Questions tagged [12v]

Questions relating systems powered by a 12 volt supply. This may include automotive systems and lead-acid batteries that are nominally 12 volts although be aware that under many conditions the actual voltage may be several volts higher.

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1answer
28 views

What is the correct wire size to run to a 12V 1.5 amp window blinds motor that is 47 feet from the DC transformer?

I read somewhere that an 18/2 wire could be used to connect a transformer to my window blinds motor (12V 1.5 amps). However, it didn't say anything about the distance. Since I am running it inside ...
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7answers
1k views

Soft start for fridge compresser

I live in an off grid property running on 6 12v batteries. We have a 2000w inverter and are trying to get a fridge to run on our system. We have enough power to run it however the issue I am having is ...
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1answer
59 views

Use one 12V 30A timer for two separate 12V inputs?

I'd like to use the following timer, rated 12V 30A, but for switching two different 12V inputs at the same time and not having to buy and program two timers. But the timer only have one channel. One ...
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1answer
67 views

2n2222 with 12v 8mA

I have a circuit running on 12v 8mA and I want to get a signal to a GPIO of an esp8266 when current is running. So for that I tried to use a 2N2222 transistor with vcc of the circuit going to the base ...
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1answer
91 views

How to deal with an inconsistent / noisy power signal?

I'm using a 12v power supply to operate a system of sensors that is very sensitive to fluctuations in the voltage input. Unfortunately, I can't control what goes on upstream of my components and this ...
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1answer
146 views

PMOS reverse polarized - 12v light

I've this circuit: simulate this circuit – Schematic created using CircuitLab I have a doubt, when I press the SW1 the LAMP1 turns on, when I press the SW2 the light turns on but the P channel ...
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1answer
218 views

Connect 240v PIR motion detector to Raspberry Pi

I want to connect a 240V PIR motion detector directly to my Raspberry Pi 3. Inside its plastic case I found 2 PCBs. One is the power supply board which has a 24VDC relay, a S9013 NPN transistor, ...
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1answer
31 views

Wiring 4+ 12v led ring switches from one 12v supply

I am new to electronics and general electronic circuits. I have 4+ led ring switches (from here: follow link) The website says that the rating of the switch contacts is 5A 250VAC with an ...
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1answer
41 views

Powering high-power laptop from DC without inverter

Context: We live full-time in an RV (a travel trailer) while traveling around the US. We have 300Ah of 12V Lithium batteries, a 3,000W inverter and 600W of solar. Although we have an inverter, it has ...
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1answer
42 views

Dupont jump wire in order to replace 20 pin cable

Hello, I bought a mp5 player for my car and I didn't find the 20 pin cable for this player. My question is if I could replace it by Dupont jumper wires as the picture shows
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1answer
110 views

Charging rate for deep cycle 12v battery

I have a 75 AH deep cycle battery(AGM) and I have a battery charger with 2 modes, 5.5A for car, 2A for motorcycle, as far as I remember, lower charging rate is usually better for longer battery life ...
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0answers
95 views

12V voltage regulator

simulate this circuit – Schematic created using CircuitLab I have bought the LM78H12K 12V voltage regulator, for the 12V output. My input voltage is 17 V DC, but unfortunately this component is ...
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2answers
52 views

Case Fans in DC

I need to run about 15 12V case fans(80mm) from wall power. How do I do that? How much amperage do I need? Which voltage adaptor do I buy? I have searched this site and many other sites such as this ...
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0answers
64 views

Boost 12v battery cranking amps with supercaps

I have a setup where a 12V AGM battery is powering an inverter. This inverter, for brief periods (1 or 2 seconds - compressor starting) needs more amps than the battery can provide. Is there a ...
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2answers
6k views

Replacing alternator warning lamp with LED

I have an alternator on an in-board motor in a boat, I have almost completed re-wiring the electrical system and am wondering if it is possible to replace the existing filament lamp. I have ...
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1answer
2k views

12v 400 amp cable size for winch or two cables instead of one

I need to run cable to my 12v recovery winch. Run is 15 ft from battery. Winch info says at full load it pulls 400 amps. Instead of running one positive lead due to the size it would need to be i ...
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4answers
4k views

12V DC to 12V AC (50 Hz) Converter / Inverter for low loads (< 1A)

I am building a mobile Sound System powered by a car battery. I have a small mixing table that runs on 12V but it needs AC Power (50Hz) and won't work with DC (I tried that, with very weird results). ...
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2answers
52 views

Powering WS2812b 12V

I have an idea to use WS2812B as animating light on some old equipment. And I have some doubt. The equipment is 12v so I want to use WS2812B directly on 12V, namely I want to use 5 WS2812b in ...
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1answer
122 views

Which connector type is this?

