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
34 views

Overcharge a sealed 12V lead-silver-calcium battery with a power supply to prevent sulphatation

I read that lead silver calcium battery need 14.8 V to fully charge. The max with my charger (ctek) is AGM setting which is 14.7 Volt. I fear this lower voltage this will lead to sulphatation of the ...
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2answers
52 views

Can I change the voltage (12V) input into my optocoupler to 24 V?

simulate this circuit – Schematic created using CircuitLab I have an inductive sensor (LJ18A3-8-Z/BX,) normally open 6V to 36V 300mA. It is connected to a 12V 80kHz single channel opto-coupler. ...
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2answers
84 views

Can I safely balance a series/parallel cell circuit to power a 12V soldering iron?

I want to power a 12V soldering iron with 2x 21700 '40T'batteries and 3x 18650 '25R' batteries with a torroidal rheostat between them. The 3x25R batteries will be in parallel. The rheostat will ...
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2answers
79 views

Power 12v DC actuator when 120v @15 amp saw is switched on

Problem: I want to use a 12v DC actuator to close a blast gate on my dust collecting system when I turn on a 120v 15 amp saw. The actuator can only run for a few seconds until the 6" stroke is ...
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0answers
34 views

Is it possible to combine 2 Arduino codes into 1 sketch for 2 different sensors and output components? [closed]

Based on what you see, I have found 2 different source code for 2 different sensors and output: Simple Auto Fan ...
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4answers
102 views

Tap into 12AWG wire with 20AWG wire

I am using 3 of these Mighty Max 12V 12Ah batteries on my Razor MX650 electric bike and they are connected with 12 gauge wire. I would like to tap into the power on one of the batteries with a 20 ...
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0answers
64 views

Power supply needs BASED on usage plus 35%

I'm DIY'ing a RV van. What is the best power supply setup for a 8kW maxed out load plus 30%? I realize that this is a lot of power. I am trying to keep it self-contained and self-powered. Current ...
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0answers
35 views

12v dc motor off and on continuously

Hope someone can assist me here... I have a 12V DC motor that works fine when connected to a battery source, but when connecting it to a 12V 3A wall adapter, it starts and stops repeatedly. After a ...
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1answer
53 views

Will a stereo amplifier with a power supply range of 12V to 25V DC run off a 12V car battery?

If an amplifier has a power supply input range of 12V to 25V will it actually run off a 12V DC battery system such as a 12V solar system? Here is a link to an example amplifier: https://fosiaudio.com/...
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1answer
51 views

Is an 'Or' circuit what I'm looking for?

12V DC 10-30 amps, dual input relay. Should this be an 'Or' circuit? Back Story - classic car, currently completing an EFI conversion, which is more or less separate from my quest, but it initiated ...
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0answers
32 views

Need to move a 12v DC, 1.5 ohm resistance circuit (power window motor) into another vehicle with a .8 ohm motor

In the past, when I have tried to cut down the voltage from a variable solar panel into a DC motor with a 10 watt resistor, the resistor always got too hot. This case is a somewhat different; a solid ...
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2answers
57 views

wire gauge for prototyping board

I am learning to do electronics making a things like a 3d scanner and a CNC. I want to make my own board to control the steppers and I have got the stepper drives, prefboard, arduino, etc. The only ...
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0answers
35 views

Problem feeding an ESP8266 and RGB 12V led strip from single source

I have an issue while was trying to feed an ESP8266 nodemcu v3 lolin and a RBG 12V led strip from the same source. When I try to use the same source, I am unable to access this ESP8266 webpage, as ...
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1answer
50 views

What gauge size and fuse should I use?

I've purchased a Thlevel Car USB Charger Socket to install in my 12v system campervan and I'm confused regarding the fuse and wire I need to use to wire things together. By my calculations, given that ...
2
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1answer
100 views

12 V relay switch wiring

I had some heated seats retrofitted to my car. I have wired them so that a 12 V ignition signal activates a relay and powers a bus bar which then powers the seats. The switches are round ON-OFF-ON ...
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1answer
71 views

Buck converter alternative 12V --> 3V

I'm looking to reduce a battery supply voltage into a LILYGO T-Call and don't have a buck converter but do have lots of resistors and a few other components at hand. I'm ideally looking for the ...
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1answer
54 views

Mux gets damaged the moment power is on. How do I know that cause of this? [closed]

