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Op-amp comparison (op07-TLE2027-op177)?????

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Sonnet2009

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Dear all
Hi, I've used op- amps "TLE2027", and "op07" in my design to make a frequency selective amplifier with gain of 30 dB and BW of 20HZ (0.05-20 Hz). During tests I found out TLE2027 have no response to my design so I've replaced it with OP07 and it immediately worked. On the other hand at first I've considered working with op177 but as I need to have POSITIVE supply voltage (+5 and GND) I changed the design and considered TLE2027 & OP07.
Now the thing is my circuit it working, but I've no idea why!! because I've been told by technician to use them,and when I asked him the reason he just knows it through his experience.
I'm reading their datasheets now, but they are not helpful.
Any idea would be appreciated :-?
 

Without seeing your circuit it is impossible to say. For a circuit to stop working completely it is possibly an input common mode range or output voltage range issue.

Keith
 

A supply voltage of only +5V may be not enough power (equivalent to +/- 2.5 volts). Many opamps require at least +/- 5 volts (or +10V).
 

A supply voltage of only +5V may be not enough power
Click to expand...
Neither TLE2027 nor OP07 are specified to work from a 5V supply. OP177 is, but the common range may be unsuitable though.
I'm reading their datasheets now, but they are not helpful.
Click to expand...
In other words, you don't know what they are talking about? You should try to identify at least some basic parameters like recommened operation conditions, input and output voltage range. They are usually told even in a selection table.

As said, your circuit (and possibly a specification of intended properties) would allow to select a suitable OP. In case of doubt, I would start with a 5V rail-to-rail OP.
 

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