i'm a new member ,i need ckts of zero crossing detector &sawtooth generator using opmps op07 only . i'll be grateful if sum1 can really help me out on this matter

 

http://www.google.com/search?hl=en&q=%2B%22zero+crossing+detector%22 will show you about 96,000 responses to "zero crossing detector"

http://www.google.com/search?num=10...t=result&cd=1&q=+"sawtooth+generator"&spell=1 shows about 28,000 responses for "sawtooth generator"

Have fun researching.

 

Sawtooth generator: a current mirror charging a capacitor, and a comparator discharging it. Try the LM555 with a current mirror.