Production of
Head lamp illumination
confirmation device
The circuit esteemed miniaturization and made in a transistor circuit.
It can make to a small size by using IC in the large circuit. It can make small by using the transistor in the circuit like this time. The resistors etc. do mount vertically.
In the case that the circuit is attached to the car, it insulats with the vinyl tape or installs to a small case, and it attaches in the reverse side of the dashboard of the car.
For the attachment of a Cds element, you make the hole at the side of the head lamp case that Cds enters and attach with glue.
In the case of the attachment of LED of the driver's seat, you also make a small hole to the dashboard of the car and attach it.
Please devise the attachment method case by case.
About the circuit action
< Normal condition >
When light hits to the Cds element the resistance value drops.
The as case, the current flows through R8 and TR3 becomes ON condition. Therefore, LED becomes illumination condition.
< In the case of lamp gets broken >
In the case that the head lamp circuit is operating, the a-stable multivibrator circuit where is composed of TR1 and TR2 is carrying out an oscillation action constantly.
When the right or either left head lamp cut, the resistance value of a Cds element becomes big. Case, like that the output of the multivibrator is conveyed to TR3 through D1 and flash LED.
Circuit drawing
The resistance value to light differs by the difference of the kind of a Cds element.
The action is adjusted by R8.
Pattern drawing
The pitch of the hole is 0.1 inches.
For the blue line the twisted wire covering soft insulation material is used.
As for the method of printed board wiring, see the assembly process.
About the circuit action
