PDA

View Full Version : Ffs, tag boards!!



Welder
16-11-2010, 13:38
I keep seeing tag boards and vero board in DIY stuff :eek:
I gave up on tag boards years ago. They are usually not that well made and not very convenient with regard to tag spacing.

This is what I use.

A length of 1.5mm solid core insulated copper wire (you can use whatever thickness suits the current application but too thin gets too fiddly)
As many MALE spade connectors (lucar crimp connectors) as required. This type is fine.
http://www.maplin.co.uk/Search.aspx?MenuNo=100876
Uninsulated are easier but the insulation can be twisted off if the insulated type are all you can get.
You can even get copper based instead of brass if you have a search.

Lay out the components to + and – rails and preferably make a drawing particularly if the build is complex.
Cut around the insulation (two cuts) with a hobby knife on the wire the same width as the spade where you want to make the join and strip off the insulation.
Strip off the insulation on the spade if it has it.
Using a pair of slim round nosed pliers bend the spade part so that it roughly has the same inside diameter as the wire and then fit the bent section around the wire.
(A screwdriver inserted into the spade cup makes holding the crimp terminal easier.)
Squeeze the folded spade around the wire. With a bit of practice you can get a really tight fit that surrounds about 2/3 of the wire.
Carefully apply heat to the rounded portion of the spade on the wire and apply a small amount of solder.
What you should have now is a receiver pot on a bit of wire. If you haven’t gone overboard with the soldering you should be able to open and close this “receiver pot” to grip the wire or combination of wires you intend to join up.
Do the above at every point you wish to make a component connection making sure all the little pots face the same direction, or if required, the easiest direction for a particular component link.

I much prefer tufnol board to vero board; its stronger, has better insulating capability and drills easily.
http://www.qtasystems.co.uk/crossovers.htm
To fix the wire with the pots on to the board I use two or three of the spade connectors facing into the board. Drill exactly the same size holes in the board as the outside diameter of the “pot”.
Use panhead self tapping screws from underneath the board to screw into the pot inserted into the board. If shorting is likely to be a problem then countersink the hole for the screw head.

What you should now have is a rail with all the benefits of a through soldered hole and non of the disadvantages.
Yes, it’s a bit of trouble but what you get is a strong rail with connections where you want them that are easy to fit multiple leads into if necessary (squeeze to grip before soldering) and easy to solder. :)

Techno Commander
16-11-2010, 17:15
Could you post a picture? :)

I agree with what you say about tag board. However turret boards are generally of better quality.

http://www.diyfactory.com/projects/diyla2/TurretBoardClose.jpg

Barry
16-11-2010, 17:21
Could you post a picture? :)

I agree with what you say about tag board. However turret boards are generally of better quality.

http://www.diyfactory.com/projects/diyla2/TurretBoardClose.jpg

+1, I couldn't picture what Welder was describing.

Regards

Welder
16-11-2010, 17:43
Sry guys, I don’t have a camera :scratch:
I will try to borrow one but I doubt it will be soon.
What I can do is (hopefully) draw it and post that.
If you pick up a Lucar connector in one hand and a bit of wire in the other and think to yourself, how do I join these two together so I have an open pot sticking up from the wire it should be obvious.
After that the insulation stripping, the shaping of the rail and the fixing to the board should be easy ;)

Barry
16-11-2010, 17:50
Ah, I'm starting to get the picture! ;)

So the AMP connectors replace the turret tags, providing a 'feed through' and a convenient way to accept the flat tag terminals on pots? One simply drills the insulating board: SRBP, fibreglass or Tufnol, as appropriate.

Clever idea John, and one which I might try out next time I knock up a bit of electronics.

Regards

Welder
16-11-2010, 18:09
Almost Barry ;)
I'll do a drawing :eyebrows:

Welder
17-11-2010, 14:39
Hmm, not the greatest bit of technical drawing but I hope this clears things up.
One advantage to this method is the rails can be bent to suit your layout.
If you use board thinner than the depth of the pot the best fixing method I found in this case is to countersink the hole on the underside and using a punch carefully spread the pot edge into the countersink. A bit of Araldite on top both fixes and insulates.
You also have the possibility of feeding wires through the board if required.
Anyway, give it a try. You can get a very tidy looking board doing this. It’s ideal for crossovers.

http://www.mediafire.com/imgbnc.php/040ffbe1baceeff0903ee68b4a502b3a6e8f4b5b21aa456e51 34d443676b999b2g.jpg (http://www.mediafire.com/imageview.php?quickkey=3e76rco64chvfac&thumb=5)

lurcher
17-11-2010, 14:54
Whats the point of the "component pot" why not just solder to the copper wire, seems to be adding another soldered joint for no benefit?

I agree that turrets into board (I like plain FR4 board for this) can be good. But I dont see how its any use for DIL part prototyping, which matrix board is good for (I agree that vero/stripboard is not without its problems).

And I can't see electrically what the problem with tag board/strip is.

Welder
17-11-2010, 15:21
Well, one advantage of the pot is you can crimp to the component lead. Another is that it makes multiple lead soldering easier.
There isn’t a problem with tag boads electrically but mechanically I haven’t found them that clever; tags working loose, inconvenient tag spacing, boards prone to cracking.
Turrets can be better but turret boards tend to have the same disadvantages as tag boards and the height of turrets compared to the fixing area makes them easy to dislodge if you’re a bit heavy handed. They also seem to loosen with repeated application of heat.
Sure you can fit your own turrets in a better quality board but they are after all a push fit and if you don’t press them in spot on you’ve got problems.
I didn’t post this for an argument; try it you want and find out for yourself. I happen to like this way, its solid, its neat and virtually vibration proof. It isn’t suitable for all applications but I’ve used it for final builds in amps and crossovers and it works well.