Elektor Formant Modular

Thats good mate, you might be best taking a brake fom the VCO for a day or 
two. Fresh eyes spot the most obvious things.
Kris



>From: ganesha <goaqihai@...>
>Reply-To: ElektorFormant@yahoogroups.com
>To: ElektorFormant@yahoogroups.com
>Subject: RE: [ElektorFormant] problem with formant pro vco (new design)
>Date: Fri, 14 Apr 2006 20:22:45 +0100 (BST)
>
>Yeehaa!!
>
>Because I was tired of the VCO I started building the
>multimode VCF. No problems at all, half a day of
>soldering and it works immediatly! And it sounds
>great. :-D
>
>regards, Kris
>
>--- Kris Bishop <bishopkris40@...> wrote:
>
>
>---------------------------------
>****Sykpe name Kris.bishop or use my hotmail email or
>biskri@...*****
>
>Sit back and smile first hurdle over, you now get a
>waveform, try plugging
>in earphones and listen...
>
>ok your currents look not too bad to me but try your
>new devices when they
>come, but I suspect you may have to solve your sine
>wave issue first..
>
>Can you check the waveform at IC2 pin 6, you should
>see a saw wave. if not
>then check:
>No sync input and no FM lin, check wave out at ic5 pin
>6. the only other
>issue I can see would bea couple of small components
>but I think we need
>these results first.
>
>Sorry but I'm only online until Sat 06:00, then off
>until 06:00 Wednesday. I
>work shifts and now since I have moved out I have no
>internet at home. If I
>can I'll get online at some point but slim chance. If
>you want a quick fix
>get skype... http://www.skype.com.....
>
>I'll be online from 18:00 - 06:00, I am working but
>spend most of my time on
>the PC. So no problems contacting me.
>
>Get back to testing you are soooooooo close.
>Kris
>
> >From: ganesha <goaqihai@...>
> >Reply-To: ElektorFormant@yahoogroups.com
> >To: ElektorFormant@yahoogroups.com
> >Subject: RE: [ElektorFormant] problem with formant
>pro vco (new design)
> >Date: Thu, 13 Apr 2006 21:37:00 +0100 (BST)
> >
> >Hello Kris,
> >
> >I got my CA3046's today, and finally I'm measuring a
> >current. It is not exactly what i hoped but it is
> >getting close. I expect the CA3086's to arrive in a
> >few days and then I'll compare them.
> >so here are my  readings:
> >0v CV : 0.002mA
> >1V CV : 0.004mA
> >2V cv : 0.009mA
> >3V Cv : 0.020mA
> >4V Cv : 0.052mA
> >
> >
> >I've been trying to adjust it with P5 But after about
> >1.5 hrs of adjusting I was going crazy and the
>results
> >  above are the best I get.
> >
> >But as I said, I'll try it again with the CA3086 to
> >see if that gives me better results.
> >
> >In the mean time the next problem is already waiting
> >for me. I took a look at the waveforms with my
> >oscilloscope and at all 4 points I have the same
> >waveform which is a sinus with a constant frequency
> >because changing the input cv doesn't affect it at
> >all...
> >
> >Any ideas?
> >
> >regards, kris
> >--- Kris Bishop <bishopkris40@...> wrote:
> >
> >
> >---------------------------------
> >No problem mate, sounds like this is the main issue
> >you have. The other
> >measurements I had asked you to make, showed that the
> >comparitor/schmitz
> >trigger is getting the correct signal you just need
>to
> >charge the capacitor
> >so that it will start the oscillations.
> >
> >If you are having trouble getting parts let me know
> >and I'll see what I can
> >find.
> >
> >Ca3086: I know a man in Edinburgh bought a lot of
> >these a few years ago, he
> >is a synth designer but he may sell you some if need
> >be. Ken Macbeth,
> >Macbeth studio systems. Not sure if they are for
>sale,
> >but he does know
> >someone else in china who sells them, just watch your
> >price! a ca3046 may
> >well be just as good.
> >
> >All the best mate, but let me know how you get on.
> >
> >Kris
> >
> >
> > >From: ganesha <goaqihai@...>
> > >Reply-To: ElektorFormant@yahoogroups.com
> > >To: ElektorFormant@yahoogroups.com
> > >Subject: RE: [ElektorFormant] problem with formant
> >pro vco (new design)
> > >Date: Tue, 11 Apr 2006 20:54:22 +0100 (BST)
> > >
> > >Hi,
> > >
> > >Now i'm sure my CA3086 is not ok, If i bend pin 5
>to
> > >measure the  current, I have 0.000mA.
