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2004-12-03 by sasami@hotkey.net.au
> > >hi all, >I want to add a volume control to each of the osc on the super psy >lfo. >What is the best place to add a pot on the mix bus, before or after >the 470K res? Can I add a 100k pot before the 470k res and be done? >Are their affects on the mixer op-amp... Before the 47
2004-12-03 by Larry Hendry
If you want to blow your mind. Run 3 audio signals into it. 1 in the normal spot 1 in the fold CV 1 in the offset CV Now, turn knobs and try not to scream. Larry H (I LOVE this circuit) --- Michael wrote: > I completed the Wave Multiplier project last night, the thing is > pretty
2004-12-02 by Jeff Foster
hi all, I want to add a volume control to each of the osc on the super psy lfo. What is the best place to add a pot on the mix bus, before or after the 470K res? Can I add a 100k pot before the 470k res and be done? Are their affects on the mixer op-amp... btw I run the board in
2004-12-02 by Michael
I completed the Wave Multiplier project last night, the thing is pretty crazy sounding. I have no idea what it's supposed to sound like but hey, it sounds cool to me. I'm gonna do a couple tweaks to get better control, the PWM CV and the Fold CV to not sweep enough for my taste a
2004-12-02 by peng3002
Hold up before replacing the pot. I had a similar problem ith the Res pot. It actually came from other pots/jacks not being grounded. Next to the power supply header there is a "6V" hole on the pcb. Make sure if your using this hole to run a ground line to pots/jacks to solder a
2004-12-02 by hiriseau
thanks i will get another one pronto, its a sealed pot so nothing i can really do about it. and its only a couple of dollars to get a new one. with the level, considering that i will be using the filter in a tweak hard on the fly sort of role, would i be better off using the trim
2004-12-02 by sasami@hotkey.net.au
>the resonance pot is EXTREMELY crackly whenever i move it. That's a dud pot. It isn't a solder issue, but rather dust or "corrosion" on the pot resistive strip. A shot of electrolube contact cleaner may help. A better pot is the best solution. >secondly, levels. i have the link
2004-12-02 by hiriseau
hey guys, well i finally got most of my parts together, enough to get it working anyway. i built it per the schematic revision and guide, im using an opa227 (because i had it lieing around from another project) and i added 2.2k in paralell with the 1k per john's advice. i do have
2004-11-27 by geoff james
kris fred mcniff of FM music may still have some.(google for his website) there not cheap. regards geoff james ----- Original Message ----- From: Kris Bishop To: cgs_synth@yahoogroups.com Sent: Friday, November 26, 2004 12:29 AM Subject: [cgs_synth] Hi Hi, My name is Kris Bishop
2004-11-26 by sasami@hotkey.net.au
Of note- the first run of Steiner PCBs gave an inverted output, so there may be 10 to 20 CGS Steiners that already have inverted outputs. Ken >Hi Fernando, > >> What I mean is to redirect the output to the BP input externally, >> using other modules >> (VCA), without applying any
2004-11-26 by Fernando
Great, thank you very much! >reasonably well May be some gain needs to be applied. Sometimes is about 4x... > > Anyone tried this or like to try? =:) > > I tried this last night, taking the Steiner O/P through an Oakley VCA > and back into the BP input. Works reasonably well like
2004-11-26 by Andy Wilson
Hi Fernando, > What I mean is to redirect the output to the BP input externally, > using other modules > (VCA), without applying any mod to Ken's standard Steiner PCB. > > The experiment should be done having the Resonance control to minimum > and controlling > an external VCA. T
2004-11-25 by Kris Bishop
Hi, My name is Kris Bishop and I'm currently trying to build an analogue synthesizer based on the Elektor formant. I'm just browsing just now but would love it if anyone knows where I can find a ua726 paired transistor. I'll be looking for alternative modules in the future once I
2004-11-25 by cgs@oldmail.charlielamm.com
Fernando: I dunno, I just had an extra VCA so I wired this up in about 5 minutes. It was that or have the VCA just sit there doing nothing so I wired it! If I ever pull the module out again I will look to see if I drew this different than how I wired it up, I don't think I did bu
2004-11-24 by Fernando
Thanks Josue, I imagine it could be possible externally. I was looking at the schematic when I frst posted the question. Just wanted some "real life" report about how it worked. I does not seem so evident as with other filter designs... Charlie, your mod looks cool and minimal, t
2004-11-24 by ALMAGATA@telefonica.net
Hola Fernando! Yes You can do VC resonance this way. Just remember to invert the signal, using an inverting VCA (-input) or using a spare inverter. This is the way for VC Res from the 70`s.... Best Regards, Josue. ----- Mensaje Original ----- De: "Fernando" fdi@... > Fecha: Mierc
2004-11-24 by Fernando
Thanks Ryan and Charlie for your help and info. What I mean is to redirect the output to the BP input externally, using other modules (VCA), without applying any mod to Ken's standard Steiner PCB. The experiment should be done having the Resonance control to minimum and controlli
