Moderators: Dave Moll, Andrew Davie, Steve Anderson
Steve Anderson wrote:Gents,
I have created a sample disc drawing in AutoCad, this is accurate as you could ever wish, however you need AutoCad to print it. There is an 'Export' function to save as BMP etc., but the resoultion is limited to ones screen settings. Frankly useless. See attached. (The slightly elliptical shape is again from the screen settings I use, the final output is spot-on).
The problem is AutoCad costs at least US$3,500, and that was the last time I checked a few years ago. I'm sure in the past I have done hi-res exports, I'll keep playing with it.
Steve A.
Steve Anderson wrote:Gary,
If you (or anyone else) is armed with printing software for AutoCad .dwg files I'm quite happy to do them to order. It's really simple for me, I've been using AutoCad since the early 80s.
All I need is the crucial data, no. of holes, single or multi spiral, and preferably the outside diameter of where line 1 sits (the most furthest from the centre). And the spacing from line-to-line.
Sync holes can be added too, I just need the same data as above. All I ask is please keep it Metric!
Steve A.
However, I am sure others would be pleased to avail themselves of your offer, it seems that if you could produce a few templates the free software mentioned should allow scaling to give any size they could want.
Steve Anderson wrote:However, I am sure others would be pleased to avail themselves of your offer, it seems that if you could produce a few templates the free software mentioned should allow scaling to give any size they could want.
I'm quite happy to do it, but I feel it's better to do each variation as a seperate identity as scaling things introduces truncation and rounding errors.
Printing at 1=1 is also the best, that way the final print should be exactly correct, even on the cheapest of printers.
Steve A.
Steve Anderson wrote:Gary,
AutoCad has come a long way since then, it still supports lisp files, but there's hardly any need for them now. Just have a look at the Autodesk website and you'll see what I mean.
I'm using AutoCad 2008, but I'm not saying how I got it...
Steve A.
Steve Anderson wrote:Gary,
It would appear that Houston Instuments got swallowed by Calcomp, you might find drivers here that should work with later versions of Windoze..
http://www.calgraphinc.com/Support/Drivers.html
Steve A.
aa9dt wrote:In normal operation, the user adjusts the CD player's volume control for best output.
Klaas Robers wrote:Of course the cicuit starts saturating when the current becomes more than the collector resistor allows. It is not bad that it is non lineair. The non linearity gives some form of gamma correction. I don't know in how far the shape resembles the gamma curve, i.e. a parabola form. This depends heavily on the parasitic serial resistance of the LED. Not impossible that in certain cases it is to too bad.
Of course a gain control pot at the input is needed and the absence of DC restoration is a pitty. An extra transistor could help here, but then the circuit is going to grow towards the less simple circuits.
Jim, why can I not access the page that you mentioned above?
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