Hmm...I am going to have to get the schems from Kawai - I will also do some research on how to filter a ground. If the analog ground is noisy the op-amps will...
Good information, I enjoyed reading it. ... From: nelsonj_sce To: k5synth@yahoogroups.com Sent: Sunday, October 03, 2004 8:31 PM Subject: [k5synth] Re: How to...
Antdes, Good information in the note below. It sounds like the good news is that the digital (D) and analog (A) have seperate grounds. From everything I have...
Buzzing in rear out is signal ground noise, all pcbs have sepparate analog grounds to PSU but linked together on the psu. ... Today ... to ... on ... directly ...
I got the schems yesterday and I will take a look at the ground issue. Although all grounds will eventually get to a single point, one idea is to make sure the...
Has anyone converted the Kawai K5 sounds (the 9 cards) to K5 Pro Editor format? This seems to be the only editor I am having luck with transfering sounds...
Hi Jeffrey, ... If you send an email directly to me, describing your problems, maybe i can send a debug version to you to get more information about the ...
My MQX-32M(MusicQuest) shows up as a ð{Ð¥=§±^or something like this in the kfuenf editor, while the SBLive S/W synth and joystick ports are OK(The A and B...
Antdes, I just wanted to compare some notes on the schems. I have not had a chance to dig too deep yet but I want to see if you reached some of the same...
That's it, AG is analog ground, DG digital ground, +A6V dc analog 6v. . . The kind of fork for the analog ground is an other sign for ground, maybe they mean...
Antdes, Ok, I still have more work to do but I did look more at the schems while on a plane today. Some thoughts... 1) DO NOT simply remove the DG ground on...
Pulling the DG from the boards not PSU board(Impossible, without removing a bridge rectifier), I've already used the PSU without the big brown connector full...
You wrote: "They connected the non-inverting(+) input(if I'm right) to the DG?!?" Not directly. The schem show that the (+) is connected to the AG, but it...
You told a couple of replies before "I suppose you now have socketed opamps, like me", well I don't have some, I forgot to ask them at the shop. "U1 if you use...
You wrote: "I only use MIX output and headphones" I don't use the MIX now, rather, I stack everything in a Multi to a single output , Out 1 usually. It makes...
Well, in my case, the mixer is pretty niosy too(A Kawai MX8R mixer from the same year), and I've never found Multi louder than Single nor Singles louder than...
Good opamps might not change the noise amout that much. But I know wiaht 2 opamps in parallel are doing with noise is like what 2 resistors in parallel are...
Per one of my earlier notes, I took out my BB opamp part U4 and replaced it with a rewired Tl074 where I lifted the ground pins 3, 5, 10, 12 and rewired them...
Problem can be in the OKI coils, opamps other than U4, or something else. And if you remove the VCAs? (Without cutting the pins) Maybe these are just crappy...
Removing the opamps one by one could help: exampe. You remove the 2nd last opamp and there is no more noise, then noise source is not at final stage. ... -- ...
Hack update: Since my last note I replaced the other two op-amps with socketed Burr Brown OPA4228. Replacing these two other op-amps did reduce noise levels...
JRC makes clones eg. the RC4558 is a TI chip but JRC makes some the VCAs are Mitsubishi, but JRC makes some too, send them an e-mail, they can send you infos...
Could you do a little VU meter test, with mix output if you have changed the opamp for it(The same opamp is for headphones) or single if not, without a noise...
OK - I am note sure this is an apples-to-apples test but here is what I did. I have a Yamaha DSP2416 mixer in my computer. I hooked up my K5 to the mixer and...
My mixer plugged to the line in gives me -55 and my K5 plugged to the line in gives me -55 too. I did the 147k hack but with 150k ones, I got a problem: the...
Also, I get some -47 when the volume isn't even at max. So I'll give a try to these OPA4228, and the 2 chan version in some preamps and DACs. ... the line in...
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