| Electronics > Beginners |
| 🤪 Help with Crappy USB Isolator |
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| Lord of nothing:
THX for replay. --- Quote ---If it's cheap oscilloscope, you are unlikely to see any difference. --- End quote --- Sorry I forgott to tell its an SDR. I see when my Laptop is connect to the "original" Lenovo Powersupply a lot of noise. --- Quote ---Unfortunately they will also couple high frequency ground noise. --- End quote --- Is there an way to mod it to keep the noise away from the Laptop? Its from 2Mhz to at least 20Mhz (Range of my SDR with Up converter). --- Quote ---Yes, the black box is an isolated DC-DC converter. --- End quote --- I guess on both sides are Coils? --- Quote ---I am not aware of any single chip USB High speed solutions at the moment. --- End quote --- The SDR work with that. I dont know what the speed of the SDR is. I just need a clean signal. |
| wraper:
Try removing black DC/DC converter and both blue capacitors. However it's not guaranteed to provide any improvements. You also could try using USB cables with ferrite chokes if not using them already (note that some cheap cables have fake ferrite rings co them which are actually molded plastic with nothing inside). You also could just take some ferrite ring and making a few turns of USB cable through it. |
| Gyro:
Agreed, removing the Isolated DC-DC converter and two blue caps, might yield the quieter result. It depends though whether the DC-DC converter is noisier than the buck regulator for the external power jack or not. Do a search for the ADuM4160 / ADUM3160 Eval board datasheet for a bit more info. |
| HB9EVI:
Aside from the RF issues my guess is that it doesn't support hispeed usb (480mbps) - so no way to run SDR data over it; they are just not working with 12mbps only easier to achieve is galvanic separation between antenna and SDR, at least if it's for reception only... |
| magic:
OP's link does say --- Quote ---Datentransferrate bis zu 480 Mbps --- End quote --- Perhaps it's :bullshit: though. Test it with a USB 2.0 pendrive, I ugess. If you are already modding it, no problem with removing and bypassing the internal step-down converter. The external PSU will need to be exactly 5V then. That's if the goal is noise. If it's about protection from lightning strikes to the antenna, it may be cheaper to use a sacrificial single board computer like RasPi to run the acquisition process and transfer captured data over WiFi. But I guess you have already bought that device, so... |
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