Questions tagged [24v]
Deprecated tag. Do not use in the future.
118
questions
0
votes
1
answer
63
views
MAX809S not working with a voltage divider on input
I am trying to get a MAX809S IC to work with a 24 V supply. The MAX should trigger at around 2.93 V at its VCC pin and turn the RESET pin high. Because the MAX is only rated at max. 6 V at the VCC pin ...
0
votes
1
answer
44
views
HVAC control & Low Voltage Wiring (24v to 10v) [closed]
I am a GC having some exhaust fan control issues I am hoping someone on here can assist with. My mechanical and electrical contractors are stumped as well.
We have a Vari-green 2 speed controller ...
0
votes
0
answers
100
views
Running a 3D printer, LED strip, and fan from a 24V PSU
I am working on a project to design an enclosure for my 3D printer. The enclosure is designed, but I am looking for some guidance/suggestions on the electrical side. I plan to add a few strips of 24V ...
0
votes
1
answer
93
views
24v Electric car kiddie regen brake issue [duplicate]
Looking for some help please. We manufacture small off road Land Rover Defenders for holiday parks and the likes. Up until recently these cars have run off 3x 8v lead acid batteries with a ...
0
votes
1
answer
57
views
Can I make a regulated power supply that has two different output voltages?
Can I use a single 24 V, 110 V / 220 V AC to DC universal regulated switching power supply to power two different components? One which requires 12 V and the other which is 14.8 V?
I have a project ...
1
vote
2
answers
62
views
How to approach controlling multiple sets of solenoid valves?
Please excuse me for asking basic questions as I am a newbie in this field and learning as I go.
I have a project that requires simultaneous functioning of two solenoid valves. I require three sets of ...
0
votes
0
answers
52
views
24 V Door Bell Modification
I'm looking to create a custom doorbell and am looking for advice. I am retrofitting a traditional 24 V doorbell system. My output I'm looking to get when you depress the doorbell is 5 short bursts of ...
2
votes
2
answers
159
views
Keep Relay Closed for 10 ms after electricity stops
I have a non-latching relay and I provide a voltage (24V) to close the relay. However, I want to keep this relay closed for 10 ms after I stop providing the 24V needed to close the relay. The relay is ...
1
vote
0
answers
53
views
LED circuit with an AL1793
I'm currently making my own light fixture, a multicolor Par light to be exact (and a few other types once this is successful). Now I'm trying to control a string of 6 multicolor LEDs. The circuit will ...
1
vote
2
answers
58
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 ...
4
votes
5
answers
2k
views
How to power a 24 VAC pump with 24 VDC?
I want to power a 24 VAC vibration pump (48 W 50/60 Hz, often used in coffee machines), and control it with a microcontroller. I've got an existing system that is powered with 24 VDC. A standard DC-DC ...
0
votes
1
answer
214
views
24V I/O (PLC) to 3.3V interface with opto and PCF8574
I am more of a software guy, and I want to make sure my design works before sending it off to fabrication.
I need to interface with 24V PLC I/Os. I want a simple design for now, as I can add ...
0
votes
1
answer
142
views
What is the 2 W resistance in the regulator input for?
What is the purpose of R1 (120 Ω, 2W)?
When the voltage drops from 24 V to 5 V, a lot of heat is generated in the 78L05.
Put a resister on the 78L05's input. Say we need 5 V, 100 mA output from the ...
1
vote
0
answers
152
views
Will this 24 V relay driver work?
I am not sure about the 24 V which drives the transistor base. Is this circuit correct? Do I need some modifications?
The current rating for D2 is 200 mA. Is that high enough?
0
votes
1
answer
70
views
Monitoring 24V LED stack tower lights status
I am working on a project based on Arduino, but currently stuck.
I have three 24V lights to monitor, sent by a tower wired to a machine. My idea is to use a relay to convert first 24 voltage to 5V, so ...
1
vote
1
answer
125
views
Unexpected (too low) power consumption for a 24 V 1 meter LED strip
I have a LED strip configuration that basically works, but when measuring something doesn't add up.
The strip is 1 meter, 60 LEDs (SMD5050), 24 V, claimed as consuming 15 W per meter. When I google ...
1
vote
2
answers
459
views
Non-inverting switching 24 V with 3.3 V signal using a MOSFET
We have a reset circuit used in a peak-hold amplifier. Under normal conditions, a capacitor on the peak-hold circuit is grounded by RST1 (see circuit).
P0-0 is a fixed 24 V voltage from the supply.
...
1
vote
2
answers
495
views
Does a 220V AC fan emit much more EMI noise than a 24V DC fan?
I've been discussing this with other colleagues for some time now and we can't reach a conclusion. Also searched on internet but didn't find a good article or proof that in fact a 220V AC fan will ...
0
votes
0
answers
386
views
Can a PWM solar charger use a battery as the source?
