How cool is this guys?
One VSSA channel done, one more to go.
Looks good.
a question:
I looks like your screws are mounted on the PCB? Are the screw holes not big enough so that you can mount the VAS transistors on the heatsink with a good tension?
a suggestion:
Add two GND blade connector so that speaker GND cable can get its own blade connector.
These screws with nuts are just temporary solution to hold firmly transistors against the PCB in the phase of soldering. All three transistors will be fixed to the main heatsink into its M3 threaded holes by M3x16 srews. Will post the pics to clear out that when heatsink arrives.
Nope, the way it is, it is the best - one GND connection point. There(fore) will be only one 6,3 mm GND faston connector circuiting three 1,5 mm2 wires: (+)GND, (-) SPK and (-) GND.
neat and shiny ... wow!!!
is there any risk the output transistor could heat up the caps placed right above it
No way, it cannot happen. PCB will be in a vertical position, 5 mm distance between PCB and heatsink, ALF on big heatsink going max to 60°C.
yes, but doesn't the transistor case/housing get even hotter than the heatsink
well, maybe the rubber at the cap end prevents most of the possible heat transfer
How much hotter? FR4 2 mm plus rubber plus vertical position plus position of elcos, I think this won't be of any problem, especially when you'll see the heatsink hehe
The soldering looks much clean to had been done with low end tools. That is why I asked. Did you use solder paste and its hot air tool for the SMD parts by the way?
This is a very interesting discussion re soldering quality. Looking at the techniques threads there is little there which is adequately deep.
I have just moved over to using Kester lead free silver loaded (with a flux core) and find it to be 'sticky' with an ERSA station. A good thread/wiki on soldering technique would be of great benefit to many here. I am not experienced enough to start it, and would much appreciate it if someone who has experience and can produce really neat joints would do so. I realize LC has far too much on his plate, but any other takers???
I have just moved over to using Kester lead free silver loaded (with a flux core) and find it to be 'sticky' with an ERSA station. A good thread/wiki on soldering technique would be of great benefit to many here. I am not experienced enough to start it, and would much appreciate it if someone who has experience and can produce really neat joints would do so. I realize LC has far too much on his plate, but any other takers???
Have a look on these series of tutorials, very informative:
https://www.youtube.com/watch?v=J5Sb21qbpEQ
https://www.youtube.com/watch?v=J5Sb21qbpEQ
There's 2 mm spacer between PCB and 2SA/SC to set equal distance as ALF, so tripod formed with BJTs can be tighten as much as it's safe for plastic cases, enabling good thermal contact - conductivity.
I could use hot air soldering for SMDs as enabled with WR2002, but in this case I did it in regular technique. I guess experiences is what it matters here.
Who neat gear the WR2002...that all but for sure not a low end soldering tool. I also solder some smd part as present in LC VSSA, can easy be done with classic solder iron only with fine end.
LC i fall in love with your tiny populated board at first eyes look...
Marc suspended on final VSSA sonics result....
LC i fall in love with your tiny populated board at first eyes look...
Marc suspended on final VSSA sonics result....
