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2007-08-15 by Andrew Scheidler
Would 50k pots work? Maybe with a different resistor? (I've got a whole bunch of 50k pots sitting here but only *7* 100k...) And just to make sure I'm understanding correctly: (from the backside with connections on the downside) the pot's left connection to +15 the pot's right co
2007-08-14 by Christian Oncken
Hi All.. I've been lurking for awhile waiting for something like this to come up... I have a similar project that I've been neglecting over the past couple years... its an old Tom G design, a midi controlled gate module, outfitted with pots to turn it into a sequencer. I've had t
2007-08-14 by sasami@hotkey.net.au
Something definitely NOT right here! 100k pot with one end to +15V and the other end to 0V or -15V. The wiper goes through a 220k resistor to the input to limit the range a bit. Ken >I'm working on a Sequential Switch for sequencing. Each of the eight >steps having an LED, a Gate
2007-08-14 by John Mahoney
At 03:51 PM 8/13/2007, Andrew wrote: >I'm working on a Sequential Switch for sequencing. Each of the eight >steps having an LED, a Gate Out jack, and a pot. > >If I use +15v off the PCB (right after the bead), should there be a >resistor between that voltage and the pot? What siz
2007-08-13 by Andrew
I'm working on a Sequential Switch for sequencing. Each of the eight steps having an LED, a Gate Out jack, and a pot. If I use +15v off the PCB (right after the bead), should there be a resistor between that voltage and the pot? What size? I'm guessing there should be since I wir
2007-08-11 by sasami@hotkey.net.au
Install the 330k in the position marked "330k" AND the jumper in the position marked with a solid line, OR Install the 330k in the position with no value specified AND the jumper in the position marked with a dashed line. Pins 1 and 2 of the tube can be swapped by installing them
2007-08-11 by vtl5c3
Hi Ken, I noticed that my rev 1.1 pcbs have some jumper markings next to the tube, on the side where the 330K resistor is. I can't quite tell how they should be populated. Could you explain? Romeo
2007-08-11 by osaiber
Hello, I sale my Vermona PH-16 sixteen stage analog phaser is like new: http://cgi.ebay.es/ws/eBayISAPI.dll? ViewItem&item=160145723281&ssPageName=ADME:L:LCA:ES:31 Kind Regards; Òscar.
2007-08-11 by sasami@hotkey.net.au
Reduce the value of the resistor between pins 1 and 2 of IC4a. This will reduce gain, expanding the control range. Ken >Finally got the wave multiplier built, its a monster and better than I >anticipated (which was a lot). Grinder and the lockhart are running >properly, the trian
2007-08-11 by matthewregula
Finally got the wave multiplier built, its a monster and better than I anticipated (which was a lot). Grinder and the lockhart are running properly, the triangle section seems to function as I understand it should. However, the square is acting strange. I am only passing a signal
2007-08-09 by The Alison Project
From Ken's site, see schematic on page On the first (yellow) run of PCBs, the grid bias resistor (330k) goes to the negative rail. In this position, it causes some distortion of the signal. This can be a good thing. I prefer the resistor in this position when using the unit as a
2007-08-08 by jan@czmok.de
Hi all, some more stuff (modules) added to sell. Actual list at http://blog.czmok.de under "yard sale". Thanks for looking! --jan
2007-08-08 by sasami@hotkey.net.au
Increase the 100k pot to 500k if you haven't already, and use smaller capacitors, such as a 1uF NON-electro. Electros leak current. At very slow speed settings you may find the electro leaking faster than the circuit is charging it. Ken >I am trying to get the Utility LFO to go v
2007-08-08 by squidb0i
Sounds interesting and I do have that board in the cue.. what does this mod do exactly? ~!J! --- In cgs_synth@yahoogroups.com , "thealisonproject" wrote: > > I finished my Dual Tube VCA today, this thing is great. I added the > DPDT switch like mentioned in this topic and there i
2007-08-08 by dgyrickert2
I am trying to get the Utility LFO to go very slow and I am having an issue. I have a switch that selects three different speeds (it's an on- off-on toggle switch) the slowest using a 4.7uf cap. When I select the 4.7uf cap and have the speed knob on the slowest speed (on a triang
2007-08-08 by synthwick
