Re: Aftertouch and Portamento
2013-04-03 by chipaudette
If anyone was interested in details of how I used the Arp Speed knob to control the speed of the aftertouch vibrato, feel free to check it out:
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Re: Polysix hard case
2013-04-02 by chipaudette
Hi All, I m thinking that I now need a case for my Polysix, as well. The key challenge is finding one that is the right size, especially one that is tall
Re: [PolySix] Re: Please don't tell me battery leak.
2013-03-28 by Peter Mörck
The baking soda fix myth should be killed :) Baking soda is a base. The electrolyte in NiCad batteries is alkaline, i.e. a base. I can t see how a base would
Re: Aftertouch and Portamento
2013-03-28 by djangowes
Hi Chip, fantastic job man! It works great : aftertouch and portamento are awesome add-ons on this lovely synth. Congrats! Ed.
Re: Please don't tell me battery leak.
2013-03-28 by alesisfusion8hd
I had a NiCd leak on my Trident MKII; the corrosion also caused chips to have bad contacts with their sockets. Check. Also, you have to stabilize the
RE: [PolySix] Please don't tell me battery leak.
2013-03-28 by backshall1
From the photos, this board does have some battery leak damage, and it looks like quite a bit of repairs have been done already. The original board only has 3
Aftertouch and Portamento
2013-03-28 by chipaudette
Hi All, My efforts to add aftertouch to my Polysix have finally reached the point where she plays! And, as a bonus for adding the pitch control circuitry to
Please don't tell me battery leak.
2013-03-28 by pechnatunkagain
Hi, I m also new here - so Hello Everybody! I ve been overseas - away from my Poly for almost 2 years... I went to a lot of trouble when storing it - wrapped
silent voice
2013-03-27 by stienba
Hello I m currently fixing my polysix and there is two problems remaining: First: My polysix is now a polyfive :-) It works but with only 5 voices and that
Re: [PolySix] New member want to send messages
2013-03-27 by Ben Stuyts
Hi Bastien, Welcome to the group, go ahead! Ben
New member want to send messages
2013-03-27 by GRUEL Bastien
Hello I just bought a polysix, I need to send messages to try to repair it. Thanks [Non-text portions of this message have been removed]
Re: [PolySix] Arduino Replacement of the 8049 Key Assigner
2013-03-24 by Ben Stuyts
Hi Chip, very cool project! Enjoying your progress reports and I d love to see a vid when you have the aftertouch running. Ben
Re: Arduino Replacement of the 8049 Key Assigner
2013-03-23 by chipaudette
Now I ve added a DAC to my Arduino so that I can generate arbitrary pitches, including those between real notes. Now I m on the way to smooth pitch bends
Re: Replacing the Keybed
2013-03-21 by chipaudette
Now I ve boosted up the keybed and integrated the key-scanning electronics. http://synthhacker.blogspot.com/2013/03/polysix-boosting-new-keybed.html Aftertouch
Re: Arduino Replacement of the 8049 Key Assigner
2013-03-17 by chipaudette
For anyone that s interested, here s a video of the new keybed connected to the Arduino and driving the Korg Polysix...
Re: Arduino Replacement of the 8049 Key Assigner
2013-03-17 by chipaudette
I ve got a question about the capacity of power supply in the Polysix... With the addition of the Arduino, and with the addition of another microcontroller
Re: Replacing the Keybed
2013-03-17 by chipaudette
Here s my next step...making up the cabling between the new keybed and the new keybed s controller. I followed the lead of the Keyparts UK folks, who
Replacing the Keybed
2013-03-16 by chipaudette
I m continuing to make progress in my efforts to replace the stock keybed in my Polysix with an aftertouch and velocity sensitive Fatar keybed. The only people
Arduino Replacement of the 8049 Key Assigner
2013-03-12 by chipaudette
Hi All, I ve resumed work on adding aftertouch and velocity sensitivity to my polysix. As I discussed earlier, my first step is to replace the 8049 key
Calibration Troubleshooting
2013-03-06 by anthonyputz
I recently built one of Jed s klm-367 boards that I m trying to troubleshoot. I m newer to fixing electronics but have most of the basic to intermediate
Re: Trannies for Jed's Board
2013-03-06 by raisinbag69
Thanks. Board seems to be functioning though I gave to spend some time calebrating. Only thing I m uncertain about is test switch. Which way does it go. One
Re: Trannies for Jed's Board
2013-03-05 by raisinbag69
Thanks Don, I ll trace legs on old board and try route of using old ones. I think I have 2sc945 here as well, so I can always go that route if need be. Cheers
RE: [PolySix] Trannies for Jed's Board
2013-03-05 by backshall1
You must be very careful using 2sc or 2sk transistors in place of 2N. The pins are usually different. EBC on 2N and ECB on 2SC. If you are prepared to install
Trannies for Jed's Board
2013-03-05 by raisinbag69
Ok I m almost finished my rebuild of battery corroded board using Jed s replacement. All that is left are transistors to solder in. Following his BOM it
Re: Compressor/Expander Circuit?
2013-03-04 by chipaudette
For the LM13600 datasheet example, I can get: Vo/Vi = 1739 * Iabc or I can get: Vo/Vi = 870 * Iabc or, stretching, I can even get: Vo/Vi = 1948 * Iabc But I
Re: Compressor/Expander Circuit?
