We disclosed earlier our attempt in build the Kaneda No.168 Lineamp.
This has now been developed further to a full preamplifier to go with a Kaneda-type power amplifier.
The pdf attached describes the details of our implementation.
Patrick
.
This has now been developed further to a full preamplifier to go with a Kaneda-type power amplifier.
The pdf attached describes the details of our implementation.
Patrick
.
The relay controlled resistor ladder attenuator is the same W-ONE as we used in the F5 Preamp.
One can purchase this at AliExpress, but not entirely without problems :
www.diyaudio.com/community/threads/help-with-w-one-ladder-relay-attenuator-remote-control.427834/
The standard W-ONE had shared common Gnd for left and right channels, 50k input resistance, and a large 3-digit 7-segment LED display.
We have replaced the two relay boards with our own 4-layer design to enable separate Gnd for each channel, as well as 10k resistance.
And the LED display board is resigned to suit the 3207 front panel.
In effect, we are only using the MCU board of the W-ONE.
But of course it is still 90% based on the original design concept.
Patrick
One can purchase this at AliExpress, but not entirely without problems :
www.diyaudio.com/community/threads/help-with-w-one-ladder-relay-attenuator-remote-control.427834/
The standard W-ONE had shared common Gnd for left and right channels, 50k input resistance, and a large 3-digit 7-segment LED display.
We have replaced the two relay boards with our own 4-layer design to enable separate Gnd for each channel, as well as 10k resistance.
And the LED display board is resigned to suit the 3207 front panel.
In effect, we are only using the MCU board of the W-ONE.
But of course it is still 90% based on the original design concept.
Patrick
Beautiful, clean build and implementation! Well done once again and congratulations!
I'm looking forward to hearing from test listening sessions
For the low impedence load testing, would this be appropriate for headphones (with or without modification)?
Last question for now - any recommended substitutes for 2SC1400? BC550/54x?
Cheers,
Stephen
I'm looking forward to hearing from test listening sessions
For the low impedence load testing, would this be appropriate for headphones (with or without modification)?
Last question for now - any recommended substitutes for 2SC1400? BC550/54x?
Cheers,
Stephen
Firstly here are the relevant links :
https://www7b.biglobe.ne.jp/~konton/No-168 seisaku-4.htm
www.diyaudio.com/community/threads/any-suggestion-for-modification-of-hiraga-preamplifier-le-preamplificateur-kaneda.405466/post-7540216
The 2SC1400 in the first link is only used as a constant current source.
It is much simpler to use just one JFET plus a source resistor.
I used J113, but any Toshiba NJFET with sufficient Idss (>3mA) will also do nicely.
We have so many nice Class A headphone amps.
So this was not the intention.
It is more to be able to drive long cables for active speakers, for example.
Or perhaps some Class D amps.
Fran has actually already organised a listening session with friends this weekend.
This in combination with the GoFiSS.
An ABC test against a J2 clone being part of the program.
😊
Patrick
https://www7b.biglobe.ne.jp/~konton/No-168 seisaku-4.htm
www.diyaudio.com/community/threads/any-suggestion-for-modification-of-hiraga-preamplifier-le-preamplificateur-kaneda.405466/post-7540216
The 2SC1400 in the first link is only used as a constant current source.
It is much simpler to use just one JFET plus a source resistor.
I used J113, but any Toshiba NJFET with sufficient Idss (>3mA) will also do nicely.
We have so many nice Class A headphone amps.
So this was not the intention.
It is more to be able to drive long cables for active speakers, for example.
Or perhaps some Class D amps.
I'm looking forward to hearing from test listening sessions
Fran has actually already organised a listening session with friends this weekend.
This in combination with the GoFiSS.
An ABC test against a J2 clone being part of the program.
😊
Patrick
The original K168 circuit is the property of Mr. Kaneda.
We shall therefore make the Gerber files available to those interested to try out.
The BoM is set for a gain of 5 ( 10k : 2k ).
This is a simplified version of the PCB that we used.
And we have not tested this particular version, though it has been checked thoroughly.
So use at own risk.
In any case, I suggest you follow the schematics on the PCB to familiarise yourself with the layout before soldering.
We could make the Toshiba JFETs available, should you have difficulties sourcing them.
Patrick
.
We shall therefore make the Gerber files available to those interested to try out.
The BoM is set for a gain of 5 ( 10k : 2k ).
This is a simplified version of the PCB that we used.
And we have not tested this particular version, though it has been checked thoroughly.
So use at own risk.
In any case, I suggest you follow the schematics on the PCB to familiarise yourself with the layout before soldering.
We could make the Toshiba JFETs available, should you have difficulties sourcing them.
Patrick
.