Hi all,
I have one of these nice DAC boards:
They say the analog supply voltage shall be +-12V. But AFAIK, the PCM1794A only sees the digital 5V supply voltage, while the maximum analog voltage is mainly determined by the op amps. So, if I'm using NE5532/34 op amps, +-17V should be safe.
Can anyone confirm this?
Thank you!
I have one of these nice DAC boards:
They say the analog supply voltage shall be +-12V. But AFAIK, the PCM1794A only sees the digital 5V supply voltage, while the maximum analog voltage is mainly determined by the op amps. So, if I'm using NE5532/34 op amps, +-17V should be safe.
Can anyone confirm this?
Thank you!
Did you get this working? How does it sound?
There are two regulators next to each dac chip to produce 3.3v from the 5v supply. It doesn't need a 12v supply.
The 12v is for the opamps.
There are two regulators next to each dac chip to produce 3.3v from the 5v supply. It doesn't need a 12v supply.
The 12v is for the opamps.
Yes, it's working nicely.
If I remember correctly, the 5V supply for the DAC chips is powered by the +12V input. So, the 12V supply cannot be raised to 17V without the risk of destroying the regs.
Therefore, I simply removed the 5V regs and connected the 5V input voltage directly to the former output pin of these regs. With this mod, I could increase the +-12V to +-17V.
I did not do this for sound reasons, and I do not think it makes a big effect. But I didn't do measurements. The modding was done for easier integration into my setup.
Cheers!
If I remember correctly, the 5V supply for the DAC chips is powered by the +12V input. So, the 12V supply cannot be raised to 17V without the risk of destroying the regs.
Therefore, I simply removed the 5V regs and connected the 5V input voltage directly to the former output pin of these regs. With this mod, I could increase the +-12V to +-17V.
I did not do this for sound reasons, and I do not think it makes a big effect. But I didn't do measurements. The modding was done for easier integration into my setup.
Cheers!
Thank you. I've ordered one without the opamps as I plan to use my Sowter I/V transformers which are designed for balanced dacs.
According to the listing, there's one dac for each channel. I assume they are set for L and R with the Mono, CHSL, FMT0 and FMT1 pins suitable configured?
This means I won't need the 12v input if the 3.3v is derived from the 5v connection.
I am using it to replace (maybe only temperorarily!) the audio board in a recently acquired VRDS10. This uses a par of TDA1547/ DAC7 bitstream dacs and conveniently, the digital data signals and psu conenctions are via 0.1" pins. It receives two separate AC supplies, each regulated to +- 12 & +-5v respectively with 7805/7905/7812/7912 regs.
Either way, I can make my own low noise supplies from these two AC rails.
According to the listing, there's one dac for each channel. I assume they are set for L and R with the Mono, CHSL, FMT0 and FMT1 pins suitable configured?
This means I won't need the 12v input if the 3.3v is derived from the 5v connection.
I am using it to replace (maybe only temperorarily!) the audio board in a recently acquired VRDS10. This uses a par of TDA1547/ DAC7 bitstream dacs and conveniently, the digital data signals and psu conenctions are via 0.1" pins. It receives two separate AC supplies, each regulated to +- 12 & +-5v respectively with 7805/7905/7812/7912 regs.
Either way, I can make my own low noise supplies from these two AC rails.