An application field of electronics that requires high reliability and fail-safe systems. Application can vary widely in temperature ranges and a wide voltage range, typically 12v (or 24v) while off and higher when on.

learn more… | top users | synonyms (1)

0
votes
1answer
66 views

Stabilizing the 12 volts from a car battery

I'd like to put a small gadget that I made into my car and power it from the car battery. The gadget works on 12 volts and the car provides 12 volts also. And the consumption would be somewhere around ...
0
votes
3answers
77 views

Car battery capacity in colder countries

The capacity of the battery is affected when the temperature drops, particularly Lead-acid batteries. So how in cold countries this situation is solved. In this PDF about automotive batteries at low ...
2
votes
1answer
67 views

Relay for Intermittent Wiper Function

I want to add an intermittent function to the wipers on my 40-year-old car without any additional switches. The details of the wipers can be found here ...
0
votes
3answers
46 views

Automotive: how to safely connect the car's power grid to the input of an intelligent switch?

I have an intelligent switch. Let's take this one as an example - it's the one I'm plan on using, unless I find a better one. What I need to do is drive it by the voltage from the car's power grid. ...
0
votes
2answers
54 views

Bulb replacement in a car 12V 60mA vs 14V 65mA

The climate control in my car needs to have some backing lighting bulbs replaced. Can I use a 14V 65mA bulb instead of the 12V 60mA bulb that is suggested by other people who have replaced these ...
1
vote
1answer
41 views

Invert ground vs. open “signal” - relay?

first post here. I'm trying to design a circuit to invert a ground/open input signal. I.e., output is grounded when the input is open, and vice versa. I have a feeling this can be accomplished with ...
0
votes
0answers
47 views

Disabling OBD2-Interface in a car [migrated]

If a car-thief wants to steal a modern car, he often uses the OBD2 (On Board diagnosis) to "hack" the car. Simplified: He achieves this by plugging his "hacking device" in the port, which aquieres ...
1
vote
0answers
47 views

Can anyone identify this connector? [migrated]

All I have been able to find is the image on google. This connector is used on my Mitsubishi and I would like to source replacements for some custom wiring. Wondering if anyone else has seen it or ...
0
votes
0answers
67 views

Through Hole Repair (Missing Pad, Car ECU)

I've got a older Toyota ECU here I'm trying to save, as even though I have a replacement, since it's 97 model year, keeping the original ecu will save me from having to figure out how to sync the ...
0
votes
2answers
55 views

Use of a capacitor to accomodate temporary voltage drop

I recently added a small circuit board to delay my car stereo powering up. The idea was to prevent the stereo coming on in the brief period between turning the key from ACC to START and back again. ...
0
votes
2answers
56 views

can someone help identify and how to test this component

I'm new to this forum and I am looking to properly identify and how to test this component. It is from a vintage Suntester power timing light Model 45XA, 6-12vDC. If anyone can help in describing ...
0
votes
2answers
80 views

Why Exactly Car Charger Stop When Car Is Off?

Just out of curiosity, I'm wondering why car chargers can provide no power when the car is off in most cars. Is it because the electrical system that connects to the car chargers is running off the ...
0
votes
1answer
47 views

Bare bones dual 12V battery isolation circuit?

I'm putting together a bare bones dual battery system for the car so I can run an inverter from the second battery while the car is off. Was thinking I could leave the starter battery as is, connect ...
4
votes
2answers
112 views

Supercapacitor with a rated voltage value greater than 2.7V feasible?

I've been researching into the development of electrical power units for Automotives (motorsports in particular, as I participate in my Uni's Formula Student team) and have started by looking into the ...
1
vote
0answers
43 views

Flashing of ECUs using UDS

Can someone please tell me if flashing ECUs is a standard procedure? Is it done the same way for all vehicles and for different ECUs? Or do manufacturers have their own methods? What exactly is ...
5
votes
1answer
113 views

In Field Car Battery testing

I need to determine the "health" of car batteries in the field. My objective is to predict when a car battery is likely to fail from data collected while the vehicle is in use. I am targeting 3 ...
4
votes
2answers
89 views

How to stop Car Alternator audio noise / buzz?

