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Related Manuals for ECdesigns PowerDAC-R
Summary of Contents for ECdesigns PowerDAC-R
- Page 1 PowerDAC-R User Guide 1 16 © 1990-2021 - All Rights Reserved - ECdesigns...
- Page 2 Introduction The PowerDAC-R is a discrete multi-bit DA converter without -any- amplifiers or buffer circuits in the signal path. Balanced power-supply and resistor attenuator are used to generate the output signal. The PowerDAC-R is intended for driving amplifiers and headphones.
- Page 3 Theory of operation - Block diagram 3 16 © 1990-2021 - All Rights Reserved - ECdesigns...
- Page 4 7 + 15 = 22 switches in total. This way we can generate highly accurate and consistent audio signals on the RCA output without requiring any active conversion, amplifier or buffer circuit. 4 16 © 1990-2021 - All Rights Reserved - ECdesigns...
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Page 5: Technical Specifications
Optional available as separate product: RCA35 cable RCA to 3.5mm cable PowerDAC-R and The PowerDAC-R makes it possible to directly drive many headphones (32 Ohm and up) without any analogue amplifier or buffer in the signal path. In other words the headphones headphones are directly driven by a balanced power supply, a number of digital on / off... - Page 6 Volume 0 2.8Vpp -27dB 1 4.4Vpp -24dB 2 2.8Vpp -21dB 3 4.4Vpp -18dB 4 2.8Vpp -15dB 5 4.4Vpp -12dB 6 2.8Vpp -9dB 7 4.4Vpp -6dB 8 2.8Vpp -3dB 9 4.4Vpp 6 16 © 1990-2021 - All Rights Reserved - ECdesigns...
- Page 7 "P" when test wav file is received by the PowerDAC-R without perfect tester modification. Auto-mute When no Toslink data is received the PowerDAC-R will switch to muting after about 15 minutes. When Toslink data is received again the previous volume setting will be restored. DAPI firmware The DAPI firmware can be updated using the USB socket and jumper setting...
- Page 8 Download and unzip the bit-perfect test wav files using this link: pd-bitperfect-wav-files.zip * There is not enough CPU power left to check sample-rates > 96kHz If you bought a PowerDAC-R before October 2021 you will need to do a firmware upgrade to be able to use the bit-perfect test. 8 16...
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Page 9: Jumper Settings
Jumper settings Below are the jumper settings for PowerDAC-R. The fixed output jumper setting fixes PowerDAC-R output to volume level 9. Carefully remove or place jumpers using tweezers. 9 16 © 1990-2021 - All Rights Reserved - ECdesigns... -
Page 10: Firmware Update
Now connect a USB cable from the PowerDAC-R to your computer and start the STM32CubeProgrammer. Note: do not use the blue USB cable to connect the PowerDAC-R to your PC as this cable only has 2 wires for power only and does not support firmware update ! 10 16... - Page 11 Press the OK button on message window. Finally click on the Disconnect button to finish session. You can then close the STM32CubeProgrammer. Remove the USB cable between PowerDAC-R and PC. Set jumpers to the normal positions. After power-up PowerDAC-R the new firmware is used.
- Page 12 Note: do not use the blue USB cable to connect the PowerDAC-R to your PC as this cable only has 2 wires for power and does not support firmware update ! Now copy the firmware file (see page 10) e.g. PDRS140.bin into the same directory containing the dfu-util executable.
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Page 13: Ir Remote Control
• Decrease volume • Mute/Un-mute The IR Remote Control can be recharged with the included USB mini cable. Connect to a 5V source like PC or 5V USB charger to charge. 13 16 © 1990-2021 - All Rights Reserved - ECdesigns... - Page 14 The UT96 is an optional USB to Toslink converter that can be used with the PowerDAC-R. It supports USB full-speed 44.1kHz / 48kHz / 88.2kHz / 96kHz. Use standard USB cable to connect to PC/Host. 14 16 © 1990-2021 - All Rights Reserved - ECdesigns...
- Page 15 Bit shifts only drop bits from the 4 least significant bits. We use 2 voltages in the PowerDAC-R giving a total of 10 volume steps of 3 dB. We use 5 voltages in the PowerDAC-S giving a total of 13 volume steps of 3 dB.
- Page 16 If you are looking for simple music player for stand-alone or even multi-room to use with the PowerDAC-R checkout piCorePlayer. When run from an RPI4 you could connect your music to the RPI4 directly by USB or to NAS via network.
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