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Squeezebox Touch PSU

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#182
lehmanhill said:
It looks like I don't know what I am doing (again) and the spreadsheet was locked from editing. My mistake. I think that I have it fixed now. Someone please try to edit it and report back if it doesn't work.

Jac
Click to expand...

Edits work now - but not sure if it saved...huh, looks like it worked - amazing 😀

Thanks Jac - now if the BOM and schematic were to mysteriously appear....:whip:

Cheers

Jim
 
#183
Hi all, the boards arrived at my work today and the dutch customs was so nice to add import taxes to the order :wave2s:

I will be away till sunday and then I will start packing the packages. I hope to be able to send out all packages to the buyers next week. It is good that a friend will help out doing this job.

The boards look very good ! There is a 115 V (for use in the USA) transformer in the package that will be tested to see if it is a good replacement for the Rcore transformer.

*All but one buyer have paid for their order. So here you have the confirmation that your order has been processed. The single buyer that hasn't paid has been sent a reminder email.

Meanwhile I have bought a lot of rare quality parts for a new project. I will do the new project very different from this one as I now know the challenges that come with it.
 
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#186
Possible 115VAC Rcore transformer?

Went prowling down the back alleys & overflowing trashcans on the Wibbly-Wobbly-Web and stumbled on this cute little 115VAC/50Hz transformer:

Yuan Jing Audio - R-Core Transformer 10VA, INPUT: AC 0-115V, AC 0-115V OUTPUT: AC 0-6V(0.83A) x 2 - USD $23.50 - Transformer

I've never had an issue running 50 Hz rated transformers on 60Hz, as long as I respected their current capacities, and backed off if they began to hum.

I wonder if there'd be an issue running the two 6VAC windings in series to give a usable 1.5 amp output with reasonable overload margin?

Hmmm at roughly 30 Buckazoids delivered here to Aardvark Acres, this seems to be a tempting item.

Cheers

Jim
 
#187
No please don't. I also think you meant to use them in parallel.

I was sent a Triad VPS10-2500 as this type is available in the USA. First tests are OK but I will test a little further. It is silent, can deliver 5A and it is cheap (but despite the price it seems a quality product). I like this transformer as it has a dual bobbin construction and it does not hum. Let me test some more and put this one on the BOM when it tests OK. It needs the secondary 5V windings to be in parallel and it has dual 115V primaries so it can be used in (almost) the whole world. Of course I will have to find out it it delivers enough voltage at full load and this combined with ripple voltage will define if it is suitable or not. Please mind that this means we're creating 5V DC with 5V AC. Many of you that were educated in electronics will shiver but since the reg is a very low drop LDO we can get away with it most probably in 60 Hz countries. With such low voltages the devil is in the details though and every different transformer must be tested and evaluated to see if it works out at 3A (it IS a 3A PSU). I will let you know.

http://www.digikey.com/product-detail/en/VPS10-2500/237-1251-ND/666137

http://eu.mouser.com/ProductDetail/...=/ha2pyFaduh51YhUuwWtSlXPfoSjQw01ndzLgdsQGzU=
 
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#188
OK, most orders have been shipped today. We have been busy for 5 hours to get the stuff packed 😉 Tomorrow all german and some orders to exotic destinations will be shipped. Schematic is polished by Subbu and the BOM will be checked another time. I think you guys would be surprised how much work is involved. Anyway we do it because we like it 🙁, sorry should be 🙂

In total 150 boards have been sold. I still have some left for the latecomers (don't know about Subbu, maybe he has some boards left for US/Canadian buyers). Only 2 Rcores are left for sale and I keep a few for possible lost packages etc.

So if you are still waiting for others to tell you it is a good PSU: this is your last chance to be one of the guys to tell others it is a good PSU !
 
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#189
jean-paul said:
OK, most orders have been shipped today. We have been busy for 5 hours to get the stuff packed 😉 Tomorrow all german and some orders to exotic destinations will be shipped.
Click to expand...

This morning i got the box, well packed! Thanks JP and others.
Measured the transformer: 7,2Vac with load 1,5A; 6,8Vac with load 2,4A.
So enough power i think for the SB.
Regards, Loek
 
#190
Yeah it is a 6V 3.4A transformer so 20 VA which is (way) more than enough but we consider it "just enough" in audio 😉 A Touch does not consume much so you have enough headroom for peripherals connected to the Touch. This was intended. A 5V transformer is possible as the SBT PSU is a very low drop power supply but since margins are tight with these low voltages it has to be checked in every individual case with every type transformer under load. Also some mains voltage deviation must be in the calculation ! Please mind that I have to calculate with 3A absolute max. load although this will likely not happen in real life. The Rcore is an adequate type in most real life scenarios, be it 1A load or 2.5A load. It is not a jack of all trades but it is quite universal. This is why designs for many people need a BOM with recommended parts.

I reviewed the BOM a last time this morning and the schematic was corrected to make it as clear as possible. I hope to send it today or tomorrow.

To all: I will refuse answers to any question like "can I use my 9V 10A transformer" and the like. Sorry to be bold but just imagine the irritation. Please keep to the BOM and the secondary information that is given in the BOM.
 
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#191
It would be very nice if columns could be added with Farnell/Mouser etc. part numbers. Feel free and help you fellow members (and me) 🙂

Who fits the glove ? I added mounting stuff to the BOM. Please note I am metric and use M3 etc.
 
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#194
OK, here is a corrected version 1.4 of the BOM. IC1 was indeed missing which proves I am human (again!) so I am very glad. I asked the mods to remove posts 191 and 193. Let's see the drawbacks of my action to publish it here. Before you know it there are several versions in various posts. This is the last update, if we find more errors it will be placed on a Google Drive. I lack the time to check Loeks additions right now so I guess it will be a Google Drive anyway as we originally intended. My excuse is that I am a builder as well and if I receive PCBs I want to buy the parts ASAP in a feverish way too and build the device 😉 I think you can manage with the current 1.4 BOM. Since I started the confusion I suggest we keep additions per PM to avoid a "BOM jungle". Agreed ?

*Please note that the Triad VPS10-2500 only arrived last week. Subbu or myself still have to test this transformer. In case of the "itch" to build you can choose another transformer as long as it is a 6V 3 to 5A so SIX Volts three to five amperes transformer. Preferably a dual bobbin E type or Rcore type.

Mods, thanks for removing the erroneous posts.
 

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