Wireless headphones with hum help

[ivtec]

Hi guys i bought this wireless head phones,it works ok with batteries but it also has an input for 4.5 v dc power supply but it did not come with it,i have a few dc power supply i connect any of them and sound coming from the TV or any audio source has a background ground hum, and even don't need to be connected to source ,as long as i connect it to a Dc regulated power supply ,is there anything i can do to over come this annoying hum riding with sound,it also has a few radio FM channels that don't do that only with audio source or without audio ? also with 2 ,1.5v batteries in the
set doesn't do it,but it eats batteries real fast , thanks in advance and have a marry Christmas



https://www.walmart.com/ip/Professio...phone/39461871

 

[ivtec]

Update on the audio hum when connecting power supply ,i use an old PC power supply 5v dc and audio is much better .