thanks kai, that buffer is the reason i used 723. it has an on chip buffer, a temp compensated voltage ref and,pass transister (my case i leave it unconnected), and a current limiting circuitury also left alone. but i thought not neccessorily this voltage ref is best in the universe. frankly speaking i never had any degree in electronics and its all self study. so lack of practical and some times theoritical knowledgw may be there. i've done my masters in computer science.


abhishek