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2006-03-17 by sasami@hotkey.net.au
There are two saw outputs, one that uses the capacitor and one that doesn't. Also make sure that you are not using the wave shaper saw output, but the true one. (DC SAW) Ken >Hi, >Sorry, I meant the saw out.. not triangle. (sorry.. I know I should >get my terms straight w/ this s
2006-03-17 by thealisonproject
Hello I am about to order parts for a Wave Multiplier, going thru the list I have seen that the LM3080 is not available and the CA3080 and NTE996 can be the replacement, these also seem to no longer be available from Mouser, can someone give me another option?? Thanks Chris
2006-03-17 by c10h14no2i
In my last message I said "im dieing for help here" I didn't mean to imply that I haven't been getting help. Ken and everyone else has been very helpfull. If we all lived in the same area, I'd take you all out for a drink! This problem is just particularly frustrating, because I
2006-03-17 by c10h14no2i
Hi, Sorry, I meant the saw out.. not triangle. (sorry.. I know I should get my terms straight w/ this stuff.. it was late!) I did tune the miniwave to the CGS VCO and it had the glitch. It made the sine wave shape, but it has a big ole spike in it. Then I put the paia VCO in it.
2006-03-16 by Richard Brewster
I'm a little confused, Scott. You said, "I've tried sending the triangle out of the VCO to a few different wave shapers." The VCO has no triangle out. Are you talking about the ATSO output, which is one of the sine outs? Or are you talking about the SAW out? Can you upload a phot
2006-03-16 by c10h14no2i
I took some fuzzy photos of my scope, so you can see the glitch Im getting. I posted them in a new folder in the file section (vco wavesahape glitch). They are very fuzzy photos, but I think you can see them enough to get the idea. W/ the wave mult, it doesn't matter what shap Im
2006-03-16 by sasami@hotkey.net.au
If the wave shapers are being fed with the glitched sine wave, yes, otherwise probably not, unless whatever output you are using also has a glitch. Check for adequate power rail decoupling. Ken >Hello, >I've tried sending the triangle out of the VCO to a few different wave >shape
2006-03-16 by c10h14no2i
Hello, I've tried sending the triangle out of the VCO to a few different wave shapers. The sine shaper built onto the vco board, the wave multiplier, and now the blacet miniwave. On all of them I get a substantial glitch where the wave crosses the 0v point. It shows up as a spike
2006-03-15 by sasami@hotkey.net.au
>today i re-soldered the other PCB and immediately the syntacon is >working :-) :) _______________________________________________________________________ Ken Stone sasami@... or sasami@... Modular Synth PCBs for sale http://www.blaze.net.au/~sasami/synth/ > Australian Miniature
2006-03-15 by Jan-Ahrent Czmok
On 02.03.2006, at 05:33, sasami@... wrote: > Circuit may vary from current version, but this should help: > > http://www.cgs.synth.net/modules/pic/ > schem_cgs35_syntha_vcf_voltages.jpg > > There WILL NOT be 5 volts after that 220k because the transistors > clamp it > to 0V. > >
2006-03-14 by keith sterling
> > Hi, Sorry it took so long for me to get back to you. I had to take a > few day break from this synth! > > ok, so w/ 1v in I get 7v on pin 14 > w/ 5v in I get 5.01v on pin 14 > > -Scott Awesome, thanks Scott. Keith
2006-03-13 by c10h14no2i
Hi, Sorry it took so long for me to get back to you. I had to take a few day break from this synth! ok, so w/ 1v in I get 7v on pin 14 w/ 5v in I get 5.01v on pin 14 -Scott --- In cgs_synth@yahoogroups.com , keith sterling wrote: > > > > > From: "c10h14no2i" > > > > I can test th
2006-03-12 by c10h14no2i
I just want to say again how great the bi-n-tic is!! Ive been trying NOT to patch it in, but I have so much fun with it, it keeps getting used. Lately Ive been putting an unmodulated VCO, just making a tone, into its input, then putting my 1v/o signal into the bi-n-tic. Sometimes
2006-03-11 by nihiliste9@aol.com
hi, id love to buy your board. let me know when and ill paypal you the money. edward me: edward schultheis ordeish@... (paypal email) -----Original Message----- From: Adam Schabtach adam@... > To: cgs_synth@yahoogroups.com Sent: Thu, 9 Mar 2006 15:54:57 -0700 Subject: [cgs_synth]
2006-03-10 by Laurie Biddulph
Hi Scott, You have those 2 resistors back to front. The 330K should have been replaced with the 270K (although 200K might actually be better) and the 240K should be replaced with the 560K. If you look at the ASM2-VCO you can see what I mean. Note that I have a 200K resistor in pl
2006-03-10 by c10h14no2i
> i just finished the whole cabling > stuff (except the "Waveshape Pot", where i am puzzled up, where to > connect it.. > > middle pin to PCB (SPW) > left side (CCW) to Ground > right side (CW) to SP+ > > am i right with this assumption ? > yes, if you are looking at the back of
2006-03-10 by Jan-Ahrent Czmok
On 09.03.2006, at 04:59, c10h14no2i wrote: > I can answer two of your questions... > >> >> 2) >> >> How do i need to connect the POT ? Middle Pin goes to CV (right >> beside the PLS connector), left pin to jacket and right pin to >> Ground ? >> Info: Pot is 100Klin, so as all pot
