The op amps on this circuit look correct but where the offsets usually are its labeled v+ and v- which do i use. i am using the 8 pin tlo81cp op amps ...thanksView attachment pirdetect.pdf
The op amps on this circuit look correct but where the offsets usually are its labeled v+ and v- which do i use. i am using the 8 pin tlo81cp op amps ...thanksView attachment 24366
where the supply pins are labels on the schematic in reference to the op amps in all schematics that Ive seen referred too the offset n1 and n2 but in this schematic the side branches of the op amp symbols are labeled v+ and v- is that in reference to the supply pins or just the inputs needed to go to the offsetsView attachment op amp symbol.doc...thanx again
where the supply pins are labels on the schematic in reference to the op amps in all schematics that Ive seen referred too the offset n1 and n2 but in this schematic the side branches of the op amp symbols are labeled v+ and v- is that in reference to the supply pins or just the inputs needed to go to the offsetsView attachment 24367...thanx again
v+ is the positive power supply pin 8 of the dual opamp and pin 4 is the negative power supply pin 4. The dual opamp is in an 8 pins package and does not have input offset adjust pins.
Since you are using single opamps then look on its datasheet to see which pin does what.
The TL081 is completely different from the opamps in the circuit and might not work.
The original opamps have inputs that work perfectly at 0V. The TL081 has inputs that have the phase-inversion problem when their voltage is within 3V of 0V.
The original opamps have outputs that go to 0V. The TL081 has an output that does not go to 0V but stops at +1.2V.