/diy/ - Do It Yourself

>>1402772
Magnets won't hurt those at all, they're just doped silicon and copper and gold. If an IC has a magnetometer inside it it might make a difference, however.

>>1402792
There's no point in running a transistor in common-collector mode if you're not limiting the base current, and even if you are you're not going to want to rely on the hFE of a transistor remaining stable.

By running your collector to ground in the left image you're not using it like a transistor at all but rather you'd be shorting the voltage source to ground through the b-c "diode", and passing way too much current through the LED if the transistor can handle those conditions (which it can't). On the right image you'd have a somewhat limited current through the LED (provided the base voltage is lower than the collector voltage), but this current is highly dependent on the behaviour of the LED.

Use a common-emitter arrangement with a current-limiting resistor in series with the LED instead of common-collector, provided you just want to switch the LED on and off.