2006-03-09 by keith sterling
> > From: "c10h14no2i" c10h14no2i@... > > > I can test the voltages for you tomorrow, if you still need them. I > dont have a keyboard hooked to the synth right now. > > Hey c10h14no2i, Could you still check voltages on your asr? Any 2 input voltages would do, like 0V and 5V. I n
2006-03-09 by Adam Schabtach
Greetings, I have a Bi-N-Tic PC board that needs a new home. Due to changing whims and interests I doubt that I'm going to use it. It is in like-new condition, as received from Ken. I'll throw in the paper copy of the Bi-N-Tic web page I ran off on my printer. I'll mail it within
2006-03-09 by c10h14no2i
I can answer two of your questions... > > 2) > > How do i need to connect the POT ? Middle Pin goes to CV (right > beside the PLS connector), left pin to jacket and right pin to Ground ? > Info: Pot is 100Klin, so as all pots are. the CV1 and CV2 inputs on the pcb are for the pro
2006-03-09 by Jan-Ahrent Czmok
Hi all, i got a bit further; it seems that the Problem with the "touching IC" can be isolated to the pin 2/3/4 and the pro SP trimpot. once i touched (!) the Pin 2/3/4 the VCO oscillates. i successfully got audio of SAW+/SAW and SINE, however haven't looked at the power neither o
2006-03-08 by sasami@hotkey.net.au
>I did check both resistors.. I even replaced them with what you have >specified in the schemo's. > >When I test using the AC output from the VCO, I get +5/-15 volts. >When I test w/ the DC output from the VCO the bottom of the wave >starts at about +10 volts, and goes up to wher
2006-03-08 by c10h14no2i
ok, so on the schematics the biasing resistors are the 240k to -, and the 330k between pins one and two of the 072. Elby instructions say to replace those w/ 270 and 560. I replaced the 240 w/ the 270 and the 330 w/ the 560. This is when I had the clipping problem. I decided mayb
2006-03-08 by c10h14no2i
YES That works perfectly. these analog circuits sure are tempermental. Why do different people get completely different results? Ive had a few modules now where I've had to change out components. 1/2 the people who helped me say "it should work fine as it is in the schematics" an
2006-03-08 by josh summitt
I've built two of these VCO's and on both of them i had to lower the gain so that the SAW would not hit the voltage rails. I changed the 330k resistor in the feedback loop of the tl072. Change it to a lower value. It should not take much like maybe a 250k or something. I can't re
2006-03-08 by c10h14no2i
I did check both resistors.. I even replaced them with what you have specified in the schemo's. When I test using the AC output from the VCO, I get +5/-15 volts. When I test w/ the DC output from the VCO the bottom of the wave starts at about +10 volts, and goes up to where I gue
2006-03-08 by sasami@hotkey.net.au
The 240k is the offset resistor. it sounds like the resistor you have in there is too small, perhaps not a 270k at all. Ken >Sorry for the basic question, but which are the offset resistors? The >ones around the tl072 that outputs to the saw out? > >If so, I should mention I am u
2006-03-08 by c10h14no2i
Also, On the scope, the square output is centered on 0, and the saw out is low. Its shifted down 1/2 way. So I guess if the square out is 10+/10-, the saw is 5+/15- > > > > Usually caused by the signal hitting a power rail and running out of > > anywhere to go. It's what i'd expe
2006-03-08 by c10h14no2i
Sorry for the basic question, but which are the offset resistors? The ones around the tl072 that outputs to the saw out? If so, I should mention I am using a 270k instead of the 240k, and a 560k instead of the 330k, which is what the elby instructions said to do. I think everythi
2006-03-08 by sasami@hotkey.net.au
Usually caused by the signal hitting a power rail and running out of anywhere to go. It's what i'd expect to find if an offset resistor was not soldered in propperly (or the wrong value), or some other voltage determining part. The name givven to this is "clipping". Ken >I got a
2006-03-08 by c10h14no2i
I got a working scope today, and the saw out of the VCO is very strange. Rather than /|/|/|/| it goes -\-\-\-\. That is the best I can do, but the 1st example should be a normal saw, and the 2nd example, whats going on is that it goes straight up, has a flat top, then slopes down
2006-03-07 by Richard Brewster
Although I built mine a little differently, you might want to have a look: http://www.pugix.com/cgs-vco.htm -Richard Brewster Jan Czmok wrote: >Hi all, > >i just successfully build the CGS48 and some questions appeared: > >- i hear the VCO only if i "touch" the TL072 on the lower
2006-03-07 by bbluthang
> > b) Tune pot/Fine Tune pot, both values 100K or 1M/100K ?? > > use 100K for tune and 1M for fine tune. > i should be more specific, if you use 100K/1M and the accompanying diode, you can enjoy a greater range on your tune pot - as Ken wrote - crank it down to LFO speeds. no di
2006-03-07 by bbluthang
