Questions tagged [12v]
Deprecated tag. Do not use in the future.
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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.
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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?
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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 ...
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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 &...
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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 ...
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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 ...
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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 ...
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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 ...
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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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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 ...
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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 ...
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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 ...
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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?
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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 ...
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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
