and the oscillator also clocks the switches that connect the bank of
caps, which controls the frequency of the filter. so your filter is
working, but you just can't change the frequency because the oscillator
isn't working.
i have one other customer with a kit with this problem, too, so i'll
try my best tonight to figure out what is probably plaguing us all :)
cheers,
Scott Deyo
The Bridechamber
contact@...
www.bridechamber.com
caps, which controls the frequency of the filter. so your filter is
working, but you just can't change the frequency because the oscillator
isn't working.
i have one other customer with a kit with this problem, too, so i'll
try my best tonight to figure out what is probably plaguing us all :)
cheers,
Scott Deyo
The Bridechamber
contact@...
www.bridechamber.com
On Apr 4, 2007, at 12:23 PM, timothy cooper wrote:
> Well, the frequency controls control the frequency of the internal
> oscillator which is used to "excite" the signal. If you go to Mr.
> Deyo's website: www.bridechamber.com he has a schematic from
> electronotes posted that pumps up the oscillator signal to usable
> levels outside of the filter section and even shapes it into a square
> and saw wave! Aside from that, Im quite a novice myself so can't
> really help out too much more.
> Ti_.
>
> casperelectronics <pete@...> wrote: Hey Ryk,
> Thanks for the info. I wish I could help you with your networking
> issues :(
> I've done most of the things you suggested...I've made the transistor
> direction mistake a few times.. I know what you mean about the
> drawing.
> The first thing I have to try is testing the output of the 3140.
> My understanding of this circuit is that I should be able to get it
> to function as a filter OR as an oscillator. Is the oscillator the
> filter with high resonance?
>
> What are the frequency controls supposed to do??
> -pete
>
> On Apr 4, 2007, at 10:18 AM, Rykhaard D.A.M.I.A.N. wrote:
>
> > Take an oscilloscope probe or digital multimeter, and touch the
> output
> > pin of the CA3140, to see whether you see the roughly 5 volt
> sawtooth
> > or 5V AC signal (on the DMM).
> >
> > If you don't, your problem COULD possibly be the 2N jfet transistor
> > not seated in the correct polarity. Though it may LOOK correct from
> > the top down, it could possibly be 180 degrees out. Find a pinout
> for
> > that tranny, showing the Gate, Source and Drain leg #'s and whether
> > they're shown in the diagram from the TOP DOWN or from the BOTTOM
> UP.
> > I have made this mistake a couple of times over the years. :)
> >
> > There is also a modification that Ken lists on the related webpage
> for
> > the VCO output TO the Clock that is driving the VCF portion. I had
> to
> > do this, on my 1st of 2 BiNTic modules. (I haven't completed the 2nd
> > one yet.)
> >
> > Also - building the BiNTic STOCK, you wont be able to have a
> separate
> > VCO output, from the VCF. The VCO is hardwired to the VCF's clock
> > control. (Which controls the timing of the 4051 muxes, for switching
> > the capacitors.) I'm doing a modification to the board to buffer the
> > VCO output as well as bring it (Sawtooth) and 2 separate Pulse Wave
> > with Pulse Wave Modulation outputs, to the front panel, along with a
> > Clock Input jack.
> >
> > You'd said that the Bandwidth and Damper controls are working. Your
> > VCO probably IS working, as it's switching the clock. With the
> > Frequency controls not working though, check all of your solder
> points
> > around the dual opamp summer for the CV Inputs (which includes the
> > Frequency controls.) Check with a multimeter in continuity, whether
> > the traces conduct, all the way through the IC sockets, to the
> actual
> > IC legs. Quite often, I myself have found legs unsoldered. :)
> >
> > Hope this helps for both of you. :)
> >
> > (Back to lurking. Trying to figure out how I screwed up my Internet
> > connection on my old computer, when I was trying to network my new
> > computer with it. :( Don't know when I'll be back on for sure.
> > (Wishing I had the Networking For Dummies book. :O :) )
> >
> > --
> > Take care,
> > Warmth and Peace,
> > Ryk
> >
> > http://www.sdiy.org/damian/index.html
> >
> >
>
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>
>
>
>
>
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