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Old 4th Sep 2017, 11:22 am   #1441
Dekatron
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Default Re: The "Sussex" Homebrew Valve Tester.

The small PCBs for the LR8 arrived today and they fit nicely on top of the mainboard, they will have to be mounted on small standoffs so the pins and tracks don't short against the bottom PCB.

As you see they come with two mounting holes for those who wish to use them with older Sussex designs, I couldn't fit more holes onto the size of the PCB as it would have cost a lot more to manufacture then. When mounting them on top of the Sussex board you just break off the edge with the hole and grind down the small protrusions from the milling holes.

I'll ask G8UWM-MildMartin if he is willing to distribute these to interested people.

I'll post an updated schematic as soon as I have tested them out myself, but since I regularly use them in other designs I don't foresee any problems.
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Old 5th Sep 2017, 10:34 pm   #1442
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Default Re: The "Sussex" Homebrew Valve Tester.

Now I have built one of the small PCBs and it works just as designed, I've included a few photos here (I only had 350V electrolytics so I didn't go any higher than 339V in my test).

For this build you will need:

R3: 2.4k
R7: 180k
R29: 390k
TM1: 50k Bourns 3296 Multiturn trimmer
D18: 1N4007
C16 & C17: 4.7uF/400V electrolytic
U1: LR8 (Microchip LR8N3G)

and the small PCB - schematic and PCB will follow soon.
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Old 6th Sep 2017, 5:31 pm   #1443
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Default Re: The "Sussex" Homebrew Valve Tester.

Here are the PCB-files, the Gerber files will make two PCBs side by side as it fits best for the PCB manufacturer I use to produce the cheapest PCBs.

There are also two PDF-files that can be used for those of you who want to make your own PCB, it too has two PCBs side by side - there is a "reversed" and a "normal" version of these and they were printed in 1:1 scale but i might of course differ somewhat on your printer.

The ZIP-archives contains the Geber files necessary to produce PCBs and also the files for the PCB and schematic (with no connection in between them). Observe that the PCB file has the component text added as just text on the right PCB as it is not possible to use two components with the same text in Designspark!

I will ship some PCBs to G8UWM-MildMartin, please contact him for a PCB.
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File Type: pdf PCB Design_ Sussex-PCB_LR8-V9.pdf (14.3 KB, 213 views)
File Type: zip Sussex-PCB_LR8-V9-Gerber.zip (9.4 KB, 100 views)
File Type: zip Sussex-PCB_LR8-V9.zip (18.1 KB, 102 views)
File Type: pdf Schematic Design_ Sussex-PCB_LR8-V9.pdf (12.9 KB, 259 views)
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Old 15th Sep 2017, 5:33 pm   #1444
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Default Re: The "Sussex" Homebrew Valve Tester.

I have just joined this forum with the initial main intention of building the Sussex VT. I'm very happy to find that both the boards and transformers are thankfully still available for this wonderful design. Thanks to Martin and Ed for providing a great service.
I found also that the LCD displays are still readily available, if anyone is struggling to find these please PM me and I will send details of my source.
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Old 20th Oct 2017, 9:05 pm   #1445
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Default Re: The "Sussex" Homebrew Valve Tester.

Quote:
Originally Posted by G8UWM-MildMartin View Post
PM sent.
I have a few of those left, but now sell the current version (as improved by Martin-Dekatron in Sweden) of the main PCB @ 5 and, if required, his design of switch PCBs @ 4 for a set of 4, plus postage.
Hi Martin,

You have a PM from me
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Old 20th Oct 2017, 10:39 pm   #1446
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Default Re: The "Sussex" Homebrew Valve Tester.

Following my previous post I have had a couple of PMs asking for my source of the blue LCD meters, so here is a link to one of the Ebay listings for these, all of the different types required for the Sussex Tester were available when I purchased a few weeks back.

Link:
http://www.ebay.co.uk/itm/3-1-2-Blue...53.m2749.l2648
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Old 14th Nov 2017, 3:14 am   #1447
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Default Re: The "Sussex" Homebrew Valve Tester.

... and for the forum readers "across the pond" in the USA, here is a link to what appears to be the same 199vdc dvm module, listed at ebay.com with free shipping to the states...
https://www.ebay.com/itm/191168661014
... if you're not in a particular hurry to receive it: "Delivery:
Estimated between Tue. Nov. 28 and Wed. Jan. 3"
73,
Steve / K4KM
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Old 14th Nov 2017, 10:19 am   #1448
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Default Re: The "Sussex" Homebrew Valve Tester.

Just a reminder that there are strict forum rules forbidding the discussion of eBay auctions and sellers, though you may post a link to satisfy a specific requirement (as is the case here).
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Old 14th Nov 2017, 10:41 am   #1449
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Default Re: The "Sussex" Homebrew Valve Tester.