2004-11-23 by cgs@oldmail.charlielamm.com
I have done this with a VCA and some resistors. It works OK, not great, but OK, here is a wiring diagram http://www.charlielamm.com/synth/steiner/cgs35wire.pdf Main page is here: http://www.charlielamm.com/synth/steiner/index.php Info on the VCA is here: http://www.charlielamm.co
2004-11-23 by Ryan Williams
I haven't tried it but I think it should work. the normal res pot adjusts the gain of an amplifier and and that amp is run right back into the BP input anyway. I had a plan to build a modified version that had VC-Resonance. I just won't have to time try it out till I finish some
2004-11-23 by Fernando
Hi all, I wonder about an external resonance circuit by sending the output back to the BP input via VCA. Anyone tried this? Fernando
2004-11-20 by sasami@hotkey.net.au
Take the COM line to your 0V connection. Do not connect 0V/COM directly to the case earth. Instead, place a 1K 5W resistor between the case and your 0V/COM connection. This will help prevent earth-loops. The +S and -S lines are sense lines. Using ordinary hook-up wire, connect th
2004-11-20 by stuadh
Disregard the last message, I've worked out what I was doing wrong. I just needed to reroute power from the Dilithium crystals... Stuadh If only I could get my CGS VCO to work... --- In cgs_synth@yahoogroups.com , "stuadh" wrote: > > If I may high-jack this thread briefly, it is
2004-11-20 by stuadh
If I may high-jack this thread briefly, it is on the subject of Power-One PSUs. I've just built a 6U case, incorporating a dual output (HCC-15-3) unit. The case has a single distribution board (for now) with power going in centrally (to combat line overload) and the + and - lines
2004-11-20 by sasami@hotkey.net.au
>BTW, If you're outside of the US NEVER buy from Allied. I thought >this shipping charge was large because of the weight of the Power >One PSU's, so last month I foolishly ordered some Vactrols and 20 of >8 pin IC's that would fit into a jiffy bag and Mouser would charge >$12 by
2004-11-20 by allanjhall
Power One PSU's are pretty expensive in the UK, so I bought three of them online from Allied in the US - they charged me $128 shipping (OUCH!) and I had to pay 17.5% vat and 10% duty before UPS would release them, so they ended up costing me over 100$ each, which is about the sam
2004-11-20 by Richard Brewster
The Power-One HAA15-0.8-A, which provides + and - 15V at 800ma and is the guts of the Synth Tech MOTM-900 supply, is available for $45 US from Digi-Key. How much more costly is that than what you are building? Maybe the Power-One supplies cost more outside the US? -Richard Brewst
2004-11-20 by jgwong
So how did it work out ? Last time I built a + - 15 psu I used a 36v center tap xfrmr and an LM 723. I'd be interested in a cheaper solution. Everything else I tried was anemic, broadcasted, spikey, got hot fast... basically crap. G wong > Date: Fri, 19 Nov 2004 09:51:49 -0000 >
2004-11-19 by allanjhall
Many thanks for the help Ken, it all makes much more sense to me now :-) I think I'll try it with 15-0-15 and check voltage across caps with scope and fit a 18-0-18 transformer if its looking too marginal under load - I'm trying to keep the heat from the heatsinks as low as possi
2004-11-18 by sasami@hotkey.net.au
>I'm going to be using the +/-15v psu's to supply some of the digital >modules in my system to keep noise away from analog module power >rails. Is there any reason why I couldn't attach the regulators to >the pcb with short (50 to 100mm) flying leads so that they could be >remote
2004-11-18 by allanjhall
Hi Ken and group, I'm going to be using the +/-15v psu's to supply some of the digital modules in my system to keep noise away from analog module power rails. Is there any reason why I couldn't attach the regulators to the pcb with short (50 to 100mm) flying leads so that they co
2004-11-18 by Olivier Biron
--- In cgs_synth@yahoogroups.com , sasami@h... wrote: > > >> >i got an sh5 how got the mixer module all broken > >> >what shoud i do. > >> >try to make a modulard from theis beast ???? > >> > >> Either modularize it (i've done it once - a lot of hard work) or replace the > >> mix
2004-11-18 by sasami@hotkey.net.au
>> >i got an sh5 how got the mixer module all broken >> >what shoud i do. >> >try to make a modulard from theis beast ???? >> >> Either modularize it (i've done it once - a lot of hard work) or replace the >> mixer. It's a very simple circuit - just a collection of switches, a fe
2004-11-17 by Olivier Biron
--- In cgs_synth@yahoogroups.com , sasami@h... wrote: > > > > > >i got an sh5 how got the mixer module all broken > >what shoud i do. > >try to make a modulard from theis beast ???? > > Either modularize it (i've done it once - a lot of hard work) or replace the > mixer. It's a v
2004-11-17 by sasami@hotkey.net.au
> > >i got an sh5 how got the mixer module all broken >what shoud i do. >try to make a modulard from theis beast ???? Either modularize it (i've done it once - a lot of hard work) or replace the mixer. It's a very simple circuit - just a collection of switches, a few pots and an
2004-11-17 by Olivier Biron
i got an sh5 how got the mixer module all broken what shoud i do. try to make a modulard from theis beast ????
