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2007-04-04 by Scott Deyo
and the oscillator also clocks the switches that connect the bank of caps, which controls the frequency of the filter. so your filter is working, but you just can't change the frequency because the oscillator isn't working. i have one other customer with a kit with this problem,
2007-04-04 by timothy cooper
Well, the frequency controls control the frequency of the internal oscillator which is used to "excite" the signal. If you go to Mr. Deyo's website: www.bridechamber.com he has a schematic from electronotes posted that pumps up the oscillator signal to usable levels outside of th
2007-04-04 by casperelectronics
Hey Ryk, Thanks for the info. I wish I could help you with your networking issues :( I've done most of the things you suggested...I've made the transistor direction mistake a few times.. I know what you mean about the drawing. The first thing I have to try is testing the output o
2007-04-04 by Rykhaard D.A.M.I.A.N.
Take an oscilloscope probe or digital multimeter, and touch the output pin of the CA3140, to see whether you see the roughly 5 volt sawtooth or 5V AC signal (on the DMM). If you don't, your problem COULD possibly be the 2N jfet transistor not seated in the correct polarity. Thoug
2007-04-04 by Scott Deyo
Coincidentally, I have the exact same problem with a Bintic I built yesterday! I replaced the 4391 (worked many times before) and the 394 to no avail. Tonight I'll continue exploring. On my walk to my day job today I was obsessing about it (surprise!) and I've turned my eye on th
2007-04-04 by djbrow54
I would try to isolate it to the oscillator, the CV conditioning, or the clock/counter. I'd start by connecting pin 7 of the LM311 to an amplifier and see if you can hear the oscillator and if it varies with CV. When I built mine, for whatever reason, the pk-pk voltage on the out
2007-04-03 by casperelectronics
Hey scott, Here are all of the part substitutions. I think these should all work no prob. LF356 > TL071s, LM394>ssm2010 (Ray Wilson lists this as a good replacement for the LM394) 1Ktempco>standard 1K resistor 1N4148>1N914 input "beads">10ohm resistors I used a 2N4091 for my FET
2007-04-03 by Jan Czmok
Hi, sorry again for crossposting, as i am selling some frontpanels in favour of getting some for other modules. I am selling: - Blue aluminium Panel for Polyvoks VCF, asking 20 EUR / 30 USD Photos: http://www.flickr.com/photos/jczmok/378219088/ http://www.flickr.com/photos/jczmok
2007-04-03 by contact@bridechamber.com
Any component substitutions? 99% of the time it's a polarity, wiring or trace problem, at least with me :) Cheers, Scott ----- Original Message ----- From: casperelectronics To: cgs_synth@yahoogroups.com Sent: Tuesday, April 03, 2007 12:54 AM Subject: [cgs_synth] bi-n-tic filter.
2007-04-03 by casperelectronics
I just finished building the bi-n-tic filter and I don't seem to be getting any osc. output. The filter works great, bandwidth and damper do what they are supposed to do but the frequency controls don't do anything. Anyone have much experience with this circuit?
2007-03-31 by Future Image
Hi, The board is now finished, and I just ran a little PT-1 Casio keyboard (think Trio's Da Da Da) through it. It sounds great at the moment, but I just need to make John Loffink's cutoff knob adjustments. I can see what people mean about the noisy design too, but that's fine, I'
2007-03-30 by Andrew Scheidler
I made a short video of Aaron playing with my Gate Sequencer last weekend: http://youtube.com/watch?v=SzhVnYDC46g Someday I'll get around to recording something you can hear better :) Andrew Pete 23isgood@... > wrote: Nice panel. Do you have any audio samples? -- http://www.myspa
2007-03-28 by Future Image
Hi, I've almost finished my first module board, the Steiner VCF! I've got around 7 resistors to go and the front panel components. I think it will have taken me about 2 hours overall to get the finished board. Probably another hour to do my first front panel from aluminium and la
2007-03-28 by Future Image
Hi, I've almost finished my first module board, the Steiner VCF! I've got around 7 resistors to go and the front panel components. I think it will have taken me about 2 hours overall to get the finished board. Probably another hour to do my first front panel from aluminium and la
2007-03-28 by Future Image
MS80?!? Since when did Korg make that synth??? :S MS20/10/50 perhaps? --- In cgs_synth@yahoogroups.com , "richspirits418" wrote: > > --- In cgs_synth@yahoogroups.com , "gino wong" wrote: > > > > Hello, > > > > I will be crossposting this, so sorry if you see too much of this. > >
2007-03-28 by richspirits418
--- In cgs_synth@yahoogroups.com , "gino wong" wrote: > > Hello, > > I will be crossposting this, so sorry if you see too much of this. > > Is there anyone out there that would like to trade some enclosed 1/4" > jacks (switchcraft style, Peng type or real thing) for some C&K U33
