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Questions tagged [12v]

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Car button - Switch current impulse to relay

I will add momentary push button to car infotainment panel (instead of blank). It's VW/Audi original button which I want to use to switch relay (ys-rt1c - Timer delay turn off) to supply 12 V for rear ...
Jason's user avatar
  • 1
0 votes
1 answer
42 views

How do I connect a 12 V 9 Ah battery to a 12-15 V LED photography light? [closed]

I want to make my LED lights portable. The lights are rated at 50W output. Input is 12 V. I would like to know if connecting them to a 12 V 9 Ah battery is possible. If not, is there an alternative ...
JoMalcom's user avatar
0 votes
2 answers
29 views

Drop voltage from 4s Li-ion (16.8v) to 15v and lower for 12 DC-AC Inverter

I am making a high capacity battery bank that uses a 4s Li-ion cells from a car manufacturer. With Li-ion there is no 12v direct drop in replacement as it ranges from 16.8 full to 12.8 empty. So here ...
user3243621's user avatar
7 votes
2 answers
2k views

What is this connector called and are they commonly used?

I'll probably end up just cutting it off but I'm kind of curious now. I found it on a 12vdc water pump.
totalconfusion's user avatar
0 votes
0 answers
80 views

Need more positive than negative current

My power supply collapses due to uneven positive and negative current draws. I need about 2A of +12VDC, 1A of +9VDC, and 0.5-1A of -12VDC in a design I’m working on. I’d like to avoid using multiple ...
Axemurder1's user avatar
-1 votes
2 answers
99 views

Can a single buck converter be used for converting both 12V and 24V input to a constant 12V output DC to be fed into a 12V DC motor?

My target is to design a low-cost PCB to run a 12V DC motor. I do need to have 2 input sources, a 12VDC and a 24VDC. What is the best way to achieve this using a single board? Can I use a single buck ...
Adithi's user avatar
  • 3
-1 votes
4 answers
69 views

Need Outdoor Application Power Transistors [closed]

I am looking for preferably readily available power transistor technologies that are adequate for high humidity and extreme environmental temperature fluctuation. This is because they will be in a ...
Termini's user avatar
0 votes
0 answers
51 views

12V relay to disable a circuit while starting

I’m looking for a relay for testing purposes. Not exactly sure what relay I need.I want to disengage ignition coil circuit when the starter solenoid is engaged. I am figuring that I’m running a wire ...
Bruce Trautman's user avatar
0 votes
1 answer
40 views

Can t get my 12V DC compressor working using a 12V battery [duplicate]

I don't know anything about electronics but I can tell that a 12v Battery can normally power a 12v DC compressor (as shown in the picture) unfortunately it doesn't work (but it does when its plug to ...
ZavtaR's user avatar
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0 votes
0 answers
102 views

12V PWM signal circuit configuration

I am a student learning motors. The motor I want to make requires a circuit diagram. The input 12V PWM signal goes into 5V LEVEL, and the LDO 5V MCU 5 OR 3.3 V goes into the motor driver and operates ...
제태용's user avatar
0 votes
0 answers
84 views

How to eliminate relay buzzing when turning on and off

I'm using one of these relays to power some LED's using a trigger wire that outputs either 0V, 50mV, or 12V. The relay has a low voltage trigger setting that turns on when there is anything less than ...
GoleeMD's user avatar
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0 votes
0 answers
85 views

Trying to power a 12 V LED underglow system using PWM signal from dome light

I've learned a lot from the brilliant minds on this forum so far, and I think I've narrowed my original question a bit. I'm trying to create an entry light effect in my car using my LED underglow ...
GoleeMD's user avatar
  • 51
3 votes
1 answer
309 views

12v LED lights powered by 2 different circuits

I am wiring some automotive LED lights (underglow), and currently have them wired from the 12v ACC power (on when ignition is on), with a 5-pin illuminated on/off rocker switch on the dash. It works ...
GoleeMD's user avatar
  • 51
0 votes
1 answer
83 views

Kicad telling me to connect pads together when I feel it's incorrect

Hey all I am wondering if this is the correct way to trace a fuse holder on my pcb. I would imagine that the top 2 pads connected to each other and the bottom 2 pads connected to each other. Running a ...
StealthRT's user avatar
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0 votes
3 answers
261 views

Switch on resistance

I already spent quite some time looking at the forum's search feature, but cannot seem to find an answer. My challenge is the following, I have two batteries that are joined or separated by a switch. ...
DJQ's user avatar
  • 11
0 votes
3 answers
100 views

Switching 12 V when power is on/off from a 4.5 V source

Is there a switch for 12 V that will turn off/on when power is either off/on from another source? Example: I have an LED controller for lights. It only pushes 4.5 volts, which won’t supply all my ...
Tristan Durbin's user avatar
1 vote
0 answers
91 views

Proper circuit for a solenoid being triggered by a relay with occasional misfires

12V relay question… I built a homemade pinball controller for my PC using a standard, 5 V USB encoder for the controls. I wanted to add some haptic feedback, so I decided to add a few 12 V solenoids ...
KillerQ's user avatar
  • 11
0 votes
2 answers
81 views

12V – DC wire gauge | Does length calculation ‘reset’ at socket/ junction?

