current amplification

I have a flash gun which runs off 2 AA batteries. They drain very quickly. The flash unit lives in the same spot all day, so I would like to swap the AAs for a plug-in solution (the flash unit does not offer this). I took a chance with some 'dummy AA' cells, which are basically empty shells...

Hello everyone! I'm looking for a circuit that amplifies the current for a 12v input so it's strong enough to trigger a relay coil. Here's the scenario I've got going: Recently i purchased a smoke detector and was planning on wiring it to my security system but the detector made the system...