Pars

Transformer mounting: for an Antek 50VA, for mounting to a 3mm aluminum bottom panel, I would like to countersink the mounting bolt. Not sure what size of bolt Antek uses, but Avel Lindberg uses M5 bolts. Could I get away with countersinking an M5 in 3mm aluminum? Or would an M4 be big enough for the transformer (I'm thinking yes, but wanted my daftness evaluated before I do any drilling).

I see Jeff provided the proper HC advice? If you have some scrap 1/4" aluminum, I'd try it with the Dremel. Aluminum is pretty soft, so it might work acceptably? You may go thru some blades, so some spare(s) would be a good idea.

Happy belated Birthday Grahame!

2sc5200 and 2SA1943 are another alternative.

Those cases look really nice, but if you say they are expensive for someone living in Germany, I guess us US or other based folk might find them very pricey!

Would there be any problems with using BC556B parts with BC546C? Both On-Semi? I'd be buying 100 of each. Vendor doesn't have the 546B parts in stock (on-semi).

RIP Sidney Poitier https://www.cnn.com/2022/01/07/entertainment/sidney-poitier-death/index.html

Happy Birthday!

Happy Birthday!

Sorry for your loss Todd... sounds like he was a neat friend.

I believe you can use 2SA1943/2SC5200 in place of these, or their Fairchild # equivalents. Slightly less power handling.

Happy Birthday man!

Yes, arrow is reliable. And they take private individuals as customers. Since they have multiple warehouses around the US, if you order much, you will get multiple shipments, in big boxes (for the items being ordered/shipped). Kind of irritating, but they are reliable.

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Merry Christmas all!

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12/12 would only give you 12 * 1.414 = 16.96 - 1.4 = 15.56, so probably good for +/- 15V GRLV, depending upon how much overhead you need for a GRLV, and I would probably use 15/15 for that.

Take a look at amb's site for the o22. Dual secondary 35/35 = 70V CT. https://www.amb.org/audio/sigma22/ 18/18 would be 36VCT.

12V is too low for a 20V output. I'd use dual 18/18. 12V would give you 12 * 1.414 = 16.96 - 1.4 = 15.56V. I don't think the math is any different for a center tap / single bridge application, but I could be wrong. In answer to your question, #1 is correct. You can use a dual secondary transformer configured as a CT.

Happy Birthday Ken!!!

For the case, the anodizing will isolate each panel from one another. Many people use a bit of sandpaper or abrasive to clear the anodizing in a small area in between panels, and where the PE ground is connected from the IEC terminal. As for the PSU ground, I would not connect it to the chassis directly, but use a ground loop breaker (see https://www.diyaudio.com/community/threads/audio-component-grounding-and-interconnection.163575/). For the case, once you are satisfied, I would check with an ohmmeter to make sure you have continuity.

Interesting (for someone who has never tried buying direct from Japan). For us who aren't fluent in Japanese, are there any services you would recommend to assist? Just looking at Buyee now. Nothing I really need, but I like that they limit volume.

Those in the other set will be fine.

Nice idea! I like how you did the front panel in two layers. Where are you located and doing/having this done at? And what kind of cost comparisons have you made? I know FPE is expensive for machining, as is Modushop. Why FPE doesn't add re-anodizing also is beyond me. The FPD software works pretty well (for those of us not versed in 2D/3D CAD), but does have a lot of limitations in terms of what it can do.

Happy Birthday!