transistor as a switch circuit problems

Hi,

I'm trying to build a circuit with two key switches, where both key switches need to be closed for the current to go through. I am trying to use a transistor so that one key switch feeds the collector, and the other feeds the base so that both need to be on to allow current to go through the emitter. I've tried this also with a MOSFET gate-drain-source and well as a general purpose transistor with no luck. I've seen similar tutorials on youtube where a guy is using a transistor to turn a bulb on and off by touching the base to the same source as the collector with the addition of a resistor. The image is my circuit. If there are things missing in the diagram it's because i don't know that they should be there. the resistor is brown, black, black, gold which according to the web means 100k-ohms +- 5%. Can someone please show me the correct circuit? Thanks.

 

something along the lines of this but with key switches on the collector and base::

 

Hi Dave thanks for responding,

I don't know if the light is a globe or LED but it's rated at 12 VDC

http://www.sci.com.tw/PRODUCTS/ELECTRIC PARTS/(R9) INDICATOR LAMP/(R9) LED INDICATORS/R9-86L.htm

I tried a CFC4662 and a K2624 MOFSET transistor. I''m pretty sure I identified the pins correctly. G-D-S or B-C-E depending on what naming you prefer. I looked at the data sheets, maybe the voltage is too low?

 

Hey weird_dave,

These key switches are being used as safety switches in a fireworks firing system, and the effect that I'm going for is the "you need both keys to turn on the system" sorta thing. But for each key switch i would like an indicator light (not pictured in the schematic) that operates based on the state of the switch it's tied to, not the throughput of the system as a whole. The "light" in this schematic represents the remainder of the system; another couple safety toggles, and all the NO mom push switches.

So anyways, I moved the "light" to the collector side of the transistor and added the 100k (brn\blk\red) resistor as davenn suggested and the system works as intended. Below is the schematic. Maybe there's still something wrong and it's working by fluke?

 

@ davenn yes 1k sorry. I was tired when i finally got it working

@ weird_dave Yes those squiggly things are lamps haha. It was quick in photoshop. My bad for their positioning as the key switch doesn't have 3 posts. They are off the right side in the circuit. So yes they are only on when the corresponding key switch is thrown. As for the diodes; shouldn't they be necessary because of the common ground, and you don't want current going back up the circuit the wrong way? The whole water in pipes analogy i think only works for some things.