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2004-10-31 by stuadh
Hooray! This was a definite case of RTFQ...Read The F***ing Question. I had put in 2 x 2N3906 transistors, rather than a 2N3904. I've replaced one with an alternative (BC547) and things are much better. The signal still tails out as I turn the pot down, but checking the outputs f
2004-10-31 by sasami@hotkey.net.au
Hmmm... There are likely to be two problem areas- 1) construction 2) interface. 1) you seem think you have this sorted. In fact, it is very unlikely that any components were damaged at any stage, short of doing something catastrophic like reversing the power supply. There may how
2004-10-31 by stuadh
No discernible change. (Very prompt again, thanks) Stuadh --- In cgs_synth@yahoogroups.com , sasami@h... wrote: > Something is amiss. First, try putting a 100n capacitor in series with the > input. This will get rid of any DC offset that may be upsetting it. > > If that fails, re
2004-10-31 by sasami@hotkey.net.au
Something is amiss. First, try putting a 100n capacitor in series with the input. This will get rid of any DC offset that may be upsetting it. If that fails, report back :) Ken > > >I've just completed my first GCS module, hurray. I'm not sure if it >works, though. It is the simp
2004-10-31 by stuadh
I've just completed my first GCS module, hurray. I'm not sure if it works, though. It is the simple wavefolder. Thing is, should there be large parts of the range that are silent. When you turn the Pot to give the lowest resistance to the incoming signal, there is some output, bu
2004-10-30 by sasami@hotkey.net.au
Any small fast FET. Look up what people have used for the ASM-1 VCO or even other VCOs. I have used MPF102. Ken > > >Hi again, > > almost finished populating the VCO, but I can't find the 2N4856 >anywhere, even given the recent thread. Can anyone suggest an >alternative, or a sou
2004-10-30 by Scott E.
Hi Ken, Nice to se a utility LFO in your line up. One comment for web site: on the pcb/index.html page, the Runout boards are listed in gray, but the color is so close to the black, that I can't distinguish the difference (at least with my older eyes). Scott =====================
2004-10-30 by stuadh
Hi again, almost finished populating the VCO, but I can't find the 2N4856 anywhere, even given the recent thread. Can anyone suggest an alternative, or a source (UK prefered). Many Thanks Stuadh
2004-10-30 by sasami@hotkey.net.au
All you people who have been asking for an LFO, well here it is. http://www.cgs.synth.net/modules/cgs58_lfo.html Ken _______________________________________________________________________ Ken Stone sasami@... or sasami@... Modular Synth PCBs for sale http://www.blaze.net.au/~sas
2004-10-29 by sasami@hotkey.net.au
>In the Bandpass filter, what is the "CX" component at the OUT >point? Nothing. If you look on the other side of the PCB, you will find the terminals of that area are shorted together. It is there as an option for more advanced builders should they need to make the output AC coup
2004-10-29 by stuadh
In the Bandpass filter, what is the "CX" component at the OUT point? Stuadh --- In cgs_synth@yahoogroups.com , "bbluthang" wrote: > > Hi Stuadh > the sleeves of the sockets all need to be linked and then run a wire > back to the 0V. > with the pot, if you are looking at it from b
2004-10-28 by bbluthang
Hi Stuadh the sleeves of the sockets all need to be linked and then run a wire back to the 0V. with the pot, if you are looking at it from behind (shaft pointing away from you), the tab on the left also needs to be linked to the 0V chain. the center tab goes to the 'in' hole. the
2004-10-28 by stuadh
Hi list, I'm building my first real module, the CGS52 simple wavefolder. I'm working on the inputs and outputs and I've notices that there is only space for one 0V lead. Am I correct in assuming that you do not need to wire the sleeve of the 3.5mm sockets (In, Out (S) and Out (T)
2004-10-27 by stuadh
Thanks Ken and everyone else who answered. That explains it quite sufficiently. I was interested in fairly accurate tracking as I'm interested in using the formants to "vocalise" the synth sound, kind of like a poor mans vocoder. However, you've convinced me not to bother...well,
2004-10-27 by sasami@hotkey.net.au
>On the partslist on the page > http://cgs.synth.net/modules/cgs48_vco.html >it lists the LM3900 QTY as 3 but I only see 1 used in the circuit. No it doesn't! (as of 1 minute ago anyway. thanks for the heads-up) Ken ________________________________________________________________
2004-10-27 by sasami@hotkey.net.au
The usual trick is to use OTAs instead of the op-amps to vary the frequency, and as OTAs don't use the same physical or electrical configuration, it would get ugly. Now if you are simply wanting to do the triple resonant filter and don't care about accurate tracking, some possibi