I am currently using a mux, ADG1419, and i have had frequent mux failure the moment I turn on power; the power and the GND of the mux shorts after the mux gets damaged. My only assumption is that the ...
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1answer
81 views

Powering many external 3.5" HDDs (USB) by an ATX PSU

I have many external USB disks like this one, that I would like to power from a single dedicated ATX PSU, instead of one 12V power adapter per disk. Because each power adapter would take one power ...
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0answers
43 views

Control DC motor from very low RPM (10) to high RPM (1200)

I'm trying to make a DIY Wash & Cure Station for my resin printer, part of the design involves and very slow rotating platform for curing (around 10 RPM) and a high RPM (around 1200 RPM) spinning ...
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2answers
56 views

Measuring parallel resistor without current

I am trying to read the temperature sensor in a car with a Raspberry Pi. The temperature sensor's resistance changes as the engine temp increases however the temperature sensor would be in parallel to ...
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0answers
26 views

Can't find suitable Bistable/Latching 12V DPDT Relay

I have a 12V actuator that is controlled by a 12V programmable timer. So my pulse is either power or no power. I am using a regular 12V DPDT relay which works fine. However, I would like to use a ...
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1answer
52 views

What module do I need, to make a light stay on for 2 minutes and then turn off? [closed]

I have a quick question. I am trying to create a box where the button is clicked; the light comes on for 2 minutes. I am using a 12-volt battery to power this. I want to know what module I need for ...
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2answers
97 views

General purpose diode between 2 power rails

I am looking at a schematic where there is a general purpose diode connected between the positive side of a 5V DC rail to the positive side of a 12 V DC rail. The circuit is powered by a power supply ...
2
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1answer
131 views

How to convert 12 V DC to 12 V AC 50/60 Hz PSW?

This started with me trying to power 12 V AC LED swimming pool lights - which are always spec’d as AC for historical (and consequently safety certification) reasons - from a hefty 12 V DC leisure ...
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2answers
71 views

Problem controlling common cathode 12V RGB LED

I want to be able to control an RGB LED with common cathode and I've used the circuit below for each colour. For some reason there is 12V on the output all the time and I can't control the LED as it's ...
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0answers
48 views

Automatic switches for a 12 V LED with two separate power sources

I am converting a Mercedes Benz Sprinter van into an RV. I have a 12 V LED dome light (actually several) that activate when a door is opened, powered by the vehicle's power system (battery/alternator) ...
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0answers
50 views

Solenoid 12 V control with Arduino

I have some 12 V solenoids and I want to control them via Arduino, but Arduino outputs a maximum 9 V voltage through the Arduino jack input, and the voltage on Arduino pins is only 5 V, so how do I ...
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3answers
191 views

Will this shottky diode circuit protect my ADC, and if so, are there options with more than 2x channels?

I am trying to read 8x 12VDC digital inputs and 4x 5VDC analog inputs with my 3v3 Teensy 4.0 Microcontroller. In V1 of my design, I used a voltage divider circuit to drop down to 3v3. I would like to ...
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0answers
45 views

How many Ah do I need for 12V battery to power 76 LED lights (0.84watt each) using a 500W inverter to power for 6 hours?

Looking to build a power pack with a 12V battery to inverter in order to power 4 string lights totaling 76 LED bulbs each with 0.84 wattage. Total time to keep lights on is 6 hours. How many Ah do I ...
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1answer
58 views

12 volt kid car charging

Kid car use a 12 volt batterie, that need to be charge. We need to Open the front car motor cover and unplug the connector for the batterie and plug the charger direct to battery for charging I would ...
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1answer
72 views

Length of wire to calculate its power losses

Let us say I have 12V DC battery and I am using 10m long wire to connect my load with it. Now if I want to calculate power losses in the wire then should I use wire length as 10m or 20m (since there ...
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0answers
27 views

Will USB-PD work with and extension cable in the circuit?

