Elektor Formant Modular

****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 ===
> >
> >
> >Send instant messages to your online friends
>http://uk.messenger.yahoo.com
>
>
>
>
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