believe me - autorouting just makes things harder
say that you finely arrange parts ..... run autoroute
then spend zillion of hours editing things, to optimize what needs optimizing
it's faster with brainrouting
now, main thing with drawing pcb is start ....... easier if you have predetermined pcb dims, as I sorta embraced Papa's FW format ( even if edited after)
if not, I'm just lettin' my brain to wander ........ great fun!!
say that you finely arrange parts ..... run autoroute
then spend zillion of hours editing things, to optimize what needs optimizing
it's faster with brainrouting
now, main thing with drawing pcb is start ....... easier if you have predetermined pcb dims, as I sorta embraced Papa's FW format ( even if edited after)
if not, I'm just lettin' my brain to wander ........ great fun!!
Let's make it on topic for a quick statement. I tried adjusting the BFR from 22 to 470. The amp sounds really cool this way. I like it both ways. I have little female terminal posts in the BFR position so I can change the BFR around for a bit. I may play with this for a while assuming the contacts do not get crusty.
Okay back off topic:
I tried KiCad and had trouble with the library. I spent some time with it and kind of just gave up. As a last ditch effort I switched to EasyEDA which is really been quite spectacular for starting out. The library is very complete. I really have not found any limits as far as my use.
I have eagle on my computer which I need to start playing with at some point. That has auto routing as well. I would assume that Kicad has it.
The auto routing does not get it perfect. You can set the perimeters as far as how wide the traces are, how long the traces are allowed to be the clearances etc.
Okay back off topic:
I tried KiCad and had trouble with the library. I spent some time with it and kind of just gave up. As a last ditch effort I switched to EasyEDA which is really been quite spectacular for starting out. The library is very complete. I really have not found any limits as far as my use.
I have eagle on my computer which I need to start playing with at some point. That has auto routing as well. I would assume that Kicad has it.
The auto routing does not get it perfect. You can set the perimeters as far as how wide the traces are, how long the traces are allowed to be the clearances etc.
I find everything difficult when doing a layout. The traces are always too fat, there is never a handy resistor to jump a trace, it’s to cramped, it’s a massive puzzle… Then I copy most of someone else’s as they have thought about it already. You then need to triple check everything at least twice. Make footprints as the defaults are not quite good enough.
After all that you are not happy so you start again from scratch a couple of times.
After all that you are not happy so you start again from scratch a couple of times.
pretty much yes
note - first batch of pcbs gone out with footprint for 3pcs of 3W resistors in each rail
later pcbs gone out with 5pcs of 3W resistors in each rail
so, in first case , use 3pcs of 0R33/3W
in second case you can use that or 5pcs of 0R56/3W
power of resistors not critical, as reason for change, just to allow me to choose, depending which ones I can get in quantity in particular moment in space and time
note - first batch of pcbs gone out with footprint for 3pcs of 3W resistors in each rail
later pcbs gone out with 5pcs of 3W resistors in each rail
so, in first case , use 3pcs of 0R33/3W
in second case you can use that or 5pcs of 0R56/3W
power of resistors not critical, as reason for change, just to allow me to choose, depending which ones I can get in quantity in particular moment in space and time
presoldered, same as tiny JFets and all smd resistors and caps
LT3092 stays exclusive for XA252
ZM too much of a Chicken to play against wild xconductance of pucks, so no less stable options
LT3092 stays exclusive for XA252
ZM too much of a Chicken to play against wild xconductance of pucks, so no less stable options
Zen Mod,
please specify transformer AC voltage and current for 35 V dc rails and Iq 2 A
I plan to use dual mono setup
please specify transformer AC voltage and current for 35 V dc rails and Iq 2 A
I plan to use dual mono setup
per channel:
Donut 250VA (or more), 2 secondaries of 28Vac each , so using one bridge per secondary arrangement, having established GND after bridges
that resulting in 35Vdc rails under load, Iq anything from 1A5 to 2A, depending what your heatsinks can cope with
cap bank; CRC per rail , 22mF - 0R1/5W - 22mF , where 22mF is minimum
for 35Vdc rails, 40Vdc caps, or higher
Donut 250VA (or more), 2 secondaries of 28Vac each , so using one bridge per secondary arrangement, having established GND after bridges
that resulting in 35Vdc rails under load, Iq anything from 1A5 to 2A, depending what your heatsinks can cope with
cap bank; CRC per rail , 22mF - 0R1/5W - 22mF , where 22mF is minimum
for 35Vdc rails, 40Vdc caps, or higher
Are folks starting to build the XA252 now? Looking forward to seeing some fugly builds & impressions. 🙂
Hopefully soon if customs decides to release the goods.
Big chassis is waiting…. 😜
Big chassis is waiting…. 😜
Bubba, did forgot to ask - how hot are those IXYS diode bridges?
if you can keep your fingers on them after 2h of work, good
if not, more hsinking needed
if you can keep your fingers on them after 2h of work, good
if not, more hsinking needed
IIRC, all of the SissySIT revisions are essentially the same sonically -- mainly just improvements in biasing/part compat. & offset stability?
Decisions, decisions; I’ve got both pucks and Tokins, so which variant should I make?? I know there is no wrong answer, but that doesn’t make it any easier to decide !