Who said you can't put the SOZ on a PCB?!? A few months back I decided to get in on the 'mini' craze and see if I could apply it to the SOZ.
Turns out, you can! I experimented by simply multiplying the power resistors x3. Ran this around 20VDC, and it sounded excellent; perfect for those desktop speakers.
For my incarnation that will be chassified, I opted to multiply by x2.5, giving 20R and 2.5R for the power resistors.
The plan is to use a 800VA 20V donut. This should give ~24VDC. Using TO-220 footprints all around, I've managed to keep the PCB rather small 5"x2" (127mm x 50.8mm).
The 20R disspiate slightly more than 14W, the 2.5R at 1.8W, and the fets at 10W, for a total of ~80W/channel @ 24VDC. You'll see attached the heatsinks (1 per channel) I'm using, picked up
a bunch of these, tested them out with power resistors up to 120W, you can leave your hand on them all day in the middle of summer! Also used these cool terminals, allows for easy
changes. Anyway, there you go....a desktop (mini)SOZ that dissipates 160W, well maybe it'll fit below the desk😛
-John
Turns out, you can! I experimented by simply multiplying the power resistors x3. Ran this around 20VDC, and it sounded excellent; perfect for those desktop speakers.
For my incarnation that will be chassified, I opted to multiply by x2.5, giving 20R and 2.5R for the power resistors.
The plan is to use a 800VA 20V donut. This should give ~24VDC. Using TO-220 footprints all around, I've managed to keep the PCB rather small 5"x2" (127mm x 50.8mm).
The 20R disspiate slightly more than 14W, the 2.5R at 1.8W, and the fets at 10W, for a total of ~80W/channel @ 24VDC. You'll see attached the heatsinks (1 per channel) I'm using, picked up
a bunch of these, tested them out with power resistors up to 120W, you can leave your hand on them all day in the middle of summer! Also used these cool terminals, allows for easy
changes. Anyway, there you go....a desktop (mini)SOZ that dissipates 160W, well maybe it'll fit below the desk😛
-John
Attachments
Totally cool. We work with what we have.
I'm happy to see that Mouser carries those style heatsinks. Something to keep in mind for future builds.
I'm happy to see that Mouser carries those style heatsinks. Something to keep in mind for future builds.