A large Pad with very Low current can make some Problems
the larger area can absorb more interference than a smaller track
For small Signals it does not make sense to use large areas
But the track must be large enough to handle current and have Low resistance and inductance
For Gate Signals ... I will Check... I think 1,2-1,4mm is possible
the larger area can absorb more interference than a smaller track
For small Signals it does not make sense to use large areas
But the track must be large enough to handle current and have Low resistance and inductance
For Gate Signals ... I will Check... I think 1,2-1,4mm is possible
Last edited:
i checked footprints and it seems that all transistor are ok now.
if i have some time , i will upload a BOM ... so it is easier to collect all parts
and i will order 5PCBs too
actual values are designed for SMD version ...
i will upload a schematic for THT version
some resistors a a bit different
if i have some time , i will upload a BOM ... so it is easier to collect all parts
and i will order 5PCBs too
actual values are designed for SMD version ...
i will upload a schematic for THT version
some resistors a a bit different
This amp has plenty of gain already so almost anything with decent line level can drive it.
The Aksa Lender is a superb preamp if you need one that can swing 40Vpp.
If all you need is buffering and bal/SE conversion with fixed gains 0/6/14/20dB the BTSB is great.
But if your goal is to give the sound some soul of a SE Class A amp with 0.05% second harmonic and 12dB less third and nothing else, try the DCA or the Hakuin. Both can be obtained as Yarra/M2X daughterboards. You can build a nice Yarra PSU and input selector. Or use the Yarra breakout board.
My personal favorite is the Hakuin topology designed by Hugh Dean (Aksa).
The Aksa Lender is a superb preamp if you need one that can swing 40Vpp.
If all you need is buffering and bal/SE conversion with fixed gains 0/6/14/20dB the BTSB is great.
But if your goal is to give the sound some soul of a SE Class A amp with 0.05% second harmonic and 12dB less third and nothing else, try the DCA or the Hakuin. Both can be obtained as Yarra/M2X daughterboards. You can build a nice Yarra PSU and input selector. Or use the Yarra breakout board.
My personal favorite is the Hakuin topology designed by Hugh Dean (Aksa).
I have a question.. I see some improvement on the schematics but the same time the front end was simplifies? Is it not worthy to ad (to keep) the extra par small BJT at the front? Please see the picture in the red box. That was an improvement over the simplified front end. Reason I ask I see work on the PCB still in progress. This in one older version with Toshiba mosfets (uses same footprint as hexfets )
it works also like expected ^^
i did not see any THD improvements compared to resistor or zener variant
but it helps a lot to stabilize at different main voltages.
without this stabilisation the circruit works only at 50V
with your CCS or with zener ist works good from 40-55V
the drift without this stabilisation is very crazy
i did not see any THD improvements compared to resistor or zener variant
but it helps a lot to stabilize at different main voltages.
without this stabilisation the circruit works only at 50V
with your CCS or with zener ist works good from 40-55V
the drift without this stabilisation is very crazy