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mwl168

DIY mini T2 Build Thread

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19 minutes ago, mwl168 said:

Happy to organize a GB if there is enough interest. 

Please raise your hands and state quantity desired here if interested. 

I guess you already had me in mind, right?  ;D

Edited by jose

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The main board does not need to be assembled but the regulator modules do (2 per power supply).

On 3/12/2019 at 8:07 AM, JoaMat said:

It looks like the LT1021 is abandoned by most supplier. Mouser is out of stock but claims that it’s on order. There is another 10 volt reference LT1236-10 that I think should be a good alternative. I’ve tested it in LTspice model by Kerry (jump here for reference and more info) and it seems to do the same as LT1021-10 but with 0.2 mA lower current with same current set resistor. Someone has to verify LT1236 works.

I guess Kerry needs a couple of LTxxxx in above PSU.

For the Power supply modules, using the LT1236 should reduce the heat on the CCS pad feeding the reference by about 5 deg C. 

I haven't tested this yet, but it seems like a good substitute and possibly preferable.

PS - Just thinking out loud, the LT1021-7 might be the best option here.

Edited by Kerry
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Interested depending on cost :)

 

Edit: If there will be runs for GRHV and GRLV as well then I am definitely in for a set.

Edited by Scgorg
Clarification

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We'll also need to do the GRLV boards as well.  So to get this up and running is 2x GRHV78xxx, 1x GRLV78xx (mini or micro), 1x GRLV79xx (mini or micro) + the main board.

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There are three wire jumpers on each boards. Two for big tubes filament so two good wires between the tubes. Then there is a small jumper along one side of OP27 (see silk screen component side (which one now that is…)), easy to forget - I use a piece of a wire from power resistor. It connects -15V to the balance opamp.

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I started a thread dedicated to the group buy of Kerry's PS boards and JoaMat's mini T2 boards. Let's move all GB related discussions to the new thread. 

Thanks! 

Edited by mwl168

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Now when there are nice tapping tools out there I think I try mount sands direct on heat sink. I've done this today.

IMG_0267.thumb.JPG.3607637bfc702129704707a4be036cae.JPG

IMG_0266.thumb.JPG.e0e1349bac3f6607f7c01ab35419d002.JPG

I cut of 20 mm of the board where the bracket should be so now it’s 80 mm x 160 mm. The layout was not meant for this so there is a need for a couple of extra jumper wires. Most things are doable.

Here is my tapping tool with rather long shaft M3 tap.
IMG_0268.thumb.JPG.b7492bc2f7366a57d97c37b79b921c0e.JPG

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