Sorry in advance that this is a basic question which is pretty obvious. I’ve just been struggling to find a clear answer and wanted to confirm. I’ve set up a 12 V leisure battery system in my van to ...
macleod92's user avatar
3 votes
3 answers
1k views

Using Linear Voltage regulators in parallel for a high current load

I need to build a high current 12 to 5 volt regulator. This will power neopixels, which draw 60mA each, and we have like 800 of them, so around 48A when all of them are on at full brightness and white....
Juan010's user avatar
  • 41
2 votes
0 answers
40 views

2 xLM324N lead battery charger fail. Images added

i have a Lead Acid battery charger that was given to me since its not working. I have no 12volts output neither any led on. Schematics do not appear after hours of google search So far ive tested ...
Cabe72000's user avatar
0 votes
1 answer
49 views

First PCB design - remix of PCB I found already on the market with some 12V DC jacks - any advice?

I created my first PCB design - its a remix of PCB I found already on the market with some added 12 V DC jacks and XH-2A jack - this will only ever be used with 12 V up to 2 A - wondering if there are ...
Dieskim's user avatar
  • 101
2 votes
2 answers
72 views

Can these timer switches (relays) handle DC or will they arc?

I'm looking to add timer functionality to a 12V agricultural project. It's to turn a light and heat mat on and off at the appropriate times. I was kicking around eBay and found a few timer switch ...
totalconfusion's user avatar
0 votes
0 answers
185 views

Should the DC-DC and solar charging go through the main fuse or dedicated fuse?

I am planning a 12V dual battery setup to be used in a car. The aux battery is a LiFePo4 battery and it will be charged via a combined DC-DC and solar charger (50A, fuse 65A). I want to add a fuse and ...
Alex's user avatar
  • 1
1 vote
1 answer
75 views

What Capacitor do I need? (if any) [closed]

I have a airplane with a radio and other electronics. When I transmit on my radio the voltage drops about 0.3 volts across my other electronics and causes some sensitive sensors to read incorrectly. ...
AirSven's user avatar
  • 11
0 votes
0 answers
64 views

Basic Wiring Help

I’m an individual that likes to tinker around with things and I’m asking for help. I’m in the middle of a car audio system update. I currently use a basic relay as a “turn-on” switch for my ...
Rick's user avatar
  • 1
1 vote
1 answer
86 views

Looking for a circuit to run a 12 V toilet exhaust fan when utility power fails

I have a tiny house. Recently my inverter failed and it could take weeks or months to have it fixed. It's a 48 V DC solar to 240 V AC, that is intermittently working with a non-working 5 kWh battery. ...
LeoTehJester's user avatar
3 votes
2 answers
438 views

If I use a line shaft running off of a waterwheel in a creek, is AC or DC more useful? I have a generator that produces both

I am trying to get the shaft to run at 3600 rpm. I don't know if it will slow down much under a load. Would the AC be too unstable or would it be better to use a DC battery bank with an invertor?
TimK's user avatar
  • 31
0 votes
0 answers
112 views

555 timer with 12 V LED pulsing

I have been making a pulsing LED circuit and I have a 12 V LED strip and a 12v supply. I need bright LEDs for my project but the issue is that my 12 V LEDs don't work because the base of Transistor 1 ...
parpar8090's user avatar
1 vote
3 answers
116 views

How can I block low voltages (around 40 mV) but allow higher voltages? [closed]

So, I'm wiring up some LEDs on a vehicle and am running into an issue where a wire that is supposed to be unpowered when switched off is putting out a constant 0.04 Volts. Is there a way to create a &...
Matt's user avatar
  • 11
0 votes
2 answers
114 views

What MOSFETs should I use in this configuration?

Here is a configuration of MOSFETs which I believe allows for two different sources to supply power to the same load. This diagram was originally found here. The primary source is connected to the ...
Georgia088's user avatar
0 votes
1 answer
285 views

Power ORING Circuit switching

I am creating a circuit that will have two separate 12v batteries as the source. Only one of these batteries will be used at a time and I need to isolate the other when it is not in use. I will use ...
Georgia088's user avatar
0 votes
0 answers
73 views

What size capacitor and or components do I need to run 12V starter motor with solar panels as power and relays for switches

I'm trying to use solar panels to operate a DC 12-volt small starter motor at slow speed to rotate my solar panels towards the Sun automatically. The size of solar panels that it take to power the 12 ...
WizardDave's user avatar
1 vote
4 answers
132 views

Controlling one relay with three LEDs - energize relay if any one of the three LEDs are lit

I have three 12V indicator LEDs which are the simplest way to see if one of the three circuits is 'ON'. Only ONE of the LEDs can be ON at any given time. They all share GND and a controller sends POS ...
revive's user avatar
  • 113
2 votes
0 answers
172 views

Device not working after 12V to 5V buck converter

I'm kind of upcycling an old radio with radio, Bluetooth and cast features. The Bluetooth module and the amplifier for the speakers work with 12V so I chose a 12V power supply. It works well. When I ...
Charles's user avatar
  • 21
1 vote
1 answer
41 views

Interface higher voltage signal to 5 V pull down input signal circuit using discrete hobby components

I have a microcontroller, TTL logic that expects its input to be connected to the ground via a brake lever to tell the microcontroller that the brake has been applied. I believe it uses an internal ...
Scott's user avatar
  • 286
1 vote
2 answers
77 views

Can I charge my two large 12 V bus batteries that add up to 24 V together with a a 12 V solar panel?