2004-10-26 by Michael
On the partslist on the page http://cgs.synth.net/modules/cgs48_vco.html it lists the LM3900 QTY as 3 but I only see 1 used in the circuit. - Michael nil-x - Pressure : Penetration
2004-10-26 by Larry Hendry
If parts lists are made, I am happy to provide a posting spot if one does not have a place of their own. Lary --- Michael nil@... > wrote: I can make one but it would have been a lot easier if someone had already ordered parts for the VCO in the US and made a list. Michael nil-x
2004-10-26 by Richard Brewster
Could it have come from here: http://www.synthtech.com/motm410.html Cynthia also sells this in Modcan format: http://www.cyndustries.com/modules_triprez.cfm -Richard Brewster Ryan Williams wrote: >why not built the tripple resonant filter from korg ps3100. I expect >that is where
2004-10-26 by Ryan Williams
why not built the tripple resonant filter from korg ps3100. I expect that is where the doepfer one came from? lots of people build this circuit, I plan to do so as soon as I finish some other things. Listen to samples on scott stites page or the synthtech page to hear it. that on
2004-10-26 by stuadh
Yep, they're definately terms that a newbie can understand... I got the idea after looking at the Doepfer A127 triple resonant filter. I'm not interested in the in-built LFOs, but I like the idea of being able to VC the freqs (talking synths). Is there a technical reason why the
2004-10-26 by Don't t(h)read on my tentacles, Earthlin
Le 26 oct. 2004, à 19:38, Michael a écrit : > > Yes I checked Bob's and Larry's sites already - didn't see a list for > the VCO Seems the sites has some problems anyhow :-/ unfortunately. Denis =G)
2004-10-26 by sasami@hotkey.net.au
I'd suggest building a different sort of filter if you want voltage control. It's kind of like asking how to add wheels to your motorbike because you want a car. Ken >Hi list, > > I'm about to start building a 3 x band Pass filter + DC mixer as >shown on the website. > > However,
2004-10-26 by stuadh
Hi list, I'm about to start building a 3 x band Pass filter + DC mixer as shown on the website. However, can anyone explain (in terms that a newbie might understand) how to add voltage control to the frequency of the BP filter. I'd like each channel to have this in addition to th
2004-10-26 by Michael
Yes I checked Bob's and Larry's sites already - didn't see a list for the VCO - not a big deal as I can make one but it would have been a lot easier if someone had already ordered parts for the VCO in the US and made a list. - Michael nil-x - Pressure : Penetration --- In cgs_syn
2004-10-26 by Larry Hendry
All I have are the links to the Bob Knarley pages. None of my klinks include the VCO. Larry --- Yves Usson yves.usson@... > wrote: > > I think that Bob Knarley and Larry Hendry have some of these : > check these URL : > http://www.bobknarley.com/ > > (I have just checked but righ
2004-10-26 by Yves Usson
I think that Bob Knarley and Larry Hendry have some of these : check these URL : http://www.bobknarley.com/ (I have just checked but right it seems to have problems, a lot of pages are temporarily unavailable) and : http://www.wiseguysynth.com/larry/default.htm http://www.wiseguy
2004-10-25 by Michael
Has anybody put together a US Partslist for the CGS that they can share? I would be much appreciated. thanks, - Michael nil-x - Pressure : Penetration
2004-10-25 by ilanode
Hi Anddrew, *many thanks*! Well, my learning curve on electronics isn't steep. Actually I'm progressing slowly. An Analog Logic is done and the Burst Gen will be done. Regards, Ilanode --- In cgs_synth@yahoogroups.com , "bbluthang" wrote: > > hi > > On the pcb of Burst Gen there
2004-10-24 by bbluthang
hi > On the pcb of Burst Gen there is a pad CLK O is that a clock output? the Clk O connects to the 'switch' on the clock-in jack. if nothing is plugged into this jack, you can set the burst gen up with the speed pot and range switch. once you plug in, this part of the circuit is
2004-10-24 by ilanode
Hi list, I'm peeping here for a while and this is my first posting. I've no EE or whatsoever background so my querry might be dumb. I'm shopping for parts and wonder if I could replace the VOLT value of electrolytic caps by any other value as long as it is higher than the PSU use
2004-10-14 by sasami@hotkey.net.au
That's the beast. Ken > >on 10/14/04 12:06 PM, david wright at bastardita@... wrote: > >> >> hey jay >> heres a link to the company i got my tempcos from >> hope it helps out >> >> http://www.precisionresistor.com/total.pdf > >Im assuming part #PT146? > > > > >See the following U
2004-10-14 by Jay
on 10/14/04 12:06 PM, david wright at bastardita@... wrote: > > hey jay > heres a link to the company i got my tempcos from > hope it helps out > > http://www.precisionresistor.com/total.pdf Im assuming part #PT146?
