As per as my knowledge following are universities approved by the All India technical Education, New Delhi that offering the diploma in electronics course.

Prof.G.Ram Reddy Centre for Distance Education ,
Osmania University,Hyderabad,
Andhra Pradesh

Guru Jambheshwar University of Science and Technology
Hisar-Delhi Bypass, Hisar, Haryana 125001 ‎
0166 226 3295 ‎•

GITAM Centre for Distance Learning ,
GITAM University,
Vishakapatnam,
Andhra Pradesh

D.Y. Patil University
Plot no 50 , Sector 15, CBD Belapur, Navi Mumbai, Maharashtra 400614 ‎
022 3948 6000

KARPAGAM UNIVERSITY
NH 209, Kollegal Main Rd, Coimbatore, Tamil Nadu 641021 ‎
0422 647 1115 ‎•

St.Peter's University
Konicalla Camp Road, Avadi, Chennai, Tamil Nadu 600054 ‎
044 2655 8080 ‎

Sam Higginbottom Institute of Agriculture Technology and Sciences
National Highway 27, Mahewa East, Allahabad, Uttar Pradesh 211007 ‎
0532 268 4781 ‎•

Jaipur National University
Jaipur-Agra Bypass, Near New RTO Office, Jagatpura, Jaipur, Rajasthan 302017 ‎
0141 275 4399

Subharti College of Distance Education,
Swami Vivekanand Subharti University,
Meerut,
UP

Hyderabad Central University
Prof CR Rao Road, Gachibowli, Hyderabad, Telangana 500046 ‎
040 2313 0000 ‎•