Automatic emergency light
The emergency light that are presenting now works with an accumulator (battery), 6-volt car, or whether they should use 6-volt lights, the number of these depends on the wattage they consume.
It consists of 2 transistors in darlington configuration and act as autoloader in conjunction with T1, D1 and D2. When the current lack home, the relay contact closes and activates the battery and turn on the lights.
S1 and S2, whatever serves to ignite any of the lights to save energy, keeping only the necessary turn.
D3 and D4 act as a protector against short circuits.
List of components :
C1: 220 volts µF.electrolítico 25
C2: 10 µF.electrolítico 25 volts
Q1: 2N2222 (NTE123A)
Q2: c1060 (NTE152)
D1, D2, D3, D4: 1N4002
LED1: Led red.
Z1: Zener for 6 volts 5 watts.
M1: Ammeter 0 - 5 amps.
S1, S2: Switches simple.
Relay with coil and contacts for 6-volt, 5 or 10 amps.
Small 6-volt battery.
T1: Transformer 110 primary, secondary 9-volt and 3 amps
COMMENT: The Q1 should be mounted on a heat sink.
pcb expensive components print