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2018-02-22 by Mike Burnham
I did a few experiments today Basically the VCO interaction is happening at LFO frequencies. It is probably happening at higher frequencies but I can't hear it and I can't see it on the scope. I can see it on the scope at LFO frequencies. its a very slight pitch modulation. I hav
2018-02-22 by Dave Kendall
The process of elimination is your best bet at this point. A PITA, but the best way to narrow the issue down. I’m assuming you know enough about mains power to do the following - if you’re not sure, don’t do it, or get a trained electrician to do it. Remove all mains connections
2018-02-22 by Richard Brewster
"Even with just 2 oscillators plugged in they affect each other. And connecting more causes worse intermodulation ." When doing this test are the oscillators in a case or sitting on a bench?? If you remove them from the case and do this test, then it will confirm that the problem
2018-02-21 by Mike Burnham
sorry I've asked some of these questions before. I read a lot of Graham Hintons posts on the topic on Muff Wiggler and I am starting to get a better idea. I get confused with reading too much from people not so knowledgable and seeing all kinds of different builds. I should try s
2018-02-21 by Ken Stone
It sounds like your power supply isn't regulating well. Add some low ESR (or dare I say it, tantulums) both at the power supply output and the VCO power inputs. Consider doing something like this for each VCO: http://www.cgs.synth.net/modules/pic/schem_cgs21_super_psycho_r2.gif O
2018-02-21 by Mike Burnham
Hi everyone I am still having problems with oscillators intermodulating each other I changed the power cables to the modules to 22AWG and it makes no difference! So I changed the power supply and fat cables - still no difference! Even with just 2 oscillators plugged in they affec
2018-02-10 by Laurie
You can not (and never should) rely on metal-metal connection. Aluminium oxides the moment it is exposed to air so there is already an insulating layer before you even start. You should also note that you don't need a connection to the screen any way (after all 4mm banana jack sy
2018-02-10 by Mike Burnham
So MOTM uses screened cable Who else uses it? It's not used in modular moog modules 901,902,904 etc Any benefit? Sent from my iPhone On 10 Feb 2018, at 14:51, Richard Brewster pugix@... [cgs_synth] cgs_synth@yahoogroups.com > wrote: Regarding the 0v connection for panel jacks, th
2018-02-10 by Mike Burnham
Ok So making sure each jack sleeve lug has a low resistance path to pcb ground via wire. They are all connected via metalwork to the ground on the next module as well though! But is that insignificant because aluminium/steel etc has a much higher resistance? Sent from my iPhone O
2018-02-10 by Richard Brewster
Regarding the 0v connection for panel jacks, the method used by Synthesis Technology (MOTM) for the 5U modules is to run a shielded cable from the PC board out to each jack.� The shield is connected to 0V on the PC board and to the sleeve lug on the jack.� Point being that th
2018-02-10 by Mike Burnham
When I built my modular I was in such a rush to get it built I made no plans as regards layout, ergonomics, power and grounding and I placed modules next to each other as I built them and hooked them up to power supplies with whatever wire I had around. When I finished a 64mu sys
2018-02-09 by Mike Burnham
Thanks guys well both the two types of VCOs are being affected equally. Which probably points to a PSU or distribution problem. I must admit to harness these modules to the power I used some pretty crap wire. Thick sleeve thin strands. What is recommended as the best cable/wire t
2018-02-09 by Dave Kendall
Agree with Richard Brewster that power should be looked at. . . As well as investigating the power supply, one easy thing you can do is to improve the power input conditioning of EFM VCOs. If built as stock, they have only 100nF bypass caps on the power inputs. It’s possible in m
2018-02-09 by Richard Brewster
It is probably due to power issues. The first place to start troubleshooting is power distribution and the supply itself. Can you give more information? It could be as simple as that you are overtaxing the power supply. Richard Brewster http://pugix.com On 2/9/18 10:23 AM, Mike B
2018-02-09 by Mike Burnham
All my oscillators in my Modular system to some extent bleed into each other and you can hear modulation when listening to pure waveforms. How can I avoid this or clean them up? I have 3 cgs VCOS and 3 EFM vcos I presume i need to use shielded cable to the outputs and have the sh
2018-02-04 by mauro.tondini
Yes, sorry, the 10 k lin value is in the wiring diagram.. Thank you for the suggestion. Cheers
2018-02-03 by cg_synth
Probably Clock and Data. All the same, you may find Set/Reset just as useful. Balance pots are 100k in both the bom and the schematic.
