mini-podule pin headers

Arc/RPCs, peripherals, RISCOS operating system & ARM kit eg GP2x, BeagleBoard
Post Reply
User avatar
IanS
Posts: 621
Joined: Mon Aug 31, 2009 6:02 pm
Contact:

mini-podule pin headers

Post by IanS » Sun Mar 25, 2018 2:13 pm

Following on from my success building an A30x0 IDE podule - viewtopic.php?f=41&t=5594&p=198367#p198367 , I'm looking for the correct pin headers.
Does anyone know where to get the tall headers suitable for a mini-podule. Looks to be ~15mm between the plastic spacers, .1" pitch, 17-pins (I don't need the 5-way headers).

I'm currently using a couple of "extensions" (see pic), but it's not ideal.
IMG_20180324_152847115_HDR.jpg

stevebubs
Posts: 17
Joined: Thu Mar 09, 2017 1:01 am
Location: Berks
Contact:

Re: mini-podule pin headers

Post by stevebubs » Mon Mar 26, 2018 1:29 pm

Ian,

Have a look here and see if you can find what you want...

https://www.samtec.com/connectors/stand ... d-to-board

Does this now mean you can manufacture IDE boards at will?

Steve


stevebubs
Posts: 17
Joined: Thu Mar 09, 2017 1:01 am
Location: Berks
Contact:

Re: mini-podule pin headers

Post by stevebubs » Mon Mar 26, 2018 1:35 pm


User avatar
IanS
Posts: 621
Joined: Mon Aug 31, 2009 6:02 pm
Contact:

Re: mini-podule pin headers

Post by IanS » Mon Mar 26, 2018 8:26 pm

stevebubs wrote:Does this now mean you can manufacture IDE boards at will?
Possibly. The A30x0/A4000 8-bit card is working very well, it has the series resistors. The standard podule version (without resistors) is currently very picky about which devices it will work with.

I'm going to wire up a set of series resistors to a standard podule version some time this week, to check that it makes the difference, then probably get some more PCB's made.

User avatar
IanS
Posts: 621
Joined: Mon Aug 31, 2009 6:02 pm
Contact:

Re: mini-podule pin headers

Post by IanS » Mon Mar 26, 2018 8:31 pm

I can't quite see a suitable candidate, from the spec sheet https://www.toby.co.uk/uploads/publications/1326.pdf
I think I'm looking for EW-17-??-S-600
EW with Tail
17 - pins (loger could be cut down.
S- Single Row
600 - (6*.1, 6*2.54 = 15.24mm) height.

Can you see anything suitable?

They also look quite expensive, I think I can use standard header pins and make "extensions", and still be cheaper.

User avatar
IanS
Posts: 621
Joined: Mon Aug 31, 2009 6:02 pm
Contact:

Re: mini-podule pin headers

Post by IanS » Mon Mar 26, 2018 9:12 pm

Does anyone know what the official height should be?
In the podule spec - http://www.chiark.greenend.org.uk/~theo ... xpspec.pdf it refers to -
The physical dimensions and component clearance
dimensions of the mini expansion card are specified in
the drawing called the Mini Expansion Upgrade,
(0280,080). An EMC gasket to drawing 0294,081 is also
required on A3010 and A3020 machines to maintain
EMC performance when a mini expansion card is fitted
Does anyone have either of those documents?

steve3000
Posts: 1872
Joined: Sun Nov 25, 2012 12:43 am
Contact:

Re: mini-podule pin headers

Post by steve3000 » Tue Mar 27, 2018 10:15 pm

Have you got the A3000 TRM?

I'm sure there's a diagram in there showing the internal expansion dimensions, along with the circuit and layout of the internal User port/MIDI podule?

If you don't have this, I can dig this out and post a picture when I'm home on Friday.

User avatar
IanS
Posts: 621
Joined: Mon Aug 31, 2009 6:02 pm
Contact:

Re: mini-podule pin headers

Post by IanS » Tue Mar 27, 2018 10:30 pm

steve3000 wrote:Have you got the A3000 TRM?