hi > > - i hear the VCO only if i "touch" the TL072 on the lower left side, so > i assume the ground is somwhere missed or wrongly connected. i had this problem once on a VCO and found i hadn't soldered one pin on the chip - check your soldering? > > a) i know about the 0V/GND, G
2006-03-07 by Jan Czmok
Hi all, i just successfully build the CGS48 and some questions appeared: - i hear the VCO only if i "touch" the TL072 on the lower left side, so i assume the ground is somwhere missed or wrongly connected. a) i know about the 0V/GND, GND and VG, which one to use for the ground co
2006-03-07 by sasami@hotkey.net.au
The usual coures of action is for it to "follow" not "lead" a sequence or whatever. If running from a sequencer, it should grasp the previous note played and present it at the first output. In the perfect world, it would be able to predict the clockpulse and grab the sample just
2006-03-07 by sasami@hotkey.net.au
On the Cynare processor schematic, the resistor connected to pin 1 of op-amp "A" is incorrectly given as 33k. The PCB is correct, giving the value 33R. On the Matrix Mixer buffer board, one 100k input pulldown resistor is not connected to the corresponding input. Compare the trac
2006-03-06 by c10h14no2i
Is there a way to use it, the way I am trying to? Would I have to slightly delay the trigger pulse? Or is it simply not meant to be 'played' the way I was trying to use it? It doesn't really matter either way. I'm just exparamenting w/ what I can do with it. -Scott --- In cgs_syn
2006-03-06 by sasami@hotkey.net.au
As explained in the how it works section, the S&H of the ASR takes a while to settle. If you are presenting a clock signal and a new voltage at exactly the same moment, the voltage it will sample will be the previous voltage, perhaos shifted a bit. (while using in the normal way)
2006-03-06 by keith sterling
> > I can test the voltages for you tomorrow, if you still need them. I > dont have a keyboard hooked to the synth right now. > Thanks c10h14no2i, I would really appreciate it. If I can't get it to work in the next few days I am going to toss out this board and order another and
2006-03-06 by c10h14no2i
Today I hooked the ASR into my paia midi to cv, and put the 1v/o output into the asr's input. I patched the trigger out of the midi/cv to the clock input of the asr. The ASR doesn't always sample a new voltage when I press a key. The 2nd output still shifts to the 3rd, so it is g
2006-03-05 by c10h14no2i
I finished my asr today, and it works perfectly! It didn't at first, but the tl074 was bad.. I had a 084 on hand, so put it in its place. The bad 074 was getting warm. I can test the voltages for you tomorrow, if you still need them. I dont have a keyboard hooked to the synth rig
2006-03-04 by sasami@hotkey.net.au
1) I would not expect the TL074 to get warm. 2) if the extra trimming resistors in the buffers failed to change the gain, look elsewhere - like at what you are driving. 3) I can't check voltages because I sent my unit to some one else who buggered up theirs by using the wriogn ty
2006-03-04 by keith sterling
OK, all these resistors and caps all over the place, it's a mess. And still the same problems. The TL074 gets slightly warm to the touch. The scaling at the outputs is about a semitone short over 4 octaves and is influenced by the counter. I am assuming that others have succesful
2006-03-04 by djbrow54
--- In cgs_synth@yahoogroups.com , "c10h14no2i" wrote: >As mine is working now, inputting the extra SUB outputs back >into the filter make some cool sounds, but they definitely aren't >useable as a playable VCO. > As a VCO you will want to take the output of the CA3140 or the CD4
2006-03-03 by John Loffink
It is not the same part. The 74VHC4052 runs at 5 volts only. You need the CD4052 part that will run up to 15 volts. John Loffink The Microtonal Synthesis Web Site http://www.microtonal-synthesis.com The Wavemakers Synthesizer Web Site http://www.wavemakers-synth.com > -----Origin
2006-03-03 by c10h14no2i
Hello, Im building the ASR and forgot to order the 4052's. My local electronics store has the vhc4052's but not the standard ones. They say its the same part, but Ive run into problems w/ the HC ic's before. Is that going to cause any troubles? Thanks!
2006-03-03 by c10h14no2i
Ok!! I get it. I think I will build a little extra PCB for it, to use it as a standard VCO as well. or maybe do what Dave Brown did, and use your Gate Converter to use the sub outputs. Its so hard to find lm394's and tempco's these days, I want to get the most use of them as I ca
2006-03-02 by sasami@hotkey.net.au
Directly from the 4024, no. From the output of the filter if the 4024 has been fed back into it, yes, it is possible. I would suggest you have either a faulty 4024, or power rail issues around that chip, it it's actually coming directly out of that chip. Ken >I just tested the ou
2006-03-02 by sasami@hotkey.net.au
>Nevermind.... I had the damping up, so it sort of blended through the >gaps in the sound. It does the same thing w/ the configuration that >is laid out on the PCB. > >The outputs of the 4024 are fine by themselves. Its just after I run > them back into the filter input that they