Hello,
I have now 1 6581 and will get a v1 C64 (with a 2nd 6581).
Later, I would like expand the config to have 4x6581 and 4x8580R5
Is it possible to power all that configuration with the original C64 PSU and one 7809 ?
I guess I could adapt the mbhp_8xsid_c64_psu_optimized.pdf document like that:
connect the 6581 as explained
connect the 8580R5 on the 7809 (+9V and ground)
Will it work?
Yes, it should work. I have a mixed setup as well, but with a selfmade psu.
±15v get regulated to ±12v and + 9v
5v is generated from an additional 9v transformer. Current draw is too high for making the 7805 drop some 10v if you use an lcd backlight and maybe additional slave cores and lots of LEDs.
Might even be good to have a 7805 for each slave core.
Make sure that you don´t connect 9v to 12v! 7809 can be driven from the 12v line with no problem. Current draw should be rather small, but still it´s good practise to use a heatsink.
Thanks !