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2012-12-23 by sasami@hotkey.net.au
>That's good to know Ken ! >Do you recommend using the HFE to match the transistors in your vco instead of the lm394 ? >I'm not concerned about 1v/o tracking being super accurate. If you aren't worried about accuracy, sure, that would do the trick. Separate transistors will never
2012-12-23 by adematteo
That's good to know Ken ! Do you recommend using the HFE to match the transistors in your vco instead of the lm394 ? I'm not concerned about 1v/o tracking being super accurate. Also, how do you "join" the 2 transistors together ? Thanks for any info, this is all new to me and if
2012-12-22 by aliis
hi everyone, i have just decided to join kens group. trouble is im not much of a diy person...lacking the nescessary tricity skilz and all so forgive me if i'm intruding but i wonder if maybe some of these projects arn't too hard. My soldering is getting better tho my eyesite is
2012-12-22 by Adrian Corston
On 12/13/2012 06:52 AM, fuyuhiko wrote: > > Hi there. This is a beginner question. > > I'm planning to make the VCO but what does 1k 3300ppm Temco mean on > the parts list? > It's for the temperature compensation, isn't it? But what kind of > resister do I need to use, just 1% me
2012-12-22 by florisvanhoof
wow! good idea, how are you planning to use it? I'm really very curious for patch examples and ideas about this. I've used the res eq for the first time live last week, it's fun to use over a large p.a. system! http://www.endlesswebsite.tk/
2012-12-21 by cg_synth
My "dirty little secret" for matching my transistors is to plug them into the HFE test function of a cheap multimeter. --- In cgs_synth@yahoogroups.com , Richard Brewster wrote: > > Last week I built a DUSG and matched the transistors using the method > described in Electronotes
2012-12-21 by Stephen Richards
Yes , i does , many thanks Dave. ________________________________ From: Dave Kendall davekendall@... > To: cgs_synth@yahoogroups.com Sent: Friday, December 21, 2012 10:03 AM Subject: Re: [cgs_synth] 1 uf BP electrolytic capacitors for CGS113 Hi Stephen. > Suppose i just needed to
2012-12-20 by Dave Kendall
Hi Stephen. > Suppose i just needed to know the BP ones were not essential in this > design. Bipolar (BP) and non-polar (NP) are different names for the same thing, and *must* be used where the schematic says so. Regular electrolytics with + and - markings on them will screw up o
2012-12-20 by Stephen Richards
Thanks Dave , i might go with those , i'm pretty sure i have some. Suppose i just needed to know the BP ones were not essential i this design. ________________________________ From: Dave Kendall davekendall@... > To: cgs_synth@yahoogroups.com Sent: Friday, December 21, 2012 4:28
2012-12-20 by Dave Kendall
Hi Stephen. You can get small MKT or WIMA type 1uF poly non-polarised capacitors now quite cheaply. Things to check are the voltage rating (35V or more), and the pin spacing. The ones Rapid sell in the UK are 5mm pitch. cheers, Dave On 20 Dec 2012, at 11:40, Stephen Richards wrot
2012-12-20 by Richarius Molindarius
Again, sorry about that. I just looked at the schematic and saw that they're NPN's. I'll have to pull VCAs out and see which tranny that it WERE that I had matched. I remember that the trannies were on tape, that I was matching from ... I'll pull them out and check the part #. Wh
2012-12-20 by Richarius Molindarius
Wha'? Who? Whoa ... did I say that? :o Lol. Sorry about that Ken / etc. It were 4 or 5 years ago that I built those 4. Maybe it were the 2N3906's that I matched that way then. I'll have to check. On Thu, Dec 20, 2012 at 5:21 AM, sasami@... > wrote: > ** > > > Wrong transistors! W
2012-12-20 by Stephen Richards
thanks Ove ________________________________ From: Ove Ridé nitro2k01@... > To: cgs_synth@yahoogroups.com Sent: Thursday, December 20, 2012 11:33 PM Subject: Re: [cgs_synth] 1 uf BP electrolytic capacitors for CGS113 On 20 December 2012 12:40, Stephen Richards okayjustalittle@...
