Open Source Ecology Solenoid Driver Etching, 6 Dec 2011

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From YouTube: Surface mount part 3

Description

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A

Okay, okay, so the next part is populating the boards once we have them printed. So we got your copper, clad, clad boards that are then printed populate them with components. The surface mount components, drill holes tell me so you've done now how many of the boards like five or so uh-huh and then two of ours that you did for us. They worked. So that's great. Did you have difficulties in doing that? The soldering like from the first instructional videos that you did.

B

I mean it's, you know it's a lot slower at the beginning and you make a few mistakes but his practice, like anything.

A

Else so we practice a little bit and then the two boards that you did make they worked, so that was pretty good yeah. Okay, so tell us how you how you do that from the etch the board, so.

B

The drilling you got it, you gotta, get a really small drill bit number 58, it's not going to be in the regular drill bit section, don't to be in the wire hole, drilling thing. Okay, then where'd.

A

You get this one.

B

I gotta ace hardware, a squad work it let's go section of small bits mhm and, and so I just eyeballed with the drill press, I just have a little drill press. You know line it up figure, it is turn it on and come down drill a hole. Turn it off figure out where my next rule is going to be used to move down. A line of all the holes was.

A

That challenge, because you have that whole header of pins, was that difficult to get all in this correct, spacing yeah.

B

It is kind I mean just yet. You got to take your time because it is kind of hard to because your eyeball in it there's no way to really but.

A

At least you have the markings from the etching, so that's that's a good start. Mm-Hmm. Okay, we'll see how that goes in practice. So then, what about the components and.

B

Then okay, so I like to start off with small stuff. She, our sister, we're going to LEDs MOSFETs and save the headers for laughs, switch and.

A

You want to do the small ones too, because they're not in a way the headers would be in the way after you did it. First all right, I.

B

Supposed to make sure, what's not going to get in the way kind of deal, mm-hmm just a you know typical surface about soldering. You know get some tweezers one thing about the board: if there is a place where you know we're talking about fetching, didn't get all the way you just take some you clean up and clean up. If there's like a knife or something cut off extra copper, if there's something wrong with it, that's happened. It's just you know. It's real small it'll make a bridge between two closed places: mmhmm yeah, so.

A

You just did it with tweezers, so you did use a pair of helping hands and what mechanism is the Jews to hold the board in place? I kind.

B

A

B

You can tape it down on one side, just keep it steady good for all it like the resistors I. Just most of it. I just used tweezers mm-hmm. You know y'all feel like we'll come over and kind of stuff get.

A

Them all, how do you want.

B

B

Put the mosfets drill bit bigger, so I, just kind of hold it just kind of I'll. Do one side of the MOSFET I'll push down and do the other side? You know it's a little bigger, so you can handle it and for.

A

The resistors, you do one side first and then the other side, and you do the solder. The flux to begin with at a flux, pen or something I got.

B

Just a big jug of flux and umbrella, so you use a brush and okay canst yep.

A

So flux my brush.

B

A

The brush the cheers like this: yes.

B

Gasps there I had a you for plumbing flux, but is.

A

That still good, or did it dry up.

B

At it dries up, I just just get it really matter. You just get it on there. Uh-Huh.

A

Okay, all right, so anything else would let's move on to the actual. What else any.

B

Hope to like ease this clamp that I'm doing the terminal for the you know. We call the terminal yeah.

A

The screw down terminals.

B

Yeah, I kinda I'll set the board in here kind of clamp it down. It's good, it's kind of hard to do the terminals on the surface. This, because.

A

B

Supposed to be through hole, but we don't have that so we're just kind of like shooting the gap in between the bottom of it. In the surface, wait.

A

So the the screw down terminals- you, you solder them from the back side or from the underside from.

B

On to the top of the board onto.

A

The top of the board in between the but the terminal is in the way, so I guess we'll see that later how it's.

B

Done: okay, yeah, so I have this like an angle, it's easy and then.

A

You punch it down or no you, you press it all the way down. You press the screw terminal down all the way, and then you get now this sort of not.

B

All the way, little gap just enough to get your solder in soldering iron in there uh-huh and.

A

You solder it in and then you press it down or no. No, that's just yeah.

B

A

A

Alright, so let's get to the build.