ECdesigns PowerDAC-B User Manual Download | Manualshive

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Theory of operation - Block diagram

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Summary of Contents for PowerDAC-B

Page 1: ... 1990 2022 All Rights Reserved ECdesigns https www ecdesigns nl 1 15 PowerDAC B User Guide ...

Page 2: ...resistor attenuator are used to generate the output signal The PowerDAC B can be used with an ampli fi er or with headphones using a resistor based passive volume control connected to the two RCA connectors on the back Highlights Custom DAPI receiver o ff ers high source immunity Toslink input Connect to pre ampli fi ers using RCA Connect to headphones using RCA and resistor based passive volume c...

Page 3: ... 1990 2022 All Rights Reserved ECdesigns https www ecdesigns nl 3 15 Theory of operation Block diagram ...

Page 4: ...ries are short circuit for AC So output impedance in all 3 cases remains the same 31 25 R By changing the electronic switch settings we can have no voltage positive voltage or negative voltage on RCA output But we need to program the voltage much more precisely for generating audio signals Therefore we use 22 electronic switches and resistors with different values resistor array Now we can program...

Page 5: ...r Supply Cable Included with PowerDAC B Output impedance 31 25 Ohms Volume control The PowerDAC B has a fi xed 4 Vpp 1 4v rms output Output voltage The PowerDAC B has a fi xed 4 Vpp 1 4v rms output Output 2 x RCA output PowerDAC B and headphones The PowerDAC B makes it possible to directly drive many headphones 32 Ohm and up without any analogue ampli fi er or bu ff er in the signal path use a pas...

Page 6: ... 1990 2022 All Rights Reserved ECdesigns https www ecdesigns nl 6 15 PowerDAC B PAGE 2 POWER Output Voltage shifts attenuation in dB Volume 4 4Vpp fi xed 0 dB Technical speci fi cations ...

Page 7: ...ww ecdesigns nl 7 15 PowerDAC B PAGE 3 DAPI fi rmware update The DAPI fi rmware can be updated using the USB socket and jumper setting positions for fi rmware update Dimensions Width 23cm Height 5cm depth 23cm Weight 1 5 kg Technical speci fi cations ...

Page 8: ...www ecdesigns nl 8 15 Jumper settings Below are the jumper settings for PowerDAC B You will need to remove the right plate 4 screws and then pull out the top plate to the right to access jumper block Carefully remove or place jumpers using tweezers ...

Page 9: ...ad the STM Cube programmer The email sent to you contains the Download now button to start the download Goto link below to download the STM Cube programmer Win Lin Mac https www st com en development tools stm32cubeprog html get software Download and install STM32CubeProgrammer Disconnect blue USB power cable from the PowerDAC B Use tweezers to set the red jumpers on rear of PowerDAC B to PROGRAM ...

Page 10: ... and USB cable connection Now press the Connect button Then use the Open fi le button to load the fi rmware fi le Click the Download button to load fi rmware fi le in the PowerDAC B After message File download complete Press the OK button on message window Finally click on the Disconnect button to fi nish session You can then close the STM32CubeProgrammer Remove the USB cable between PowerDAC B an...

Page 11: ...hange directory to the directory containing the dfu util executable for your operating system Disconnect blue USB power cable from the PowerDAC B Use tweezers to set the red jumpers on rear of PowerDAC B to PROGRAM con fi guration see Jumper settings on page 9 Now connect a USB cable from the PowerDAC B to your computer Now copy the fi rmware fi le see page 10 e g PDRS140 bin into the same directo...

Page 12: ...onnect to PC Host Streamer The UT192 has both optical Toslink output ElectroTos output We found that using highest sample rates some optical Toslink cables would not work Depending on the quality of the Toslink cable optical re fl ections can prevent reliable bit perfect output Therefore we also fi tted the UT192 with an ElectroTos output ElectroTos using standard S PDIF output uses an electrical ...

Page 13: ...rlinks so a suitable translator or source are required We o ff er a USB to ElectroTos translator that outputs ElectroTos ElectroTos can operate with standard S PDIF protocol compatible with existing DACs This measurement compares a high quality Toslink interlink top and the new ElectroTos interlink bottom The signal is measured inside the DAC at the Toslink optical receiver chip output sample rate...

Page 14: ... all of the 4 S PDIF inputs but by doing so we would let up to 4 S PDIF sources into the DAPI controller simultaneously Now the not used inputs that contain a live S PDIF stream will inject noise into the DAPI board even if this input is not selected The only solution to use multiple S PDIF inputs without causing extra noise injection into the PowerDAC is to move them outside the PowerDAC One poss...

Page 15: ...or the Hi fi Berry Digi HAT you can connect the PowerDAC B using a Toslink cable It supports 44 1kHz 48kHz 88 2kHz 96kHz 176 4kHz 192kHz Be sure to set Audio Volume Control to fi xed at 100 set Audio Crossfade to No Volume gain to None Then install Material Skin in LMS and choose in LMS pages under Web Interface and you will have a very nice user interface using any browser on any PC in your netwo...

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