Hi,
Have a simple Arduino project, externally powered by a transformer based wall pack, but it can be connected via its usb serial link to the PC for data feedback and it all worked fine until I replaced the external power pack with one of these internal switch mode units, similar to the pic below.
Everything on the Arduino still works ok, but when the usb serial link to the pc is connected, the PCs programs screens display from the wired video security cameras have some horizontal interference bands which slowly moved down the screen.
Any suggestions of what type of filter is needed to overcome the problem and where best to place it, by the psu or more the pc end of the cable ?
thanks
Have a simple Arduino project, externally powered by a transformer based wall pack, but it can be connected via its usb serial link to the PC for data feedback and it all worked fine until I replaced the external power pack with one of these internal switch mode units, similar to the pic below.
Everything on the Arduino still works ok, but when the usb serial link to the pc is connected, the PCs programs screens display from the wired video security cameras have some horizontal interference bands which slowly moved down the screen.
Any suggestions of what type of filter is needed to overcome the problem and where best to place it, by the psu or more the pc end of the cable ?
thanks