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Homebrew Equipment A place to show, design and discuss the weird and wonderful electronic creations from the hands of individual members. |
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9th Feb 2020, 2:02 pm | #1 |
Heptode
Join Date: Jan 2008
Location: Sheffield, South Yorkshire, UK.
Posts: 655
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Stripboard warning
I started a little prototype on stripboard this morning, (toneburst generator), and had tacked one leg of each of two sockets used. I started to finish soldering the other legs and noticed the stripboard hadn't been completely etched, causing tracks to be shorted. I've used stripboard for about 50 years and never seen this. I couldn't say who the supplier was as this piece has been in a drawer for years. I'm just glad I didn't get too far before I noticed!
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Martin BVWS member GQRP Club |
9th Feb 2020, 2:21 pm | #2 |
Nonode
Join Date: May 2004
Location: Halifax, West Yorkshire, UK.
Posts: 2,587
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Re: Stripboard warning
Good job you spotted the problem. The copper strips seem to be very close together compared with most I've seen. Not at all well made and something to watch out for.
Alan |
9th Feb 2020, 2:27 pm | #3 |
Nonode
Join Date: Jun 2016
Location: Bognor Regis, West Sussex, UK.
Posts: 2,296
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Re: Stripboard warning
Looks like it has been milled rather than etched.
Peter |
9th Feb 2020, 2:28 pm | #4 |
Heptode
Join Date: Apr 2011
Location: Gosport, Hampshire, UK.
Posts: 605
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Re: Stripboard warning
I had some recently where the holes were all at the right pitch and diameter but not central on the copper strip. Couldn't use it.
John
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9th Feb 2020, 3:18 pm | #5 |
Octode
Join Date: Dec 2017
Location: Morden, Surrey, UK.
Posts: 1,557
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Re: Stripboard warning
I think stripboard is normally machined rather than etched - certainly considerable variation in quality though.
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9th Feb 2020, 3:39 pm | #6 |
Heptode
Join Date: Oct 2015
Location: Gloucestershire, UK.
Posts: 719
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Re: Stripboard warning
Yes, I had the same thing, across the power rails!
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9th Feb 2020, 3:55 pm | #7 |
Heptode
Join Date: Dec 2014
Location: Lincoln, Lincolnshire, UK.
Posts: 583
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Re: Stripboard warning
I have some old stuff I have had for years that is pretty poor quality (board material and tracks). I have found that, over the years, the copper tarnishes or otherwise degrades too so soldering becomes more of a problem. Recent buys have been far better although I have noticed sometimes that the first hole at the beginning of a strip may be offset (I buy in long lengths and score and split).
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9th Feb 2020, 5:46 pm | #8 |
Dekatron
Join Date: Jun 2016
Location: London, UK.
Posts: 3,687
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Re: Stripboard warning
They sell some decent stuff at RS from Roth. It's properly etched, tinned and drilled on FR4 board.
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9th Feb 2020, 6:53 pm | #9 |
Rest in Peace
Join Date: Mar 2006
Location: N.W. Oxfordshire(Chipping Norton)
Posts: 7,306
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Re: Stripboard warning
The best stripboard was always either 'Veroboard' or the RS Variety
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9th Feb 2020, 8:33 pm | #10 |
Pentode
Join Date: Nov 2015
Location: Maidstone, Kent, UK.
Posts: 131
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Re: Stripboard warning
I have found this quite often on cheap boards from China, no surprise there, but then you get what you pay for! The other common problem is holes drilled out of line almost cutting tracks in two. The moral appears to be inspect thoroughly before starting assembly. I seem to average about a 40% yield but its still cost effective.
Orakle42 |
9th Feb 2020, 10:30 pm | #11 |
Dekatron
Join Date: Jan 2004
Location: Newcastle upon Tyne, Tyne & Wear, UK.
Posts: 8,194
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Re: Stripboard warning
Hi, I've also had this problem on custom, professional, PCB's for power supplies many years ago.
