Questions tagged [12v]

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Lithium battery charging 24/7

I just got a E&J LiFePO4 Rechargeable Lithium Deep Cycle Battery 12.8V 18Ah Electrical Nominal voltage: 12.8V Nominal capacity: 18Ah Capacity @ 6A: 180 min Energy: 230 Wh Resistance: 40 milliohm ...
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1answer
56 views

Limit current drain from 12v7Ah Sealed Lead Acid Battery

I have a 12V 7Ah SLA battery which i use with my DC Fan motor (not sure about its voltage and current requirements may be between 12v to 18v). I use it with both battery and wall charger (non branded)....
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29 views

Buck converter remote terminal

I'm testing a LED setup, I have a bench PSU going to Traco 5V buck converter that feeds 10 LEDs (SK6812). When I power the bench PSU on, before it hits 12V, the first LED in the strip flashes for a ...
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1answer
45 views

24V optocoupler with 12V?

I recently picked up a "24V Voltage Level Current Converter Module 80KHz 1-Channel Optocoupler Photoelectric Optoisolator 12V PNP NPN Signal Converter PC817 Optocoupler" Can I supply this ...
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2answers
87 views

How to cheaply build a latching relay system to disable a circuit until power is cycled?

This is my first post here. I have an aftermarket backup sensor that needs to be disabled when I back a trailer. I want to be able to push a button to disable it, but have it be automatically re-...
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4answers
132 views

12V pulses into 5V pulses

I have a 12V pulse square signal coming from an RPM sensor. I would like to translate it into 5V pulses since I will need to use it as input in an Arduino. What do you guys think is the easiest way? ...
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1answer
44 views

plug light in without spark? [closed]

I have spotlights which go on 12V/24V distributor but every time I plug one in there is a spark, they still do work fine but it's a bit scary and just annoying when all the other ones flicker every ...
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2answers
93 views

Can I wire a 12V car battery to the 12v cigeratte lighter plug?

I have a van for summer travel and I am considering wiring up a car battery directly off of a 12V cigarette port which is rated at 20A by the car company. If both batteries were well charged at the ...
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1answer
59 views

Use household power strip for 12V/24V power

I have a 12V/24V dimmer (rated 60W) and need to hook up 8 different lights, can I just use a regular power strip to distribute the 12V/24V? the power strip of course says 230V on it, but does it ...
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2answers
341 views

LED with built-in resistor and voltage drop

I accidentally bought 12 V LEDs, so an LED with a built-in resistor (you can see it as a black dot on the anode). Now I measured the voltage and get after the LED still a voltage of 11.3 V, when the ...
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11 views

LIN bus extender

I have an application where the nodes may be 40m apart and want to make each node a repeater as well as an operating node with a microprocessor (PIC16F1829 say). Am thinking about two MCP2021A back ...
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38 views

Powering Raspberry Pi from multiple DC voltage sources

I'd like to have some method of powering a Raspberry PI 3b project from a variety of sources, whilst being backed up by a battery: Internal battery Car cigarette lighter Mains (via a DC adapter, like ...
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40 views

Options to control (fast switch) a 12V LED DC with MCU - mosfets vs. relays vs. SSR vs. mosfet relays vs. something else?

(Newbie alert) I have a 12V 3A light that I want to control in a ~12V DC circuit (lead acid battery, stator coil). The light shares a common ground with every other light unit in the circuit. I was ...
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1answer
64 views

Tachometer air core meter - how does it operate?

This is a question from a total noob, out of pure curiosity. I've been tinkering with my bike's instrument panel and took it apart - I found out that this sin-cos marking is the base of the air core ...
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1answer
62 views

Switching 12V vehicle headlights with Arduino / Mosfet combination

Ground level noob here, started to tinker with electronics at the beginning of this year after I couldn't get any electronics shop in my town replace my bike's gauge cluster SMD LEDs. I learned few ...
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62 views

Practical understanding of “tapping” into vehicle 12V battery / fusebox for power

Disclaimer: I did "tap in" and hooked things to my battery (on my car) many moons ago and did it without really thinking what am I doing, and I was probably doing it in a very hack/ghetto ...
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1answer
156 views

12v dual battery setup - wiring, grounding and busbars

I am installing a 2nd 12v battery into my van to run eletronic devices. The 2nd battery is a bank of 2x LiFePO4 12v 120Ah connected in parallel. My three questions are surrounding the circuit diagram ...
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2answers
57 views

24VAC to 5VDC or 12VDC Trigger - Maybe optocoupler?

What I'm trying to achieve is taking a 24 to 30 VAC signal from an HVAC thermostat and converting it to possibly a 5VDC or 12VDC Trigger Input to a what I believe is a optocoupler/isolator type relay. ...
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0answers
74 views

2N2222 NPN Transistor, no current flowing through collector

I have a 2N2222 NPN Transistor wired up in the most basic common emitter setting (emitter grounded, base hooked up with a 1k resistor to 5V, collector connected to load and load connected to +12V). ...
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2answers
99 views

MOSFET started to smoke when switching a 12V bulb - how can I troubleshoot the cause?

This is the case: 12V bench power supply (current limited to 3A) wired to a 30W LED bulb (H7 bulb for vehicles), controlled by an Arduino via the gate of the 2SK1363. The signal from the Arduino was ...
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1answer
64 views

Wiring two separate circuits with separate loads (one with mosfet and Arduino) with a single bench PSU

I have a cheapo bench PSU with one pair of terminals on it and I am trying to wire the pictured circuit correctly and in best possible practice. As my description on the schematic says, one LED device ...
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3answers
75 views

Running a 12v fridge and protecting the battery from low voltage

I want to run a 12V (65W) fridge from a battery circuit on a boat. However, I want to protect the battery from being drained and potentially damaged by the fridge if the voltage drops too low so I ...
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1answer
56 views

battery low voltage cut off breaker (manually reset)

First off, I am aware that premade devices like this exist however I have been unable to find any that fit my exact needs which are as follows. 0 power draw when in the off state Minimal voltage drop ...
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4answers
206 views

12V LED radial wiring

How do I install the 12V equivalent of a radial/lighting circuit? I am about to renovate a small 40m2 apartment. I do not want to touch the existing 240VAC cabling at all. I am looking to have ...
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2answers
75 views

Switching 12V with Arduino Nano

I am trying to design a circuit to switch 12V 90mA on/off using an Arduino Nano as the trigger. Is there an optocoupler/transistor/MOSFET that can tolerate 12V at 100mA on the load side while still ...
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4answers
225 views

Can I turn on a 12V relay with 5V supply, just by changing a resistor?

I have been trying to run a W1209 module with 5V instead of 12 volts. My application is heating a small component to 70 degrees of Celsius, mostly using a power bank or a mobile charger (Hence the 5V)....
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1answer
47 views

Is this a standard power connector? (from Victron Energy 12V battery charger)

I am trying to find out whether I can buy this connector. I've browsed Victron Energy's manuals/specs and can find no mention of the connector name. Spec sheet PDF Note that one of the corners of the ...
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2answers
67 views

Battery imbalance - two 12v lead-acid 100ah in series

I have just installed two brand new 12v lead-acid batteries in series to for my 24v “house system” on my boat. I connected them to my 24v charger to ensure they were charged to 100%, to synchronise my ...
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1answer
122 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
74 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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3answers
96 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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3answers
114 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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4answers
110 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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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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42 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
56 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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59 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
58 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
76 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
53 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 ...
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1answer
102 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
73 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
69 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
167 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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53 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
60 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
33 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
121 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 ...

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