Faiyaz
New Member
I tried building a ZCD (zero crossing detector) making use of the 741 opamp.
The supply provided by me was +15V and GND to pin 7 instead of negative voltage.( I wanted to make use of single supply).
The problem occuring is that the o/p of opamp saturates and does not change its state when the input sine wave crosses zero.
On replacing the GND at pin 7 by a -15V supply the ckt is working perfectly.
I would like to operate the ZCD using a battery source ( single supply source)
Please suggest any modifications necessary.
The ckt has been attached.
The supply provided by me was +15V and GND to pin 7 instead of negative voltage.( I wanted to make use of single supply).
The problem occuring is that the o/p of opamp saturates and does not change its state when the input sine wave crosses zero.
On replacing the GND at pin 7 by a -15V supply the ckt is working perfectly.
I would like to operate the ZCD using a battery source ( single supply source)
Please suggest any modifications necessary.
The ckt has been attached.