Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [12v]

Deprecated tag. Do not use in the future.

Deprecated tag. Do not use in the future.

669 questions
51
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8 answers

Can a 12V battery give you a shock or not?

I am reading a book called "Make: Electronics" and, on page 9, it says: "Anyone who has dropped an adjustable wrench across the bare terminals of a car battery will tell you that short circuits can be dramatic at a "mere" 12 volts, if the battery is…
Bitcoin Cash - ADA enthusiast
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votes
3 answers

Explain the logic of a 12 V to 9 V conversion

How does the below circuit work? I know what resistors, capacitors, and transistors do and have played with them on a microcontroller board, but am I trying to understand the logic of the circuit. I assume there is a relationship between the 22 ohm…
stack web
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3 answers

Using a 12V battery while simultaneously charging via solar panel

I have a couple of 12v batteries that I'd like to use to power a cooling apparatus while camping for several days. I also have a 15W solar panel I'd like to use to top-off the battery. Can I use the battery while it is charging? Or would I have to…
nimble
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13
votes
9 answers

12 V car battery short circuit with a wrench that has resistance of 0.5 ohms, how much current?

ANSWER/ERROR FOUND: resistance of the leads of the multi-meter is the culprit. The true resistance of the wrench cannot be measured using a basic multimeter. The resistance of the wrench is more so roughly around 0.000016 ohms. I searched quite a…
Satz T
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8
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4 answers

Detect car +12V using Arduino

I am looking to detect 12+V from a car wire using an Arduino. I have found the following schematic: I know how crazy automotive voltage can get so I just want to make sure the schematic I found above will accommodate the crazy random currents that…
StealthRT
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8
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4 answers

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.
Philbus
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8
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9 answers

Using a 12 V 3 A bilge pump on a 12 V 8.5 A LED power supply

I recently bought the following for a grey water system project I'm working on: 3 x 12 V, 3 A bilge pumps 1 x 12 V 12.5 A power supply I'm not an electronics expert, so my assumption was that the power supply should easily power the bilge pumps.…
Techedemic
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8
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2 answers

How can I model a relay in LTSpice IV?

I would like to use a 12V relay in my LTspice circuit, however there is no relay in the component list. How can I do? Relay model: SRD-12VDC-SL-C
mickkk
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8
votes
2 answers

How to make -12V from a +12V supply?

The equipment I have needs +5V +12V and -12V supplied to it. The old PSU which provided all the voltages blew to bits. I have sourced a PSU1 +5V (30A), and PSU2 &PSU3 (two identical +12V (2A) stand alone supplies). Am I right in thinking if I link…
user40442
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8
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1 answer

Replacing incandescent bulbs with LEDs, unexpected behavior

I have an over-the-stove microwave/hood vent combo with 2 adjustable-brightness lights. The lights appear to be 12V lamps with a G4-style connector, and they burn out too often. I decided to go with LED to reduce the maintenance. I bought 12V LED…
Jeremy Holovacs
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7
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3 answers

DIY 12 Volt UPS

Hi i am trying to make a UPS for a project that requires 12Volts. I'm currently using a replay diode and capacitor. My problem is that when the switchover occurs, the voltage drops from 12Volts to 7Volts, and back up again. Does anyone have a…
littlebirdceo
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7
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3 answers

What are the standard connectors used on 12V hobby batteries?

I'm looking for a right-angle PCB board mate for the standard 12V hobby battery connectors. Where can I find these connectors?
Jason
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7
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2 answers

Arduino Uno with 12V pump: transistor or optocoupler+12V relay?

I'm not a real expert in electronics but I'm going to start a new project that has completely captured me. I need to drive a 12V pump with my Arduino Uno. The pump is "Dp0102" (12V, 0.7A). To power up the pump I wish to use an external switching…
8bit_Biker
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6
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3 answers

Can you run low voltage current through galvanized steel suspension cable?

The fact that I can find hardly anything about running current through galvanized steel suspension cables on Google should probably tell me I shouldn’t do it, but I thought I’d ask here anyway. I’m messing around with some DIY hanging lamp ideas…
Ryan
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6
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3 answers

Discharge time of 12 V 8.4 Ah at 5 mA

I have a motorcycle battery rated as 8.4 Ah (20 HR). It also says 8 Ah (10 HR) and I am not sure what the difference is. Anyway, I have a GPS tracker fitted with a rated consumption of 5 mA. According to this formula I have to divide battery…
daviddgz
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