2007-03-28 by sasami@hotkey.net.au
>I'm slightly puzzled by the CGS66 schematic. >Shouldn't the PSU outputs be on the output pins of the >regulators instead of the adjust pin? >The PCB seems to do just that. Yes, I've stuffed up the schematic. Thanks. >Also, the upper 10uF cap on the component layout >appears to m
2007-03-28 by Louis van Dompselaar
I'm slightly puzzled by the CGS66 schematic. Shouldn't the PSU outputs be on the output pins of the regulators instead of the adjust pin? The PCB seems to do just that. Also, the upper 10uF cap on the component layout appears to me to be the wrong way round. Louis
2007-03-25 by sasami@hotkey.net.au
>I have been wondering why no tube compressors use pentodes as VCA's >or why I have never heard of a tube gate. Although it might be >possible to design a tube VCA where the control voltage is inaudible >using a pentode with a different configuration or with a tube with >more tha
2007-03-25 by Mark
On 3/24/07, Richard Brewster put forth: >I find a very, very small output being passed when the Gain and CV pots >are at zero. I didn't try adjusting the trimpot, though, and this might >be why a small signal is passed. Initially I set the trimpot by ear. > >The CGS-65 really can
2007-03-25 by gino wong
Hello, I will be crossposting this, so sorry if you see too much of this. Is there anyone out there that would like to trade some enclosed 1/4" jacks (switchcraft style, Peng type or real thing) for some C&K U33 LYCQE. They are 3PDT on-off-on 1" bat handle toggle switches with 6
2007-03-24 by Richard Brewster
Here's the link to my demos again: http://www.pugix.com/bottom-cabinet-lower.htm#tubevca I find a very, very small output being passed when the Gain and CV pots are at zero. I didn't try adjusting the trimpot, though, and this might be why a small signal is passed. Initially I se
2007-03-24 by sasami@hotkey.net.au
>Firstly, while I've heard some very nice demos of its waveshaping >abilities, I am curious how well it performs as a VCA. If the input >signal is kept below the level at which it distorts, how well does it >function as a VCA?? How well does it mute an incoming signal if no >enve
2007-03-24 by Doug Wellington
Check out Eagle. There is a free version you can use to lay out two layer 80x100 mm boards. The free version can also be used as a reader for layouts created with the more expensive versions... http://www.cadsoftusa.com Doug http://www.analognotes.com http://www.stoogepanels.com
2007-03-24 by Mark
I basically have two questions about the CGS65. Firstly, while I've heard some very nice demos of its waveshaping abilities, I am curious how well it performs as a VCA. If the input signal is kept below the level at which it distorts, how well does it function as a VCA?? How well
2007-03-24 by Dave Kendall
Try Osmond PCB http://www.swcp.com/~jchavez/osmond.html The basic version is free, if you register and pay then you can make bigger boards and I guess get all sorts of other stuff. I used to use the old maC OS9 version which was a bit buggy. The new mac OS X version seems great -
2007-03-24 by kidkrazy58
I only use mac so its a pian sometime for stuff other then audio
2007-03-23 by Pete
Here you go. I use it myself for home made pcb's, http://www.expresspcb.com/ExpressPCBHtm/Download.htm -- http://www.myspace.com/23isgood [Non-text portions of this message have been removed]
2007-03-22 by Andrew
Is there a free program somewhere that can be used for *very simple* PCB layouts? thanks :) Andrew ps- AHMW this weekend! http://www.ph.k12.in.us/~drew/ahmw http://youtube.com/ahmwsynth
2007-03-22 by sasami@hotkey.net.au
Your 0 volt line is your "ground" connection for the circuitry. Ken >Hi all, > >I'm building the smaller Stomp Box Adapter and had a pretty newbie- >ish question: > >The To/From E connection points.... I was going to run them right >into my patch bay, but where would the ground c
2007-03-22 by Matthew Hiscock
Hi all, I'm building the smaller Stomp Box Adapter and had a pretty newbie- ish question: The To/From E connection points.... I was going to run them right into my patch bay, but where would the ground come from? Should I just run a wire from the ground post of the power supply c
2007-03-22 by stuadh
Many thanks. Stuadh --- In cgs_synth@yahoogroups.com , sasami@... wrote: > > You can leave the parts out. > > Ken > > >Hi, > > > > I'm almost ready to start putting my sequencer together (after I've > >moved house) and I have a quick question; I don't want the CPO or the > >AEP o
2007-03-22 by sasami@hotkey.net.au
You can leave the parts out. Ken >Hi, > > I'm almost ready to start putting my sequencer together (after I've >moved house) and I have a quick question; I don't want the CPO or the >AEP outputs. Looking at the schematic, these to nodes seem to be self >contained after they leave
2007-03-21 by stuadh
