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The 741 op-amp is speced for a maximum of about 20mA sink or source current. Normally, you would use the op-amp output to drive a transistor that can conduct much higher currents. However, a 12 volt reed relay from Radio Shack has a coil resistance of 1000 ohms. It only needs 12 mA of current, which is fine for the 741's output.
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