2018-02-03 by mauro.tondini
Hi, i'm building the CGS 121 Quad comparator and Memory Cells, i have not muck space in my panel, so i would configure it with two comparators and the two cells as flip flops For this configuration do you suggest to wire CLOCK and DATA or SET and RESET? Also: which is the right v
2018-02-02 by Ken Stone
should have. On Fri, Feb 2, 2018 at 5:03 PM, Neil Baldwin neil.a.Baldwin@... [cgs_synth] cgs_synth@yahoogroups.com > wrote: These should have enough mA? https://www.tme.eu/gb/details/ dke10a-12/dcdc-converters/ mean-well / Sent from BlueMail On 1 Feb 2018, at 22:50, "Ken Stone ot
2018-02-02 by Neil Baldwin
These should have enough mA? https://www.tme.eu/gb/details/dke10a-12/dcdc-converters/mean-well / Sent from BlueMail On 1 Feb 2018, at 22:50, "Ken Stone otherunicorn@... [cgs_synth]" cgs_synth@yahoogroups.com > wrote: Some sort of DC to DC converter brick, I guess. On Thu, Feb 1,
2018-02-01 by Ken Stone
Some sort of DC to DC converter brick, I guess. On Thu, Feb 1, 2018 at 5:00 PM, Neil Baldwin neil.a.Baldwin@... [cgs_synth] cgs_synth@yahoogroups.com > wrote: I'd like to build myself a couple of standalone Matrix Mixers (using the 4x4 Euro board sets) but I was wondering what th
2018-02-01 by Neil Baldwin
I'd like to build myself a couple of standalone Matrix Mixers (using the 4x4 Euro board sets) but I was wondering what the best way would be to derive the negative side of the power supply if trying to power them with a DC wall-wart type of power adapter? Neil Sent from BlueMail
2018-01-31 by Ken Stone
Odd! Well, I'm glad you got it going again. Cheers, Ken On Thu, Feb 1, 2018 at 4:15 AM, Mike Burnham mikejburnham@... [cgs_synth] cgs_synth@yahoogroups.com > wrote: Fixed! In stead of a lm358 I had put a tl072 for clock input. I changed it to a lm358 and it works perfectly I neve
2018-01-31 by Mike Burnham
Fixed! In stead of a lm358 I had put a tl072 for clock input. I changed it to a lm358 and it works perfectly I never noticed an opamp changing spec over time but it seems to have changed. Weird! All good in the hood! On 31 Jan 2018, at 16:26, Mike Burnham mikejburnham@... [cgs_sy
2018-01-31 by Mike Burnham
It is triggering on both positive and negative going edges of pulse or square from Utility LFO and just negative of some other clocks From: cgs_synth@yahoogroups.com on behalf of Mike Burnham mikejburnham@... [cgs_synth] Sent: 31 January 2018 14:07:15 To: cgs_synth@yahoogroups.co
2018-01-31 by Mike Burnham
My CGS 07 gate sequencer which has been working so well for a decade has suddenly become faulty Its as if all outputs are stuck in full position would that be a faulty 4081 in the output buffers?
2018-01-24 by Ken Stone
It is. To make it longer, try adding a 100n or even greater cap across the 47k resistor that is between the base and emitter of the NPN. Increasing the 47k to 100k would also help, once the cap has been added. The make the signal hotter, replace the 2k2 in the output divider with
2018-01-24 by Mike Burnham
But the All Event Pulse is a trigger right? Sent from my iPhone On 23 Jan 2018, at 23:16, Ken Stone otherunicorn@... [cgs_synth] cgs_synth@yahoogroups.com > wrote: The "pulse out" outputs on the programmer should remain high for as long as the stage is selected and the LED is lit
2018-01-23 by Ken Stone
The "pulse out" outputs on the programmer should remain high for as long as the stage is selected and the LED is lit. On Wed, Jan 24, 2018 at 9:34 AM, Mike Burnham mikejburnham@... [cgs_synth] cgs_synth@yahoogroups.com > wrote: I have built the programmer with 16 steps. it works
2018-01-23 by john slee
If by trigger input you mean a very short, fixed-width pulse... why not build a CGS24 or two? (and don't make the same dumb mistake I made, installing a TL072 in place of the LM358 specified by Ken. Thankfully the pinout is the same!) John On 24 January 2018 at 09:34, Mike Burnha
2018-01-23 by Mike Burnham
I have built the programmer with 16 steps. it works fine but the trigger output is quite low in amplitude and very short. Is this true to the design or some kind of fault in my assembly? I don't have any envelope generators that take a trigger input so its very difficult to shape
2017-12-30 by Paul Bower
You could try the Muff Wiggler or Electro Music forums On 30 Dec 2017, at 13:00, Ken Stone otherunicorn@... [cgs_synth] cgs_synth@yahoogroups.com > wrote: no. You can leave that GND disconnected. It is already connected to 0V by the other traces. I've helped you as much as I can,
2017-12-30 by Ken Stone
no. You can leave that GND disconnected. It is already connected to 0V by the other traces. I've helped you as much as I can, and have no idea what is wrong. I suggest you try to find another SDIYer in your area to have a look at it. On Sat, Dec 30, 2017 at 10:09 PM, pigeonsmusik
2017-12-30 by pigeonsmusik
LA is connected to the anode (+) of the led and LC to the cathode(-) of the led. seems right. My SPDT switch is connected OF to top, CO to middle and LF to bottom of the switch. that seems right too. do i have to connect the GND next to the OUT to the ground since I'm using banan
