Search found 130 matches

by analogon
Mon Jan 03, 2011 7:53 pm
Forum: BatchPCB
Topic: Unfinished PCBs
Replies: 18
Views: 4347

Re: Unfinished PCBs

I am pleased, as I am sure that most others are, to hear that. Thanks.
by analogon
Mon Dec 06, 2010 12:44 am
Forum: BatchPCB
Topic: Outline cut?
Replies: 10
Views: 2252

Re: Outline cut?

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.
by analogon
Sun Dec 05, 2010 10:38 am
Forum: SparkFun Product Questions
Topic: Double check my circuit is wired safely
Replies: 11
Views: 1346

Re: Double check my circuit is wired safely

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...
by analogon
Sat Dec 04, 2010 5:26 pm
Forum: BatchPCB
Topic: Outline cut?
Replies: 10
Views: 2252

Re: Outline cut?

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...
by analogon
Sat Dec 04, 2010 10:06 am
Forum: SparkFun Product Questions
Topic: Double check my circuit is wired safely
Replies: 11
Views: 1346

Re: Double check my circuit is wired safely

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...
by analogon
Mon Nov 22, 2010 1:45 pm
Forum: BatchPCB
Topic: Drill rules --
Replies: 1
Views: 871

Re: Drill rules --

You do not need a ring if you make the hole a mounting hole.
by analogon
Tue Nov 16, 2010 2:58 pm
Forum: PCB Design Questions
Topic: TO-220 case violates DRU?
Replies: 5
Views: 1263

Re: TO-220 case violates DRU?

Yes. I was unaware of a 5-pin TO-220.
by analogon
Tue Nov 16, 2010 9:29 am
Forum: PCB Design Questions
Topic: TO-220 case violates DRU?
Replies: 5
Views: 1263

Re: TO-220 case violates DRU?

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 ...
by analogon
Mon Nov 15, 2010 8:28 pm
Forum: PCB Design Questions
Topic: First PCB Ever - Criticism Welcome
Replies: 15
Views: 2126

Re: First PCB Ever - Criticism Welcome

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 ...
by analogon
Mon Nov 15, 2010 12:55 pm
Forum: PCB Design Questions
Topic: First PCB Ever - Criticism Welcome
Replies: 15
Views: 2126

Re: First PCB Ever - Criticism Welcome

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...
by analogon
Sun Nov 14, 2010 7:56 pm
Forum: SparkFun Product Questions
Topic: Speed of a moving table.
Replies: 8
Views: 794

Re: Speed of a moving table.

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.
by analogon
Sun Nov 14, 2010 6:30 pm
Forum: SparkFun Product Questions
Topic: Speed of a moving table.
Replies: 8
Views: 794

Re: Speed of a moving table.

How fast is your table? About 1 RPM? about 5000 RPM?
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: 1324

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

If you order 2, you will typically get 4.
by analogon
Fri Nov 12, 2010 4:19 pm
Forum: SparkFun Product Questions
Topic: What is uA?
Replies: 8
Views: 1032

Re: What is uA?

uA is microamp. The 'u' is commonly used when the mu character μ is not handy.
by analogon
Mon Nov 08, 2010 9:12 pm
Forum: BatchPCB
Topic: Dimension layer overriden by silkscreen ?
Replies: 4
Views: 1304

Re: Dimension layer overriden by silkscreen ?

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.