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
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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