to EUVL
Hello Patrick,
both boards/daughtercards are working. But I have not tested them in the amp yet.
I am fiddling around with some little issues of my PC- scope. Could become a long night. I also tested the boards with sinus-; squarewave- and triangle-signals.
What I have measured so far - there seems to be no ringing. But I don't really trust my scope and my measurements at the moment. 🙄
The THD+N seems also to be very low. Below 0.0x.
Greets
Dirk 😀
Hello Patrick,
both boards/daughtercards are working. But I have not tested them in the amp yet.
I am fiddling around with some little issues of my PC- scope. Could become a long night. I also tested the boards with sinus-; squarewave- and triangle-signals.
What I have measured so far - there seems to be no ringing. But I don't really trust my scope and my measurements at the moment. 🙄
The THD+N seems also to be very low. Below 0.0x.
Greets
Dirk 😀
M2X - BlackForestBuffer
I have made some tests with the M2X-Black-Forest-Buffer:
DCoffset has settled in to around 3mV.
Temperatures are at around 40°-43°C at the TTA004s (Q3/Q4)
TTA004 (Qs1) is at around 30°C.
The Jfets are difficult to measure , but are at around 35°-40°C
Greets
Dirk
I have made some tests with the M2X-Black-Forest-Buffer:
DCoffset has settled in to around 3mV.
Temperatures are at around 40°-43°C at the TTA004s (Q3/Q4)
TTA004 (Qs1) is at around 30°C.
The Jfets are difficult to measure , but are at around 35°-40°C
Greets
Dirk
Attachments
to Ryssen #4682
Hello Ake,
I have built and listened to many M2X-daughtercards till now.
The only statement I can surely make: they all sound really good!
There is no 'bad' daughterboard. They have different characters.
Some are a little bit better. But that strongly depends on your listening taste.
And the rest of your setup.
Sorry, I can't say - this is the best!? Or: you must built that! 🙄
Built them and make your own experience - it is a nice hobby...😀
Greets
Dirk
Hello Ake,
I have built and listened to many M2X-daughtercards till now.
The only statement I can surely make: they all sound really good!
There is no 'bad' daughterboard. They have different characters.
Some are a little bit better. But that strongly depends on your listening taste.
And the rest of your setup.
Sorry, I can't say - this is the best!? Or: you must built that! 🙄
Built them and make your own experience - it is a nice hobby...😀
Greets
Dirk
Attachments
Yes I will build some of them,but first I must Build the amp.
I am still collecting parts in a week the heatsink should be here....
> DCoffset has settled in to around 3mV.
> Temperatures are at around 40°-43°C at the TTA004s (Q3/Q4)
> TTA004 (Qs1) is at around 30°C.
> The Jfets are difficult to measure , but are at around 35°-40°C
Perfect.
You can get rid of the coupling cap.
Patrick
> Temperatures are at around 40°-43°C at the TTA004s (Q3/Q4)
> TTA004 (Qs1) is at around 30°C.
> The Jfets are difficult to measure , but are at around 35°-40°C
Perfect.
You can get rid of the coupling cap.
Patrick
For those who are interested in the BFB.
I shall publish ther Gerber files later, once it is fully proven.
So you can order them directly, but later.
No need to get them shipped from Germany.
Cheers,
Patrick
I shall publish ther Gerber files later, once it is fully proven.
So you can order them directly, but later.
No need to get them shipped from Germany.
Cheers,
Patrick
= 
A small piece of aluminium angle bolted to both TTAs will help to lower and stabilise temperature.
Patrick
Patrick
If I were you I would try to measure the bias current and see why one is hotter than the other.
If only to understand what is happening.
Patrick
If only to understand what is happening.
Patrick
Mouser, TTI and Digikey are all out of standard J112s for the Mountain View card, other than high-volume purchases. Is there a reliable alternate source?
J112 :: Other Transistors :: Transistors :: Semiconductors :: Electronic Parts :: Banzai Music GmbH
No mention of which manufacturer.
Rochester also has plenty :
Rochester Electronics (en-US)
: Part J112RLRAG
Patrick
No mention of which manufacturer.
Rochester also has plenty :
Rochester Electronics (en-US)
: Part J112RLRAG
Patrick
could the TTA004 be replaced with 2SB649A?
I have some in stock...
No spice model for 2SB649A
I have some in stock...
No spice model for 2SB649A
http://francis.audio2.pagesperso-orange.fr/Modelisation_Spice_2SB649
Equiv. Parts: 2SD669, 2SB649
No idea how accurate.
Patrick
Equiv. Parts: 2SD669, 2SB649
No idea how accurate.
Patrick
Train your fingertips to type
and also
You'll discover that there are tens of thousands of J112's on the shelf, ready to ship out, in surface mount packages. The website findchips.com tells you the magic prefix that goes before "J112" to indicate you want the SMD part. Then mount it on an adapter PCB or else just bodge some wirewrap wire leads.
You'll also discover there are TO-92 (thru hole J112) parts on the shelf at other US distributors, image below.
_
octopart.com
and also
findchips.com
You'll discover that there are tens of thousands of J112's on the shelf, ready to ship out, in surface mount packages. The website findchips.com tells you the magic prefix that goes before "J112" to indicate you want the SMD part. Then mount it on an adapter PCB or else just bodge some wirewrap wire leads.
You'll also discover there are TO-92 (thru hole J112) parts on the shelf at other US distributors, image below.
_
