Homebrew PCBs

Hi Volkan,
Could you please share info about head driving signals ? What head -
from what printer ? How's data transmited? SPI ? what tension should
be applied to fire the head ? how did you found out those info ? I
have seen an similar article but at that time the nozzles where
addressed individually.

Regards,
DAniel


> Hi Dave,
> I think we need to use fpga because of timing issues. If we assume
that scanning 1 line (8" width paper/pcb)  requires 1 sec and we're
trying to print at 720dpi, this means that we have 1/(8*720) sec or
174 microseconds for each dot. During this time you also need to
download next position data to the head. The alternative solution can
be not to print at 720dpi and do multiple pass to achieve 720dpi.
> Another issue the timing needs to be precise otherwise it can cause
inconsistency in dot positions.
> The inkjet head that I'm using requires 212bits for each color (90
nozzles/color)   and  uses double edge clocking for the sampling. 
From that your clock frequency should be at least 700kHz. 
> 
> Because of above reasons I have decided to use fpga. 
> 
> Cheers,
> Volkan