I want to replace the USB type A port on my trucks dash with a USB-C panel mount and give it the ability to "fast charge" my phone. Unless there is a product that I am overlooking it seems I ...
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3answers
69 views

Wiring for solar powered house [closed]

I am trying to design electrical wiring for a small 1-bedroom house which will be only powered from solar panels. The minimum appliances in a house would be: Appliances available in 12V DC: LED ...
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1answer
50 views

Figuring out ATX Power Supply max output

I have a Delta DPS-400AB-17B power supply, and I am planning to change over some of the connectors to different ones. I want to make sure I don't overload any of the 12v 18awg wires, so I am figuring ...
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0answers
43 views

Device, Circuit, Component to Manipulate a Relay and an LED Light - Open to Any Ideas

This is my first post, and I am electronically illiterate - have mercy on me.... THE PROBLEM: Dealing with an automotive +12V system - and I have a new voltmeter that I'd like to install. In addition ...
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0answers
242 views

Triggering 12v Relay with HC-SR501 PIR sensor

I have a SRD-12VDC-SL-C relay with this configuration: https://robu.in/product/1-roadchannel-relay-module-light-coupling-12v/ And I want to trigger it with PIR Motion Sensor Detector Module HC-SR501 ...
1
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1answer
77 views

Is it bad to load one rail of a power supply vastly more than the other?

I am trying to modify a Delta DPS-400AB-17 server 1U power supply to support a desktop motherboard and graphics card. The power supply has an 8 pin 12V EPS connector attached to a 21A 12V (252W) rail. ...
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2answers
46 views

Relay for Solar System as Backup Only

Background I'm working on a seismic alert network and seismograph station at my school in Puerto Rico. We're building a solar system for the system to continue running during a potential seismic event....
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2answers
70 views

5v to 12 Power Supply

I have really no idea about electronics. I am trying to provide IR lighting for my night camera that I use with the raspberry Pi. The Pi is powered by a 5v usb power bank. The IR requires 12v. I ...
1
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1answer
75 views

Running 4.5v LED string from 12v leisure battery [closed]

I have a string of 20 LEDs designed to run from 3x AA batteries in series. I plan to hook these up to a 12v leisure battery. Until recently I had always concentrated on getting the voltage right (...
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2answers
81 views

How does one use a transistor connected in either series or parallel with the load in a linear regulated power supply?

Let's say using a transformer and a rectifier to bring the voltage supply to roughly 18 DC (little voltage ripple which solved by using polarised capacitors) and I use a LM7812 regulator to bring down ...
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2answers
51 views

How a little extra current can affect a motor

I want to run a 12V, 19 watts DC motor. Which should use 1.5amp of current. Now, I have a 12v DC, 2 amp power supply adapter. How it will affect the motor in the long term. Will it burn the motor for ...
2
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1answer
88 views

Modify PCB Mains Voltage input to 12VDC

One of my amplifiers has died so I need to find out if I can hookup a spare I have lying around as per "Section B" of the below block diagram. I have done the same modification before on ...
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2answers
78 views

12 AWG galvanized steel high tensile wire okay for running 12 volt 7 A DC?

I need to run 12 VDC about 50' along a fence that already has several 12 gauge galvanized steel wires running on it. It is going to be pulling less than 7 A at most. I can make sure the lines are not ...
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1answer
20 views

Connecting 2 identical led RGBW controllers with 12V led strips same length into a 24V Power supply [closed]

Ok, some bad decisions took place and now i am stuck with no money and: 24V 8.33A power supply with 2 channels. Magic Home 5V-12V-24V RGBW wifi Controller 192W max (got them from here) 15m of 12V ...
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0answers
71 views

MOSFET as PWR/GND DPST Switch

I have started trying to replace relays in my (12V) electrical circuits with MOSFETs. I have somewhat limited experience with MOSFETs, but I think I'm starting to understand it more. I've drawn a ...
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0answers
49 views

Is it safe/possible to add a BMS board to a soft pack 3s1p LIPO for charging and discharging?

i would like to make a 12V battery pack from a soft pack LiPo which can supply 10A for my projects which i can charge from a 12.6V DC wall powersupply. I dont want to use an external big special BMS ...
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2answers
150 views

Way to calculate the dangerousness level of volts+amps? (don't want to learn the hard way) [duplicate]

Is there a formula to calculate the dangerousness of amps, and volts? like watts, for example. Watts = Volts x Amps. Generally speaking, you could say wattage takes into account volts, and amps. I am ...
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1answer
98 views

Switch 12V with 3V control circuit

Edit: I did a dumb-dumb. I got the emitter and collector mixed up on both transistors. Now it works. What I'm trying to accomplish: I'm planning to run a ESP8266 microcontroller in my car. The ESP ...
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0answers
102 views

Powering two 19v devices from a single 12V to 19V converter

I am building a laptop charger to run off of a 12V source (lithium batteries in a camper). Initially, I was just going to replicate this article to make a 12V MagSafe 2 charger for my MacBook Pro (up ...

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