I connected a Raspberry Pi 2 in the car to add OSMC media player capabilities. However, there seems to be a buzz / hum of background noise in the audio. The noise is correlated to the engine speed so ...
0
votes
2answers
81 views

How to reverse engineer a motorcycle speedometer? [closed]

I hope this is the correct forum for this type of question. I'm trying to start a project to figure out and create a replacement for my motor cycle speedometer. my goal is to take the current unit, ...
0
votes
1answer
42 views

12v LED Turn on and Dimming based on either MAP signal, or RPM of Car

I've got a simple 12v Red Led strip installed in my car, and i currently have it hooked upto a relay which turns it on when you unlock it from the key fob (the same as the interior / courtesy ...
1
vote
1answer
76 views

Actuating a horn

I recently tried to sound a horn (the type normally used in cars) using a 12V battery. The problem is that that, if I directly connect the horn's terminals to the battery, it works perfectly fine. But ...
1
vote
1answer
50 views

Designing amplified speaker for legacy car navigation system

We have a 2003 Honda Odyssey with built-in nav and stereo. The two were integrated -- the nav audio went through the stereo, there was also a mute signal to signal the stereo to play the nav audio on ...
0
votes
1answer
67 views

12V active-low on/off switch

I have a microcontroller that I want to install in my car. One wire coming from the car supplies +12V from the battery independent of whether the car is on or off. This works fine to power the ...
2
votes
1answer
71 views

220µF 35V capacitor replacement

I'm using this circuit to run a small device within my car (12V): Now I need to consider the height of the PCB and C1 is currently 10mm height. Is there a way to replace this component either with ...
0
votes
1answer
24 views

~12VDC+ Automatic Dimmer Switches

Most automotive vehicles typically have their interior lights fade out 30 seconds or so after the doors are closed. The way I understand it, closing the door will usually depress a momentary on/off ...
1
vote
1answer
68 views

Automotive or solid state relay as main switch for 3D printer?

I have 47A 12V server power supply for my 3D printer project. The idea is to add a relay before printer hardware (RAMPS, Arduino Mega clone, steppers, bed heater etc). The normally open relay is then ...
2
votes
1answer
43 views

Custom LED control module for vehicle

I'd like to make a custom module to control the LED in my windshield but I don't know which parts I need. Here's an example I've made in Javascript to show you exactly what I want ...
2
votes
1answer
34 views

Dirtbike ignition system: power consumption

I am trying to calculate the amount of power that a Honda CRF450 dirtbike's ignition system (ignition coil + spark plug) will consume. I'm not very familiar with ignition systems and the currents they ...
0
votes
1answer
44 views

Algoritham to caluculate State of Charge(SOC) & State of Health (SOH) of the LI-Ion Battery?

I am trying to understand the battery management system, but I didn't find any algorithm for columb counting (or) voltage method or any thing else. can you please share this algorithm's if they are ...
3
votes
2answers
398 views

Current Determination - 12V to 5V (USB Output)

I am attempting to determine the current in an automotive installation of a 12V to 5V converter that will supply a USB output. Max output on the 5V side will be 3 Amps. ...
1
vote
1answer
81 views

Op-amp - dual to Single supply conversion to avoid floating of input signal?

I'm designing a voltage measurement adaptor. And my signals are PWM type which ranges from 0-36V. I thought of using Op-amp to step down to 0-5V range and use an ADC to convert analog signals into ...
0
votes
5answers
124 views

What is the problem with charging a (lead-acid) car battery with AC power?

The closest thread I've found (which didn't show up in the automated suggestions) was What happens if an AC voltage is applied to a battery?. Unfortunately, I felt like the answers were more aimed at ...
1
vote
1answer
52 views

What specifications must I consider for a DC motor?

