John Bennett
Senior Member
Just seeing if I can 'make it work', then I'll let you do the magic on it. Been sketching things on paper and staring at photos for too long this evening to not give it a shot
Space Harrier /OutRun DX Motor OpenBoard Project
- Thread starter NaokiS
- Start date
Just seeing if I can 'make it work', then I'll let you do the magic on it. Been sketching things on paper and staring at photos for too long this evening to not give it a shot
John Bennett
Senior Member
tin said:check out my artistry!
Fantastic - it was the track to pin 14 that I couldn't solve, but that answers it!
Naoki - I think I've implemented it (I apologise if it's not as tidy as you'd make it).
John Bennett
Senior Member
Still feels a team effort
Schematic-wise, there's a few signals on the original that are joined by net names, rather than lines. I had to take some provisional guesses on some of them (ACZERO, etc), as they're just smudges.
Naoki might have validated some of them when routing, but I think we've got some confusion around IC2 (there's comments on the schematic).
Schematic-wise, there's a few signals on the original that are joined by net names, rather than lines. I had to take some provisional guesses on some of them (ACZERO, etc), as they're just smudges.
Naoki might have validated some of them when routing, but I think we've got some confusion around IC2 (there's comments on the schematic).
John Bennett
Senior Member
We still also new to source a heatsink or the TO-220 triacs. Needs to fit the solder mounting holes and come from Farnell or RS (or we get something close and add an extra set of mounting holes).
All the digital routing seems to be done. Power polys are finished on the digital portion.
Having said that I'm convinced ACZERO and !ACZERO are flipped. The routing does not make sense compared to PCB picture and how the board flows.
Also can we turn off thermals or prefer to leave them on? Either way doesn't affect me, just the original had no thermal relief
Otherwise I see only the power driver portion to go!
NaokiS2018-06-03 00:55:59
Having said that I'm convinced ACZERO and !ACZERO are flipped. The routing does not make sense compared to PCB picture and how the board flows.
Also can we turn off thermals or prefer to leave them on? Either way doesn't affect me, just the original had no thermal relief
Otherwise I see only the power driver portion to go!
NaokiS2018-06-03 00:55:59
John Bennett
Senior Member
Looking great! I'm ok with losing the thermal reliefs - it's unlikely to be me soldering them all up
Does beg the question - will folk want all ICs socketed for convenience?
I've done a little more on the power circuit. Thought I had found a heatsink, but there's a bit of a clearance issue
I should also mention that I've been creating parts for the original components, even if they're obsolete - seemed the easiest way.
So at some point we'll have to create a manual parts list - would be good to get 2 or 3 alternatives for some things.
Oh and I've not yet added the alternative tracks for allowing an alternative to the TLP511 - when I do, it'll mean we'll have to adjust the routing slightly (as there's no pin-for-pin alternative).
Does beg the question - will folk want all ICs socketed for convenience?
I've done a little more on the power circuit. Thought I had found a heatsink, but there's a bit of a clearance issue
I should also mention that I've been creating parts for the original components, even if they're obsolete - seemed the easiest way.
So at some point we'll have to create a manual parts list - would be good to get 2 or 3 alternatives for some things.
Oh and I've not yet added the alternative tracks for allowing an alternative to the TLP511 - when I do, it'll mean we'll have to adjust the routing slightly (as there's no pin-for-pin alternative).
John Bennett
Senior Member
Thanks - I was actually wondering what space there is around it.
Unfortunately they're overlapping on the PCB. The cases are also 'live' (as they're bolted to the tabs on the TO220s) so they'll have to have a fair clearance.
At least it won't short the mains out if they ever touch, it'll just connect one motor to the other.
The originals look like a fairly substantial bit of metal, but in a narrow footprint. Might be that we don't need something as chunky if modern Triacs are more efficient - not looked yet.
I'll leave it for now and try to put the other parts down.
John Bennett2018-06-03 11:36:22
Unfortunately they're overlapping on the PCB. The cases are also 'live' (as they're bolted to the tabs on the TO220s) so they'll have to have a fair clearance.
At least it won't short the mains out if they ever touch, it'll just connect one motor to the other.
The originals look like a fairly substantial bit of metal, but in a narrow footprint. Might be that we don't need something as chunky if modern Triacs are more efficient - not looked yet.
I'll leave it for now and try to put the other parts down.
John Bennett2018-06-03 11:36:22
John Bennett
Senior Member
Thanks - loads of space.
Not expecting anything like the image I posted though - I'll hopefully find something resembling the original - it's the width that's the challenge, more so than the height.
Not expecting anything like the image I posted though - I'll hopefully find something resembling the original - it's the width that's the challenge, more so than the height.