I'm looking for the bullet type connector that is used with Tracer Power batteries. Here's the link for their version of it: https://www.tracerpower.com/bullet-bare-ends.html I found a connector ...
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1answer
83 views

Confusion regarding a 12V DC motor's RPM

I have a 550 DC motor of 12V, 45W and 10K RPM installed on a wheel, which is not causing the wheel to turn fast enough when the motor is connected to a 12V battery. I replaced the motor with an older ...
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2answers
402 views

Interpolate variable 0-24v to power a 12v fan and control it's speed

I want to replace the two noisy 24v brushless fans on my printer with high performance silent 12v fans, more specifically Noctua A4x10 FLX The 3D printer hot-end fan is on continuously with 24 volts, ...
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1answer
78 views

Help me understand my campervan split charge relay

I am new to the world of electronics, but keen to learn. The below all relates to the 12 V circuit of my van. I have picked up a campervan which has a second "leisure" battery which powers items in ...
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1answer
45 views

Create circuit for 12v auto washer pump to 230v mains with push button for art installation

I am creating an interactive art installation in a gallery context using a 12 volts car headlight/windshield washer pump. It basically is a fluid washer pump taken outside of a car into a gallery, ...
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1answer
609 views

Voltage drop (stop-start) impacting car DVR/dashcam

My scenario is simple. I have a 12V to 5V inline USB convertor powering a dashcam/dvr. However, the circuit of the car I'm using to power it isn't clean enough, especially with the car's stop-start ...
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4answers
1k views

Is there a way to tell what frequency I need a PWM to be?

I have a 12V DC motor that turns at 60 RPMs or 1 Hz. Do I need a PWM that matches the frequency in order for it to work? Most of the ones I've seen are around 25 kHz for a 12V 20A motor.
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3answers
341 views

Light Sensitive One Pulse Activated Switch

Hello I planned a light sensitive one pulse activated switch to know when water tank is completely filled and to turn the water pump off using a relay until I reset the circuit using its N/C Switch. ...
2
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1answer
375 views

UPS battery as auxiliary power supply for car - charging and detecting car on

I'm designing a arduino-based car system that I would like to have running even when the car is off and parked. Though the system is designed to be very energy efficient, I don't want it to run down ...
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0answers
41 views

why wouldn't a 9-60DCV 20A PWM motor control work to control a 12v 20A wiper motor [duplicate]

I have a question regarding controlling the speed of a wiper motor with a PWM vs wiring in a rheostat in the positive side. I have a 110ACV-12DCV 20A converter going to a 9-60DCV 20A PWM motor ...
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2answers
62 views

Is there a reason why lower voltage batteries are preferred for high AH?

I was looking at these batteries and considering whether to use a 12V battery or multiple 2V batteries for backup power. In any case, I came across this battery by Exide Tech - GNB Flooded Classic H1T ...
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1answer
280 views

Vibration sensor switch for Car

I am building a small GPS tracker for my car using a Raspberry PI Zero plus some additional components. I would like to keep it off unless the car is turned on or it's moved forcefully. To do that I ...
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2answers
2k views

Make 12v stabilizer for car reverse camera

i have to mount a reverse camera on my car. The problem is that the car voltage is not stable, probably the engine makes some interferences. Infact when i turn on the car but not the engine it works. ...
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1answer
81 views

Is it possible to patch together a DC system with these random materials? [closed]

I have a small collection of random batteries and solar panels, plus two charge controllers. I am hoping to build a system which can charge devices like phone, tablet, portable power banks, etc. (...
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1answer
1k views