Hi, I'm almost ready to start putting my sequencer together (after I've moved house) and I have a quick question; I don't want the CPO or the AEP outputs. Looking at the schematic, these to nodes seem to be self contained after they leave the A, B and D lines. Can I simply not po
2007-03-21 by sasami@hotkey.net.au
>On building the '52, Where do the 2x 10n caps go?? I see there is 10n on the solder side, but >no holes? hmm.. You solder them on the back of the board where those pads with no holes are. It is not an error. >Also, What is the difference between transistors 2N3906 and 2N3904? PN
2007-03-21 by Mickey Finn
Cheers- First Post- On building the '52, Where do the 2x 10n caps go?? I see there is 10n on the solder side, but no holes? hmm.. Also, What is the difference between transistors 2N3906 and 2N3904? I found that they both reference this single NTE transistor by mouser.. http://www
2007-03-20 by kidkrazy58
Yeah see thats what i had figured but then he labled each one vlalve one and valve two, it just threw me off. like maybe its for stability issues or ome kinda capasitiance thats tryig to be avoided or something of the sort. I guess if you and most people think its just one tube i
2007-03-19 by laxt57@aol.com
Hi I may be confused, but I think it is only one tube, it is only drawn as if there were two separate triodes. This is typical convention with valve(tube) schematics.Jeri -----Original Message----- From: andrewxx58@... To: cgs_synth@yahoogroups.com Sent: Mon, 19 Mar 2007 6:22 AM
2007-03-19 by kidkrazy58
I was wondering about the neon lamp vco on www.uni-born.de the synth r us site. In the schematic youll notice it has two 12ax7 tubes. BUt i know that the 12ax7 is a twin tube so is there any reason that it has to have two seperate tubes? Im not sure if ken has this vco on his sit
2007-03-18 by Richard Brewster
http://www.pugix.com/bottom-cabinet-lower.htm#tubevca -Richard Brewster
2007-03-18 by stiebz
Thanks for all your help the problem of the overheating resistor is solved. it was indeed a short to the ground. still only lfo 3 &4 working properly... the wiring from the pcb to switches, potmeters & leds seem to be OK, because when I switch the wiring from lfo 3 to 2, then the
2007-03-18 by Richard Brewster
http://www.pugix.com/wogglebug.htm Gives an idea of what this exotic random voltage generator does. Credit goes to Grant Richter for inventing it! I'm posting this here because it is an extreme DIY project. All the information you need to build one is given on my website. But the
2007-03-16 by Richard Brewster
It's always a good idea to check the resistance between +15 and ground and -15 and ground on the PC board before connecting up power to a new module. You should see above 10K resistance on most modules. If it is under 1K, something is probably shorted or misconnected. -Richard Br
2007-03-16 by sasami@hotkey.net.au
Component recognition problems. I very much doubt a 100n could get hot on its own. Either something is heating it via radiation/conduction (i.e heated BY the 10R), or alternately, it isn't a capacitor at all, which would explain the 10 ohm resistor going up in smoke. Is anything
2007-03-16 by bbluthang
it sounds like you have +15V shorting to ground somewhere -check wiring and soldering. i've fried a few 10R resistors - its a nice safety net to have them --- In cgs_synth@yahoogroups.com , "stiebz" wrote: > > When test running my newly build super psycho lfo, I found only lfo 3
2007-03-16 by stiebz
When test running my newly build super psycho lfo, I found only lfo 3 & 4 working. But what worried me more was the R10 resistor in the power filter that burned.It was the one on the +15V side of the circuit.Also the 100n capacitors surrounding the resistor got really hot. As far
2007-03-16 by kidkrazy58
OH for real so awsome im gonna join it i hope i dont have to wait to get approved but im guessing so thanx abunch --- In cgs_synth@yahoogroups.com , "bbluthang" wrote: > > I set up a Yahoo group for storing and sharing tube schematics (for > synths) last year. > if you are keen o
2007-03-15 by ryan williams
wow thanks. that will keep me busy for a while. On 3/14/07, Ben Stuyts ben@... > wrote: > Hi Ryan, > > On 14 Mar 2007, at 20:26, ryan williams wrote: > > > anyone know of any books or deccent web sites on tube circuit > > design? i want > > to see all the math and models and what
2007-03-15 by bbluthang
I set up a Yahoo group for storing and sharing tube schematics (for synths) last year. if you are keen on building or dreaming about building a tube synth, please join - http://launch.groups.yahoo.com/group/tubesynthdiy/ There is already plenty in the files section to get you sta
2007-03-14 by Ben Stuyts
Hi Ryan, On 14 Mar 2007, at 20:26, ryan williams wrote: > anyone know of any books or deccent web sites on tube circuit > design? i want > to see all the math and models and what not. I have a little bit > from a text > book written in the 60s but its not great. I found this site