I've got a PIR sensor triggering a solenoid via arduino and a 2N2222 transistor. I'm running 15v into the circuit, but am only getting around 2v at the solenoid. I'm a n00b and could definately use some help in figuring out what transistor I need. I was advised to replace the 2N2222 with a relay, but the relay switches too slow. PLEASE HELP!also, the 2N2222 gets REALLY hot, so i'm quite sure i'm losing a ton of voltage to it.
Unlike FETs, NPNs and PNPs fitted in "simple" parallel do not share the load evenly. As one heats up it takes even more of the load which heats it even further until self destruction is achieved.
The ULN2803A is a high-voltage, high-Darlington transistor array. The device consistseight npn Darlington pairs thathigh-voltage outputs with common-clamp diodes for switching inductive loads.collector-current rating of each Darlington500 mA. The Darlington pairs may be connectedin parallel for higher current capability.