2004-10-14 by david wright
hey jay heres a link to the company i got my tempcos from hope it helps out http://www.precisionresistor.com/total.pdf ----- Original Message ----- From: Jay To: cgs_synth@yahoogroups.com Sent: Tuesday, October 12, 2004 6:39 PM Subject: Re: [cgs_synth] Re: CGS VCO questions on 10
2004-10-13 by Ryan Williams
Jay wrote: > on 10/12/04 10:34 PM, Richard Brewster at pugix@... wrote: > > > Temperature stability isn't that big of a concern for me. > > Can the tempco be left out entirely then? if you don't care about temp stability, put in a normal resistor instead. -ryan
2004-10-13 by Jay
on 10/12/04 10:34 PM, Richard Brewster at pugix@... wrote: > Temperature stability isn't that big of a concern for me. Can the tempco be left out entirely then?
2004-10-13 by Jay
on 10/13/04 2:31 AM, Scott Stites at scottnoanh@... wrote: > > Jay - > For the 2SC1583, Electronix Plus (the place with the cheap switches, if you > recall) has them for $0.79 apiece. > > http://www.electronix.com/catalog/advanced_search_result.php?keywords=2SC158 > 3 Ah, yes!
2004-10-13 by Ryan Williams
yea, I bought 100 of the last 120 2sc1583 from american microsemi. mouser lists a NTE part as substitute. it's like $2 though and I wonder if it's really a suitable replacement for our purposes. ryan Scott Stites wrote: > American Microsemi for the *longest* time had them for $0.
2004-10-13 by Scott Stites
Jay - For the 2SC1583, Electronix Plus (the place with the cheap switches, if you recall) has them for $0.79 apiece. http://www.electronix.com/catalog/advanced_search_result.php?keywords=2SC158 3 I'm pretty sure that MCM In One has them, and a place called Suburban Electronics (I
2004-10-13 by sasami@hotkey.net.au
>If you use this 1K 3500ppm TEMPCO resistor, you will NOT want to add the >62 ohm resistor in series. I found that with a 56K 1% resistor, as in >Ken's schematic, and the 100K 1% resistor in series with the SPAN >trimmer, it was not possible to tune to 1V/octave (span trimmer all
2004-10-13 by Richard Brewster
I built two CGS VCOs this year, and purchased kits with the special parts for the ASM-1 VCO here. http://www.elby-designs.com/shopping/enter.html The `special components’ kit for the ASM-2 contains the following harder-to-get components:- 1. 2 off MAT-02 2. 3 off J108 transistors
2004-10-13 by groovyshaman@snet.net
Well it appears LM394's can be had all over. digikey.com arrow.com future-active.com And MAT-02 you can find at arrow.com. Don't know about the 2SC1583. George ----- Original Message ----- From: "Jay" jay@... > To: cgs_synth@yahoogroups.com > Sent: Tuesday, October 12, 2004 9:26
2004-10-13 by Jay
on 10/12/04 9:24 PM, david wright at bastardita@... wrote: > i used big tempcos > from that florida company. i forget their name. got a stock pile ready as well > ;) Have the part # handy? I live 20 minutes away from them...
2004-10-13 by Jay
on 10/12/04 9:12 PM, bbluthang at jumpswine@... wrote: > the first one has a LM394. > the 2nd got a 2SC1583 (the shop selling 394's went belly-up, 1583's > are starting to dry up too) > it works fine, but i'd like to find some more LM394 or MAT-02 for the > next two. > The tempco
2004-10-13 by david wright
hey there - analog devices sells the MAT-02 - its just alil expensive and you have to have it shiped from the orient. but they work very well. i have about 40 1583s just waiting for the next apocolypse ;) - i used big tempcos from that florida company. i forget their name. got a
2004-10-13 by bbluthang
hi Dave > ps- what did you use for your exponential converters? the first one has a LM394. the 2nd got a 2SC1583 (the shop selling 394's went belly-up, 1583's are starting to dry up too) it works fine, but i'd like to find some more LM394 or MAT-02 for the next two. The tempcos w
2004-10-12 by david wright
hey andrew thanks for the kind words. i have my vco w/ EVERYTHING except the suboscilator. i really enjoy the waveshape cv. i'm debating taking out one of the cv processor pots and adding the suboscilator. but might not. i am allmost finished with my second VCO - and i will let y
2004-10-12 by bbluthang
hi Dave i've made two CGS VCOs. the first was built with all the fruit. from memory(?) i ran a wire from the switch of the SQ out jack to the 'staircase in' jacks's switch - saved me using one patch-cord. the 2nd was built into an already crowded panel, so had space limitations.
2004-10-10 by ask
hello folks - recently made a CGS VCO w/ everything except the suboscilator outputs. It's really a great VCO, the CV proccessors are extreamly handy, stayed in tune over night to the note of C, so thats pretty good. I used a MAT-02/tempco/heatsink/tie for expo converter. now - i'
2004-10-04 by adaaxs
Is there anyone in this group in the Philadelphia (usa) metro area that may want to exchange parts resources etc... gino wong