Part Sourcing Assistance/Advice Thread

[Helium]

It deforms inside (punch side), not outside (die side).

[kevin gilmore]

I have D punches and the IEC punch.

 

yep they deform the metal but only on one side, so

you make sure the other side is the outside.

 

wrapping the die in some electrical tape along the

surface helps making no marks.

Edited June 6, 2015 by kevin gilmore

[Helium]

I have D punches and the IEC punch.

 

yep they deform the metal but only on one side, so

you make sure the other side is the outside.

 

wrapping the die in some electrical tape along the

surface helps making no marks.

Wow IEC punch. Can you give punch maker/model (greenlee, ruko, qmax...) and corresponding IEC maker/model? I'll look into it.

[kevin gilmore]

it was a greenlee, I had to order it from Newark and it came from Germany.

it was about $200. birgir has one too, (and he posted pictures of the one he broke)

so he can dig up the part number easier.

[spritzer]

Mine came from RS components.  They have a huge stock so just find one which is the closest size to your preferred IEC. 

[kevin gilmore]

yep, that is where I bought mine, no wonder I could not find the invoice

[Helium]

Checked rectangular knockout punches of many makers, couldn't find one that cuts hole for IEC at once (punch size and IEC size must match).

So will stick to RS 545-345 which is 28.2 x 22.5mm for my favourite Qualtek 764-00/002. Will have to cut 4 overlapping holes.

OEM is Manuform MA9730140.

BTW, they have MA9740040 which is 31.4 x 28.3 with radius corners, but that is 2 times more expensive.

[ang728]

interested in 4-gang alpha pots 3RP/2142G-XA1

 

anyone knows where can I get it?

[Rodeodave]

Where do you guys order your PCBs from? And what board material and copper thickness do you specify?

[gepardcv]

I use iTEAD Studio (http://imall.iteadstudio.com). 2oz copper, 1.6mm or 2mm boards. No complaints so far.

[UFN]

If some out there has an (as yet) unfulfilled death wish or just wants to build a massive PSU, I guess you can't beat this offer

 

http://www.partsconnexion.com/RIFA-77696.html

 

//UFN

[n_maher]

Those look like they would be fun to use as an output coupling cap.

[Craig Sawyers]

That is a massively good price for a RIFA cap.  Almost wish I had a project to use it on.

[DefQon]

Indeed it is, very reliable and long shelf life (10 years no problem). I still have some of the older PEH165 and 169 series. 

[luvdunhill]

Any chance someone could help me source a single V-Cap TFTF 0.1uF / 600v? It seems these will no longer be made. Used is fine.

Edited June 30, 2015 by luvdunhill

[Victor Chew]

http://www.hificollective.co.uk/catalog/-c-61_68_445.html

[luvdunhill]

Seems they sell pairs only? It's better than nothing though, thanks!

[luvdunhill]

They decided to sell me one from their warrantee stash. Excellent! I think I might even put a pair of salvaged caps as PSU bypass for fun.

[lkong]

Snake oil aside. Recommendations for hook up wires for internal wire and headphone recabling? Better be soft and thin (26AWG~)

[nopants]

navships on ebay has some wired that was contracted for the Trident Missile program, that stuff is really nice to work with. a bit stiff but it depends on what you're looking for I guess. I think it's a kapton wrap

[lkong]

navships on ebay has some wired that was contracted for the Trident Missile program, that stuff is really nice to work with. a bit stiff but it depends on what you're looking for I guess. I think it's a kapton wrap

I've used navships SPC wires a lot. Great stuff, cheap price but damn stiff. 

[luvdunhill]

I have a really really dumb question.

I would like to get as many turns of a trimmer over as small as a range as possible. For example, 25 turns over 1 ohm. What's the best strategy to do this, a series resistance to set the approximate value, then a resistor in parallel with a pot I assume, but how to size the pot (large or small) and the resistor, without having to do math is the question?

[nopants]

sounds like a job for 2 pots in series with a resistor in parallel, are you actually shooting for 1 ohm? I assume it's something like 

 

(N_pots*R) || N_pots*R₁ || ... || N_pots*R_N

 

Add one resistor in parallel for each pot you add in series to the chain? Sorry if I pulled a dumb in the formulation

Edited July 6, 2015 by nopants

[luvdunhill]

No, it would be something like nearest E96 resistor in series and adjustment at a minimum of that resistor (minus tolerance, assume 1%) and the next available E96 (plus tolerance).

Edited July 6, 2015 by luvdunhill

[JimL]

Well, the smallest commonly available trim pots appear to be 10 ohms, so you would have the fixed resistor plus the trim pot in parallel with a small value resistor, e.g. for a 1 ohm adjustment range, 1.2 ohms would give you an overall range between 0 and 1.07 ohms.  The adjustment won't be close to linear - about 1/2 the adjustment range would be in the lowest 10th of the trim pot range with hardly any change at all over the upper half of the trim pot range.

Edited July 7, 2015 by JimL