Simple emergency lighting system

I initially thought up this power loss switch to activate a tracking signal on electronics which didn't get created yet (but the idea is announced here so it is mine first!). Even though the system is very simple it only needs limited parts I took it a bit further by adding a nihm rechargeable battery pack that I made; that recharges when the power is on (and the relay is energized). I also added a led to indicate that the relay is energized.

I hope you enjoy and even get ideas from this instructable.

Step 1 Do not fear

after looking at this schematic try not to get sad or confused, trust me I designed this circuit and I got very confused when soldering it together.

here is the parts list for the simple switch:
1 - dc power source (I used an unregulated 12v wall adaptor, I measure 17v when in use)
1 - single pole double throw 12v relay
1 - generic diode
1 - momentary normally open push switch
1 - LED
1 - 2.2k resistor

for the recharge circuit as well you need:
1 - 390 ohm resistor

these depend on your actual input voltage
1 - 10 ohm resistor
1 - 12 ohm resistor
17 - 1n914 diodes (I measured a voltage drop from 0.65v to 0.7v each)


a multimeter is a must you need to check input voltage from power supply and charge current