I'm working on a project where I need a DC motor that is capable of tightening a bolt with a motor. The applications will typically be automotive, therefore, the bolts will need to be tightened to ...
0
votes
3answers
86 views

Buck Boost Circuit for Automobile starter circuit

One of the major problem with two wheeler like Royal Enfield is that the starter motor wont work efficiently as the battery ages with performance. Morning cold cranking the engine ignition will not ...
0
votes
1answer
42 views

USB car charger input 10vdc instead of 12 VDC

I am running a project where I will have a small steam engine turning a dynamo. the dynamo produces 12VDC no load and 10VDC 10 watts under load. My plan was to buy a car usb charger and connect it up ...
0
votes
0answers
59 views

Trailer Brake Converter / Turn Signal Priority

I am trying to build a Trailer Brake Converter or a Turn Signal Priority circuit. Basically, the wires I have coming from the car are a Tail Light, Brake Light and then a Turn Signal Wire for each ...
0
votes
1answer
46 views

12V 400mA solenoid

I am trying to hook up a train horn on my truck and I want to open a valve with a switch. I have a solenoid actuated valve that is 12V 400mA. Can I connect it directly to a switch from the battery, ...
-1
votes
2answers
104 views

How to design car buzzer alarm with minimal current consumption of 12V battery?

Could you please help me to design Car alarm buzzer circuit using relay, and Input of the relay and buzzer should be +12 volts from car battery. when i have searched about some circuits and buzzer its ...
1
vote
2answers
77 views

What kind of micro bulb is this? [closed]

I am doing a clone of my Honda's dashboard circuit. Everything is fine except I cannot find the tiny backlight bulbs (see photo) that are used for the dashboard button illumination. Are they standard ...
0
votes
3answers
88 views

Short circuit in Vehicles

I wanted to know what are the techniques employed in heavy vehicles to avoid short circuit or protect if short circuit happens? Since the batteries in heavy vehicles are highly powerful and short ...
1
vote
1answer
494 views

Reading car speed sensor (SDV)

I've been trying to interface with my car's info screen, called a TID (Triple Information Display), from Opel. From the factory, there are multiple things attached to this screen, one of those a line ...
0
votes
1answer
63 views

Appropriate BJT for car circuitry

I am designing a LED Headlight for my car. But I am confused about my BJT, I dont know if it is suitable or not. The overall design is given below. The problem is, when I run the ckt under engine ...
0
votes
0answers
74 views

What tool can monitor voltage on a bundle of wires?

I'm working on a vehicle and trying to determine which wires control which circuits - power windows, power locks, starter, trunk release, etc. I've searched but have not been able to find the wiring ...
1
vote
1answer
91 views

How to calculate solar panel setup?

I have an equipment which draws 550W at a constant level, no peaks. I want to power this unit with solar cells only during the day when there is light using a simple car battery. Because I don't want ...
1
vote
0answers
124 views

Can AC/DC conversion losses from solar panels be avoided with a Tesla Powerwall?

(background: I'm just playing with numbers, trying to estimate how many solar panels would be needed to fully supply the energy for a home and 2 Tesla cars) I've been reading up on solar panels and ...
0
votes
1answer
45 views

Converting 12VDC to 7..9VDC (20A)

I used to have a 3-coil cooling fan that would rotate slow or fast depending on what is powering it - the air conditioner "signal" would make it rotate slower than that of the engine heat sensor. Now ...
0
votes
5answers
251 views

Low power reliable motion state sensor for car

I am looking for a sensor to reliably determine the state of motion of a car (passenger, van, forklift, tractor). I will not disclose the nature of the project at this time but a similar sensor ...
1
vote
3answers
132 views

Insufficient current to drive automotive relay?

I'm adding a leisure battery to my van so I can run some stuff with out fear of draining the starter battery. My leisure battery is wired to my starter battery so it can charge from the alternator ...
1
vote
1answer
90 views

How would you jerry-rig an android phone for continuous autonomous operation?

I want to use an android phone as dash-cam with GPS tracking capabilities. It is supposed to run 24 hours a day, 365 days a year. If the phone / app hangs, the user cannot be expected to ...
0
votes
1answer
37 views

Autoelectrics: Testing components off 12v battery

I'm quite good with mechanics and am just starting to learn more about electrics specifically applicable to automotive. One thing I am still yet to get the grasp of is the way electricity behaves. It ...
4
votes
4answers
1k views

Checking when a car horn is pressed?

I want to detect when a car horn is pressed. The only way I can detect it currently is using the voltage on its line. When the car is turned on, there is always 12V being supplied to the horn through ...