Just wanting some way to charge my bus batteries while parked for a long amount of time besides a battery charger. But am having trouble figuring out what kind of solar panel to get. My bus batteries ...
Eliza Smith's user avatar
2 votes
1 answer
220 views

What does a 9 A battery do to a 3 A motor when using the battery for movement?

I am trying to figure out why my battery keeps discharging so quickly. I have a 12 V, 9 Ah (valve regulated) SLA battery that I use on the bench to test motors. I write a small program, test the ...
De Funct's user avatar
  • 125
0 votes
1 answer
108 views

Control 12V 90mA alarm from 2N2222

I have an alarm rated for 12V 90mA. I want to turn the alarm on/off with a 2N2222. The base of the 2N2222 is connected to an ESP32. Circuit diagram is attached. Will it work?
ROBERT's user avatar
  • 3
0 votes
1 answer
148 views

Can I solder two 12 VDC fans to one end of wires of single Molex connector?

I have 2 Sunon fans (12 V, 415/519 mA - max, 5.4 W/6.22 W - max). I want to solder both onto the end of a single Molex connector cable extension (bought from a local store). Molex connectors all-4 ...
beginner2's user avatar
0 votes
1 answer
88 views

I need a 12v two way non locking toggle switch both sides must have a NC and a NO when switched on NC must open NO must close I'm not an electrician [closed]

2 way non locking toggle switch both sides NO & NC When switched NO must close NC must open
Guy Lombard's user avatar
0 votes
2 answers
98 views

Help with custom monitor 12 V adapter

I have an electrical question about a custom adaptor I want to build. The monitor im using: philips 258B6QUEB/00 https://www.philips.co.uk/c-p/258B6QUEB_00/brilliance-lcd-monitor-with-usb-c-dock It ...
Thomas Kramer's user avatar
0 votes
1 answer
76 views

Battery sizing question

I’ve got a 12 VDC vibration motor. It wants 2.1 A, listed as 30 W. I’ve also got a 12 V, 12Ah battery I know to be in good working order. Initial current is less than 3.6 A. Is that something that ...
Cape Cod Instafix's user avatar
0 votes
1 answer
108 views

12 V power supply for blower motor

I'm looking for a power supply to run a small propane RV furnace. The furnace only draws about 5 A while operating, to run its blower motor and the electronic ignitor plus the circuit board that ...
Josh's user avatar
  • 129
2 votes
1 answer
427 views

How to dim a 12V AC halogen

I have a couple of lamps, halogen I think. I bought them decades ago. When new they had a nice dimmer knob that led down to a transformer and I could dim the lights or, more usually, turn them off and ...
RogerParkinson's user avatar
0 votes
1 answer
86 views

I am building a circuit that operates at 5 V but I need to use SIM7600 module @12 V

I am building a circuit with an Arduino that operates at 5 V, but I need to use a SIM7600 module that will be connected to the Arduino's pins, and needs 12 V in order to operate. Will I have any ...
5Volts's user avatar
  • 175
0 votes
0 answers
352 views

Protect GPIO pin on ESP32 development board from accidental 12 V input

I'm working on a project which involves connecting in series a lot of small cut strips (5-7 LEDs) of WS2815 powered by a separate 12 V PSU. They are controlled by GPIO of an ESP32 Dev Module powered ...
serg's user avatar
  • 1
4 votes
3 answers
324 views

Battery-powered 3-5 V MCU, but 12 V solenoids. How to power?

I'm building a battery-powered safe cabinet hobby project. It uses the 32L152CDISCOVERY board. I plan to charge it with a solar panel. I should operate at least 6 months without maintenance. The MCU ...
Tuppe's user avatar
  • 41
0 votes
0 answers
169 views

Overvoltage protection for RS485 from DC-DC voltage

I am making a circuit to protect RS485 against 24V and 32V DC over-voltage. Note that my power supply is 12V. I've done my research and found solutions, but I can't fake it. More specification ,my ...
TLI_Y's user avatar
  • 1
1 vote
1 answer
216 views

What is a suitable resistor value for this circuit?

See the small circuit of a PIR motion sensor below. I've tried to find more than one circuit online but every single time it shows a different value for the resistor. I would be grateful if anyone can ...
Martiinii's user avatar
0 votes
0 answers
33 views

How to regulate a battery + solar panel setup so it’s under 12 V?

I am making a remote controlled driveway gate and the problem I’m having is the battery/solar panel together is putting out more than 12 V at times and frying my remote controlled relay board which is ...
Tim 's user avatar
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