio-state.edu (5.65/3.910213) id AA28939; Wed, 7 Apr 93 20:49:47 -0400 Errors-To: analogue-request@magnus.acs.ohio-state.edu Sender: analogue-request@magnus.acs.ohio-state.edu Received: from ncar.ucar.edu by quark.magnus.acs.ohio-state.edu (5.65/3.910213) id AA28934; Wed, 7 Apr 93 20:49:45 -0400 Received: from stout.atd.ucar.edu by ncar.ucar.EDU (5.65/ NCAR Central Post Office 03/11/93) id AA21090; Wed, 7 Apr 93 18:49:44 MDT Message-Id: <9304080049.AA06718@stout.atd.ucar.EDU> Received: from barleywine.atd.ucar.edu by stout.atd.ucar.EDU (5.65/ NCAR Mail Server 04/10/90) id AA06718; Wed, 7 Apr 93 18:49:43 MDT To: analogue@magnus.acs.ohio-state.edu Subject: zipper effect Date: Wed, 07 Apr 1993 18:49:41 -0600 From: Forrest Cook Status: OR Hmmm, I'm using a 16 bit DAC which puts out -10V to +10V for 0 to 65535 on the input. Your example said that a 5 octave swing in 1/4 sec was enough to notice a stair step problem. Figuring out a worst case scenario, I get 0-5 Volt swing at 1V/Octave takes 16384 steps, 16385 Steps / 0.25 sec = 65536 steps/sec, each DAC word takes 2 bytes to load from the 6811 so we need to squeeze 131072 bytes/sec out of the cpu. This is probably overkill since the DAC gives you 0.000305 V/step and at 1V/Octave a note change is 1/12V or 0.0833 Volts/note so that gives a slide value of 0.0833/0.000305 or 273 steps per note which is approaching analog nirvana. Unfortunately the CPU probably can't keep up to a 130K byte per second due to the 2mb internal clock and the fact that you probably have to do lots of limit checks and the like in the loop. It might be quite reasonable to reduce everything by a factor of 10, i.e. 27 steps per note and 13Kbytes/sec. The software should be able to handle that and still have enough left over to deal with the midi input queue. I may have to play with this in the code. Forrest Cook cook@stout.atd.ucar.edu WB0RIO {husc6|rutgers|ames|gatech}!ncar!stout!cook