2012-12-20 by Ove Ridé
On 20 December 2012 12:40, Stephen Richards okayjustalittle@... > wrote: > Hi Ken and all > > I'm unfamiliar with 'BP' caps , does this mean bipolar ? Can i just use > 1uF garden variety electrolytics. Normally, electrolytic capacitors are polarized, meaning that they can only be
2012-12-20 by sasami@hotkey.net.au
Yes, BP is bipolar. Bipolar is also called non-polarized, so no, you cannot use a garden variety electro. Ken >Hi Ken and all > >I'm unfamiliar with 'BP' caps , does this mean bipolar ? Can i just use 1uF garden variety electrolytics. > >[Non-text portions of this message have be
2012-12-20 by Stephen Richards
Hi Ken and all I'm unfamiliar with 'BP' caps , does this mean bipolar ? Can i just use 1uF garden variety electrolytics. [Non-text portions of this message have been removed]
2012-12-20 by sasami@hotkey.net.au
Wrong transistors! We are talking about the 3x BC548 that drive the matched dual transistor. >Those in the 4 VCAs that have matched trannies (2 I believe and SSM2210s in >the other 2. 2 more to build.) ... were matched using the ancient Minimoog >technique. >For Ian's matching me
2012-12-20 by Richarius Molindarius
Those in the 4 VCAs that have matched trannies (2 I believe and SSM2210s in the other 2. 2 more to build.) ... were matched using the ancient Minimoog technique. For Ian's matching method I DO have a 5 1/2 digit high end bench meter. I'm ok there and will be using that method for
2012-12-20 by Stephen Richards
Thanks Ken ...it seems the naughty pixies have returned my lost 10M resistors. ________________________________ From: " sasami@... " sasami@... > To: cgs_synth@yahoogroups.com Sent: Thursday, December 20, 2012 5:16 PM Subject: Re: [cgs_synth] CGS113 - Serge VC WAve Mult >Can i su
2012-12-20 by sasami@hotkey.net.au
>Can i substitute 11M for the 10M in this one ? Maybe. It probably won't make much difference. Needless to say I have not tried it. Ken _______________________________________________________________________ Ken Stone sasami@... otherunicorn@... Modular Synth PCBs for sale http:/
2012-12-20 by Stephen Richards
Hi Ken Can i substitute 11M for the 10M in this one ? [Non-text portions of this message have been removed]
2012-12-20 by adematteo
Thanks Ken, i haven't actually wired it up yet but just noticed the note after reading over your page tonight.I'll wire it up and see how it sounds.Thanks,Tony --- In cgs_synth@yahoogroups.com , sasami@... wrote: > > If it is working to your satisfaction, leave it alone. :) If th
2012-12-20 by sasami@hotkey.net.au
If it is working to your satisfaction, leave it alone. :) If the transistors are from the same batch, chances are they match already. Ken >Hi guys, >I recently built up the vca3 boards and didn't realize until after the fact that it's recommended to match the bc548's. > >The fact
2012-12-20 by adematteo
Thanks for the info Richard.This will be the first time i've tried matching my own so definitely appreciate the insight. Is this info copyright protected or is there somewhere on the web i can view this technique ? Thanks,Tony --- In cgs_synth@yahoogroups.com , Richard Brewster w
2012-12-20 by Richard Brewster
Last week I built a DUSG and matched the transistors using the method described in Electronotes #39, p. 6. It's much simpler than Ian Frijtz's method, which I tried first. I had trouble getting enough resolution on my measurement, only two digits of precision. With the EN approac
2012-12-20 by adematteo
Hi guys, I recently built up the vca3 boards and didn't realize until after the fact that it's recommended to match the bc548's. The fact that it's mentioned on Kens page makes me wonder if i should pull them and match them (ie. how critical is this ?) ? Which leads to my second
2012-12-17 by sasami@hotkey.net.au
> 1. The initial pulse width knob does nothing. I have a 100k linear pot with T1 connected to -VE, wiper to PWM, and T2 connected to +VE. The PWM input works exactly as expected. Bridge the input pad to the resistor. It looks like a track has gone missing. (Practically invisible!
2012-12-17 by daveholt3283
I've now wired up two identical CGS VCOs and am having identical issues with both of them. 1. The initial pulse width knob does nothing. I have a 100k linear pot with T1 connected to -VE, wiper to PWM, and T2 connected to +VE. The PWM input works exactly as expected. 2. The sub p
2012-12-15 by Joachim
In that case 1 uF is definitely enough. Am 14.12.2012 22:53, schrieb Stephen Richards: > Cheers Joachim > > A 5k trimmer was how i was going to go. In that case would you be using a 1uF or 3.3uF cap ? > > > ________________________________ > From: Joachim sonicwarrior@... > > To:
2012-12-14 by roglok
Thanks guys, Sounds like I can improvise something there :) Cheers! --- In cgs_synth@yahoogroups.com , sasami@... wrote: > > There are a few qpots where you could put a hole, but they are not all at > corners. > > Ken > > >Hi Ken, > > > >I am planning to get a Euro VCS, but I not
2012-12-14 by Stephen Richards
Cheers Joachim A 5k trimmer was how i was going to go. In that case would you be using a 1uF or 3.3uF cap ? ________________________________ From: Joachim sonicwarrior@... > To: cgs_synth@yahoogroups.com Sent: Saturday, December 15, 2012 7:47 AM Subject: Re: [cgs_synth] CGS 58 -
2012-12-14 by Joachim
Hi Stephen, there is a bit of reading here regarding minimum rate speed mod: http://electro-music.com/forum/viewtopic.php?p=258870#258870 Here are my mods (and some embarrassing n00b errors): http://electro-music.com/forum/viewtopic.php?p=365448#365448 If you read until my last p
