Incandescent. I over complicated that answer.

OK

It will be inserted into the vehicles wiring.

We know that.
But I still don't understand what you really mean?

 

But I still don't understand what you really mean?

The screw connector uses the first two to connect to the car's live and earth (the live feeds the L7805), the other four are outputs to brake lights, indicators right and left and the other could be reverse lights, fog lamps or tail lights.

 

Yes...that metal plate is heat sink.

What about mounting the heat sink above the board? Then four screws that run through the heat sink and board, to the container with raised screw holes to support the board?

 

I suggest using some PCB cleaner spray (preferred) or rubbing alcohol and clean the boards.
Especially the bottom of the main board so we can clearly identify traces, then repost.

 

What about mounting the heat sink above the board? Then four screws that run through the heat sink and board, to the container with raised screw holes to support the board?

View attachment 312466

That's possible, if you want to retain the original BJT power transistors.
But if we use mosfets, they likely won't require a large a heat sink. It will be much smaller.
There is also a possibility of using surface mount device for the remaining parts, making the overall circuit board much smaller than the original.

 

I have seen power-tab transistors mounted in the same places as the power transistors were mounted. A bit complicated but certainly possible. Of course, those were TO-220 package transistors with the collector internally connected to the metal tab. The base and emitter legs were bent to fit the socket connections.
So with a bit of careful thought the same design could be used.

 

But if we use mosfets, they likely won't require a large a heat sink. It will be much smaller.

So, they will be part of the PCB instead of being separate?

There is also a possibility of using surface mount device for the remaining parts, making the overall circuit board much smaller than the original.

I gather they are more difficult to place than through the hole soldering.

 

So, they will be part of the PCB instead of being separate?

My guess at this point is "yes", it will be one PCB with mosfet heatsinks. Unless there is a compelling reason to have separate PCBs.

I gather they are more difficult to place than through the hole soldering.

Yes. if you've never done it before, but does get easier over time. They also require different tools/technique to solder.
We can also stay away from the smaller smd devices and use the larger ones. Even if we stay with thru hole devices the PCB would still be smaller than the original.

Are you planning to mass produce this?

 

Are you planning to mass produce this?

At the moment the plan is to make five, maybe ten.

On the subject of mass producing there is gap in the market for a particular electronics product, but it will need kickstarter funding and people with an expertise in electronics and software - watch this space. The last one sold for $11m cash and about $4.6m in notes and the buyer only used a portion of it.

Even if we stay with thru hole devices the PCB would still be smaller than the original.

Sounds like I will need a magnifying glass! Might have to order double the quantity of everything as, no doubt, mistakes will be made

 

Sounds like I will need a magnifying glass! Might have to order double the quantity of everything as, no doubt, mistakes will be made

The circuits look simple enough we could probably just simulate, debug, maybe breadboard certain functions, then make a thru hole prototype PCB. After debugging that, then decide whether to convert to SMD, part quantities, etc.
But its very important to know what the target lighting patterns will be.

 

But its [sic] very important to know what the target lighting patterns will be.

This weekend we intend to put together a mockup (bulb holder and bulbs) with the existing circuit and video it.

 

Video attached - it does not allow upload of video files (mp4) so it's been zipped.

Thank you for your help.

 

Video attached - it does not allow upload of video files (mp4) so it's been zipped.

Thank you for your help.

Interesting...

Is that the only lighting pattern it produces?

 

Is that the only lighting pattern it produces?

I assume so.