I just finished building the divider&logic, Gated Comp, and a few percussion modules. I just wanted to say that I am very happy with them. They've opened up a new world of possibilities with my synth. (and are increasing my need for cables exponentially) Thanks for the great desi
2007-08-08 by Laurie Biddulph
Hi, Another major improvement was released by Ken yesterday. Replace diodes D201, D204, D207 and D210 with wire links. This will give you substantially increased range and a much better range from the Resonance pot. Best Regards (Mr) Laurie Biddulph Phone: +61 (0)2 4340 0938 Mobi
2007-08-08 by osaiber
--- In cgs_synth@yahoogroups.com , "Laurie Biddulph" wrote: > > Hi Oscar, > > Glad that is sorted out. > > First of all we will attack the noise problem. This is a well documented > problem and there is a small error on the pcb which you need to look at (I > thought I had already
2007-08-08 by sasami@hotkey.net.au
No, only the Euro version is affected. It has twice as many diodes in it as the non-euro version, thus the problem. Ken >Hi Ken, > >Is this also valid for the non-Euro version of the Steiner filter? I >ordered one from you a few days ago and want to know if I should apply >the sa
2007-08-08 by Jorrit Tyberghein
Hi Ken, Is this also valid for the non-Euro version of the Steiner filter? I ordered one from you a few days ago and want to know if I should apply the same patch (I also use 12V). Greetings --- In cgs_synth@yahoogroups.com , sasami@... wrote: > > > Further builds have discovered
2007-08-08 by sasami@hotkey.net.au
Further builds have discovered a problem when running the Euro version of the Steiner design on 12 volts. If you wish to run on 12 volts and find the module hard or impossible to set up due to uncontrollable resonance, short out every third diode in the diode divider chain. It wi
2007-08-07 by Scott Deyo
Hello group, I've got some new CGS Wave Multiplier PCBs, designed by Ken. They're double-sided, w/ board-mounted pots in MOTM spacing, and trimmers for the Real Ring Mod! Check them out at https://bridechamber.sslpowered.com/pcb/cgs/cgs_wavemult_pcb.html Thanks! Scott
2007-08-02 by Andrew Scheidler
On my (not yet completed) Pulse Divider/Logic module I am normalizing one of the AND inputs and one of the OR inputs to the master Clock IN. I think I would be patching the clock into those often anyway, so this will save a couple patch cables... Drew synthwick synthwick@... > wr
2007-08-02 by Laurie Biddulph
Hi Oscar, Glad that is sorted out. First of all we will attack the noise problem. This is a well documented problem and there is a small error on the pcb which you need to look at (I thought I had already advised you of this, but so many things happening lately). Anyway, at one e
2007-08-01 by synthwick
Hello, I already posted this to the SDIY list, but thought I'd put it here too. Sorry for the cross post for those that get both in their emails. I'm trying to layout the panel for the pulse divider and some logic elements. I've never had this sort of module before, but it seems
2007-08-01 by squidb0i
Hi! Just joined the group. Nicetameetcha. =] My CGS boards arrived about a week ago (thanks Ken!)and having finished my first VCO kit (Blacet 2100) I'll be diving into that pile of yum soon. I'm sure I'll have some stupid noob questions, hopefully not too many. ;] Onward, ~!J! ht
2007-08-01 by osaiber
Thanks Laurie. I saw that I made an error, I put the trimpot resistors in wrong places. I have already fixed this. I have been able to calibrate the filter, but the potentiometer of frequency only covers from 40 hz to 1Khz. If I increase the trimpot, I lose low frequencies, for
2007-08-01 by Laurie Biddulph
Hello Oscar, Just a note for you and any CGS readers. The trimpot designators you have used are from my schematics for the Panther version of the circuit. Ken's circuits do not use these designators so you need to cross-reference as follows:- CGS735 (Panther), CGS35E (CGS) P201,
2007-07-31 by osaiber
Hello! I'm newbie in DIY. I just have mounted three synthacon filters. All looks good. I read in the manual but I have not achieved to calibrate the filters with the three trim resistors, P 206, P202 P201 . Can anybody explain in a detailed way how make it? Many Thanks in advance
2007-07-31 by sasami@hotkey.net.au
1k is a good value for ordinary LEDs. If you start using superbright LEDs, you will need higher values (or get some sunglasses). Ken >the dropper Resistor you use for the LEDs is also as mentioned from >andrew 1k ? > >thanks. >HC > > >--- In cgs_synth@yahoogroups.com , sasami@...
