Cayin RU7: 1-Bit Resistor Network Dongle DAC /Amp

[giuca70]

For Twieester6
did you check the overcharge with a usbc tester?
What you say is always like this, but if the TC28CPro is involved, I guarantee you that the current is not stopped, but continues to supply current at 1.9 amps, despite the mobile phone or tablet saying "charge completed". Also another 5 minutes... I do not more... wrong charge is....
Same thing analyzed without the DDHIfi the current decreases to 0.2 Ampere as soon as the charge is complete.
It doesn't seem the same to me, so if I have given the alert, it is to protect you from the explosion of the battery due to overcharging with this TC28Cpro.
I don't usually write bull at random....

 

[Polky74]

Just look at this diagram to understand that there is no data exchange between the charger and the smartphone and therefore there is no one to limit or block it once the maximum charge is reached.

 

[giuca70]

@Polky74 Exactly.

Wrong Charge - Warning see here

 

[twister6]

@Polky74 Exactly.

Wrong Charge - Warning see here

Did you try it with a different smartphone? I know you are only using Moto with original charger. You do have a point because I noticed that connected directly to my Anker charger it was doing fastcharging at 9V, but through TC28CPro, it was charging at 5V, just a regular default charging. But, your phone is sinking the current from a charger that is sourcing it, and often it is up to your phone battery management to enter trickle charge mode. I can only speak for Galaxy S22.

 

[giuca70]

Ok,
I specify all the tests carried out:
all types of chargers (PD 3.0, QC 4.0, standard, IQ 3A) with Lenovo and Moto tablets, via usbc.
The PD3.0 charger alone runs at 9 Volts and 2.2A
The PD3.0 charger if you connect only the ddHifi sets 5 Volts 0 Ampere, the ddHifi forces it to 5 Volts.
If you then connect the ddHifi to the Moto or Lenovo, once you reach 100%, the charge continues undeterred in spades with 1.9 Ampere, always.
So.... ddHifi needs to correct this problem.
They are 2 different devices, same problem with all type of charger..
It is one thing to say that it sets 9 volts in PD and then goes to 5 Volts, another thing is to say that the current supplied is always 1.9 amperes, whatever the state of the battery.
Over and out, if you don't want to understand, read the electrical specifications of the PD and the handshaking systems between host and device.
The writer is a computer systems analyst who knows all systems, electrical, electronic, computer, and how they work.
It is not a naive you have in front of you, unfortunately.
End last, yes I try to test all situation n all condition, also power bank with PD or IQ or QC. All type of all genre.

 

[Andykong]

,

Ok,
I specify all the tests carried out:
all types of chargers (PD 3.0, QC 4.0, standard, IQ 3A) with Lenovo and Moto tablets, via usbc.
The PD3.0 charger alone runs at 9 Volts and 2.2A
The PD3.0 charger if you connect only the ddHifi sets 5 Volts 0 Ampere, the ddHifi forces it to 5 Volts.
If you then connect the ddHifi to the Moto or Lenovo, once you reach 100%, the charge continues undeterred in spades with 1.9 Ampere, always.
So.... ddHifi needs to correct this problem.
They are 2 different devices, same problem with all type of charger..
It is one thing to say that it sets 9 volts in PD and then goes to 5 Volts, another thing is to say that the current supplied is always 1.9 amperes, whatever the state of the battery.
Over and out, if you don't want to understand, read the electrical specifications of the PD and the handshaking systems between host and device.
The writer is a computer systems analyst who knows all systems, electrical, electronic, computer, and how they work.
It is not a naive you have in front of you, unfortunately.
End last, yes I try to test all situation n all condition, also power bank with PD or IQ or QC. All type of all genre.

I think we are way outside the RU7 Dongle DAC discussion already. Besides ddHiFi might not feel comfortable to respond or discuss with you in Cayin product thread. May I suggest you clarify your concern with ddHiFi by starting a new thread and inviting ddHiFi to clarify your concern or gathered all your arguments, measurement, and photo and share your concern in one of the ddHiFi product threads?

 

[giuca70]

Ru7 is fine. Pardon mr. Andykong. I have 2 product of Cayin, RU6 and now RU7, both are wonderful dac/amp.
I started my opinion with RU7 and AllToDsd i know is fine and exquisite. Can I change sound, with this option.
With efficient 1More triple driver gold, 64 is (for me) the best.
Thanks, love this product.
My congratulations.

