GB4 for Pioneer Super Linear Headphone Amp PCB set?

[EUVL]

Further to the above :

The BoM for the SHPP is generic so that it can also be applied for higher rail voltages.
For the +/-15V for the Pioneer SL, some other alternatives can also be considered.

IC1 -- Any JFET input dual opamp in SOIC8 and +/-15V will do, e.g. OPA1642 ir OPA2145
Q1~5 -- I have been using Toshiba 2SC3324/2SA1312, but now replaced by 2SC2713/2SA1163, in BL grade.


Patrick

 

[pgour]

PCBs received.
Thanks 🙏

 

[chakaandgeorgie]

Help please. I am struggling to find out about the board labelled cross field regulator. I can't see any BOM or schematic. From some of the pictures it looks as if it is with shpp. Is it even necessary?

 

[EUVL]

My apologies for the confusion.
We normally do not include this one in the GB.
It is an extra for this time only.

This PCB can either be used to power the cross feed buffer (if you are not using passive cross feed), or the SHPP
All it is is 2 caps C1,2 (e.g Nichicon KA 47µ 35V), IC1 78L15, IC2 79L15; that's all.
You can of course also use 78L12/79L12 or 78L09/79L09, as you like.
Preferably from Onsemi.

Output caps are not necessary for stability.
But if the cross feed buffer or the SHPP are too far away, maybe you wish to solder 2x 0805 Murata 100n 25V+ under the output pins.


Patrick

 

[chakaandgeorgie]

Thanks for the clarification Patrick.

 

[XACOO]

To

chakaandgeorgie​

My apologies for missing your PM earlier, now answered.


Best regards,
XACOO

​

 

[mlackey]

Late to the party... are all boards from the last group buy taken? Stated differently, are there any boards still available?

 

[EUVL]

All sold out, but maybe a new design later, show here as a line amp without the power devices.

Patrick

 

[EUVL]

You can find more details here :
https://www.diyaudio.com/community/threads/inexpensive-preamp-kit-on-ebay.373032/post-6679513


Patrick

 

[mlackey]

Maybe Gerber files?