The JFETs are, as described in
Dispre 2 - JFET english
2SK170/2SJ74, with Idss in range 4 - 9mA, but all matched to +/-0.2mA for 8mA devices or +/-0.1mA for 4mA devices.
The output transistors are BD139/140. The rest are BC550/560.
Dispre 2 - JFET english
2SK170/2SJ74, with Idss in range 4 - 9mA, but all matched to +/-0.2mA for 8mA devices or +/-0.1mA for 4mA devices.
The output transistors are BD139/140. The rest are BC550/560.
I am glad it has arrived quite fast in Malaysia, it took just one week.
Regarding those who asked me for PCBs for a true balanced version, right now I have just 4 boards for sale. I will contact the guys who wrote me by e-mail. Any questions or requests please address to macura at centrum dot cz.
Regarding those who asked me for PCBs for a true balanced version, right now I have just 4 boards for sale. I will contact the guys who wrote me by e-mail. Any questions or requests please address to macura at centrum dot cz.
I would use my stepped attenuator anyway. I have a nice 46 step now which i use in a "passive"pre amp.
So when using single ended:
1) For my pre amp, fully balanced i would need two SE boards and 1 PSU.
2) For my headphone amp i would need 1 SE board and 1 PSU
Can you also supply the matched FET's with the PCB's? How can i order?
regards,
Harold
So when using single ended:
1) For my pre amp, fully balanced i would need two SE boards and 1 PSU.
2) For my headphone amp i would need 1 SE board and 1 PSU
Can you also supply the matched FET's with the PCB's? How can i order?
regards,
Harold
I would use my stepped attenuator anyway. I have a nice 46 step now which i use in a "passive"pre amp.
So when using single ended:
1) For my pre amp, fully balanced i would need two SE boards and 1 PSU.
2) For my headphone amp i would need 1 SE board and 1 PSU
Can you also supply the matched FET's with the PCB's? How can i order?
regards,
Harold
Yes, I can sell the matched JFETs as well. Right now, even my SE PCB stock is getting empty. I will order new boards immediately after 1st of January.
To place an order, please send me an e-mail (on my web page or thru PM here /I have only e-mail PM activated/). I will let you know when the boards are produced.
Thanks,
Also interested in a balanced PCB if you decide to produce them again.
/U.
Thanks, I will let you know.
Regards,
Pavel,
did you ever use the ALPS in shunt mode with these boards. Would also be an advantage for the balanced boards, you would only need a stereo ALPS. I do this in my cross over, works very well and pot is not in signal line.
Looks like this
(+)IN---R1---------R1 ---OUT(+)
|
R2 (id needed depends on pot)
|
10k ALPS
|
(-)IN---R1---------R1----OUT(-)
regards,
PS the ALPS is now replaced by a stepped attenuator because the channel matching of the ALPS is not good enough for me.
Harold
did you ever use the ALPS in shunt mode with these boards. Would also be an advantage for the balanced boards, you would only need a stereo ALPS. I do this in my cross over, works very well and pot is not in signal line.
Looks like this
(+)IN---R1---------R1 ---OUT(+)
|
R2 (id needed depends on pot)
|
10k ALPS
|
(-)IN---R1---------R1----OUT(-)
regards,
PS the ALPS is now replaced by a stepped attenuator because the channel matching of the ALPS is not good enough for me.
Harold
Dear Pavel,
Do you have this board available at the moment? I want to build this DISPRE 2-JFET and I would order 1.
Could you send me a pm with the cost (including shipping)?
fwhahn@gmail.com
Do you have this board available at the moment? I want to build this DISPRE 2-JFET and I would order 1.
Could you send me a pm with the cost (including shipping)?
fwhahn@gmail.com
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