2013-03-04 by chipaudette
Hi Johannes, If you re willing to explain your calculation of LM13600 gain, you can give the explanation in whatever forum you d like! If you post it here,
Re: [PolySix] Re: Compressor/Expander Circuit?
2013-03-03 by Johannes Hausensteiner
Hi Chip, I just finished watching the movie The Cincinnati Kid . Whereas in former years I would identify more with Steve McQueen nowadays I tend more to the
Re: Compressor/Expander Circuit?
2013-03-03 by chipaudette
What I find so difficult about the LM13600 is my inability to calculate what the transconductance should be for a given circuit configuration. For the VCA
Re: [PolySix] Re: Compressor/Expander Circuit?
2013-03-03 by Johannes Hausensteiner
The LM13600 as VCA works without (negative) feedback. If you think about it this makes sense. The operational amplifier with negative feedback forms a control
Re: Compressor/Expander Circuit?
2013-03-02 by chipaudette
OK, I took some measurements of the resonance-controlled VCA. You can see my data and analysis here...
Re: Compressor/Expander Circuit?
2013-03-02 by chipaudette
Well, I still think that it s a VCA, but I found that the gain goes *up* with increasing resonance. The gain increases until you reach a value of about 4 on
Re: Compressor/Expander Circuit?
2013-03-02 by chipaudette
Hi Johannes, ... Looking at the schematic, I believe that this LM13600 (the first half of IC20) is actually wired as a Voltage Controlled Amplifier, not as a
Re: [PolySix] Re: another tuning problem :)
2013-03-01 by Murray
It could still be the Q12 and a meter wouldn t pick up the fact that it is no longer tracking correctly. Also changing the TL072 (IC17) would be a good move.
Re: some preset noisy
2013-03-01 by rafeek.2010
hi, now is good , I have found a bad 4558 op amp on klm367 ic 11 !! thanks raf
Re: another tuning problem :)
2013-03-01 by rafeek.2010
hi , transistor Q12 seems to be good (measure diode), the manual kiwisix is full of extra information thx, but I still not have a good tune , all seems good
Re: [PolySix] Re: Compressor/Expander Circuit?
2013-02-28 by Johannes Hausensteiner
Hi! Yes it is possible to build resonant filters with LM13600. With the current 2-stage design this probably will not sound what you are expecting. The rolloff
Re: Compressor/Expander Circuit?
2013-02-28 by chipaudette
Oh, and as another reply to my own reply... Can one make an LM13600-based VCF be a *resonant* filter? If I wanted to use it as some sort of global VCF for
Re: Compressor/Expander Circuit?
2013-02-28 by chipaudette
To clarify my own post...of course one could never get the LM13600 VCF to do FM effects. I was getting a little too excited when I said that. I should have
Re: Compressor/Expander Circuit?
2013-02-28 by chipaudette
Hi Johannes, Thanks for the outstanding reply! I hadn t yet done much snooping into the effects circuits themselves (just the VCF following the
Re: Compressor/Expander Circuit?
2013-02-28 by chipaudette
Hi All, I measured the current control and frequency response of this LM13600 VCF. If you re interested in data and graphs, check out:
Re: [PolySix] Re: Compressor/Expander Circuit?
2013-02-27 by tim p
just have to say I am quite amazed by the technical know-how of list members and time and care they spend in sharing it. I salute you! :0) ... [Non-text
Re: [PolySix] Re: Compressor/Expander Circuit?
2013-02-27 by Johannes Hausensteiner
Hi, The part of the schematic you posted in you blog clearly is a voltage controlled low pass filter, 2 stages, therefore 12dB/oct. They had such circuits in
Re: [PolySix] another tuning problem :)
2013-02-27 by Murray
try changing Q12. Check page 24 of the Kiwisix Upgrade manual for sources of these and other things to try. MH ... -- Kind Regards Murray
another tuning problem :)
2013-02-27 by rafeek.2010
hello all, after several attempts to tune the KLM366 (tuning infos from this Blog ) I decided to replaced the famous PC1 P1501 chip with a VTL5C3 and change
Re: Compressor/Expander Circuit?
2013-02-26 by chipaudette
Thanks for the added insight! Specifically with regards to the impact of the Effect Off signal, I did not find that necessarily forced the LM13600 VCF to be
Re: Compressor/Expander Circuit?
2013-02-26 by chipaudette
With respect to my interpretation that the input stage to the gain control is railed at 15V... Well, by examining the actual circuit that s in my Polysix, I
Re: [PolySix] Compressor/Expander Circuit?
2013-02-26 by The Old Crow
The circuit is a dBx-style noise shaper: the more amplitude the dry signal provides, the wider the response of the filter. This squelches MN3005 noise at low
Re: Compressor/Expander Circuit?
2013-02-25 by chipaudette
Looking at the LM13600 data sheet, down through all the example circuits, this use of the LM13600 does NOT match the circuit shape of a VCA. The negative
Compressor/Expander Circuit?
2013-02-25 by chipaudette
Hi Folks, Based on a previous post regarding frequency response of the synth s output, Johannes suggested that I check out the compressor/expander circuit on
Re: [PolySix] Re: Polysix patch memory/buttons not working
2013-02-23 by Murray
that s not corrosion, that is flux from messy soldering. It can be cleaned off by cleaning with IsoPropyl Alcohol. MH ... -- Kind Regards Murray