so I just finished building this PSU for my DIY Eurorack system.
It's 4 rows of 104HP that I built with wood and rails.
I used a 220V socket by T.E. with integrated filter, power switch and 2x fuse holder.
Then I used a 100VA 2x12V AC toroidal transformer datasheet.
For regulation I used LT1085 (positive 3A LDO regulator) and LT1185 (negative 3A LDO) both in TO220 package with quite big heatsinks.
For the diode rectifier I used this one, but with no heatsink.
After the diode rectifier I used a pair of 22000uF capacitors.
I used thick wire to connect +12V/-12V to the bus boards, and the same thick wire to connect GND from the bus boards to the 220V socket earth connector (instead of going back to the PSU PCB).
I tried it with just a bunch of (DIY mutable instruments) modules and everything seems fine, but before connecting many other modules, I'm wondering if I missed something obvious that I didn't consider (for example, I mounted the transformer directly on wood), and what do you think of it. I'm not an electronic expert by any means so I'm always a bit worried when I need to build PSU and such.
I'm also wondering how many mA could I expect to get from this. Of course not 3A even if the regulators are rated for that, but is 2A a realistic goal?
thanks for your opinions!
It's 4 rows of 104HP that I built with wood and rails.
I used a 220V socket by T.E. with integrated filter, power switch and 2x fuse holder.
Then I used a 100VA 2x12V AC toroidal transformer datasheet.
For regulation I used LT1085 (positive 3A LDO regulator) and LT1185 (negative 3A LDO) both in TO220 package with quite big heatsinks.
For the diode rectifier I used this one, but with no heatsink.
After the diode rectifier I used a pair of 22000uF capacitors.
I used thick wire to connect +12V/-12V to the bus boards, and the same thick wire to connect GND from the bus boards to the 220V socket earth connector (instead of going back to the PSU PCB).
I tried it with just a bunch of (DIY mutable instruments) modules and everything seems fine, but before connecting many other modules, I'm wondering if I missed something obvious that I didn't consider (for example, I mounted the transformer directly on wood), and what do you think of it. I'm not an electronic expert by any means so I'm always a bit worried when I need to build PSU and such.
I'm also wondering how many mA could I expect to get from this. Of course not 3A even if the regulators are rated for that, but is 2A a realistic goal?
thanks for your opinions!
Statistics: Posted by Dimitree — Thu Feb 13, 2025 1:45 pm — Replies 2 — Views 50