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2006-03-02 by sasami@hotkey.net.au
Perhaps a VCA connected after the filter using the same CV as the pitch could be used to correct the output level? Ken >Ummm.. maybe I should have mentioned I made the mod that is in the >file section.. posted by Dave Brown. I have removed the mod and built >the circuit as it sho
2006-03-02 by c10h14no2i
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 do the
2006-03-02 by c10h14no2i
Ummm.. maybe I should have mentioned I made the mod that is in the file section.. posted by Dave Brown. I have removed the mod and built the circuit as it should be, and the sub osc seems to work the way it should. The oscillations do stop at lower frequencies, but the filter doe
2006-03-02 by c10h14no2i
I just tested the output of the ca3140, and it sounds fine at all frequencies.. just like the VCO. I guess the issue, if there is one, is w/ the 4024. Its divided outputs definitely aren't lower frequencies. It just puts little gaps in the sound relative to the frequency it is ge
2006-03-02 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. > >
2006-03-02 by sasami@hotkey.net.au
If you are referring the the outputs of the 4024, I would expect them to remain constant, as per the CGS01. It is entirely possible I have made an error in that VCO layout. I made another project after this one using a modified artwork and that one does indeed have issues. One's
2006-03-02 by Pete
mine does that too. On 3/1/06, c10h14no2i c10h14no2i@... > wrote: > > W/ mine, its not just the very high freq's, but everything above > maybe... c4. I'll have to do some better tests tomorrow. Im just > feeding it a voltage right now, and comparing it to a standard VCO. > > Anot
2006-03-02 by c10h14no2i
W/ mine, its not just the very high freq's, but everything above maybe... c4. I'll have to do some better tests tomorrow. Im just feeding it a voltage right now, and comparing it to a standard VCO. Another thing I have noticed is that the SUB channels don't act the way the sub os
2006-03-02 by Pete
After using this Filter for a while now I have come to the conclusion that this is really a VCO with crazy FM options. I do understand what you mean about the high frequencies, but I think its just reaching its last octave at this point and it may be a normal response to become q
2006-03-02 by c10h14no2i
Ive been having great fun w/ the bi-n-tic filter, but have one issue when using it as a VCO. The higher frequencies are very quiet. I know this is a filter, so if thats just the way it is, then thats fine. If it should operate w/ a roughly uniform volume at the entire audio range
2006-03-02 by c10h14no2i
Dont give up yet. The only time Ive given up and de and resoldered everything, I wound up w/ many more problems than I originally had. The voltages Ken posted are great! I wish I had something like that for everything Ive ever had trouble w/. --- In cgs_synth@yahoogroups.com , Ja
2006-03-02 by sasami@hotkey.net.au
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. Ken > >On 02.03.2006, at 03:25, c10h14no2i wrote: > >> I was sti
2006-03-02 by Jan-Ahrent Czmok
On 02.03.2006, at 03:25, c10h14no2i wrote: > I was still able to see(hear) a very low signal after the input > resistors. Then nothing after the one w/ the bad land. addtion: i found one 10nF which should be 100nF and replaced and found one bad lead. But now it's completely silen
2006-03-02 by sasami@hotkey.net.au
Cut the power rails to the TL074. Add 100 ohm in series between the power rails and the power pins. Add decoupling capacitors between the power pins and earth, and each other. Use 100n AND low ESR electros. >I've been staring at this asr for a few days now and I can't figure out
2006-03-02 by Jan-Ahrent Czmok
On 02.03.2006, at 03:25, c10h14no2i wrote: > I was still able to see(hear) a very low signal after the input > resistors. Then nothing after the one w/ the bad land. > Well. i changed the TL071CN - nothing changes. I resoldered everything. All values of the Resistors + Capacitors
2006-03-02 by c10h14no2i
I was still able to see(hear) a very low signal after the input resistors. Then nothing after the one w/ the bad land. > a) I see the CV and FREQ IN at the "entry point" to the PCB, behind > the 220K (nearby the CV input's) i just see _nothing_ at all, no wave > or power behind >
2006-03-01 by Jan-Ahrent Czmok
On 02.03.2006, at 00:38, c10h14no2i wrote: > I'm NO expert, but the first things I'd try is to be sure your power > wires are all good. Test the voltage somewhere on the PCB where you > know it should be getting +15 and -15. Then I'd replace the tl071. > On mine, I had a few bad
2006-03-01 by keith sterling
I've been staring at this asr for a few days now and I can't figure out its problem. I get very small (on the order of millivolts) fluctuations in all outputs relative to the counter state. I replaced the 10uF caps with 100uF. Power supply is ample and stable. Resistors are all h
