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Re: Unfinished PCBs

 by analogon ¦  Mon Jan 03, 2011 7:53 pm ¦  Forum: BatchPCB ¦  Topic: Unfinished PCBs ¦  Replies: 18 ¦  Views: 4555

I am pleased, as I am sure that most others are, to hear that. Thanks.

Re: Outline cut?

 by analogon ¦  Mon Dec 06, 2010 12:44 am ¦  Forum: BatchPCB ¦  Topic: Outline cut? ¦  Replies: 10 ¦  Views: 2297

phalanx wrote:When you run the CAM processor, your dimension layer must be processed as the top copper layer or the top silk screen layer. It needs to leave a visible line on the finished boards so they can route along it.

-Bill
No way they routinely route by eye.

Re: Double check my circuit is wired safely

 by analogon ¦  Sun Dec 05, 2010 10:38 am ¦  Forum: SparkFun Product Questions ¦  Topic: Double check my circuit is wired safely ¦  Replies: 11 ¦  Views: 1374

I don't see the need for double power switch for 120 VAC. It would not hurt however. For 240 VAC I could see an advantage. Adding resistors across the transistor's E-C pins is not an improvement. That is counterproductive. I would take those back out. What you have to ask yourself is how does curren...

Re: Outline cut?

 by analogon ¦  Sat Dec 04, 2010 5:26 pm ¦  Forum: BatchPCB ¦  Topic: Outline cut? ¦  Replies: 10 ¦  Views: 2297

They actually state that the best method is to put the outline on an outline layer or the silk screen layer, although it can be on a copper layer. They say that the dimension layer should be combined with the top copper layer, if it is used. You should have checked. I don't think so. A 0 mil outlin...

Re: Double check my circuit is wired safely

 by analogon ¦  Sat Dec 04, 2010 10:06 am ¦  Forum: SparkFun Product Questions ¦  Topic: Double check my circuit is wired safely ¦  Replies: 11 ¦  Views: 1374

Two problems come to mind. 1. I think you would have to common the emitter of transistors T1 and T2 to your Vcc of the microcontroller. I would look into opto-coupled circuits, although your method would probably work safely if there are no unexpected leakages/paths. Also note that 'T' is commonly u...

Re: Drill rules --

 by analogon ¦  Mon Nov 22, 2010 1:45 pm ¦  Forum: BatchPCB ¦  Topic: Drill rules -- ¦  Replies: 1 ¦  Views: 907

You do not need a ring if you make the hole a mounting hole.

Re: TO-220 case violates DRU?

 by analogon ¦  Tue Nov 16, 2010 2:58 pm ¦  Forum: PCB Design Questions ¦  Topic: TO-220 case violates DRU? ¦  Replies: 5 ¦  Views: 1286

Yes. I was unaware of a 5-pin TO-220.

Re: TO-220 case violates DRU?

 by analogon ¦  Tue Nov 16, 2010 9:29 am ¦  Forum: PCB Design Questions ¦  Topic: TO-220 case violates DRU? ¦  Replies: 5 ¦  Views: 1286

What is the problem? TO-220 pins are on 0.100 (100 mil) spacing. You could have a 60 mil wide pad with a 40 mil hole, and still have 40 mils spacing between pads. Or you could use 70 mil wide pads and 30 mil spacing. I would not use round pads. I would use elongated pads of some sort. Also consider ...

Re: First PCB Ever - Criticism Welcome

 by analogon ¦  Mon Nov 15, 2010 8:28 pm ¦  Forum: PCB Design Questions ¦  Topic: First PCB Ever - Criticism Welcome ¦  Replies: 15 ¦  Views: 2194

Since you are learning, I suggest you add some surface mount parts. You solder them with something called solder paste. It is not just flux. It is finely powdered solder mixed with a sticky flux. You could put surface-mount pads in parallel with some of the thru-hole parts to let you use either, or ...

Re: First PCB Ever - Criticism Welcome

 by analogon ¦  Mon Nov 15, 2010 12:55 pm ¦  Forum: PCB Design Questions ¦  Topic: First PCB Ever - Criticism Welcome ¦  Replies: 15 ¦  Views: 2194

Oh, another question: I'm using BatchPCB... all my traces and ground pour are on the bottom layer. Do I really need a top solder mask and copper layout? Understand that top silk and top copper are included in the price. It is more common to put the silk screen on the top for parts placement, rather...

Re: Speed of a moving table.

 by analogon ¦  Sun Nov 14, 2010 7:56 pm ¦  Forum: SparkFun Product Questions ¦  Topic: Speed of a moving table. ¦  Replies: 8 ¦  Views: 835

You could put a mark on the table. Count the rotations for 1 minute.

If you needed more precision or wanted to display the speed continually, you could measure the period of rotation with a debounced sensor circuit and a processor. The sensor could be mechanical, optical or magnetic.

Re: Speed of a moving table.

 by analogon ¦  Sun Nov 14, 2010 6:30 pm ¦  Forum: SparkFun Product Questions ¦  Topic: Speed of a moving table. ¦  Replies: 8 ¦  Views: 835

How fast is your table? About 1 RPM? about 5000 RPM?

Re: How many copies of your board do you typically order?

 by analogon ¦  Sat Nov 13, 2010 12:58 pm ¦  Forum: BatchPCB ¦  Topic: How many copies of your board do you typically order? ¦  Replies: 2 ¦  Views: 1350

If you order 2, you will typically get 4.

Re: What is uA?

 by analogon ¦  Fri Nov 12, 2010 4:19 pm ¦  Forum: SparkFun Product Questions ¦  Topic: What is uA? ¦  Replies: 8 ¦  Views: 1075

uA is microamp. The 'u' is commonly used when the mu character μ is not handy.

Re: Dimension layer overriden by silkscreen ?

 by analogon ¦  Mon Nov 08, 2010 9:12 pm ¦  Forum: BatchPCB ¦  Topic: Dimension layer overriden by silkscreen ? ¦  Replies: 4 ¦  Views: 1352

The best way to transmit your dimensions and shape to BatchPCB is with a shape in the top copper and/or top silk. I used a zero-width shape in the top copper.

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