I also put a switch on the oscillator and it seems to make a huge difference. With the oscillator off, it doesn't detect the pen at all. With the oscillator on, both the 741 and the sound generator detect the pen. If I turn off the 741, it detects the pen again (how is this done). The oscillator's power cable works like an antenna and seems to be more sensitive than the small loop. When I turn on the oscillator and sound generator, I have the longest detection distance for the LED lamp I have. And for the radio I have. Once the 741 is on, the distance decreases but the sound becomes more stable. It is also very important that the battery cases are very well secured so that it doesn't make false sounds. Also, when I grab the paper box with both hands, the distance decreases again.
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