2012-12-14 by sasami@hotkey.net.au
There are a few qpots where you could put a hole, but they are not all at corners. Ken >Hi Ken, > >I am planning to get a Euro VCS, but I noticed that the PCB has been designed for panel mounting and thus lacks universal mounting holes. > >I'd like to do my own front panel design
2012-12-14 by Richarius Molindarius
Right. The frequency change when adjusting the waveshape. That's what I had found with a similar variable waveshape LFO that I had made from Barry Klein's book back in the 90's. It's just something that you'll have to live with, if I'm not mistaken. I know that both Serge and Buc
2012-12-14 by David Holt
So, I wired my double Utility LFO per Fonik's (admittedly) untested schematic on his website with a switch to change speeds, and I've noticed that when in audio range, the saw and ramp are a little "laggy" and "filtered" sounding. Also, the pitch changes along the full sweep of t
2012-12-14 by Dave Kendall
Hi. Like Mr Richarius said - there is an interaction between the cap and the resistor (10K on the schemo) if values are much changed from the original. If the cap gets bigger and the resistor stays the same, I have had odd waveshapes at extremes of speed (at higher rates I *think
2012-12-14 by roglok
Hi Ken, I am planning to get a Euro VCS, but I noticed that the PCB has been designed for panel mounting and thus lacks universal mounting holes. I'd like to do my own front panel design and wondered if there is enough space to drill your own holes (e.g. through the ground plane)
2012-12-14 by Richarius Molindarius
Ohhhhh kay. Unnerstannable. :) Serge/CGS mentions on Muffwiggler just over a year ago, is what started by divebombing into almost complete Serge/CGS-Serge conversion. :) Ken's 58 IS a cool module. There's some nice functionality in there that will NOT tie up a USG. I'm addicted t
2012-12-14 by Stephen Richards
Thanks Richard I'm working on the CGS58 that is in the Best of CGS 'BOG' panel. Serge/CGS is my favourite format and what i do all of my live shows on. It's funny but i find myself wanting to make this LFO uber slow like the envelopes on the DUSG which is right next to it in the
2012-12-14 by Richarius Molindarius
For the integrator cap. as well keep in mind, if I'm not mistaken, you can't go with a polarized cap, like an electrolytic; tantalum; etc. Try going up to a 0.47. Also - in NON-waveform changing LFOs, I had always used at least a 1 meg size for the speed pot. That helps to give a
2012-12-14 by sasami@hotkey.net.au
>I just wanted to ask , is there a point that the relationship between the capacitor between pins 1 and 2 of the TL074 and the resistor in series with the Speed Pot becomes unworkable ; as far as reducing speed but keeping max. speed ? I've not tried it myself so I don't know, bu
2012-12-14 by Stephen Richards
Hi Ken I wanted to make the LFO rate slower so i choose Method 2 as per your build page. I replaced the 47n with a 100n to reduce the rate of the LFO (didn't change the resistor to reclaim the max. speed yet). It's still not really slow enough for my liking , so i'm going to keep
2012-12-13 by sasami@hotkey.net.au
>Though I will need to learn more about the TEMPCO, I assume the important thing is that the resistor needs to have physical contact with the transistor so as to dissipate{?) the heat of the transistor. No. It's there so it is at the same temperature as the transistor via both pr
2012-12-13 by fuyuhiko
Hi there thanks for the information not only by the posts but I've got some e-mails as well. Though I will need to learn more about the TEMPCO, I assume the important thing is that the resistor needs to have physical contact with the transistor so as to dissipate{?) the heat of t
2012-12-12 by Elby Designs
If temperature compensation is not critical to you or you need to get the unit running in the meantime, then fit a 1K 1% Metal Film resistor, will work fine unless you take the unit with you in to the sauna, then in to the cool room and then on to the beach and then up the mounta
2012-12-12 by sasami@hotkey.net.au
You need a 1k 3300ppm tempco. That IS what the part is. Yes, it's for temperature compensation. This one http://www.elby-designs.com/contents/en-us/p145.html will do the job. It is what I use. Other synth DIY sites may also sell them. >Hi there. This is a beginner question. > >I'
2012-12-12 by fuyuhiko
Hi there. This is a beginner question. I'm planning to make the VCO but what does 1k 3300ppm Temco mean on the parts list? It's for the temperature compensation, isn't it? But what kind of resister do I need to use, just 1% metal film? Kind Regards
2012-12-10 by sasami@hotkey.net.au
You would need to take each separate output from the output pins of the op-amps of each filter. The pots are on the INPUTS and thus are of no use as connection points. Put a 1k resistor between each output pin and its jack. I do not see there being any need for additional bufferi
2012-12-10 by r
if i wanted to expose each of the individual frequency bands as individual outputs, could i just tap off the outputs normally going to the wiper pots (a,b,c,d,f,h,i,k,n,u) straight to panel jacks? or would i need to buffer each output? would it make a difference if i wanted to ha
2012-12-10 by sasami@hotkey.net.au
I get 0.6V to 14V range at pin 10. Trimmer wiper is sitting at 11.57V. Ken >Hi Ken > >When reading (L pin 10 LM3900) with DMM ; it swings from fully CCW +2.54 to fully CW+2.07V. > >no jump or difference in voltage around 1pm mark at all. > >Should i check 'S' and 'R' ? > > >_____