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2007-10-06 by sasami@hotkey.net.au
Be aware the PCB should have been corrected since Richard found that error, so depending on the age of the PCB you have, the diode may be in the correct position. Ken >I had a similar problem. Basically I was loosing amplitude of the >signal through the capacitor at >below the th
2007-10-06 by Jason Proctor
i did exactly the same thing and experienced the situation you're seeing. the problem is that the 4024 triggers on the falling edge (yuck) rather than the rising edge, so the incoming clock has to be inverted before going to the chip, and since you took your feed off the 4024, yo
2007-10-06 by tommy_molotov
hi, I've build an ASR with an LED linked to the clock input... at the moment it simply lights up relative to the voltage presented to this input. What I'd really like would be if it flashed quickly whenever the shift register actually changed state - if I attached the CGS LED dri
2007-10-06 by djbrow54
I had a similar problem. Basically I was loosing amplitude of the signal through the capacitor at below the threshold of the transistor. There is plenty of signal to clock the 4024, it's just at the wrong level. I replaced that circuit with a two resistor and diode clamp to clock
2007-10-06 by sasami@hotkey.net.au
It sounds like the 100k pull-down resistor across the base/emitter of the transistor may not be soldered in propperly or is or the wrong value, or perhaps the 100n itself is bad, or the wrong value. Failing all else, if it works with the 100n shorted out, just run it that way. Th
2007-10-06 by Anthony Rolando
Hello, just finished building the Bi N Tic filter/ osc. and I have a couple of questions. I was getting quite a bit of slop on the Frequency panel control. It basically only worked from about 12:00 on... I traced this down to the 100n cap between pin 6 of the 3140 and the 100k th
2007-10-04 by Andre Majorel
On 2007-10-04 10:19 -0000, machvingtsun wrote: > --- In cgs_synth@yahoogroups.com , Andre Majorel > wrote: > > On 2007-10-02 15:52 -0000, machvingtsun wrote: > > > > > Ive built a CGS 14 clean power supply. Can I use a 12v or > > > 24v AC wall wart to power it. These are the only
2007-10-04 by Ove Ridé
On 04/10/2007, machvingtsun machvingtsun@... > wrote: > Thanks for the link Andre. One question though, in the > specifications its described as having two 115v primary, I assume > this is intended for a mains supply of 230V? If it says it has two 115v primaries, it most probably
2007-10-04 by machvingtsun
--- In cgs_synth@yahoogroups.com , Andre Majorel wrote: > > On 2007-10-02 15:52 -0000, machvingtsun wrote: > > > Ive built a CGS 14 clean power supply. Can I use a 12v or 24v AC wall > > wart to power it. These are the only reasonably priced transformers > > here (Ireland). > > >
2007-10-03 by Andre Majorel
On 2007-10-02 15:52 -0000, machvingtsun wrote: > Ive built a CGS 14 clean power supply. Can I use a 12v or 24v AC wall > wart to power it. These are the only reasonably priced transformers > here (Ireland). > > Or does anyone know where I could salvage or buy for a reasonable > p
2007-10-02 by machvingtsun
Ive built a CGS 14 clean power supply. Can I use a 12v or 24v AC wall wart to power it. These are the only reasonably priced transformers here (Ireland). Or does anyone know where I could salvage or buy for a reasonable price a center tapped transformer? Regards, Michael.
2007-09-27 by sasami@hotkey.net.au
>thaks for the suggestions, I'll look for a 7555. btw -I have a 1 meg >pot and 4.7uf for the timing discharge cap. As good a combo as any. Ken > >-Jeff > >--- In cgs_synth@yahoogroups.com , sasami@... wrote: >> >> > looking at the 555 cookbook, it's possible to get variable pulse
2007-09-27 by Jeff Foster
hey folks, I came across another option cd4538 mon stable chip. On The blacet web site it shows this being used as a gate length control. Any advantage of this over a 555 solution? App notes show a "non- retriggerable mono stable...hmm I think this would ignore any clock pulse un
2007-09-27 by Jeff Foster
Great. I rigged up a 556 on a breadboard tonight and it worked. Even have a trigger LED on the output..whee I have a 1 meg pot which seems to give good control of gate on time, but the adjustments are all bunched up at the start of the pot(full cc). I guess its a log vs. linear t
2007-09-26 by sasami@hotkey.net.au
> looking at the 555 cookbook, it's possible to get variable pulse >width with the right circuit. >Rig Of course it is. The monostable suggestion just adds versatility. Note that using a 7555 will be better than a 555 as the latter is murder on the power rails. Ken ______________
2007-09-26 by Mark Rauch
Howdy, looking at the 555 cookbook, it's possible to get variable pulse width with the right circuit. Rig --- In cgs_synth@yahoogroups.com , "Jeff Foster" wrote: > > > Peter, > I think the 555 can be many things...I'll look at Ken's 4006 clock > as well. maybe it can drive the 55
2007-09-26 by Peng
"I recently got in on building Mr Stone's designs by buying PCBs for a sequencer/programme r and an Analog Shift Register." When you get the ASR going, take a look/listen to the stuff in the Files section under "ASR clock question". I'm trying to figure out if my ASR is functioni
2007-09-26 by Jeff Foster