> > >
> > >I also unsoldered tr3 to try to measure the current
> > >between pin3 of ic2, and the place where the
> > >collectorleg of tr3 should be soldered (this is how
> > >the German book says the current should be
>measured)
> > >and that also gave me 0.000mA.
> > >I'm going to order a couple of CA3086 and CA3046
>ic's
> > >and see if i can get it fixed with those.
> > >
> > >regards,
> > >kris
> > >--- Kris Bishop <bishopkris40@...> wrote:
> > >
> > > > Ok as I said this thing is strange in ways, the
> > > > output at IC 6 pin 5, You
> > > > need to look at the Current not the voltage,
> > > > although in electronics the two
> > > > are liknked it would be best that you check the
> > > > currents before disregarding
> > > > it.
> > > >
> > > > Do you know to test current you have to insert
>the
> > > > meter in series. Now
> > > > Since I had spares I cheated and simply bent pin
>5
> > > > to the side before
> > > > placing it in the socket, take your time and
> >you'll
> > > > be able to do it without
> > > > damaging devices, mind you I have been involved
> >with
> > > > Device manufacture for
> > > > a few years so I know you can get off with it.
> > > >
> > > > Connect one prob to the leg and then with the
> >other
> > > > press to the tracjk this
> > > > should allow you to see the current, you are
> >looking
> > > > for it to double for
> > > > every 1 V change. As for buying more, If they
>are
> > > > costing you alot of money
> > > > then make sure you can return it if it doesn't
> >work.
> > > > Also check that the
> > > > other connections to the device such as ground
>etc
> > > > are all ok. CA3046, there
> > > > is a difference but not sure what it is. I think
> > > > they were all bought up a
> > > > little while ago but I suppose you wont see much
> >of
> > > > a rise in price. It is
> > > > worth a go if you want and you can let us know
>how
> > > > you get on. Mind don't
> > > > pay silly prices for the chips, there is always
> > > > someone out there who will
> > > > sell for less.
> > > >
> > > > Looks like you are getting there though mate.
> > > >
> > > > Just for yoour information I use a midi to cv
> > > > convertor from Synhouse
> > > > http://www.synhouse.com/midijack.html
> > > >
> > > > Works great and it means that if you have synths
> > > > like mine then you can
> > > > connect the output of your modular to your
>synth,
> > > > control the pitch etc from
> > > > the synth and treat the output with your synths
> > > > effects and filters. Since
> > > > my newest purchase is an Access Virus TI this
> >works
> > > > great.
> > > >
> > > > Kris
> > > >
> > > >
> > > > >From: ganesha <goaqihai@...>
> > > > >Reply-To: ElektorFormant@yahoogroups.com
> > > > >To: ElektorFormant@yahoogroups.com
> > > > >Subject: RE: [ElektorFormant] problem with
> >formant
> > > > pro vco (new design)
> > > > >Date: Mon, 10 Apr 2006 22:37:58 +0100 (BST)
> > > > >
> > > > >Hi All,
> > > > >OK I did some more measurements:
> > > > >I think the CA3086 is the problem.
> > > > >At pin2 and pin5 I have these results:
> > > > >cv 0V -> IC6 pin2=-0.001V, ic 6 pin5=0.171V
> > > > >cv 1V -> IC6 pin2=-0.021V, ic 6 pin5=0.171V
> > > > >cv 2V -> IC6 pin2=-0.041V, ic 6 pin5=0.171V
> > > > >cv 3V -> IC6 pin2=-0.061V, ic 6 pin5=0.171V
> > > > >cv 4V -> IC6 pin2=-0.081V, ic 6 pin5=0.171V
> > > > >
> > > > >I tested also while turning p8 so the voltage
>at
> > > > >collector TR4 was 2.4V but the voltage at pin5
> > > > >remained the same for the 5 different CV
>sources.
> > > > >
> > > > >So at pin 2 everything seems to be ok, I get
> >-20mV
> > > > for
> > > > >each volt cv I add, But at pin 5 the voltage
> > > > remains
> > > > >the same, so I suppose this is the problem?
> > > > >
> > > > >Now for IC5 at pin4 I have 5.04V and at pin 5
>and
> > > > pin6
> > > > >
> > > > >  I have 0V.