2006-03-01 by c10h14no2i
I'm NO expert, but the first things I'd try is to be sure your power wires are all good. Test the voltage somewhere on the PCB where you know it should be getting +15 and -15. Then I'd replace the tl071. On mine, I had a few bad solder lands on the PCB. I built a bunch of CGS mod
2006-03-01 by janczmok
Hi all, i finally was able to finish the Synthacon VCF but it's not working as expected. CV input does not react at any input feed. Lowpass and Highpass are only passing 5% of the original value Bandpass seem to work correctly. The Resonance does not work at all, neither the freq
2006-02-26 by peng3002
--- In cgs_synth@yahoogroups.com , "c10h14no2i" wrote: > Although, the samples I > have heard have reverb and other effects on them as well.. (why do > people add other effects when they are trying to give an example of > what a module does?!) I'll second that!!!!!!!!! > > Oh, th
2006-02-26 by peng3002
--- In cgs_synth@yahoogroups.com , Dave Kendall wrote: > Would it be a solution to *seriously* limit the voltage to them, making them > much dimmer? > Might that also have the benefit of drawing less current? > > cheers, > > Dave > Yes. I think so. I use blue and other ultrabrigh
2006-02-26 by Gerald Stevens
The backlash against blue LED's is pretty wide-spread. They're slick looking and scream "modern", since they've only been available for a few years, so manufacturers put them in everything these days. Keep them dim, and they're not too painful to look at - my Virus Indigo has nev
2006-02-26 by Dave Kendall
Thanks for the replies guys. Seems pretty clear what the consensus is...... Would it be a solution to *seriously* limit the voltage to them, making them much dimmer? Might that also have the benefit of drawing less current? cheers, Dave
2006-02-26 by c10h14no2i
I totally agree about those blue led's! I used to DJ at a club here, and they got a new DJ mixer w/ a bright blue led on it. It was horrible! In a totally dark club, its hard enough to see the tracks on the records, but then after staring at a bright blue LED, it was nearly impos
2006-02-26 by sasami@hotkey.net.au
Last time I used a superbright blue LED, I wired 22k or 33k in series with it to make it more appropriate. That's right 22 or 33 thousand ohms. The good thing in this is it won't be spiking the PSU when it switches on and off. Ken >On 2006-02-25 18:59 -0800, keith sterling wrote:
2006-02-26 by Bob
Speaking of the SUB OSC has anyone considerd adding this DB-120 Daughterboard to the CGS Sub Osc, acually you could add one per channel. Here is a link to the board. http://www.tellun.com/motm/diy/db120/DB-120.html any thoughts? Bob --- In cgs_synth@yahoogroups.com , "c10h14no2i"
2006-02-26 by Andre Majorel
On 2006-02-25 18:59 -0800, keith sterling wrote: > > I've got some nice blue ultrabright LEDs, > > Not to spoil your fun, but I used blue super bright LEDS on a > project.... and hated the look. Unlike the other ultra brights I > used, (white, purple, green) the blue ones always
2006-02-26 by keith sterling
> > I've got some nice blue ultrabright LEDs, Not to spoil your fun, but I used blue super bright LEDS on a project.... and hated the look. Unlike the other ultra brights I used, (white, purple, green) the blue ones always distracted me, even from across the room. Plus they were
2006-02-25 by c10h14no2i
Hey, Finished the Wave Multiplier today, and it sounds great! However, I dont think the grinder is working. The further cw I turn the pots, the quieter the output gets. The most it ever does to the sound, other than making it quiet, is that it gets kind of thin and sharp (clicky
2006-02-25 by hitchindave
Hi all. Hope this is an easy one.... :-) I've got some nice blue ultrabright LEDs, with a max voltage handling of 4V. (most efficient at 3.6V according to the seller....) I guess I'd need to mod the output buffers of the "gate" 4051 to accomodate them. Is it as simple as changing
2006-02-25 by sasami@hotkey.net.au
>It was the IC. good to know you've solved it. Ken > > >> --- In cgs_synth@yahoogroups.com , "c10h14no2i" wrote: >> > >> > Hello >> > Ive completed the sub osc, and everything seems to work fine except >> > for the prescaller. As soon as I enable it, I loose audio on the B >> > c
2006-02-24 by c10h14no2i
It was the IC. > --- In cgs_synth@yahoogroups.com , "c10h14no2i" wrote: > > > > Hello > > Ive completed the sub osc, and everything seems to work fine except > > for the prescaller. As soon as I enable it, I loose audio on the B > > channel. As usual, Ive checked the obvious (sol
2006-02-23 by John Loffink
Pot Chiclets are an aid for the assembly of MOTM kits, DIY kits and module conversions using Spectrol pots, or almost any synthesizer project that uses free standing pots with 0.1 inch spaced PCB leads. Instead of painstaking J lead preparation, pots are mounted to the Pot Chicle