 

[Earbones]

Review of the RU7 from another Andy:

Weird that he rates the RU7 and iFi Go Bar as having the same power output.

 

[jsmiller58]

@Polky74 Exactly.

Wrong Charge - Warning see here

@giuca70 and @Polky74 I am grateful for the warning as I am expecting the TC28CPro to arrive today. I will use it, but keep an eye out for the charge level.

@Andykong, yes, this topic is probably a bit far afield of the RU7, but still somewhat relevant as dongles do impact the battery levels in the devices they are attached to and owners are looking for solutions.

 

[Polky74]

@Andykong have you tried to connect a RU6/RU7 to this?

https://en.cayin.cn/features/7/59/582.html

How does driving a Sennheiser HD800S change compared to using a C9?
Thank you.

 

[skeeb23]

I've been listening to the RU7 for a couple of days now that I'm back from CanJam. So far impressions are positive! I'm comparing as I can with the Go Bar as I personally love the Go Bar. Lot's more testing to do and so far differences are very minute. So far...

 

[Andykong]

@giuca70 and @Polky74 I am grateful for the warning as I am expecting the TC28CPro to arrive today. I will use it, but keep an eye out for the charge level.

@Andykong, yes, this topic is probably a bit far afield of the RU7, but still somewhat relevant as dongles do impact the battery levels in the devices they are attached to and owners are looking for solutions.

It is relevant to Dongle DAC in general, no one is arguing against that. Since giuca70 has started a new thread and Polky74 has posted the link in Post #1,203, we should move the discussion to the new thread instead of keeping the issue in RU7 thread.

 

[Andykong]

@Andykong have you tried to connect a RU6/RU7 to this?

https://en.cayin.cn/features/7/59/582.html

How does driving a Sennheiser HD800S change compared to using a C9?
Thank you.

I haven't tried RU7 as a source to an HA-3A tube headphone amplifier.

Technically, you can connect RU7 to a headphone (portable or desktop) or speaker amplifier without any problem when you set RU7 to line-out mode. Search C9 in this thread and you'll locate pages of comments and impressions with RU7 and C9. In addition, if you are interested in RU7+HA-3A, maybe you can raise the question to everyone in this thread or give it a try in the HA-3A thread. Addressing the question to me will only narrow down the response you received to your question.

There are a lot of discussions covering RU6 to portable and desktop headphone amplifiers in the RU6 thread. Although Cayin didn't recommend this application in view of the thermal noise pattern of RU6, we have offered suggestions and settings to use RU6 phone out as line out in the RU6 thread, and many users have tried our suggestion with good results.

As a sponsor of Cayin, I always try to avoid quoting my personal subjective assessment of Cayin products, definitely not a good idea when many users and reviewers have offered their opinion already. Please refer to the sharing of other users and reviewers, their collective opinions are impartial and more valid in my opinion.

 

[inscythe]

Ok,
I specify all the tests carried out:
all types of chargers (PD 3.0, QC 4.0, standard, IQ 3A) with Lenovo and Moto tablets, via usbc.
The PD3.0 charger alone runs at 9 Volts and 2.2A
The PD3.0 charger if you connect only the ddHifi sets 5 Volts 0 Ampere, the ddHifi forces it to 5 Volts.
If you then connect the ddHifi to the Moto or Lenovo, once you reach 100%, the charge continues undeterred in spades with 1.9 Ampere, always.
So.... ddHifi needs to correct this problem.
They are 2 different devices, same problem with all type of charger..
It is one thing to say that it sets 9 volts in PD and then goes to 5 Volts, another thing is to say that the current supplied is always 1.9 amperes, whatever the state of the battery.
Over and out, if you don't want to understand, read the electrical specifications of the PD and the handshaking systems between host and device.
The writer is a computer systems analyst who knows all systems, electrical, electronic, computer, and how they work.
It is not a naive you have in front of you, unfortunately.
End last, yes I try to test all situation n all condition, also power bank with PD or IQ or QC. All type of all genre.

Was your phone turned on? The phone still needs electricity when it is on, so if it is not taking it from the battery, it will take from the charger. You can use some battery monitoring app like Ampere to check whether the battery is indeed charging or not rather than taking the power input from the USB. Anyway, like @Andykong mentioned, we should move this to the other thread. I also replied to your thread.

 

[Earbones]

Just received my RU7 today. Initial listening is very promising. I’ll be posting some thoughts on the RU7 versus the iFi GOld Bar after a bit more listening.