the stock transistors are below, the BOM contains fairly middle of the road parts, but still with high performance; there is a class A circuit onboard (optionally) and input RF filter (also optional) I will probably upgrade some parts on a couple to see what improvements can be made and where. will use blackgate, rubicon ZA or sanyo oscon SP SMD for the 2 'large' caps. maybe ordering some 0605 Zfoil vishay SMD for an upcoming dac project, who knows I might make a couple of these with them too
any suggestions for audio transistors of this size?? not an area i've really delved into before; these packages are very small!!
BC860C
BC850C
BCP56T1G
BCP53T1G
its not my design, they are tiny!! only recieved the PCBs today, havent made my digikey order yet to build them up; mostly have filled out my BOM, but thinking on what upgrades I could make before I hit the buy button. its the SSB01 rev 1 from
sjostromaudio.com no affiliation. there may be some areas the BUF634 has better specs, even if only because they are able to measure with much higher resolution than Per is, but in my experience; discrete almost always sounds better in the real world. great little PCBs too, 4 layer, gold plate with solder mask and 2 oz copper with 70u traces; these and the regs/psu PCBs I received today are probably the most professional looking DIY pcbs I have ever encountered and as a bonus they are also quite attractive to look at.
rev 0, which was prettier, but had a defect that needed patching; seen below
here is the finished rev 0 board; miniscule
and these ar the REV 1 boards like the ones I received today, 2 pictured above to show both sides
I think these are gonna be both fun and very useful; I grabbed 10 boards, as I know I will find uses for them in a few places. I feel with the right parts choices, these could be a spectacular little performer that is quite suitable for the higher current portable amps and dacs with enough power and room for them. pretty much any amp that has socketted buffers would have room for these if the socket was removed and some even without doing that. its not the exact same as the original diamond buffer, but instead one that has been slightly modified as well as transfered to SMD
anyways; thats both encouraging and disappointing news about the DAC, I couldnt really justify it now anyway, although if it were available, I know I would find a way to
