My new preamp design: Arduino, 6 input selector, MDAC attenuator, IR etc

[maxw]

I added the BoMs:
https://github.com/FutureSharks/prea...l-of-materials

Many of the parts can be substituted.

[danvcs2]

Those are some awesome enclosures!

[doneganm]

Originally Posted by maxw

Thanks. For display I don't know yet. I think LCDs look cheap so not so keen on that idea.

You can definitely use cheap encoders! I don't know what problem you had in the other thread but I've used many cheap encoders before without issues. Sometimes they need some hardware of software debouncing but it's definitely possible

For a display I also didn't like LCDs and in the end settled on a 3.12" 256 x 64 OLED display connected via hardware SPI to a Teensy 3.2 (tiny arduino running at 127 MHz with loads of memory). It's a very sharp display and updates very quickly - perhaps 50 fps or more. Custom fonts and graphics are easy enough to achieve.

I got mine from here: SPI 3.12" ( 3.2" ) 256x64 Graphic OLED White Display ( SSD1322 ) Arduino PIC ARM | eBay

[dimkasta]

I like your RCA idea.
But how easy was it to solder that chunky metal to the pcb? Did you use a torch? Did you have problems with the plastic insulation?

[maxw]

Originally Posted by dimkasta

I like your RCA idea.
But how easy was it to solder that chunky metal to the pcb? Did you use a torch? Did you have problems with the plastic insulation?

It was easy with my 100W soldering iron. No issues with the insulation. A small issue is that the PCB warped slightly I think due to the heat but once mounted it sits flat. I think I could avoid this next time by just being more careful and waiting for the PCB to cool between each socket.

[dimkasta]

Did you try the 805 sockets?
CMC®-Charming Music Conductor.

They should be easier to solder with those spikes at the back. And you would just need two more holes on your pcb part

[maxw]

I have some of these and I'm not convinced they would be easier. There is no flat surface to make contact with the PCB and those "spikes" aren't round. So what I think you would end up with is those square poles in round holes.

[dimkasta]

The one plus I see with them is that they would go through the pcb, so there should be some more mechanical strength to support the whole thing during operation and while tightening the rings from the outside of the chassis.

With the flat surface soldering, any rotation strength or vibration transfers directly to the copper on the pcb.

[maxw]

Maybe. Wasn't really a problem so far though. Feel free to fork the design and create your own

[dimkasta]

Yeah I will probably order some tomorrow and see how the idea can fit in my buffer pcbs