2007-07-31 by sasami@hotkey.net.au
>If using a 1A 36V centre tapped transformer, can a 4700uF 35V or 50V be used with no >ill-effect? Yes. No probs with either of these. Ken _______________________________________________________________________ Ken Stone sasami@... Modular Synth PCBs for sale http://www.cgs.synth
2007-07-31 by hitchindave
Hi. I'm finding it hard to source 3300uF electros for the CGS14 ±15V PSU in the UK, without all that minimum order value, £5 shipping stuff...... If using a 1A 36V centre tapped transformer, can a 4700uF 35V or 50V be used with no ill-effect? cheers, Dave
2007-07-31 by lamontanara
the dropper Resistor you use for the LEDs is also as mentioned from andrew 1k ? thanks. HC --- In cgs_synth@yahoogroups.com , sasami@... wrote: > > That would work. It would drop your ourpur pulses to about 6 volts, which > may also be a good thing. You could also run a LED with
2007-07-30 by sasami@hotkey.net.au
They are in. >Restock is expected today. > >Ken > >>hi Ken, >> >>Just wondering when you expect to be getting a new batch of PCBs in? >>I'd really like to make a digital noise module; I've got the shift >>register chip and everything. >> >>Thanks >> >>t >> >> >> >>The CGS Modular
2007-07-30 by synthwick
Hello, I built the drum simulator, and have been playing around with the circuit. I added a pot for the impact sound, as outlined on the web page. It seems to lower the volume for the entire drum sound, rather than just lowering the initial click. This is on a drum tuned fairly l
2007-07-29 by sasami@hotkey.net.au
Restock is expected today. Ken >hi Ken, > >Just wondering when you expect to be getting a new batch of PCBs in? >I'd really like to make a digital noise module; I've got the shift >register chip and everything. > >Thanks > >t > > > >The CGS Modular Synth home page: http://www.cgs
2007-07-29 by tommy_molotov
hi Ken, Just wondering when you expect to be getting a new batch of PCBs in? I'd really like to make a digital noise module; I've got the shift register chip and everything. Thanks t
2007-07-29 by The Alison Project
Thank you Ken, removing the 100N cap between pins 1 and 3 worked... ----- Original Message ----- From: sasami@... To: cgs_synth@yahoogroups.com Sent: Sunday, July 29, 2007 4:44 AM Subject: Re: [cgs_synth] Debugging Gate Sequencer There is also a 100n cap between pins 1 and 3 of t
2007-07-29 by sasami@hotkey.net.au
There is also a 100n cap between pins 1 and 3 of the op-amp, apparently to speed up the transition. Try removing it. It isn't on the schematics. Me thinks it's time this went to version 2. Ken >Alright I figured out my Hold problem, defective toggle (my first one haha)... > >As f
2007-07-28 by The Alison Project
Alright I figured out my Hold problem, defective toggle (my first one haha)... As for the Reset, no luck.... Parts are correct, I tried replaced the 100K with a 330K like you suggested and nothing.... This is a V1.4 board, on the schem (earlier version) after the 15K there is a d
2007-07-28 by sasami@hotkey.net.au
First, I suggest that you have a parts installation error around the reset input. Failing that:- >My reset jack will reset with a gate of approx 10V, the 5V gate outs of say my Sequential Swicth will not reset the module. It should be sensitive to around 2 volts. Try increasing t
2007-07-28 by The Alison Project
I built my Gate Sequencer yesterday and I am having a few problems with it, in Loop mode everything loop wise is working correctly. My reset jack will reset with a gate of approx 10V, the 5V gate outs of say my Sequential Swicth will not reset the module. In Hold mode it is not w
2007-07-27 by sasami@hotkey.net.au
Basic octave down = divide by 2. Anything that gives divide by 2 will work. Digital stuff usually gives a square wave output for divide by 2, so they will sound the same. The difference will be apparent at divide by 4 (2 octs down) though, as the method of generation is different
2007-07-27 by Andrew
For a simple "one octave down" sub oscillator, will the "Pulse Divider/Logic" (CGS36) board do just as well as the "Sub Oscillator" (CGS01)? I know that they both go miles (in different directions) with other features, but for the basic one octave down tone is one pretty much the
2007-07-18 by Mark Rauch
Howdy, Or, find a 15 volt source and ground on the synth and power a schmitt trigger from that. Rig --- In cgs_synth@yahoogroups.com , "Tom Adam" wrote: > > Richard, > Thanks, I was thinking it would be something like this. I've got a > MOTM-320 ready for power up. No need anymor
2007-07-18 by Mark Rauch
Howdy, A +5 volt line from the synth would run the scmitt trigger just fine also. If it's an inverting trigger, of course you'd have to follow it with an inverter/buffer. A very small proto board and your good to go. rig --- In cgs_synth@yahoogroups.com , Richard Brewster wrote:
2007-07-18 by Mark Rauch
howdy, Why not try a battery powered schmitt trigger in betweenthe LFO and the module. Dpending on the frequency, the battery might last quite a while using 3 0r 4 "D" cells. Rig --- In cgs_synth@yahoogroups.com , "Tom Adam" wrote: > > Richard, > Thanks, I was thinking it would b
2007-07-18 by Tom Adam
Richard, Thanks, I was thinking it would be something like this. I've got a MOTM-320 ready for power up. No need anymore for an ADSR to be sacrificed for running the drumsym/cynare. Cheers, ToAd --- In cgs_synth@yahoogroups.com , Richard Brewster wrote: > > The trigger input on t
2007-07-18 by Richard Brewster
The trigger input on the Cynare is AC coupled. It will only work with a square or pulse type waveform. The MOTM-380 has -5V to +5V sine and triangle waveforms only. You need to use a MOTM-390 or other LFO that has square waves. Why did it work with the MOTM-800? Because you diale
2007-07-18 by Tom Adam
I've tested my drum sym and cynare with a MOTM-800 ADSR and they are working fine. But when I connect a MOTM-380 Quad LFO, these modules are not triggerd. Did I do something wrong? I think the LFO gives a -5V to 5V sin or tri signal out. Or was it -2.5V to +2.5V, can't remember n