The proposed device automatically turn on the headlights of a car. It is comparator and a powerful MOSFET switch (120W/10A), allowing direct switching of lamps without additional relays. The typical way of connecting is the +12 V is operational after ignition key. To avoid simultaneous operation of "long" and "short" ligths (for lamp H4) is designed to block entrance to the DIS +12 V . After switching off the ignition key lights remain on a few seconds. To turn on the lights must to be initially met two requirements : time runs out t = 10s and Ubat. is> = 13.2V (after starting ingnition). Then switch MOSFET is not dependent more from the battery voltage. Operating wires max. 0.75mm2 Power cables> = 1.5mm2
- length - 40 mm
- width 27 mm
- height 21 mm
Wired with 10 cm wires:
Power: + RED, - Black . Have protection against reverse supply voltage.
Normally open contact - TWO Monochrome white wires
DIS input – orange wire
Cut on Ubat. > = 13.2V after delay of 8 sec.
Standby current: 1.5mA
Delay on: ~ 8s
Delay off after cut off the contact key: ~ 4sec
Time Delayed recovery circuit: 0s
Activate DIS terminal and switch off the relay: switch to +12 V (without power ,or "-" does not work)
Max output power: 110W (2x55W).
Principe of work:
When power is on, if Ubat>= 13.2V the delay time start, led diode lights. When set time end, the relay is activated and output contact is closed, until cut off the power.
By restart power supply - cycle repeat.
Device have plastic box, as see on the picture.
It can be used for example for delay on of car lights. When ignition is start - the timer will wait (8s) and then will on the front lights, to save the car battery. When ignition is off - the lights will cut off after 4s The timer need to receive 12 from contact key and output to be wired to front lights switch.
1. Mini Time Relay
2. Instruction for use and wiring diagram.