I am working on a sound application project for my model railroad and have a questions regarding the DC power supply requirements.
Based on the documentation, when 5VDC input is required, I need to utilize two (2) 1N4001 diodes in series which are connected to one of the two DC input pins. Not sure why but OK that is what I will do. However, if I have the unit connected to my 5VDC supply and the USB plugged in at the same time is their any conflicts or potential damage to the unit or the PC?



The unit is a WT588D-U


Thank you for your response
Brian Krupicka USA

 

The two diodes (in series) are to drop the voltage from 5 V to about 3.6 V; each diode drops about .7 V depending on loading.

As to the potential for problems with the simultaneous connection to the PS and the USB, it is not likely, but frankly I can't read the schematic well enough to be certain.

 

The sound level from an amplifier/speaker with a supply voltage of only 4.2V is tiny.