2004-11-11 by Larry Hendry
Hey Ken, How about a V-twin simulator. I need to change the ring tone in my Harley Davidson telephone to something that sounds like a Harley. :-) > I am interrested in building Ken's design for a V8 engine > simulator. > My intention is to install it in my 1991 Miata to fool peop
2004-11-11 by leolilp
Hi, I'm new to the group. I am interrested in building Ken's design for a V8 engine simulator. My intention is to install it in my 1991 Miata to fool people into thinking that I have a big block V8 undet the hood. But, I don't want to go through all the trouble without first hear
2004-11-08 by sasami@hotkey.net.au
If anyone finds images missing from any CGS page (or any other missing file for that matter) please let me know. There were a few problems when I transferred to a new server recently, and I have apparently "lost" a few files during the transfer. I of course have the files backed
2004-11-08 by sasami@hotkey.net.au
>Just to confirm, when you refer to th eCW or CCW end of a pot, >which point of view are you using: >a. from the user end, looking down the shaft, Correct. _______________________________________________________________________ Ken Stone sasami@... or sasami@... Modular Synth PCB
2004-11-08 by Larry Hendry
--- stuadh stuadh@... > wrote: > Just to confirm, when you refer to the CW or CCW end of a pot, > which point of view are you using: > > a. from the user end, looking down the shaft, This one. Additionally CCW (all the way down in guitar speak) causes little or no resistance rom
2004-11-08 by stuadh
Just to confirm, when you refer to th eCW or CCW end of a pot, which point of view are you using: a. from the user end, looking down the shaft, b. from the constructor's end, looking from behing the front panel? Also, is anyone good at trouble shooting? I'm still trying to get my
2004-11-07 by stuadh
Hi List, I've just finished my VCO, and inevitably, it isn't working right. I'm looking for some guidance as to what I might have done wrong. I've gone for the full spec less the Fine Tune and the third 1V/O. Everything else is there. I plugged it in to go through the set-up, and
2004-11-05 by hiriseau
Thanks for the reply ! > Use a good quality machined pin IC socket. Then you can experiment. I > doubt you will find much audible difference whatever op amp you use. > The sound quality of this filter depends more on the other parts, > expecially the quality of the capacitors and
2004-11-04 by sasami@hotkey.net.au
>so i wanted to know how much current you guys think the synthacon >would draw? not much at all. I haven't measured it, but it would be under 50ma. >the next option for parts i already have would be to create a virtual >ground circuit with a buffer (i have buf634's) that can appa
2004-11-04 by Richard Brewster
Hi, I suggest looking through the Yahoo archives for this group for synthacon related posts. You will find a lot of good information. I discovered that it is important to beta match the transistors. hiriseau wrote: >with the op amp, i've come from building headphone amps and have
2004-11-04 by stuadh
Hello again, I have just about finished populating the VCO board, and I'm turning my attention to the panel. I have to confess to being a bit unsure of what I need. I'm going for a full spec VCO this time, (might as well) and I'd appreciate some guidance on what is a CV In, an ou
2004-11-04 by hiriseau
ok after doing some research ive realised i can get a dc plug pack, then run that in to a rail splitting circuit and from there in to linear regulators. i was going to get a 24vdc power pack that would deliver 500ma. but i have no idea how many ma the synthacon (and lm3915 circui
2004-11-04 by hiriseau
hey guys, so ive ordered the pcb's for the synthacon project but i have a few questions about ancilliary stuff for it. i was planning on setting it up in a 1ru case as a stand alone mono unit (early plans for stereo have been shelved for the moment, maybe in the future ;) ) the l
2004-11-03 by sasami@hotkey.net.au
The OUT 2 bus is made by connecting all OUT 2 pads together and running them to point B on the bixer, as stated. this works because the mixing resistors are already on the bandpass filters. The master level pot, if required, still goes between A and B as per the mixer instruction
2004-11-02 by stuadh
I'm nearly finished a 3 channel formant filter as suggested on the CGS site. I have a question about wiring the filters to the mixer, before I blow anything up. Where does the OUT bus go to? Does it go to one of the inputs on the mixer, or like it appears to suggest on the GCS 30