Hello from Charlottesville, VA, USA!

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colonel32
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Hello from Charlottesville, VA, USA!

Post by colonel32 » Wed Jun 13, 2018 7:49 pm

Proud owner of a new Issue 7, acquired on eBay. Apologies if I was bidding against anyone here :)

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Just waiting for my retro clinic caps to arrive, before I attempt to blow it up...

First question of many (I'm sure): I was thinking of replacing the whole mains cable with one with a moulded US plug. What spec crimp terminals do I need to look for, to attach it to the power supply?

Also, I can see the voltage doubler link in the PSU dircuit diagram, but can't identify it on the board. Has anyone got a close-up photo?

Anyway, I've been writing ZX Spectrum games for the last few years, and thoroughly enjoying getting back into low level coding, but the BBC was my first love back when I was in school. I ended up writing educational software on it to go with the textbooks one of my teachers wrote, and it set me on a long and winding path where I eventually ended up being a dev in my day job :)

Cheers!

Robin

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danielj
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Re: Hello from Charlottesville, VA, USA!

Post by danielj » Wed Jun 13, 2018 8:16 pm

Welcome! Have a look under the test label on your PSU :) - I think!

I seem to remember the mains crimps on the beeb psu are the same as the master: https://www.waitingforfriday.com/?p=794

10x Blade receptacle 6.3×0.8mm (fully insulated) – http://uk.farnell.com/amp-te-connectivi ... /dp/488306

- double check the width of the blades on the switch though. Make sure you ground it all!

:)

d.

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flaxcottage
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Re: Hello from Charlottesville, VA, USA!

Post by flaxcottage » Wed Jun 13, 2018 8:17 pm

Welcome, Robin. :D
- John
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CMcDougall
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Re: Hello from Charlottesville, VA, USA!

Post by CMcDougall » Wed Jun 13, 2018 8:21 pm

welcome Robin :)
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Multiwizard
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Re: Hello from Charlottesville, VA, USA!

Post by Multiwizard » Wed Jun 13, 2018 9:18 pm

Hi Robin,

welcome to this great Forum... :D


Greetings from my little Dutch Acorn Attic, Wim... :-)

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davidb
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Re: Hello from Charlottesville, VA, USA!

Post by davidb » Wed Jun 13, 2018 10:50 pm

Welcome! :D

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Elminster
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Re: Hello from Charlottesville, VA, USA!

Post by Elminster » Wed Jun 13, 2018 10:52 pm

Welcome. I hope to see new Beeb games soon then.

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1024MAK
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Re: Hello from Charlottesville, VA, USA!

Post by 1024MAK » Thu Jun 14, 2018 12:55 am

Hi Robin

A refugee from WoSf!

Welcome :D

Enjoy the forums and your new Beeb.

It's slightly different here compared to WoSf, but we don't bite (much)!

If you still would like a photo showing the relevant area of the PSU PCB, let me know, I have a PSU that is not in it's case, so could take some photos for you.

The spades are a standard type/size (I may have lots of them in my spares box, but I forget the size). The colour of the insulated collar indicates the size range of the copper core of the wire that it is designed to take. Red/pink for small, blue for the next size up, and yellow for the larger wires. Ideally, use good quality crimps (not any old cheap ones) and I recommend using a ratchet crimping tool rather than a glorified wire stripping/pliers type tool.

Mark

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tricky
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Re: Hello from Charlottesville, VA, USA!

Post by tricky » Thu Jun 14, 2018 3:20 am

Welcome, looking forward to what you write for the beeb. If it's assembler you might like to search here for beebasm, or start on the old home page on retro software.

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1024MAK
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Re: Hello from Charlottesville, VA, USA!

Post by 1024MAK » Thu Jun 14, 2018 1:10 pm

Beeb power supply unit photos:

The 110/120V link is on the top left in the component side photos. After fitting a plug suitable for your mains sockets, and after putting a clear label on the machine warning that it has been adjusted for use on a 110/120V AC supply, just solder a piece of solid tinned copper wire between the holes marked 115V.
IMG_7253.JPG
BBC B PSU, component side
IMG_7251.JPG
Component side showing 110/120v link after sticker removed
IMG_7254.JPG
Close-up of the link holes
IMG_7252.JPG
BBC B PSU track side (110/120V link pads are on the top right)
Mark

colonel32
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Re: Hello from Charlottesville, VA, USA!

Post by colonel32 » Thu Jun 14, 2018 2:07 pm

Thanks everybody, and particular thanks for taking time to do the pics, Mark!

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klintworth
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Re: Hello from Charlottesville, VA, USA!

Post by klintworth » Thu Jun 14, 2018 5:19 pm

We;come to this awesome group!
Here's the link I made on my power supply
link.jpg
link.jpg (31.61 KiB) Viewed 519 times
Unfortunately the power supply is not working yet - not sure why. I'm using a North American Beeb power supply with a UK series 4 motherboard at the moment. Paul
BBC B Issue 4, BBC B UNB09 Issue1 (USA), Electron & Castle A7000+

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myelin
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Re: Hello from Charlottesville, VA, USA!

Post by myelin » Thu Jun 14, 2018 6:26 pm

Welcome! And that is a *very* clean looking Beeb! The motherboard and keyboard look brand new...
SW/EE from New Zealand, now in Mountain View, CA, making BBC/Electron hardware projects for fun.
Most popular: fast serial port, FX2+PiTubeDirect Tube/Cartridge adapter, USB cart interface.

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daveejhitchins
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Re: Hello from Charlottesville, VA, USA!

Post by daveejhitchins » Fri Jun 15, 2018 9:05 am

Welcome to the Forum, Robin . . . Enjoy . . .

Dave H :D
Parts: UM6502CE, GAL22V10D, GAL16V8D, AS6C62256A, TC514400AZ, WD1772, R6522, TMS27C512, AT28C256
Products: ARA II, ARA III, ABR, ATI, AP6, MGC, AP5 . . .
For a price list, contact me at: Retro Hardware AT dave ej hitchins DOT plus DOT com

colonel32
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Re: Hello from Charlottesville, VA, USA!

Post by colonel32 » Fri Jun 22, 2018 2:39 am

The recapping and 110V mod went well! Here's a few pics.

I lifted a couple of pads, even though I was being careful. Definitely going to invest in a pump and some braid now.

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I forgot to ask what gauge to use for the link. This was solid copper and about the diameter of the pad holes, so hopefully it is fine.

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In the end I was too cheap to buy spade connectors and a crimper specially, so I spliced, soldered and heatshrunk the new mains cable with moulded plug. The US uses white for neutral and black for live, or what they call "hot". Doesn't seem very intuitive, but I suppose brown and blue aren't either. Black used to be neutral in the UK before the 70s.

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The only glue or tape in the house was Scotch tape, so I burnished it on really well. It was a bugger to get the new fatter cable (stolen from my laptop power supply) in the grommet. I had to melt a wider aperture with the soldering iron...

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Reassembled - didn't go bang at this stage, which was promising.

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Before I cleaned the top case. I alternated steam cleaning and IPA. Most of the gunk came off with the IPA and paper towels, but the steam really helped soften it and loosen it out of the textured plastic.

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Forgot to take a pic of the end result. WIll add tomorrow when it's light.

Thanks for the help!
Last edited by colonel32 on Fri Jun 22, 2018 2:49 am, edited 5 times in total.

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tricky
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Re: Hello from Charlottesville, VA, USA!

Post by tricky » Fri Jun 22, 2018 6:46 am

Well done.
Lifting tracks is quite annoying, but at least they are on the opposite side to the component.

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