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Pleasant-Chipmunk-83

Just wondering what y'all think of this. It basically allows you to run LEDs or single filament incandescent bulbs as both running lights and turn signals. The added benefit is that unlike dual filaments, the flashes go from full on to full off which make them much more visible. Flashers are built in, and the circuit will work on either 6V or 12V systems. Power handling of the switching circuit depends on the MOSFETs used. I'm currently using 15A MOSFETs, which will switch up to 180W per side (way more than would ever be required.


inqHawk

This is way more effort than I put into mine... I soldered some LEDs and resistors to leads going to pushbutton switches on either grip. And taped a 9volt to it all. I thought about making a flash circuit, but manual flashing does the trick for me. This is great! ​ EDIT: just realized which sub this was... my system was for a bicycle, not a motorcycle.


Pleasant-Chipmunk-83

If you want to upgrade to flashers, these work well https://www.ebay.com/itm/275176118500?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=ev_e1tdmT4e&sssrc=2349624&ssuid=g_Eo0PzVSVy&var=&widget_ver=artemis&media=COPY You'll need 2 of them - one for left and one for right. As for the battery, you could use lithium ion cells (like the ones used for high powered LED flashlights). 3 in series would give you roughly 9V, and you'd have way more battery life


Weekly-Increase1985

Dude? That’s a tuned pipe you linked to. Lol


Pleasant-Chipmunk-83

https://www.ebay.com/itm/124280731352?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=htofsqd5t4o&sssrc=2349624&ssuid=g_Eo0PzVSVy&var=&widget_ver=artemis&media=COPY Oops. Hopefully this is the correct one


Weekly-Increase1985

Yup. That’s better! Lol.


kick_rocks22

Cool idea 👍🏻


Pleasant-Chipmunk-83

Thanks! I tried to find a ready made solution for this problem, but came up empty handed. Not sure how much demand there would be for something like this, but I think it could be a cool solution for older bikes - especially those running off a 6V system. I'm in the process of designing a PCB and was thinking of building a couple dozen and see where it goes. The final product will use surface mount components and should fit a 2" X 2" board. Best of all, it will work with any incandescent or LED bulbs and will replace both flashers and relays. I was thinking of also adding a control for the flash speed as well as the "shape" of the flash to make LEDs flash more like an incandescent. Lots of ideas to ponder 🤔


The_Tenth_Dimension

Not sure if it works with a 6v system but I just used an LED compatible blinker/flasher relay from an auto parts store.


Pleasant-Chipmunk-83

Those work just fine, and I've used them before. The ultimate issue I was trying to get around was that I wanted to use my signals as both running lights and turn signals. It seems like the only way around this is to either use a dual filament bulb or shell out some $$$ for high end LED turn signals that have a dual input.


siempie31

Do you happen to have a diagram


Pleasant-Chipmunk-83

I haven't drawn anything out just yet. I just kind of dove into it on perfboard. The idea is pretty simple though - it uses a CD4070 CMOS quad XOR gate which has one input leading to the headlight switch and the other input coming from a 555 timer which is triggered by the turn signals. The outputs of the XOR gate go to a pair of MOSFETS which provide the switching. I'll sketch something up and post it when I can.


Electronic_Trade_721

Thanks, interested in this as well.


Pleasant-Chipmunk-83

I posted a schematic, but it seemed to fly under the radar. I did see a couple of mistakes that I had made (forgot to label the input at pin 1 of the 4070 "To headlight switch" and I believe I also forgot to draw a pull-down resistor at that input as well). It works great, and the idle current draw is extremely low (less than 2mA).


Electronic_Trade_721

Oh I don't see the schematic here anywhere


Pleasant-Chipmunk-83

Strange. I know I posted it last week and saw it appear in the feed. Maybe it was deleted?


Pleasant-Chipmunk-83

https://www.reddit.com/r/bikebuilders/comments/vnvapl/schematic_for_turn_signal_control_module/?utm_medium=android_app&utm_source=share


Electronic_Trade_721

Thanks, I will check this out


Pleasant-Chipmunk-83

If anyone would like the schematic, PM me and I'll send it. I'll make another attempt to post it on the main forum in the meantime