Sunoo wrote on 2022-04-30, 20:26:

I think I found an issue with what you grabbed. For the amplifier, you have a TI TPA152DR, but that seems to have a completely different pinout than the MS6308 or TDA1308 specified. Unless I'm mistaken, the STM TS482IDT should be pin compatible though, and appears in stock at Mouser. Not sure if anyone has a better suggestion though.

Thanks for the info and suggestions everyone!

I kind of want to be consistent with the part sources. So going with the TS482IDT, does STM also make a compatible OpAmp to replace the TI that I have on there now?

In other news, a friend of mine isn't making use of his soldering tools, so he's going to let me borrow them indefinitely for my projects! A soldering iron, multi-meter, solder, flux, and even some practice stuff!

Edit: They sure do! https://www.mouser.ca/ProductDetail/STMicroel … Kv5CLV5lQ%3D%3D

Got a pleasant surprise today when my Utsource order showed up. This is despite the tracking status on their site still showing as "Waiting for shipment".

This just proves you can't always trust online tracking statuses.

Lucky! You may have scored the last ones in their inventory.

Sunoo wrote on 2022-05-02, 15:29:

Lucky! You may have scored the last ones in their inventory.

That may very well be the case.

I'm surprised their web site still lists over 30k in stock of these. Guess those numbers don't mean much either.

I’ve spent some time looking through this thread, but haven’t found an answer. Is there a tolerance I should be sticking to for the capacitors (and to a lesser extent, the resistors)? I didn’t see anything mentioned in the BOM, and I couldn’t find anything in the thread, though I may have missed it.

Sunoo wrote on 2022-05-02, 15:46:

I’ve spent some time looking through this thread, but haven’t found an answer. Is there a tolerance I should be sticking to for the capacitors (and to a lesser extent, the resistors)? I didn’t see anything mentioned in the BOM, and I couldn’t find anything in the thread, though I may have missed it.

I followed one of suggested BOM; SMD resistors and capacitors are between 1% to 5% tolerance. Electrolytes are 20%. So stick to 1% unless it is much more expensive then get 5%. I don't really think 1% to 5% make any differences.

Thanks. For some of the ceramics I wasn’t really finding better than 10%, which seemed odd. I guess I’ll have to fiddle with my search parameters and try again.

Just a random note thrown in with some parts getting increasingly difficult to obtain: Since RC1 the card also supports straight and 45° SIMM slots rather than just 90° ones.

So I took a look at the 72-pin connector I had on there, and it was #1 Out of stock and #2 tin pins.

That has been corrected to gold pins and just our luck, in (low) stock.

Edit: I see that many of the Panasonic resistors are not in stock as well. Any suggestions on replacements of the same or better quality?

Edit 2: An update Mouser BOM has been uploaded here: Re: ARGUS Project thread - now sold out (gerbers will be released soon)

IcySon55 wrote on 2022-05-04, 14:02:

So I took a look at the 72-pin connector I had on there, and it was #1 Out of stock and #2 tin pins.

That has been corrected to gold pins and just our luck, in (low) stock.

Edit: I see that many of the Panasonic resistors are not in stock as well. Any suggestions on replacements of the same or better quality?

What's the reasoning between Quantity 1 and Quantity 2 in your BOM?

skel2raw wrote on 2022-05-05, 13:22:

IcySon55 wrote on 2022-05-04, 14:02:

So I took a look at the 72-pin connector I had on there, and it was #1 Out of stock and #2 tin pins.

That has been corrected to gold pins and just our luck, in (low) stock.

Edit: I see that many of the Panasonic resistors are not in stock as well. Any suggestions on replacements of the same or better quality?

What's the reasoning between Quantity 1 and Quantity 2 in your BOM?

Quantity 1 is the exact amount required for the card while Quantity 2 is the "I'm an idiot and don't know what I'm doing" amount to allow for mistakes. 🤣

IcySon55 wrote on 2022-05-05, 13:26:

Quantity 1 is the exact amount required for the card while Quantity 2 is the "I'm an idiot and don't know what I'm doing" amount to allow for mistakes. 🤣

This is a good rule of thumb even when you know what you're doing. When buying electronic components it's always a good idea to buy more than you think you'll need to account for defects, damage, etc.

This is especially true for tiny SMD components. Each and every one is fitted with a tiny jet engine and will rocket into another dimension if you handle it wrongly or breathe in its general direction.

Kahenraz wrote on 2022-05-05, 15:21:

This is especially true for tiny SMD components. Each and every one is fitted with a tiny jet engine and will rocket into another dimension if you handle it wrongly or breathe in its general direction.

haha I like this way of describing it. But unfortunately sounds about right. If you don't hold the part properly, it just falls off or flies away.

Working with components this small makes me feel like I have Parkinson's Disease. I also can't do repair without a microscope, due to my corrective lenses. I am very, very bind.

I usually go try to find the part, and sometimes I do find it 🤣. But yeah, hold them wrong and they fly away

I have sent so many SMT parts to Narnia while working with them. Last project I ended up needing to place a second order for more, so this time I’m going to buy way too many extras.

In the rare case when these tiny SMD parts or screws do not abandon the space-time continuum I eventually find them but in the most unlikely places, as if they had taken an impossible trajectory. Once I had a tiny resistor end up inside a small bag of screws that had a minimal opening and that was nowhere near close where I expected it to fall.

I just got the confirmation from the fab they have received the blank PCB..
I am still awaiting the delivery of the Interwave chips since April 29th. You can track the shipment here : CY561305075DE

Synoptic wrote on 2022-05-20, 13:50:

I am still awaiting the delivery of the Interwave chips since April 29th. You can track the shipment here : CY561305075DE

My experience shipping from Germany to Canada has been 1-2 months transit time. So if they were sent April 29, then maybe sometime in June to arrive?