scott wurcer said:
Scott, you are dissapointing me, you should know that much 🙁 Obviously, for protecting the cables from the evil moonlight daytime radiation, a well known factor affecting the sound quality.
There are more expensive cables out there. I will wait until someone gives me a set. I have my own Bybee devices. 
john curl said:There are more expensive cables out there. I will wait until someone gives me a set. I have my own Bybee devices.
John, I'm sure those guys would give you a set if you promise to keep the actual BOM a secret.
different OLG - different sound
IMO it's really important conclusions made by Pavel. Let me guess - the version with lower OLG was with preferable sound? Lots of excellent work done here!PMA said:
Thanks 🙂 .
Yes, I prefer the lower OLG, and would like to make more listening tests during spring in different audio chains.
Yes, I prefer the lower OLG, and would like to make more listening tests during spring in different audio chains.
I have the first two pcs of PCBs rev. V3 produced. After evaluation I will start production of them, and expect they will be available since the 2nd half of February. I am also openning a paypal account, to reduce previous fees associated with standard bank transfer (wire transfer).
Hello John,
thanks, I will. The problem is that my several attempts to e-mail you in the last 3-4 weeks were refused by your server.
Thanks,
Pavel
thanks, I will. The problem is that my several attempts to e-mail you in the last 3-4 weeks were refused by your server.
Thanks,
Pavel
toole reg
http://www.diyaudio.com/forums/showthread.php?s=&threadid=134387&perpage=25&pagenumber=1
This seems to be a high performance shunt regulator. There is a group buy for PCB's going on which has only the last hours to go. It can be installed from 15V to 30 V and uses easy to get bipolars.
Can it be used for the dispre ?
How many mA is the dispre asking ?
http://www.diyaudio.com/forums/showthread.php?s=&threadid=134387&perpage=25&pagenumber=1
This seems to be a high performance shunt regulator. There is a group buy for PCB's going on which has only the last hours to go. It can be installed from 15V to 30 V and uses easy to get bipolars.
Can it be used for the dispre ?
How many mA is the dispre asking ?
The Dispre PCB board (2-channel, stereo) has supply current of +/- 60mA at standard line level loads (5k and more). It can ask more when used as a headphone amp.
New, revision V3 PCB boards, will be produced and available in the middle of February.
New, revision V3 PCB boards, will be produced and available in the middle of February.
Above mentioned groupbuy of high quality powersupply is still possible. There is a wiki. Jan Didden is making the design even better at this moment.
Good, low noise power supply is highly recommended. I have made both measurements and listening tests with different power supplies, and it makes difference.
This is best seen in open-loop measurements. I would like to show a difference.
1st measurement, now attached, is Dispre2 openloop (i.e. gain 31.9dB approx) with conventional7815/7915 power supply. Also, 100R+1000uF filter for input stage has been removed, to see the difference clearly.
This is best seen in open-loop measurements. I would like to show a difference.
1st measurement, now attached, is Dispre2 openloop (i.e. gain 31.9dB approx) with conventional7815/7915 power supply. Also, 100R+1000uF filter for input stage has been removed, to see the difference clearly.
Attachments