Peter, I think the 555 can be many things...I'll look at Ken's 4006 clock as well. maybe it can drive the 555 .... thanks JEff --- In cgs_synth@yahoogroups.com , Pete wrote: > > As far as I understand, the output of a 555 based clock is a square wave. I > would suggest you build
2007-09-26 by Jeff Foster
Thanks Ken, I found a schema with monostable set and duration calculator. It also has a trigger input netwrok wot trigger on rising edge of clock. I bread board it and see whay happens...fun fun thanks Again Jeff --- In cgs_synth@yahoogroups.com , sasami@... wrote: > > Wire up th
2007-09-25 by sasami@hotkey.net.au
Any 100n will do. Ordinary ceramic, mylar etc. as long as you can fit it there physically. By the way, the monolithic ceramics are not hard to find. They are probably the most common cap there is - they are also the bottom rung of the quality tree as their job does not require an
2007-09-25 by NoRMaN PHaY
Hello! I recently got in on building Mr Stone's designs by buying PCBs for a sequencer/programmer and an Analog Shift Register. I've just about finished up populating the sequencer/programmer boards, I just have the little caps on the back side of the board to do. The 1206 SMD ca
2007-09-25 by sasami@hotkey.net.au
Wire up the 555 as a monostable, and use its output as your variable pulse length.. You can then drive the 555 from any square wave clock and still get a variable gate pulse length. Forget about using a flip flop. Ken >Hi Folks, >I am getting around to building the gate seq as an
2007-09-25 by Pete
As far as I understand, the output of a 555 based clock is a square wave. I would suggest you build the VC clock from the CGS31 - Digital Noise. Just omit everything at the 4006 and keep the circuitry before it. This way you could patch in an external clock if you needed too. I u
2007-09-25 by Jeff Foster
Hi Folks, I am getting around to building the gate seq as an "analog sequencer". I am adding an on-board clock and have a few questions. I don't want to use a square wave because then the on and off times are the same. I need a variable on off clock. I think I can use a 555 timer
2007-09-25 by Jan-Ahrent Czmok
Hi, i am reoptimizing my system, thereof i sell some modules, in MOTM Form Factor. Photos are in http://www.flickr.com/photos/jczmok/sets/ 72157602140274034/ - WAVESHAPE VCO , PCB by Ken Stone, 3U fully enhanced version - asking 199 EUR - MOON VCO, PCB from Curetronic, 3U fully e
2007-09-20 by x24holsey
--- In cgs_synth@yahoogroups.com , "Laurie Biddulph" wrote: > > Does anyone have a problem with the offset voltage generated when > either or both of the oscillators with triangle outputs are turned off > and in the triangle position? Yes, OFF should be simply that. > Would users
2007-09-20 by Laurie Biddulph
Does anyone have a problem with the offset voltage generated when either or both of the oscillators with triangle outputs are turned off and in the triangle position? Would users prefer that these 2 oscillators not be able to be turned off and that the `off' position actually sle
2007-09-19 by sasami@hotkey.net.au
>old topic, but any progress ken ? Alas, not. I've had too many other interruptions this year. Ken > >cheers > >OLLIE > > >> >> >> >When will the ADSR module be ready ? >> >> Some time after I finish answering all the emails asking when the >ADSR will >> be ready..... >> >> Call
2007-09-18 by synth_ollie
old topic, but any progress ken ? cheers OLLIE > > > >When will the ADSR module be ready ? > > Some time after I finish answering all the emails asking when the ADSR will > be ready..... > > Call it next year. If it arrives sooner, you'll have a plesant surprise. > > Ken
2007-09-13 by Mark Rauch
Howdy, Called Josh on the phone and YOU ARE EXACTLY RIGHT!!!! If I was Monte Hall, I'd have the pretty models gracefully wave their hands around all the wonderful prizes you'd won. Rig --- In cgs_synth@yahoogroups.com , "bbluthang" wrote: > > > Hi > it sounds like you are looking
2007-09-13 by bbluthang
Hi it sounds like you are looking at panel photos for a CGS VCO the psycho LFO has no inputs, 3-5 pots, an output jack and a switch. check out Ken's page on how to put it together http://www.cgs.synth.net/modules/psycho_lfo.html andrew --- In cgs_synth@yahoogroups.com , "Mark Rau
2007-09-12 by Mark Rauch
howdy, i received a pscho lfo kit from Josh Summit. It is a basic kit but in the panelphotos there are are holes for sync,CV,FRAC,Shape CV, PWM, staircase sqr, saw AC, saw DC, a big knob for waveshape, etc. Anyone know where to find these mods? As long as i'm building, might as w
2007-09-12 by bill bigrig
howdy, OK, how do i hook up the switches? Thanx Rig --- sasami@... wrote: > There is only one jack in the psycho LFO. If you > mean Super Psycho, the > others would be switches, not jacks. > > If they really are extra jacks, you would need > inverting buffers between > each and t
2007-09-11 by sasami@hotkey.net.au
There is only one jack in the psycho LFO. If you mean Super Psycho, the others would be switches, not jacks. If they really are extra jacks, you would need inverting buffers between each and the corresponding outputs of the individual oscillators in it. Ken >howdy, > > received a
2007-09-11 by Mark Rauch
howdy, received a psycho lfo kit and there is only one jack. yet, in the picture included with the instructions there are many jacks. How do I hook them up and what do I need to build between them and the board? Rig
2007-09-11 by Jason Proctor
thanks to all who responded. the MOTM-700 and 420 remain still.
