I've managed to get 3 out of 4 B22 boards up and running, but the last one is giving me trouble. I installed LED+ backwards, but it won't light up even after I fixed it. Pics and measurements here: AMB Laboratories DIY Audio • View topic - no LED+ on B22 board Jeff

Finally got my S22 and B22 boards powered up (only one of each in pics). All 4 S22s tested fine. One B22 is all setup, getting too late to do the rest. I could only get the DC offset down to 7-8mV though. Barely even got hot enough to tell it was on (set at 160mA). Jeff

Quote: Originally Posted by amb You'll need about 12-14mm spacing between each board for the pin/socket connections and to provide enough clearance for the parts. You can stack 4 boards just fine. Great. I was hoping I could stack 4 of these in my 3" tall enclosure in order to...

If you were to stack 4 of these (2 Delta-1s & 2 Delta-2s) what would be the height? Would there be any reason you would not recommend stacking 4 of these? (Assuming you do all the inital config and tweaking before they are stacked.)

Ahh, I see. Seems easy enough to do. Can't wait until you guys start selling all this LCDuino stuff

Cool Another very nice product from the AMB/Linuxworks team. However, I was disappointed to see the last sentence... What would be the best way to adapt/incorpate speaker output switching if I was using this module?

That's a great idea. I picked up some cheap, thin Aluminum to use as some temp panels, so maybe I'll give it a try.

That's cool, I'll be using them if I ever finish my B22. It would be nice if there was some way you could test the layout though. I'm afraid of spending over $400 on panels, then having something not fit, or not be positioned correctly. I shudder at the thought of taking a file, hacksaw or my...

I'm sure this was mentioned somewhere before, but I can't seem to find it. What is the depth of the LCDuino? How much space behind the front panel does it require? Jeff

Very nice work! What are the dimensions of the board?

Quote: Originally Posted by cobaltmute S series are available here: Texas Components - Precision Resistor & Microelectronics I believe qusp has ordered from them Very interesting, if you have a need for super-high precision stuff. They even have "Z" series resistors if S...

Quote: Originally Posted by amb The board will have pads for resistors with 5mm, 10mm and 12.5mm spacings. You could also use a combination of these pads to fit additional intermediate sizes. This means it can support RN50, RN55, RN60 and other sizes too, including the Vishay-Dale PTF...

Cool Eagerly awaiting further developments...

Well, I realized that I could just use the USB connection for sound, so I can at least listen to music now. Would there be any advantage to using the analog inputs instead of USB? I would have to hack together a cable unless anyone knows where to get a mini to dual 1/4" cable.

Is it possible to use the SPIDF out from my soundcard to connect the 0404? I thought I read somewhere that it only worked in certain circumstances. If not, do I use a mini to dual TS cable?

Are the bargraph leds there only for development, or are they going to be on the production board as well?

Quote: Originally Posted by linuxworks I did exactly that - to parallel the input wires with some outputs that go to my sub. in fact, I go thru a 2nd vol control so that I can remotely control sub volume. you may want a LP filter or band split (hp/lp) or just use the one in the...

Great! Thanks Amb

Do you mean there would be no need for one of these? Quote: Originally Posted by amb If you're using a source that is "too hot", then you might want to add an input attenuator at the amp. Here is a schematic of a switchable attenuator. It is drawn for an unbalanced (2 or 3...

Hmmm...strange, I thought I had posted this already, but now it's gone. Anyway, how difficult would it be to incorporate a switchable input attenuator into the LCDuino? I suppose it would take adding a few resistors, a relay and some code, right? Maybe something that could be done on the...

oneplustwo - My heatsinks are about 2.5" tall and the case is 3". If I could manage to stack the S22s somehow, I think it would make things dificult when it comes to troubleshooting. I think I'm actually leaning towards just cutting the heatsinks down. Since I am using four boards, I don't think...

I thought about that, and it may be possible, however I don't like the idea of the unequal heat distribution between the upper and lower mosfets. Good idea though.

Thanks Linuxworks, that helps alot. Do you know what the approximate sizes of the attenuator, input and output selector pcbs are going to be yet? Just looking for an estimate so I can work on my layout. Jeff

Well, I was hoping to preserve the heatsinks if at all possible. Not just for thermal reasons, but I don't have any way to cut them cleanly. If I can't figure something out, I may just have to bite the bullet though. I was trying to keep all the AC on one side (and the inputs on the B22 on...

Inspired by Johnwmclean's PSU layout, I decided to try my hand at Illustrator and figure out how I'm going to squeeze 4 S22s, 4 trafos, 1 E24, 1 S25, 2 S24s and a relay into a 12x16x3 case.... No wiring yet, but here's the layout I have so far. I'm trying to avoid running AC all over the...