Questions tagged [automotive]

Questions about the design of electronics for use in an automotive environment. (Questions about the installation and use of automotive electronics are unlikely to be appropriate for this site.)

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2answers
2k views

Do fuse blow on ampere or effect?

I have a faulty car (bad central locking engines) and a fuse is blowing every time I open/lock the it. I'm looking to do a quick fix, and just replace it with an automatic fuse. The car runs on ~12V, ...
6
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3answers
55k views

Is it okay to keep a USB charger plugged into the cigar lighter?

I have a USB micro charging adapter for my smartphone for my car. It is basically a cigar lighter plug that turns into a USB micro plug. When I don’t have my phone connected, and as such don’t want ...
4
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3answers
2k views

Design of Wiring Harness Tester for Automobiles

I've been given a task to design a wiring harness tester for automobiles. The tester's job is to test wiring harnesses which can contain upto 300 wires. My initial design was quite simple. Feed the ...
6
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3answers
2k views

Is the 42V car dead?

I was rather curious about why many buck converters and linear regulators were rated up to 42V, or close to it. It's a rather strange voltage to stop at, after all - why not 40V or 45V? I read that ...
15
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4answers
5k views

Protection against automotive power supply hazards

I'm looking for a way to protect a small circuit which is to be used inside of a car or truck (12V or 24V power system). The circuit consumes about 12-15W. I use an isolated DC/DC converter module ...
-2
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1answer
388 views

I am thinking of designing an electric car and am wondering about the best way to drive the wheels

I'm thinking of a light cart - barely enough room for one person and the batteries. What do you think would give me the best battery life? I am thinking a (brushless?) motor with the input voltage ...
4
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3answers
1k views

What device is a car radio dial?

I'm trying to find out what the device is called that is found on a car radio. The dial that you turn to change stations. I want to track one down to see how it works, but I have no idea what it's ...
2
votes
1answer
213 views

How does a dual-wattage (automotive) bulb work?

I have a motorcycle headlamp bulb on my desk here. I notice the bulb has a rating of "60/55W" and has three connectors instead of the usual two. Evidently these correspond to the high/low beam ...
1
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3answers
441 views

iPod connector car control

I recently bought a car with an iPod dock. When I plug in the iPod disables and I am forced to control it with the car's audio controls. I want to get around this. Can I simply yank pin 21 from an ...
3
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4answers
7k views

Combining RFID badges

I have multiple RFID cards that I use to get into parking garages at the office, client site, home, parents place, etc, etc, etc..... I'd like to either A) combine all of these into 1 card or ...
0
votes
1answer
893 views

Car Inductive Charger Module? [closed]

I will try to design an inductive charger which will run by using cigar lighter of the car. Does anybody have any suggestions on my project? Taking the power from cigar lighter is easy but how should ...
5
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4answers
2k views

is it possible to install some device which will measure in real time the torque my diesel engine is providing at the moment?

It is easy to make a meter which will show the engine RPM, many cars have one installed. But to know the power in kW that the engine is providing right now, I also need to know the torque, because: \$...
1
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2answers
330 views

Is it a good idea to make a second DC installation in a car with its negative separate from the car body?

Normally in a car's DC installation the negative is on the car's body. Is it just to make it cheaper by not having to provide two wires everywhere, but just one and use the car body as negative, or is ...
5
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2answers
2k views

what does “70A moy/arit 90A eff” on a high-current automotive lead-acid battery charger mean?

I have a huge (28 kg mass) automotive high-current battery charger, and its current delivering capabilities are described like that: 70A moy/arit 90A eff What do ...
5
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3answers
1k views

Powering Thin Client PC from car's battery

I have a thin client PC manufactured by HP (t5720). The following specs are written on the power supply: Input: 100-240V AC 50-60Hz 2.4A(2,4A) Output: 12V DC 4.16A(4,16A) Max Output: 50W I ...
12
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3answers
7k views

Extra negative battery cable when charging outside car?

If you go to: http://www.battery-chargers.com/charging_instructions.htm ...Under "Operating Instructions" part "B: Charging battery outside of vehicle", it says you have to attach an extra jumper ...
9
votes
2answers
15k views

How do I protect against an automotive load dump?

A load dump occurs when the load to which a generator is delivering current is abruptly disconnected. In automotive electronics, this applies to disconnecting a battery while it is being charged by ...
7
votes
11answers
59k views

What are the ways to allow/prevent a car engine from starting up?

Assume that I do not want to replace a factory Engine Control Unit (ECU) with a custom ECU. What are the other possible intercept points that I can use to allow/prevent a car from starting up? I only ...
2
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1answer
8k views

Question About the Ground Wire on Aux Attachment Circuit for my Car

This is a specific question about a specific circuit, but I'm trying to use it as a learning experience as I'm still new to electronics and need to take practical knowledge where I can get it. I ...
0
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5answers
1k views

How can I build a switching circuit that scales several 12v signals down to <5v?

Let me start off by saying that I know just enough about electronics to be dangerous (how to solder, follow a simple schematic, and check for connectivity problems and usually figure out what each ...
2
votes
1answer
428 views

Controlling a NE2 lamp with a 12 V signal

I have some NE2 lamps i want to control with a signal from my car. Signal voltage is about 11 to 14 volts and isn't very clean. I also have 170vdc available to power the NE2s. I plan on using these ...
8
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4answers
2k views

Car Tail light - why the extra components?

I'm replacing the LED in a car tail-light. Naturally, it will run off 12V (battery) but the circuit I have uses just an LED and a 0.6w (440ohm) resistor. But the existing circuit includes two, larger ...
6
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2answers
2k views

iPod Car Charger w/ Audio Out

I have been working on a circuit design that would allow me to charge my iPhone/iPod classic 120 GB from my car. I am going to use power from the back of the cigar lighter sockets and put it into this ...
10
votes
5answers
3k views

12v LEDs and use on a motorbike

I would like to replace the bulb based tail/brake light and rear indicators/flashers on my bike with one integrated LED unit (flashers in brake light). These are pretty expensive, and since I'm on a ...

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