Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
I don't really know what to use. I'm starting to think it will be an impossible feat to have a simple time delay circuit. Having constant power is not an issue, there is always 13 volts available from the battery. I just want when the ignition is turned off the led's will stay lit for another 5...
For furthur clarification this will be running on a 12.6 to 14.5VDC car power system. That's why I use the 13 volt average number in my previous posts.
After further review I believe the capictor is difenetly the way to go. I already know the resitance of R2, Since the foward voltage of my LED's are 2.2 and I'm running on a 13 volt circuit with a max current flow of 30 mA I will be going with a 330 ohm resistor.
Now here is my latest battle...
Sorry, but I'm not the best with chips. Would you be able to give me a example of a way to wire a 555 timer? One other question, are there different 555 timers or do i just go in to an electronics store and buy a 555 timer?
A capacitor would work for sure. The only down fall to a capacitor for me is my space is a little limited. I'm not sure what size of a capacitor I would need but it would most likely be to big. I'm looking into timer modules but my electronics knowledge fails when it comes to chips. My led's are...
I have a question about designing a timer circuit. I have two LED's wired in series running at 18 mA on a 12VDC circuit. All I want is a way to have them stay lit for about 5 minutes after they loose their switched power. I know I have to supply them with a steady power and ground. I want to be...
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