> > > > >So Should I get another CA3086 or maybe a
>CA3046?
> > > > >
> > > > >regards, Kris
> > > > >
> > > > >--- Kris Bishop <bishopkris40@...>
>wrote:
> > > > >
> > > > >
> > > > >---------------------------------
> > > > >I sourced my CA's from university, they had
>been
> > > > there
> > > > >for years and used
> > > > >many times so I had to expect failures, we
> >students
> > > > >don;t look after things
> > > > >that well.
> > > > >
> > > > >Concentrate on getting a current in to the
> > > > comparitor
> > > > >section, look to get
> > > > >15uA or there abouts this should kick it off. I
> > > > would
> > > > >like you to test the
> > > > >voltages at IC5, I need to know what pins 4, 5
> >and
> > > > 6
> > > > >read. this is the
> > > > >section on mine that went wrong. On two VCO's.
> > > > >
> > > > >For a first project you are doing well mate.
> >Catch
> > > > you
> > > > >soon
> > > > >Kris
> > > > >
> > > > >
> > > > > >From: ganesha <goaqihai@...>
> > > > > >Reply-To: ElektorFormant@yahoogroups.com
> > > > > >To: ElektorFormant@yahoogroups.com
> > > > > >Subject: RE: [ElektorFormant] problem with
> > > > formant
> > > > >pro vco (new design)
> > > > > >Date: Sun, 9 Apr 2006 14:49:13 +0100 (BST)
> > > > > >
> > > > > >Hello Kris,
> > > > > >I live in Belgium, My english is ok ( I hope
> >;-))
> > > > But
> > > > > >I don't have much experience with
>electronics.
> > > > This
> > > > >is
> > > > > >my first project. I managed to build the
> > > > powersupply
> > > > > >and the tuningkeyboard (this is the small
> > > > schematic
> > > > > >with the 5 switches that produce 0v,1v,2v,3v
> > > > and4v to
> > > > > >act as a CV source to tune the VCO.
>=schematic
> > > > 3.11
> > > > >in
> > > > > >the book) from the book and they both work.
> > > > > >Btw, the R1 value I changed was for the
> > > > > >tuningkeyboard, not for the vco. On the vco
> >I've
> > > > used
> > > > > >everything like specified in the
>componentslist
> > > > that
> > > > > >is in the jpg at
> > > > > >http://www.krinkel.be/formant/formantVCO.JPG
> > > > > >
> > > > > >I'll try to do the test what you describe.
>For
> > > > the
> > > > > >other questions:
> > > > > >
> > > > > >At the moment I'm only building 1 vco, but I
> >plan
> > > > to
> > > > > >add some as soon as I get this one to work. I
> > > > also
> > > > > >want to build the vco of the ems VCS3etc. I
> >also
> > > > > >started the VCF but it is not finished yet.
> > > > > >I bought the pcb + all the components from a
> >guy
> > > > in
> > > > > >germany. When you say only 3 out of 5 CA3086
> >ic's
> > > > > >worked, are you sure they got enought
>voltage?
> > > > >because
> > > > > >one of the test in the book is to plug it in
> >for
> > > > > >20mins
> > > > > >to let it warm up, and then at the collector
> >from
> > > > tr4
> > > > > >you have to measure 1.6V to activate the
> >CA3086.
> > > > But
> > > > >I
> > > > > >read on the internet someone who had to set
>it
> > > > to2.4V
> > > > > >before it worked so this could be what
>happened
> > > > with
> > > > > >the 2 non-working ic's you had. (I'm only
> > > > guessing
> > > > > >this offcourse)
> > > > > >
> > > > > >The cv comes from the schematic 3.11 in the
> >book.
> > > > > >
> > > > > >I don't have skype yet but I'm sure I can
> >install
> > > > it
> > > > > >by  thursday  so that would be great.
> > > > > >
> > > > > >Thanks!
> > > > > >regards, Kris
> > > > > >--- Kris Bishop <bishopkris40@...>
> >wrote:
> > > > > >
> > > > > >
> > > > > >---------------------------------
> > > > > >I live in Scotland and have the strangest
>name,
> > > > > >everyone asks where it is
> > > > > >from. Can you imagine how strange this is lol
> > > > > >
> > > > > >Kris, First how good is your english
> > > > > >second how good is your understanding of the
> > > > > >electronics in this synth?
> > > > > >
> > > >
> > >=== message truncated ===
> > >
> > >
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> >
> >
> >
> >
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