12V SLA Battery Charge Controller [closed]

i'm building a robot (a sort of rover) which includes a 12V/7Ah SLA battery. The robot circuit needs a regulated 12V supply to work correctly. I would like to charge my rover using a generic 14-19V ...
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1answer
513 views

changing 12v halogen lighting to 12v LED

i have an old project that is causing the client current problems. installed was 12v halogen lighting 10w bulbs,G4 base, multiple lights, buried cabling, multiple transformers from 120v to 12v. client ...
3
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4answers
692 views

12V lead acid charger with LM317 not charging

I have this circuit built and tested. I think this should work and charge the battery with 0.4A to about 13.5V. The Problem: it doesn't charge and between U1 and U3 (Battery) is a current of about 0....
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1answer
220 views

12 V 3.8 A water pump to 12 V 625CCA battery

Wanting to use car battery to power pump. Pump says it's 12 V 3.8 A, uses a 8 A fuse. Trying to sort out possible solar input needed to run pump but the numbers don't make sense. What size solar panel ...
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0answers
41 views

When to monitor battery capacity

While other good answers have stated why discharging a 12V lead acid battery is hurtful to it, I seem to be unable to find how you should monitor it. Assuming I want to stop drawing current from the ...
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1answer
2k views

Regulator to feed Arduino VIN with 12V?

I am quite new to electronic and I'd like to build a setup plugged with a 12V PS (because there is a water pump in my setup). But at the same time, I'd like to feed the Arduino VIN with the same ...
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1answer
44 views

Controlling 12V 70A Motor(s) with Arduino MEGA (or NANO) and a 4-terminal automotive relay

Components I have: Relay (rated at 12V, 70A, cannot find how much current is needed to saturate its coils) Schematic Arduino MEGA and NANO 12V Powerwheels battery + AA battery packs Motor: 00968-...
2
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1answer
187 views

UL 840 clearances

The table 8.1 in UL840 doesn't consider clearances for voltages less than 50V (for example). I have to use a clearance of 0.2 mm on the PCB for the case of overvoltage category 1 and pollution degree ...
0
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1answer
64 views

12V - How to activate an electric item if battery is full

I have a solar system 12V connected to a PWM controller 20A and a lead-acid battery 80Ah deep cycle. What kind of setup should I make to activate a pump (12V) if the battery is full ( >13.8V ) ?
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1answer
83 views

Solar power charging problems

Is it possible to power a 12v power board with a lithium battery, while keeping it charged via a solar panel. Or would I need to have two batteries and somehow automatically change them over when the ...
0
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2answers
482 views

How to run a fridge on off grid system

So I live off grid and have a 12v solar system with an array of batteries and a 12v 45amp MPPT controler. I also have a 1000w inverter for things such as powering my laptop and things. I have ...
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3answers
4k views

Can we switch ground in relay

I am having a 3 pin relay used in bike horns. My need is to turn on and off ground using the positive as trigger. That means the positive terminal of the device is connected to the 12v supply. Usually ...
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1answer
40 views

Normally Closed Negative Output, Positive Input Relay

I'm attempting to wire up my remote start in my manual transmission vehicle to ONLY start when the vehicle is in neutral. The way that the transmission works is like this: When in neutral, resistance ...
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3answers
143 views

12VDC to 3 Phase 400V

In order top prevent my seldom used deep well pump (3 Phase, 400V) I plan to daily spin it up for a few seconds. Where the pump is located, the is no power supply (I operate the pump using a ...
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1answer
116 views

Is this a feasable method for using 12VDC LEDs as power indicators?

I've been looking for the answer, but everything I've found is assuming the LED is of a lesser voltage, or a fixed voltage. More than anything, I'm trying to determine if the concept below is ...
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1answer
108 views

Need to determine a mosfet, and wouldn’t mind a little education in the process

I want to start off by saying that I am a complete electronics newb. I know a little but am always looking to learn more. With that said I am asking for a little help and a little learning. Here’s ...
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3answers
86 views

What is this small circuit board used for in a 12v light?

Repairing a home-made disco light that was used in a nightclub during the 80's/90's and it consisted of 16 12v 50w lamps arranged on 8 legs. I have discovered a small circuit board within each lamp ...
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1answer
151 views

Arduino and car's 12V switch

I'm trying to control my headlights with my Arduino and a LDR. For this I will use the Arduino as a middle man between the lights switch and the actual lights. The switch has three positions OFF / ...