I'm sure there's a diagram in there showing the internal expansion dimensions, along with the circuit and layout of the internal User port/MIDI podule?
Ah ha, I had a zip of the diagrams from the A3K TRM, it wan't in there.

But you are right, it is in the TRM, page 35 - http://chrisacorns.computinghistory.org ... 000TRM.pdf

Looks like the pins can be a max of 23mm. Still need to find something suitable.

Thanks.

crj
Posts: 834
Joined: Thu May 02, 2013 4:58 pm
Contact:

Re: mini-podule pin headers

Post by crj » Tue Mar 27, 2018 11:51 pm

That diagram suggests firstly that the board to board spacing is 23mm and secondly that the pins can be up to 23mm long. Either there's an inconsistency or they've used a fairly unusual design of receptacle...

This isn't ideal, because it's only 8 conductors, but it does have the merit of existing...

User avatar
IanS
Posts: 621
Joined: Mon Aug 31, 2009 6:02 pm
Contact:

Re: mini-podule pin headers

Post by IanS » Wed Mar 28, 2018 7:50 am

crj wrote:That diagram suggests firstly that the board to board spacing is 23mm and secondly that the pins can be up to 23mm long. Either there's an inconsistency or they've used a fairly unusual design of receptacle...

This isn't ideal, because it's only 8 conductors, but it does have the merit of existing...
The diagram shows board-to-board of 23.5mm, with max length of pin below upgrade board as 23mm, not a lot of wiggle room.

I'm going to give a couple of these a try, next time I order from bitsbox. They look about right, I can snap 3 pins off.
https://www.bitsbox.co.uk/index.php?mai ... ts_id=2521

crj
Posts: 834
Joined: Thu May 02, 2013 4:58 pm
Contact:

Re: mini-podule pin headers

Post by crj » Wed Mar 28, 2018 12:05 pm

But those are 25.7mm long, PCB to tip. Surely something a millimetre or two shorter is fine, but a millimetre or two longer is a problem?

User avatar
IanS
Posts: 621
Joined: Mon Aug 31, 2009 6:02 pm
Contact:

Re: mini-podule pin headers

Post by IanS » Wed Mar 28, 2018 12:55 pm

crj wrote:But those are 25.7mm long, PCB to tip. Surely something a millimetre or two shorter is fine, but a millimetre or two longer is a problem?
Things that are too long can be shortened, difficult to make things longer.
I'm going to try careful use of a vice to slide the top plastic spacer down a few mm so the pins stick out above the PCB a bit further. No idea if it will work, but it's worth a try.

crj
Posts: 834
Joined: Thu May 02, 2013 4:58 pm
Contact:

Re: mini-podule pin headers

Post by crj » Wed Mar 28, 2018 3:30 pm

Fair enough, I guess. I assume this is a one-off? That doesn't sound like the kind of thing to make a habit of attempting!

The one I linked to, by the way, has a board-to-pin-tip length of 21mm, which sounds very nearly ideal to me. The contact area in the mainboard connectors is going to be a lot more than 2mm, and it's not like you care about the pins' ability to carry a current of several amps.

User avatar
IanS
Posts: 621
Joined: Mon Aug 31, 2009 6:02 pm
Contact:

Re: mini-podule pin headers

Post by IanS » Wed Mar 28, 2018 4:36 pm

crj wrote:Fair enough, I guess. I assume this is a one-off? That doesn't sound like the kind of thing to make a habit of attempting!

The one I linked to, by the way, has a board-to-pin-tip length of 21mm, which sounds very nearly ideal to me. The contact area in the mainboard connectors is going to be a lot more than 2mm, and it's not like you care about the pins' ability to carry a current of several amps.
Really, if it works, I can probably get a couple of spacers that allow me to just put the headers in the vice and squeze until it hits the end. Probably a few seconds per set.
Sounds easier than trying to get 6 sets of 8 pins or less lined up accurately.

