Sync busboard design - for Cadet DIY systems

cadet

#57

ok, with that confirmed, I’ll make an updated layout.
:space_invader: time for prototype number 2!

the builder can decide to solder the buffer & RCA output or skip those sections.

I’ll keep you posted!


#58

blip


routing in progress


#59

routing was a bit more complex this time. can anyone check if I did ok?
especially the power lines . and the sync signals

I still think I should do something with the 2nd half of the LM6172. Any suggestions?
maybe a 2nd C-SYNC buffer, but without the RCA connector? (because that wouldn’t fit)


#60

Maybe just run it to some unpopulated pads as a “DIY/you figure out what to do with it/AUX” C-Sync out? Given that option, I personally would use it to add a BNC connector on a flying lead.


#61

yeah , that is a good idea.
I’ll make a jumper for it, so that if you do not use this option, the stage is grounded.
(like in the schematic above )
Maybe I’ll add a “experimentation area”.

Question: Shall I leave out the resistors + capacitor, like in stage 1?
Maybe I can fit them, but if it is an experimental area, It might be useful not to have a predetermined use.


#62

new stuff. 2nd c-sync bus for alternative connectors. / extra output.
When not used, there is an easy grounding option next to the LM6172. so a bypass = 2 jumpers
It all fits, so that is cool! The pcb has a less funky shape, oh well
And I’ve added one extra sync header. so there are nine in total!
Last check before I send it to China!



#63

I don’t know anything that would be helpful here but thank you for doing this!


#64

Ok, it is in production now.


#65

Ok, they just came in! All is soldered now (I’m a few headers short), next is testing.
:dancing_women::cat:


#66

Cool! Excited to see!


#67

First test is good! :grinning:

I need somebody to test the RCA sync output. Volunteers?


#68

I have a visual cortex and other LZX RCA sync modules/vidiot, I’d be happy to test it out.


#69

Where do you live? I would prefer someone in the EU because of the shipping time, but we will see :slight_smile:


#70

test 2:

  • RCA Scope view: looks good.

  • multiple sync busses used. = OK


#71

we have a volunteer!!!
let me know - see PM


#72

ah I’m in the US I’m sure you’ll find someone closer :slight_smile:


#73

yes, me, I live quite close to Martijn


#74

Okay, we tested the busboard with LZX modules this afternoon. Thanks Jim!

  • RCA sync out --> works (tested with Prismatic Ray)
  • VC 14pin sync out to busboard -> works
  • busboard RCA out to RCA input 2nd sync gen --> works

So I declare it functional!

I’ll make a buildguide & BOM.
The pcb’s / kits / build units will be offered for sale.
I’ll ask Lars if it is ok to do it from this forum. I have an Etsy store as well.

I have 20 pcb’s in stock right now.

The price for a pcb will be about 20,- euro


#75

It was a pleasure, Martijn!!

I have a busboard in my bag to test the BOM/buildguide

I’m going to test it with a frequency central psu - so will report back once all parts are delivered and I’ve built them


#76

hah. How did I miss this. Good work Martijn!