Traffic rules require that in daytime car rode with the included driving lights headlights. Not to forget the middle light is turned on or off, many motorists driving lights is connected at the output of the ignition lock. This solution but not very correct. Because, firstly, the light turns on as soon as the ignition is turned on, and not after the engine has started to work. And, secondly, when such a scheme in the far light, middle light remains on. If the low beam lamp and far different, this is not a problem. But most cars in Farah installed DNA Double-strand lamps, which are not designed to work two strands simultaneously and therefore fail from overheating.
Figure. 1
The problem can be solved, if dooboru recommend these easy car device. By the way, it is fit and to control additional running lights. In the scheme of one chip type to 561 Re5. Power connects to positive battery and "weight". As well as to oil pressure sensor (light bulb) and chain marker light.
After engine start capacitor C1 is charged through R1 to logical unit seconds behind 15-20. Then on the output of Schmitt trigger (D) 1.1-D 1.2 is installed logs Czech unit. The same item and outlet (D) 1.4. Transistor VT1 opens and relay K1 includes headlights. Contacts of the relays must be connected in accordance with the scheme of inclusion of car headlight. Either they consist of DRL.
Fig. 2
If the driver itself includes headlights, tail light is turned on, the logical unit voltage comes through R3 at the output 13 D 1.4, and its output is set to zero. Relay K1 switches off and does not affect the proper working of the headlights of the car.
Author: Kuzanskii L.