User avatar
1024MAK
Posts: 7624
Joined: Mon Apr 18, 2011 4:46 pm
Location: Looking forward to summer in Somerset, UK...
Contact:

Re: mini-podule pin headers

Post by 1024MAK » Wed Mar 28, 2018 6:08 pm

Last year I picked some of these up at a radio rally:-
IMG_6666.JPG
29mm long, 0.1" pin header
They are 29mm long, 0.1" pin headers.

Alas, I don't remember any details of the seller, so apart from trying to find some at another radio rally, I can't help with a supplier.

Mark
For a "Complete BBC Games Archive" visit www.bbcmicro.co.uk NOW!
BeebWiki‬ - for answers to many questions...

User avatar
tnt23
Posts: 34
Joined: Thu Jul 16, 2015 8:24 am
Location: Saint Petersburg, Russia
Contact:

Re: mini-podule pin headers

Post by tnt23 » Wed Mar 28, 2018 7:27 pm

Check these:

"3M 929, 2.54mm Pitch, 36 Way, 1 Row, Straight Pin Header, Through Hole"

https://uk.rs-online.com/web/p/pcb-headers/8277570/

Image
Regards, Tim

User avatar
IanS
Posts: 621
Joined: Mon Aug 31, 2009 6:02 pm
Contact:

Re: mini-podule pin headers

Post by IanS » Wed Mar 28, 2018 7:35 pm

tnt23 wrote:Check these:

"3M 929, 2.54mm Pitch, 36 Way, 1 Row, Straight Pin Header, Through Hole"

https://uk.rs-online.com/web/p/pcb-headers/8277570/

Image
Available to back order for despatch 19/04/2018
In a Pack of 300
Per Pack* £543.30
Thanks. I only want 10, are you offering to buy the other 290?

User avatar
tnt23
Posts: 34
Joined: Thu Jul 16, 2015 8:24 am
Location: Saint Petersburg, Russia
Contact:

Re: mini-podule pin headers

Post by tnt23 » Thu Mar 29, 2018 9:14 am

Sorry, did not pay attention to MOQ. I am not selling these :)

Farnell UK might have them though - http://uk.farnell.com/w/c/connectors/bo ... 929-series
Regards, Tim

User avatar
IanS
Posts: 621
Joined: Mon Aug 31, 2009 6:02 pm
Contact:

Re: mini-podule pin headers

Post by IanS » Fri Mar 30, 2018 11:50 am

IanS wrote:I'm going to wire up a set of series resistors to a standard podule version some time this week, to check that it makes the difference, then probably get some more PCB's made.
I'd been putting off doing this as it seemed a tedious and error-prone task, wiring up lots of resistors.
I then realised I can use one of the 8-bit podule PCB's to hold the resistors and IDE connector. I'd just need to wire up the input cable. Or I could use another PCB with the resistors replaced with links and join them together.
IMG_20180330_121206291.jpg
IMG_20180330_121308119_HDR.jpg
IMG_20180330_121400295_HDR.jpg
(so that's two 8-bit interface PCB's that are unlikly to ever be used for their original purpose)

The effect is magical. Everything now works.
I don't have a big list of devices to try, but so far I've tried:-
1/2/4GB CF cards (a few different manufacturers)
200MB DOM
CF to SD card adapter.
100MB Conner HD.

So I'll be spending the rest of the weekend laying out a new 16-bit IDE podule with resistors on-board.

User avatar
IanS
Posts: 621
Joined: Mon Aug 31, 2009 6:02 pm
Contact:

Re: mini-podule pin headers

Post by IanS » Sun Apr 08, 2018 5:19 pm

IanS wrote:I'm going to give a couple of these a try, next time I order from bitsbox. They look about right, I can snap 3 pins off.
https://www.bitsbox.co.uk/index.php?mai ... ts_id=2521
They actually work very well.
If you solder the "long" end into the PCB, then push the headers into a breadboard to push the plastic spacer on the "short" end up, it's pretty much spot-on.

Post Reply