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#141 | |
diyAudio Member
Join Date: Oct 2001
Location: Denmark
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Quote:
I am going to make discrete opamp Sections that are semi symmetrical . Input will be LTP, second stage is an current mirror, followed by an buffer. This Way it will only have "single gain stage". I could make it symmetrical but complexity will grow a lot. But more will follow tomorrow morning Sent from my iPhone using Tapatalk
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Mirand Audio amps and Dac's - mirand-audio.dk |
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#142 |
diyAudio Member
Join Date: Aug 2011
Location: Aurora, Colorado
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Thanks Sonny - looking forward to it.
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#143 |
diyAudio Member
Join Date: Feb 2005
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#144 |
diyAudio Member
Join Date: Oct 2001
Location: Denmark
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The attached opamp design is the one i will use for the discrete output shield.
As we only have 100mA i total to the outputstage we will have an maximum of 15 - 20mA per opamp to be on the safe side. This opamp will rest at around 14mA. I have chosen npn bjt in the input stage as the source impedance's are relatively low, and with bjt we will get a lower offset than with JFET which for 2sk2145-BL is around 20mV. For BJT we can get down to 1/10 of that. And because of the symmetrical loading of the opamp, there is no extra offset build up by the mismatch of source impedance's. 2 opamps will be used for balanced and 1 for balanced to singleended conversion on the output per channel. BR Sonny
__________________
Mirand Audio amps and Dac's - mirand-audio.dk |
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#145 |
diyAudio Member
Join Date: Oct 2001
Location: Denmark
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Just 2 shots from volumio on pi2 with the USB DAC
__________________
Mirand Audio amps and Dac's - mirand-audio.dk |
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#146 |
diyAudio Member
Join Date: Sep 2010
Location: Montreal
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Do we have to set volumio in DoP mode for DSD or use native mode?
Thanks Do
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PREAMPs : AMB α10 + USSPA | LDR3x + USSPA | AMPs: AMB β24 | USSA5 | FSSA2 | MoFo | FC-100 | Modulus-686 | SimpelStark+ | DACs : Mirand AK4490 + Discrete Output | Speakers : Troels Gravesen ATS-4 | Sagwee LT V3 | |
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#147 |
diyAudio Member
Join Date: Oct 2001
Location: Denmark
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Yes at the moment it has to be DoP mode for DSD
Sent from my iPhone using Tapatalk
__________________
Mirand Audio amps and Dac's - mirand-audio.dk |
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#148 |
diyAudio Member
Join Date: Sep 2010
Location: Montreal
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Thanks Sonny!
This is also what I use, Pi 2 with volumio 1.55 Will start working on it soon. I'm at the Montreal Grand Prix this weekend so I put music on the side for a few days. I will be using Sigma 22 and Sigma 11 from AMB for powering the DAC. Ciao! Do
__________________
PREAMPs : AMB α10 + USSPA | LDR3x + USSPA | AMPs: AMB β24 | USSA5 | FSSA2 | MoFo | FC-100 | Modulus-686 | SimpelStark+ | DACs : Mirand AK4490 + Discrete Output | Speakers : Troels Gravesen ATS-4 | Sagwee LT V3 | |
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#149 |
diyAudio Member
Join Date: Oct 2001
Location: Denmark
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I have found a solution for changing filter. The frontpanel makes it possible. The USB DAC reads the selected filter from the front panel as well as sending the type of data stream that it receives.
We have have test an OLED display in december with 64x256 pixels. This frontpanel has IR receiver. and will be the same used for the preamp. We will make a brown colored Plexiglas front for it.. BR Sonny
__________________
Mirand Audio amps and Dac's - mirand-audio.dk |
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#150 | |
diyAudio Member
Join Date: Oct 2012
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Quote:
Please use codes for Apple remote. |
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