2007-09-11 by Jason Proctor
selling off some unneeded duplicates etc. i built the CGS stuff, i'm not quite remembering who built the MOTM stuff - everything has always worked fine for me. MOTM-420 filter - $250 MOTM-700 switch - $200 CGS infinite melody behind nice FPE panel - $150 CGS diatonic converter be
2007-09-07 by peng3002
I posted a text file and a few mp3's of my ASR controlling a VCO. Look under - Files, "ASR Clock Question". I'm hoping others with an ASR module can tell me if this is normal behavior or I have something wrong here. I have built two with differing parts and they behave the same w
2007-09-06 by sasami@hotkey.net.au
Odd. Exceeding something somewhere? Try adding a resistor in series with the top end of a pot and seeing if that eliminates it. Ken >One more question (after a long session last night) > >I have the eight pots set up with +15v coming in, then out to a 200K >resistor and then on t
2007-09-06 by Scott Deyo
For MFOS stuff you can use a 1k tempco. Change the summing resistors from 100k to 49k9 to compensate. Cheers, Scott Deyo The Bridechamber contact@... www.bridechamber.com On Sep 6, 2007, at 9:46 AM, gino wong wrote: > Bridechamber sells Tempcos and SSM 2210 them at a great price.
2007-09-06 by Andrew
One more question (after a long session last night) I have the eight pots set up with +15v coming in, then out to a 200K resistor and then on to the I1, I2, I3, etc Things work properly, *but* there is a voltage "bump" at the upper end of each pot's range and it seems to leak int
2007-09-06 by gino wong
Bridechamber sells Tempcos and SSM 2210 them at a great price. Because of my setup I have to wait for my people to send Scott a check and all that and I needed some quick. I tend to be loyal so unless Scott is charging $8 I will be buying them from him mostly. I got the 1k 3500pp
2007-09-05 by sasami@hotkey.net.au
>Well I know why my first Sequential Switch did the pop 'n smoke >thing... wrong chips! 4051 isn't 4015 :) That would make a minor difference :) >On my "fixed" version, the current step LED takes about 3 seconds to >totally go dark when I remove power. Is that an indicator of som
2007-09-05 by Andrew
Well I know why my first Sequential Switch did the pop 'n smoke thing... wrong chips! 4051 isn't 4015 :) On my "fixed" version, the current step LED takes about 3 seconds to totally go dark when I remove power. Is that an indicator of something wrong or is that OK ? Drew
2007-09-05 by Scott Deyo
I hear that Bridechamber place sells the 1K for $3.50 each, and SSM2210s for cheap, too... ; ) Scott Deyo The Bridechamber contact@... www.bridechamber.com On Sep 5, 2007, at 8:12 AM, Jason Hollis wrote: > The deal they gave me was: > > -------- > > PT146 1K ohm 1% > @25 C > TC 3
2007-09-05 by Jason Hollis
The deal they gave me was: -------- PT146 1K ohm 1% @25 C TC 3500 ppm/degree C 10 pc.min.@$7.50 ea. 13 pcs.thru 100 pcs.@$2.00 ea.Plus $50 set up charge PT146 2K ohm 1% @25 C TC 3500 ppm/degree C 15-99 pcs.@$3.54 ea.Plus $50 set up charge Lead time: 1000 ohms - stock and could sh
2007-09-04 by gino wong
I just biought a small pile of 1k 3500ppm pt146 freom Precision Resistor. I asked for Priority mail shipping and a Thursday order bought my semis in on the following Tuesday . Mind you a holiday weekend. The best deal is to buy 25 or more that is where the shipping break is, othe
2007-09-04 by Pete
Excellent, thanks Ken. On 9/4/07, sasami@... sasami@... > wrote: > > > > > I was wondering if I could substitute, BC547 and BC557 with 2n3904 and > >2n3906? I just need to rotate them opposite of the PCB right? > > Correct. > > Ken > ______________________________________________
2007-09-04 by sasami@hotkey.net.au
> I was wondering if I could substitute, BC547 and BC557 with 2n3904 and >2n3906? I just need to rotate them opposite of the PCB right? Correct. Ken _______________________________________________________________________ Ken Stone sasami@... Modular Synth PCBs for sale http://www
2007-09-04 by Pete
I was wondering if I could substitute, BC547 and BC557 with 2n3904 and 2n3906? I just need to rotate them opposite of the PCB right? I have plenty of the 2n parts but no BC parts. thanks, pete -- http://www.myspace.com/23isgood [Non-text portions of this message have been removed