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Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets.

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Old 18th Jan 2017, 2:02 pm   #1
Herald1360
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Default New use for old tech!

http://uk.rs-online.com/web/p/barrie...32333435343126

Looks like it might well have other more retro applications than the one it's marketed for.
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Old 18th Jan 2017, 2:27 pm   #2
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Default Re: New use for old tech!

That's inspired! I take my hat off to whoever thought of it, and I hope they sell lots...

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Old 18th Jan 2017, 2:37 pm   #3
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Default Re: New use for old tech!

Sign of the times- they've gone from dual-in-line to quad package....

Interesting- though how much longer will leaded components be around for them, or did the market analysis suggest plenty of NOS?
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Old 18th Jan 2017, 3:15 pm   #4
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Default Re: New use for old tech!

Those are rather good. I still like using tag strips for power supplies. Thanks for the heads up on this.
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Old 18th Jan 2017, 4:36 pm   #5
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Default Re: New use for old tech!

It appears to be rate for <=12V so not much use for valve stuff
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Old 18th Jan 2017, 6:59 pm   #6
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Default Re: New use for old tech!

I guess the voltage rating is determined by the creepage distance. I suppose punching out alternate tags would be a solution.
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Old 18th Jan 2017, 7:21 pm   #7
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Default Re: New use for old tech!

Quote:
Originally Posted by emeritus View Post
I guess the voltage rating is determined by the creepage distance. I suppose punching out alternate tags would be a solution.
You'd need to have a better understanding of the material the base is made of.

Pragmatically, punching-out intermediate tags would make the resultant inter-tag voltage rating 24V !
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Old 18th Jan 2017, 7:55 pm   #8
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Default Re: New use for old tech!

Quote:
Originally Posted by dominicbeesley View Post
It appears to be rate for <=12V so not much use for valve stuff
Seems like a rather timid case of CYA to me- what they mean is "if you use this for even 24V control gear, never mind anything higher and especially mains, then don't come crying to us when it goes wrong".
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Old 18th Jan 2017, 8:15 pm   #9
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Default Re: New use for old tech!

Quote:
Originally Posted by G6Tanuki View Post
Pragmatically, punching-out intermediate tags would make the resultant inter-tag voltage rating 24V !
Surely, punching out alternate tags would increase the distance between the remaining tags to twice the inter-tag space plus the width of the removed tag - so much more than doubling the theoretical voltage rating.

I agree that the voltage rating between alternate tags should be 24V if the intervening tags are left in place.
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Old 18th Jan 2017, 8:36 pm   #10
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Default Re: New use for old tech!

I suspect that the rating was determined simply by what they tested it with, or just enough for the Raspberry pi application.

It would have to be an amazingly fine spacing to limit it to 12v and the control of production tolerances to avoid shorts would have to be even more amazing.

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Old 18th Jan 2017, 11:42 pm   #11
emeritus
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Default Re: New use for old tech!

It says the base is SRBP and the pitch is 6mm. So about 8mm between tags if intermediates are removed, which is greater than the inter-pin spacing of many valves.
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Old 19th Jan 2017, 1:53 am   #12
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Default Re: New use for old tech!

For functional (as opposed to safety) insulation, a couple of millimetres creepage distance between tags is good for 500V. Tagstrip spacing requirements haven't recently increased
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Old 19th Jan 2017, 5:09 pm   #13
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Default Re: New use for old tech!

I like it, even if not used with a PI, having 40 tags would be good for birds nest and deadbug construction. I agree the 12 volt "limitation" is just CYA.
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Old 19th Jan 2017, 5:22 pm   #14
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Default Re: New use for old tech!

I had to look up CYA, "cover ones bottom" is my interpretation.
 
Old 19th Jan 2017, 7:20 pm   #15
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Default Re: New use for old tech!

I think this RS item is a real oddball idea!

If its real purpose is a breakout board to allow experimenters to access the 40 lines of the Raspberry Pi its a very clumsy method.

Whilst it might have mounting holes to enable it to stack it would then make access to its mother board difficult. The slot seems totally pointless, if the ribbon cable is fed up through it and then divided and wired to each of the tags the result would be a rats nest obscuring the silk screen text. Much better would be to split the cable under the tagboard and bring each wire up through the holes in the tags leaving the top surface clear.

I don't have a Pi but presumably the function of the 40 connections are known, so I wonder why did they not mark the silkscreen to identify the i/o lines etc.

I would have thought that a single side board with a footprint for the 40 way header taken out to a pattern of large plain pads that wires and components could be tacked on to would be a more practical and cost effective solution (like some 1970s prototyping boards). If money was really tight the pads would be undrilled so the PCB would only need as few as 44 holes.

That my take on it anyway.

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Old 19th Jan 2017, 7:22 pm   #16
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Default Re: New use for old tech!

Agreed. It's an awful idea for what it's intended for. I can see a million other uses though.
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Old 19th Jan 2017, 7:32 pm   #17
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Default Re: New use for old tech!

I have been meddling with electronics and prototyping things for over sixty years, I did use tagstrips a long time ago but cannot visualise using them for anything nowadays. What sort of applications can you see? (I don't think the mods would appreciate if you listed a million here!)

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Old 19th Jan 2017, 8:14 pm   #18
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Default Re: New use for old tech!

I still use the 2-rows-of-tags strips like this for a lot of 'hack' transistor-and-discrete-components things: my latest involved drilling the SRBP between the rows of tags to take a couple of NKT404 transistors as a low-power push-pull inverter.
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