Op Amp Current Supply - Is 3 Amps Too Much?

[m718]

Do opamps have current limit, I have an OP-27 dual supply connected to 2 9V batters the battery measures 3 Amps and 16 volts is this too much current?

 

[berkeman]

Do opamps have current limit, I have an OP-27 dual supply connected to 2 9V batters the battery measures 3 Amps and 16 volts is this too much current?

There is some circuit problem. The OP27 is a standard opamp, so it will not draw or drive currents much over a few 10's of milliamps.

http://www.analog.com/en/other/militaryaerospace/op27/products/product.html

Check the power connections (maybe the +/- supplie connections are reversed?). Also, be careful to take usual ESD/handling precautions, as touching a powered-up exposed circuit can cause latchup.

When you power up your circuit (assuming the 9V batteries aren't dead by now), what gets hot?

 

[m718]

There is some circuit problem. The OP27 is a standard opamp, so it will not draw or drive currents much over a few 10's of milliamps.

http://www.analog.com/en/other/militaryaerospace/op27/products/product.html

Check the power connections (maybe the +/- supplie connections are reversed?). Also, be careful to take usual ESD/handling precautions, as touching a powered-up exposed circuit can cause latchup.

When you power up your circuit (assuming the 9V batteries aren't dead by now), what gets hot?

resistors I put on the + supply got hot anything less than 10k just burned

 

[berkeman]

Can you post your schematic? Something in the middle must be hooked up wrong. If you do not load the opamp, are the currents small?

 

[m718]

Can you post your schematic? Something in the middle must be hooked up wrong. If you do not load the opamp, are the currents small?

Its a very simple 2 opamp circuit so it must be the op amps I will replace them.

 

[m718]

But my opamps were brand new, when I connect the batteries to the opamp circuit I connect the ground first then + then -, is this ok or is it damaging the amps?

 

[berkeman]

But my opamps were brand new, when I connect the batteries to the opamp circuit I connect the ground first then + then -, is this ok or is it damaging the amps?

Not sure without a schematic. Generally you should use a DPDT switch to connect both of the rails at the same time.

 

[Mike_In_Plano]

Sounds like it's mis-wired. It's easy to run high currents through the device's substrate. For example, just reversing the power supply connections will draw a huge current, while only dropping about .6-1 volt.

-Mike