Just made a DIY AC adapter for 700D, followed these guides:
https://www.youtube.com/watch?v=TLeUN58gWq8
https://www.youtube.com/watch?v=IMGaj0k60dA
Edit: I used 470uF 16V Capacitor
I didn't find 7.5 Volt power adapter in local stores, I have AC to DC adapter with 9 Volt (actual output 9.25 V) 1.5A , I used three diodes to lower the voltage to 8.25 from 9.25, after I made the dummy battery and all related work (soldering, etc..) and powering on the camera, that gave me "Change Battery Pack" message with empty battery icon, So I removed one diode and it now the voltage was ~8.55, that made the camera boots with yellow battery indicator, then I removed one more diode --> this gave ~ 8.90 Volt, now the camera showed fully charged battery icon.
I can coniform 9 Volt works fine on 700D.