Questions tagged [12v]
Deprecated tag. Do not use in the future.
92
questions with no upvoted or accepted answers
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Using the frame of an RV trailer for the ground
I have an RV travel trailer that I use a 2000W generator to supply power to the 30A incoming power socket. I have also added 2 × 100W solar with battery minder, a 3000W sine wave corrected inverter ...
user158568
2
votes
0
answers
40
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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 ...
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2
votes
0
answers
177
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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 ...
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2
votes
2
answers
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12 V initial to lower voltage continuous step-down circuit
How do I design a step-down circuit that hits 12 V initially, but then drops the voltage for continuous use until turned off?
I have a line lock solenoid that requires 12 V to activate. The ...
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0
answers
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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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2
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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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2
votes
1
answer
394
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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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2
votes
1
answer
160
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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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2
votes
1
answer
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Generating +65 V (positive) and -65 V (negative) voltages from two 12 V batteries using cheap step-up converters?
I need to power a 300 W class D amplifier with positive and negative 65 V.
As I'm a do-it-yourself guy, I didn't know about positive and negative voltage and ordered a bunch of these normal step-up ...
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1
vote
0
answers
102
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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 ...
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1
vote
1
answer
252
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Replacing a 12 V, 19 Ah lead-acid battery with a 12 V LiFePO4 battery
I have a Stanley PPRH7DS battery charger that came originally with a 12 V, 19 Ah lead-acid battery. This battery has since given up the ghost and I am looking to replace it.
Last summer I constructed ...
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1
vote
0
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116
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Adding 12V power supply to existing Solar MPPT load circuit
I have a camper which has a small 12v power system consisting of a 50w solar panel, a generic 20ah LiFeP04 battery, an a 15A Victron MPPT controller whose 12v load output feeds directly to a fuse ...
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1
vote
4
answers
387
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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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1
vote
0
answers
718
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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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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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