Thanks for the link Steve, unfortunately the page, as displayed here, is marked "Does not ship to United Kingdom"
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Old 14th Nov 2017, 11:46 am   #1450
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Default Re: The "Sussex" Homebrew Valve Tester.

Steve's link was for people in the US.
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Old 20th Nov 2017, 11:46 am   #1451
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Default Re: The "Sussex" Homebrew Valve Tester.

Quote:
Originally Posted by Ed_Dinning View Post
Hi Folks, Sussex transformers are still available and are wound to order. PM me if you need one and I'll get it wound on my return.
How do I order a transformer from Ed Dinning?
Barry
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Old 20th Nov 2017, 12:55 pm   #1452
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Default Re: The "Sussex" Homebrew Valve Tester.

Presumably by sending him a Private Message (PM).

You can do this by clicking on his username to the left of his post and selecting the option from the drop down menu.
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Old 4th Dec 2017, 10:51 pm   #1453
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Default Re: The "Sussex" Homebrew Valve Tester.

I'm interested in hearing some comments/feedback on the small LR8 PCB's that I sent to G8UWM-MildMartin which he sold off quickly - has anyone built them and used them for the Sussex or did they go to other projects?

I need this feedback before I incorporate the LR8 design on the mainboards.

/Martin
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Old 5th Dec 2017, 8:52 am   #1454
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Default Re: The "Sussex" Homebrew Valve Tester.

Firstly, thank you so much for the dedicated work that you have put into the tester.

I intend to use the LR8 version on my tester in preference to the Zener chain. I did not think of obtaining the LR8 board at the time as I overlooked the usefulness of the modification. I do intend to make or have made the board now that the initial supply had been sold.

I hope that my comment helps.

Alan
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Old 29th Dec 2017, 3:03 pm   #1455
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Default Re: The "Sussex" Homebrew Valve Tester.

I have just received a batch of 20 PCB's for the LR8 modification. This was the minimum order quantity, I had in mind to help others who would like to do this mod but were unable to obtain one from the previous batch, so as I only need one for myself, I will offer the remaining ones at a rough "cost price" of 2.00 including postage.

If you would like one please PM me and we can make arrangements.
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Old 3rd Jan 2018, 12:52 pm   #1456
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Default Re: The "Sussex" Homebrew Valve Tester.

Here are the promised files for the main PCB combined with the LR8 board.

Please bear in mind that I haven't tested this main PCB myself but since the old design works and the loose small LR8 PCBs work by themselves and the combined board uses both designs I am confident that it will work.

Component values for the extra LR8 parts can be found in post #1442 here: https://www.vintage-radio.net/forum/...postcount=1442

/martin
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File Type: pdf Sussex-PCB_LR8-V9 - Schematic.pdf (72.5 KB, 171 views)
File Type: zip Sussex-PCB-V9-LR8-Designspark.zip (99.4 KB, 74 views)
File Type: zip Sussex-PCB-V9-LR8-Gerbers.zip (56.1 KB, 64 views)
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Old 3rd Jan 2018, 1:42 pm   #1457
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Default Re: The "Sussex" Homebrew Valve Tester.

Hi Martin,

I'm just assembling one of your PCBs with the new LR8 mod. I'm pleased you've altered the layout for the two pots, I'm having trouble finding ones to fit the older design!
If you do another iteration, could you try to fit alternative bridge rectifiers, the in-line ones are quite hard to find, most 1A devices seem to be circular with four-square pinout.
Thanks for your work so far....
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Old 3rd Jan 2018, 4:18 pm   #1458
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Default Re: The "Sussex" Homebrew Valve Tester.

I did a quick check on the PCB and I think that it is too big a project to incorporate round rectifiers, I will have to move many components and traces to accommodate them and it will take too much time.

Where I buy components I have a free choice of either straight or round rectifiers for these small types, even with different pinouts (Mouser, DigiKey, ELFA, Farnell, Conrad, Reichelt and RS-Online and so on).

You can always use isolating sleeves on the pins of a round rectifier and then just bend the pins so they fit the straight rectifier design, you can even bend the rectifier and its pins putting it 90 degrees sideways if you want.

/Martin
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Old 9th Jan 2018, 11:57 pm   #1459
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Default Re: The "Sussex" Homebrew Valve Tester.

Quote:
Originally Posted by G8UWM-MildMartin View Post
I still have (28) PCBs for sale at cost (8.12 GBP).
Plus, maybe, the cost of a padded envelope, depending on whether any suitable used ones are being thrown away at work, plus the ever-increasing Royal Mail postage cost, minus the discount from using the franking machine at work, plus any applicable curency transfer or exchange fees.
Are any of these board still available?

Kind regards

John
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Old 10th Jan 2018, 9:48 am   #1460
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Default Re: The "Sussex" Homebrew Valve Tester.

Yes, there are some of the originals left, but the newer ones are better and cheaper:
Main board + LR8 add-on board + 4 switch boards for 8.76 including postage.
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