2006-02-21 by c10h14no2i
I know the switch could be a source of trouble, so I have removed the rotary switch, and hard wired A to C and /3 to com. It does not work. Im not exactly clear on how the 4017 works, but from what i can tell, if everything else is working, the 4017 must be the problem. Let me kn
2006-02-21 by c10h14no2i
Hello Ive completed the sub osc, and everything seems to work fine except for the prescaller. As soon as I enable it, I loose audio on the B channel. As usual, Ive checked the obvious (solder, polarity, etc). I dont have another 4017 to try right now, but will order one if you th
2006-02-20 by sasami@hotkey.net.au
Sounds like power-rail fluctuations. Try adding 100uF caps between +15 and 0 and -15 and 0. If that helps, start thinking about upgrading your PSU. Ken >Hi All, > >I just finished my analog shift register and it seems that the outputs >are modulated by the counter state. The asr
2006-02-19 by keith sterling
Hi All, I just finished my analog shift register and it seems that the outputs are modulated by the counter state. The asr is working but each output fluctuates by about 10mV depending on the 4024's outputs. I think it's due to something other than be due to mismatching of the ou
2006-02-17 by sasami@hotkey.net.au
>ok, but if I... > >>put a single gang pot in series with one of the 100k stages (one will be backwards from what you want), or use two separate 100k pots instead. > >this'll give a 'true' bandwidth function ? It should. I haven't tried it, but essentially a band pass filter is a
2006-02-17 by Charles Stella
Ok so I got my TI 40106's. Still not working correctly. The clock follows the trigger in on the output. Rate works etc. But no bursts. If I toggle the rotary switch between positions I occasionally here a quick burst. Any help would be greatly appreciated. Thanks, Charles. On Feb
2006-02-17 by Al
Hi Ken Thanks for the prompt reply, one or two points that I'm a bit vague on still, perhaps you can confirm I understand your comments correct. >Simply a case of swapping the outer wires. It was not a true bandwidth function, instead just labelled so due to the apparent change o
2006-02-17 by sasami@hotkey.net.au
>The notes on Ken's site mention that the Rev1 cct had the resonance >pot wired for 'bandwidth' and the Rev2 is altered to give resonance >adjustment. I'd like to try wiring a board with the pot for >bandwidth. Is this a question of swapping over the links on the board >to the po
2006-02-17 by Charles Stella
Hi. Thanks for the response. No I am running it only a +15V. the -15 pad from the power connector is not connected. I traced the problem to a bad transistor on the End out. No everything is fine voltage wise and no more smoke and craters : although that was kinda fun :) Now I thi
2006-02-16 by sasami@hotkey.net.au
You aren't running it on +/-15 isnstead of +15/0V are you? You have a serious over-voltage problem if craters are appearing. Ken >Hi. I am trying to get my first Burst Gen going and running into some problems. When I have >have all the chips in the 4017 gets really hot and twice
2006-02-16 by cstella4
Hi. I am trying to get my first Burst Gen going and running into some problems. When I have have all the chips in the 4017 gets really hot and twice blew a crator in the chip! I have checked the active parts Diodes , Transistors and they are fine. I have soketed all the chips and
2006-02-15 by c10h14no2i
YES! thats it.. so would the correct solution be to wire a pot to +v & ground w/ wiper to pwm? I was wondering how to get an 'initial pulse width' pot in there, and I guess thats it. --- In cgs_synth@yahoogroups.com , sasami@... wrote: > > Apply a voltage into the PWM input. If t
2006-02-15 by Al
Hi there, New to the forum and taking my first steps cascading some of the cgs30 filters (the PCBs are pristine btw). A few questions, hopefully you can put me on the right tracks. Hope it's not too much to swallow in one post, but here goes The notes on Ken's site mention that t
2006-02-15 by sasami@hotkey.net.au
Apply a voltage into the PWM input. If the triangle wave isn't happening within the comparator's range, there will be no output. Ken >The triangle out is working, but square out is not. There isn't much >to what converts the triangle to square, so I thought I could figure >it out
2006-02-15 by sasami@hotkey.net.au
> >there were three on this board. One was missing. One fell off as >soon as I started to solder it. Then the third I just found today. This is usually because the pad got too hot when soldering. THe copper foil is only glued on, and if you apply too much heat, they let go and ca
2006-02-15 by c10h14no2i
The triangle out is working, but square out is not. There isn't much to what converts the triangle to square, so I thought I could figure it out. While looking around for bad solders or anything else I had my headphones plugged into the square out. I started to get a tone.. defin