/diy/ - Do It Yourself

>>1902895
>>1902903
If it is just a switch that carries current in one direction however, you just want a simple BJT or MOSFET. If you're switching more than 100-500mA or so I'd use a MOSFET, else use a BJT. You want to use common-emitter / common-source configuration, i.e. your NPN goes on the low-side or your PNP goes on the high-side. Note that a high-current MOSFET won't turn on fully at only 5V, which matters if you're switching 10s or 100s of volts.

How much current can you pull from S? Because BJTs (NPNs and PNPs) take base current to turn on, say 50-200 times less current than the maximum being switched. MOSFETs on the other hand don't consume any current through their gate.
Also how much current does your load have?
>inb4 you just want to short 0V to 12V