LED Taillights, Custom Made for the 914 Options

[Spoke]

I've wanted to convert my 914 taillights to LED for a while but never got around to it.

Finally I started working on the design of the taillights. This will be a single custom PCB for each side and will have all the LEDs and control circuits on it. One PCB will be used for both sides.

The plan is to remove the existing plastic reflector and bulb assembly and mount a custom board in its place. With proper standoffs, I should be able to mount the board using the same 2 screw holes that secure the reflector.

I'm trying to decide now how many LEDs to use for each purpose. Right now, I have 8 LEDs for the backup lights, 20 LEDs for the running/Brake lights, 24 LEDs for the turnsignals, and 4 LEDs for the side marker.

I've been observing modern cars with LED taillights and some use a few LEDs (like 8) and some a lot (+20).

I would like your opinions on how many LEDs you think would be good to use. On the board below, the LEDs are spaced about 0.7 inches apart. These will be medium brightness white LEDs. (I'll let the lenses provide the color).

The first cut at the board is shown below for the driver's side. The side marker LEDs will be right angle LEDs pointing out the side of the board. They can be seen on the extreme left side of the board.

If these work out, I could manufacture them for World members. One thing though, they won't be cheap. The LEDs are about $0.50 through Digikey and there are more than 55 LEDs on each right now. Plus there's 2 dc-dc converters for providing constant current for the tail/brake and turnsignal LEDs.

Cheers
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[banger]

After looking at your board, you might want to move the DC/DC converters to the top of the board. This will make it much easier to manufacture if you decide to have the board stuffing done by machine. Also if you buy LED's by the reel, the price is much cheaper. I have a PCB manufacturing line at my office, if you need to have boards stuffed some time.

[Spoke]

After looking at your board, you might want to move the DC/DC converters to the top of the board. This will make it much easier to manufacture if you decide to have the board stuffing done by machine. Also if you buy LED's by the reel, the price is much cheaper. I have a PCB manufacturing line at my office, if you need to have boards stuffed some time.

Thanks for the offer. We'll see where this goes.

The dc/dc converters won't fit on the top of the board because of the way the LEDs are lined up. I thought about that at first and came to the conclusion that they must be on the back of the board.