2017-12-30 by pigeonsmusik
LA is connected to the anode (+) of the led and LC to the cathode(-) of the led. seems right. My SPDT switch is connected OF to top, CO to middle and LF to bottom of the switch. that seems right too. do i have to connect the GND next to the OUT to the ground since I'm using banan
2017-12-29 by Ken Stone
A buzz in your fingers? that is worrying. Either you have very sensitive fingers, or there is something seriously wrong with your power supply. Are the LEDs in backwards? Do you have a common 0V between this module and the rest of your synth? On Sat, Dec 30, 2017 at 2:53 AM, pige
2017-12-29 by pigeonsmusik
yes got that fixed… On 29 Dec 2017, at 22:37, "'Dave' dave@... [cgs_synth]" cgs_synth@yahoogroups.com > wrote: Looks like the purple wire to GS has become detached... On 29 December 2017 at 11:23:30 -23:00, pigeonsmusik pigeonsmusik@... [cgs_synth] cgs_synth@yahoogroups.com > wro
2017-12-29 by Dave
Looks like the purple wire to GS has become detached... On 29 December 2017 at 11:23:30 -23:00, pigeonsmusik pigeonsmusik@yahoo.de [cgs_synth] wrote: Hi Ken, thanks for your speedy reply. here is the pic… of the board and the wiring… yes i was aware of not needing a cable for the
2017-12-29 by pigeonsmusik
connected up the 1k resistors to RL … I'm using yellow leds rated at 20mA, 2.3 volts for the oscillators. Tried both 640k and 1k resistors at the first led.. but still doesn't light up. when i touch the anode side of it though, it lights up.. but i get a buzz in my fingers. I'm u
2017-12-29 by Ken Stone
You have left out all of your LED resistors RLED. You need to chose the value of those to suit the LEDs you are using. On Fri, Dec 29, 2017 at 10:23 PM, pigeonsmusik pigeonsmusik@... [cgs_synth] cgs_synth@yahoogroups.com > wrote: > > > Hi Ken, > > thanks for your speedy reply. >
2017-12-29 by pigeonsmusik
Oh no!!! Yes ur right…. I didn't understood what RL stood for…. now i see the problem after referring to the schematics and the tracks on the board! thanks for pointing that out and thanks for the help. Will hook it up… hopefully (fingers crossed) that it will work! best D On 29
2017-12-29 by Paul Bower
Should there be 1K resistors in the RL positions ? On 29 Dec 2017, at 11:23, pigeonsmusik pigeonsmusik@... [cgs_synth] cgs_synth@yahoogroups.com > wrote: Hi Ken, thanks for your speedy reply. here is the pic… of the board and the wiring… yes i was aware of not needing a cable for
2017-12-29 by pigeonsmusik
Hi Ken, thanks for your speedy reply. here is the pic… of the board and the wiring… yes i was aware of not needing a cable for the 0v part but since it doesn't work, i thought it might be some grounding issues. best D On 29 Dec 2017, at 19:05, "Ken Stone otherunicorn@gmail.com [c
2017-12-29 by Ken Stone
No doubt a construction error, but your description does not give enough info. Try posting or emailing me a photo. You do not need a link between the 0V holes above the 100uF caps - that is a point where you can access 0V in case you need to wire something to it. The link will no
2017-12-29 by pigeonsmusik
Hi, I need some help in getting the SPM to work. I've soldered up all the components and pots and the links and even added a link at the 0v above the 100uf caps. When I power up the unit, the leds don't blink and unless I touch one side of the cable linking to the led, on the end
2017-10-07 by Sean Ellis
It's good to run pots and sensitive parts of the VCOs off some internal regulators rather than relying on the power rails. Opamps can be powered from any supply but not the voltages used for setting pitch and the comparator trip point in particular. You can usually isolate those
2017-10-06 by Ken Stone
VCOs on their own PSU can be good. VCAs and VCFs may pick up clicks off noisy power rails, but are unlikely to be affected to the same extent as a VCO. Shielded cable will not help. Extra caps on the VCOs, and thicker power wires may help. Having their own wires that run back to
2017-10-06 by Mike Burnham
I recently built a few more PSUs for my modular but I noticed the other day that the VCOs are ever so slightly unstable and seem to be modulated by other stuff on the power rail. I notice that Yusynth designed an oscillator with onboard regulators because of this problem. I made
2017-10-04 by Ken Stone
They may do the job. Just measure the voltage drop of them using the diode test function of your multimeter. Pick two with the same voltage. On Wed, Oct 4, 2017 at 10:51 PM, Mike Burnham mikejburnham@... [cgs_synth] cgs_synth@yahoogroups.com > wrote: Yes thanks that makes sense A
2017-10-04 by Ken Stone
Yes, that could be a better way to do it. Take care that they are at the same temperature when you test them - in other words, don't touch them! "To match diodes, try connecting them in series with a 10k resistor across 10 to 15 volts, and measuring for identical drops across the