The raw board had been coated in low purity copper and had not etched evenly/ been properly inspected. Known as "measles" in the trade, tiny copper spots and some conductivity across the laminate. Ed |
9th Feb 2020, 10:39 pm | #12 |
Nonode
Join Date: Jun 2013
Location: Surbiton, SW London, UK.
Posts: 2,801
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Re: Stripboard warning
After Vero's patent expired various ersatz versions were made, even Farnell sold them.
Some had hole misalignment with a very brittle srbp. I bought a load of the blue fibreglass Vero at a rally which is perfect. Vero even made a version with a ground plane on one side. |
10th Feb 2020, 9:45 am | #13 |
Dekatron
Join Date: Jun 2009
Location: Staffordshire Moorlands, UK.
Posts: 5,271
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Re: Stripboard warning
I had some a few years ago from a local electronics shop, now defunct. It also had shorted strips, definitely an etched board as the copper shorts looked like a web that hadn't dissolved properly.
Some of the tinned, and expensive board sold by Farnell from a french manufacturer has the offset hole problem, it's been reported on the product review section by a user. I'm pretty sure some of the electronics hobby suppliers used to sell a sanding block designed for bare copper veroboard. If I'm not using tinned stuff, I always go over it with some fine wet & dry first. Makes soldering so much easier.
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Kevin |
10th Feb 2020, 10:28 am | #14 |
Dekatron
Join Date: Jun 2016
Location: London, UK.
Posts: 3,687
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Re: Stripboard warning
This is the stuff I buy which I mentioned earlier: https://uk.rs-online.com/web/p/stripboards/5185932/
Very very good quality stuff. Typical output (audio filter I built): I won't go back to the brown FR2 stuff now. It's horrid! Even the good stuff! |
10th Feb 2020, 10:43 am | #15 |
Heptode
Join Date: Oct 2015
Location: Gloucestershire, UK.
Posts: 719
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Re: Stripboard warning
A problem I have had twice is the rails not breaking completely when drilled. It is likely that I need to choose a different bit, but these two faults could not be seen, even with a magnifier. It was the meter that found it in the end.
I spent an hour building a mic pre-amp last night and 2 hours fault finding. |
10th Feb 2020, 11:15 am | #16 | |
Dekatron
Join Date: Jun 2015
Location: Biggin Hill, London, UK.
Posts: 5,208
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Re: Stripboard warning
Quote:
Like you I'd not go back to SRBP stripboard having used this one. |
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14th Feb 2020, 12:43 am | #17 |
Octode
Join Date: May 2007
Location: Liss, Hampshire, UK.
Posts: 1,873
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Re: Stripboard warning
As I understand it, you're supposed to use the special hand cutting tool to break the tracks although I expect most of us have used a drill when the right tool wasn't to hand. As far as I remember, the cutting tool has a shallower profile which means you remove less of the substrate when cutting a track.
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14th Feb 2020, 1:03 am | #18 |
Dekatron
Join Date: Jun 2009
Location: Staffordshire Moorlands, UK.
Posts: 5,271
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Re: Stripboard warning
the proper tool has a little pilot spike that goes through the hole. The one I bought from either cpc or rapid looks like a drill with a plastic handle.
Leaving a strand of copper is user error mind you, not the board's fault!
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Kevin |
14th Feb 2020, 1:04 am | #19 |
Dekatron
Join Date: Jun 2016
Location: London, UK.
Posts: 3,687
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Re: Stripboard warning
I don't use the official cutting tool or drill bits even though I own both. They are terribly unreliable. Better to nick out a section either side of a hole with a scalpel then buzz it out with a DMM.
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14th Feb 2020, 10:00 pm | #20 |
Dekatron
Join Date: Feb 2007
Location: Leominster, Herefordshire, UK.
Posts: 16,535
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Re: Stripboard warning
Not sure about that. The Vero "spot face cutters" I remember didn't but neither did they look like drill bits in a handle. The earlier ones looked a lot better but either type worked OK. The tool I had with the pilot pin would leave an isolated pad round the hole in strip board track but was ISTR intended for use on unetched single sided copperclad board with just a tenth inch grid of punched holes wherever you wanted an isolated pad to fix component legs to. Great stuff for breadboarding with a groundplane.
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