Jimster480
Major Contributor
I think this is a topping relay click.
It happens in my DX7 also.
Nice collection, I bet you are glad the D70 stacks up
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Review and Measurements of the Topping D70 DAC
- Thread starter amirm
- Start date
It happens in my DX7 also.
Roasty
Member
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- Aug 31, 2019
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I just bought this dac for use in my office. Will be pairing it with the Drop 789 amp.
the OCD in me is going crazy with the (slightly) tilted LCD screen, similar to the review unit at the start of this thread.
has anyone gotten the new Bluetooth version yet, or some later production models, which have the LCD tilt rectified?
the OCD in me is going crazy with the (slightly) tilted LCD screen, similar to the review unit at the start of this thread.
has anyone gotten the new Bluetooth version yet, or some later production models, which have the LCD tilt rectified?
IslandMD
Member
Sorry to hear about your screen. I got mine on July 23, 2019 through Amazon and the screen is not tilted.
OP
- Thread Starter
- #845
You should be able to open the unit and shift the front PCB and with it, the display.
Roasty
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haha u r right.. why didn't I think of that?!
just popped open the front panel. couldn't shift the pcb much. but managed to straighten out the text by shifting the LCD panel in its housing. looks perfect now.
Thanks for that, Amir.
Yes, Topping have Updated D70 with BT receiver
Bounce44.1
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- Aug 24, 2019
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https://www.zenproaudio.com/zenpro-converter-test
Here is a pretty scientific test of converters. Unfortunately it costs but is refundable. Anyone planning on purchasing a RME ADI-2 in the near future? Can't share the files, bummer. Maybe elect the biggest sceptic and all pitch in. Would be very interesting!
Here is a pretty scientific test of converters. Unfortunately it costs but is refundable. Anyone planning on purchasing a RME ADI-2 in the near future? Can't share the files, bummer. Maybe elect the biggest sceptic and all pitch in. Would be very interesting!
Just found a couple of Amazon links to the Bluetooth version, if anyone is interested.
https://www.amazon.com/dp/B07XFDJS5V?tag=audiosciencer-20
Or
https://www.amazon.com/dp/B07XDYGJNB?tag=audiosciencer-20
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Topping D70 is connected to the nuforce ha-200 headphone amplifier
by RCA and a slight background noise is heard. If I change to Topping D10 this noise disappears completely. I tried to change the wires, turn off other devices, until I found a solution, the noise does not disappear.
by RCA and a slight background noise is heard. If I change to Topping D10 this noise disappears completely. I tried to change the wires, turn off other devices, until I found a solution, the noise does not disappear.
AndrewDavis
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That's strange, as you read the D70 had an extremely (read: utterly inaudible) noise floor. Could this be a ground loop?
IslandMD
Member
Yes, might be a ground loop. I had some very slight ground loop noise after I installed the D70 in my system.
The D70 has a ground pin. I lifted the ground by removing the ground pin on the power cord and success: no more ground loop noise. Lots of modern electronics have no ground pin (such as AV Receivers) to reduce ground loop issues. However, not sure how safe this is in the case of the D70. So far no problems.
Usually the ground pin is there for a reason (safety approval).
If you can do some basic soldering, there's a better way. Inside the cabinet, the safety ground pin will usually have a short wire directly to the case from the power entry module. Likewise, the signal and/or power supply boards will have some connection to the case. Trace where the latter is and either cut it (if it's a wire) or insulate it (if it's a screw to a standoff or similar). Now take two power diodes (say, 5-10 amps at 200V or higher), connect them in parallel but with one reversed (engineers colloquially refer to this as '69' mode), parallel that with a 600-1000V ceramic disk cap (value not critical, 1000pF or 1nF is typical), and wire the signal or power supply board ground to the case through the cap-bypassed diode pair. This retains the shielding properties of the case, but will break up the ground loop without compromising safety.
If the visualization is unclear, see Figure 6 of this article. The groundbreaker consists of D104, D105, and C108.
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IslandMD
Member
Great. Thanks for this. A nice, cheap solution that should work for all kinds of electronic devices that cause ground loops. I was able to find the diodes and capacitors that you described on Amazon in large batches, for cheap. My only concern is the impact this will have on warranty and resale value.
IslandMD
Member
FYI for anybody thinking of installing a groundbreaker for their D70. I just finished taking mine apart. The power entry module ground pin wire goes directly into the circuit board and not to the case. As far as I can tell, there is no grounding to the case anywhere except a connection from the circuit board to the outer barrel of the RCA coax input on the rear panel. Doesn't look like installing a groundbreaker circuit is going to work here.
Take a look at this article, it has some good background on causes and possible solutions to ground loops as well as safety issues with grounding. Section 9 shows a ground breaker very similar to what you are working on as well as some ideas on how to hook it up.
https://sound-au.com/earthing.htm
IslandMD
Member
For anyone reading this and wondering if there's something wrong with the D70, I thought I would make it clear that regarding ground loops or any other type of noise, there is nothing wrong with the D70. My minor ground loop problem is due to the home theater bypass RCA cables from my receiver that are connected to my integrated amp. When these are not connected, even when using a properly grounded cable, the D70 produces no ground loop noise whatsoever.
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