How to mimic running lights, turn signals and hazards with LEDs for diecast model

Question

20 years ago I took electronics in school. Did very well, but never used it much since so I have forgotten just about all of it.

I have been testing in LTspice and just cannot get anywhere with this. Spent about 12 hours total before searching google. Found this wonderful site and searched and browsed for hours and tried a few ideas I found but nothing worked.

Here is the needed setup

• 3 LED's per side of the vehicle
• Using a simple on/off micro switch will turn on/off the running lights which consist of 2 of the 3 LED's per side
• A 555 timer circuit (I have this part figured out) for the flashing (turn signals and hazards)

^{simulate this circuit – Schematic created using CircuitLab}

• A 4 position switch to now control the states of the LED's.
  • 1st position: nothing.
  • 2nd position: flash all 3 LED's on left side.
  • 3rd position: flash all 3 LED's on right side.
  • 4th position: flash all 6 LED's.

I have tried using NPN's in all sorts of configurations. DT switches to control where power goes... I am now at a loss, brain has run out of ideas. If we had SMD LED's with dual SAME color, this would be easy.

If there is any part someone doesnt understand, I can try to explain further.

Answer 1

^{simulate this circuit – Schematic created using CircuitLab}

Diodes can be 1N4148 Resistors X control brightness of flash Resistors Y control brightness of running lights

Get rid of that 1uF cap on the output of the timer IC in your schematic (or connect it to the control pin), or it will do evil things.

The running lights will make D1, D2, D4, D5 a bit brighter during the flash, if that's objectionable, you can fix it by splitting the Y resistors into X and (Y-X)) and connecting the flash steering diodes to those junctions.

^{simulate this circuit}