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Great shades of my engineering prototype / design days with RTL-DTL-TTL-and ECL.
I still can’t zero in on which I detested the most, the mentioned strip boarding PCB’s or the small square grid format which was dependent on adjacent bridging with the use of a solder bridge for linear conductor square to square continuity…..for sure, the latter…. I certainly believe.
Engineering supply was the sourcing, with ye olde initial billing being footed by the customer. It didn’t take but a milli-micro-sec for me to see that its pricing was too steep for my personal use. Therefore, I figured that the cost / complexity of the ‘lebenteen Kajillion hole grids, was something that I could work around and made me a lithographic master photographic negative of the PCB pattern that I needed to etch.
I etched myself a supply and would then make my initial circuit layout on Engineering/math .1 inch centered graph/grid paper, as I saw where my holes were needed and then individually drilled just the holes as required, vice a Kajillion !!!
The little center etched divots help guide the micro drill bit until it takes the onset of its initial bite.
Where I had to cut a strip open, I was using a sharp #11 Exacto blade with two adjunct slits with the inner foil peeled off instead of the
MUCH wider rotary circle cutter.
I had incorporated on end connector areas such that I could cut down some boards widths and plug into Burndy–Cinch-Eby 9-10-15-22 pin card catalog connectors. In your case you might just want to lay an end conducting terminating wire down centered upon the end plane of a conductive strip and tack re-flow solder it .
I J-pegged one of my old negatives for you, should you want to use the Tom Gotee / Laser copier / Toner transfer method for its iron on deposition onto a blank PCB for the resist aspect application, with the PCB unit then being etched.
For my part, I have always had a photo darkroom and exclusively used lithographic film and made perfect negatives…thus perfect transfers..thus perfect boards.
Below is your URL for the J-peg negative….be sure to click on the right bottom corner Mag logo or the small image will have an optical pairing or skipping of lines until viewed at the higher magnification when evaluating.
On viewing the image in the print preview mode prior to a print copy, also zoom up on the image, then you can see if the print layout positioning is OK. I almost centered it up on the PDF format , but you might still have to go in the menu on your printer and tinker with the aspect ratios for super perfection. I was using a HP laser for my trials.
Image is direct URL sourced here:
http://img175.imageshack.us/img175/9843 ... peglw8.jpg
Also, an on page visual reference here:
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73's de Edd
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