For background, I am slowly migrating from 12v to 24v, but want to use my existing 12v inverters if possible, by having a 12v battery kept topped-up by the 24v batteries.
I have a decent MPPT ...
0
votes
1
answer
649
views
I want to control 24V relay with NVIDIA Jetson
I have NVIDIA Jetson Nano Developer. I want to control a 24V relay with Jetson pins but I am undecided on which method to use. (Transistor, MOSFET)
The other thing to know is that Jetson pins work at ...
0
votes
2
answers
65
views
Replacing LEDs connected to 24 VAC
I need to replace 2 blown LEDs in a keypad module. They are connected in series with a 240 ohm resistor to a 24 VAC supply. What LEDs should I choose? Something with a forward current of 100mA? Do I ...
0
votes
2
answers
180
views
splitting ground plane
I have a 4 layer board, where I have a 3.3V STM32 and some 3.3V components, and also a 24V H bridge to drive a 24V DC motor. The board is supplied with a 24V DC power supply, the 3.3V is created by a ...
0
votes
1
answer
891
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 ...
-1
votes
1
answer
70
views
Looping on/off switch (10 s on, 0.5 s off)
I bought a 24 V shower booster pump,
and it has this crazy behaviour that it shuts down after 10 - 12 seconds.
When I restart the pump, it starts again for 10 - 12 seconds.
It is useless now and ...
0
votes
1
answer
62
views
Identify 3 states at the input - Automotive circuit 24V system [duplicate]
I have a requirement to build a circuit which can identify 3 states at the input and the output is given to ADC of uC. I have the below circuit for 12 V systems:
The input can be connected to gnd, ...
0
votes
0
answers
464
views
LM2596S-5 Circuit, 7.x V instead of 5V output voltage. What did i do wrong?
for a little project of mine i need 24 and 5 Volts on my PCB. To do so i want to step down a 24V supply.
I planned to use the LM2596SX-5.0/NOPB for this task and designed it with the TI Webench Power ...
0
votes
1
answer
511
views
RS-485, 5Vdc and 24Vdc over a single Ethernet cable
I recently started to work on a project that involves motor drivers and microcontrollers in a network topology. This is rather a theoretical question, just something that I was thinking about. The ...
1
vote
1
answer
2k
views
230V AC to 24V AC Transformer Wiring (Black, Red, Brown, Brown)
I'm setting an irrigation controller and I need a 24V AC source to switch the irrigation solenoids.
Since I have 220V AC, I asked the electrical store for a 220VAC to 24VAC transformer and they gave ...
0
votes
1
answer
128
views
2 x 90 Ah 12v deep cycle batteries in series runs 77-90w for under 20 minutes. Why?
I am trying to understand the maths here. I have 2x90Ah 12v batteries in series (24v) and they are powering my computer. The peak power is 120w while the computer is shutting down during a power loss. ...
0
votes
2
answers
568
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. ...
0
votes
0
answers
149
views
Automotive 24v TVS suppression Question & feedback
Iv been contemplating which approach for voltage suppression for a 24V system.
the parts in consideration are
RBO40-40G//
TPSMD20A || TPSMD251A//
PNS40010ER,115
Load Dump
for the one on the top ...
0
votes
3
answers
769
views
Driving a 12V-24V 20 ohm solenoid from a 24V 0.5A input signal
I had a question about trying to get a solenoid with 20 ohms resistance to power up from a 24V Power supply limited to 0.5 amps.
I tried connecting a 10 ohm resistor in series, to drop the driving ...
2
votes
3
answers
2k
views
Wiring a simple 24v DC light on an output terminal on a PLC
I am using a Micrologix 1100, part number 1763-L16BWA. I have been able to get the input side working, but can’t seem to figure out the wiring for the output side. I also have an 1762-IQ8OW6 extension....
1
vote
3
answers
1k
views
How to power a 24V 2.5A DC motor with a switching power supply?
I need to power a windshield wiper motor at 24V. Switching mode power supply shuts off.
The motor, rated 50 W, runs at 12V (50 RPM) or 24V (110 RPM). It's exactly the same one this guy has in this ...
1
vote
1
answer
66
views
Ebike 24v relay board - switch?
Hi I’m building an Ebike and using a reclaimed relay board from an old electric moped. My question is the relay board has 3 small wires presumably for the switch, but this confuses me as I only need 2 ...
7
votes
2
answers
2k
views
24 V transistor switch acting strangely
I am working on a project to switch a spring-applied brake (datasheet, page 84, MCNB 2GR) using a Teensy 3.5.
I only have limited electronics knowledge and am struggling with weird behaviour from the ...
2
votes
1
answer
241
views
Toggle Flip-Flop for Voltage Higher than Logic Levels
I need a T flip-flop for 24V. The purpose is to take a 24V 50% duty cycle 0.5Hz pulse wave and halve its frequency to 0.25Hz, so that the output wave toggles between 0 and 24V at the input's rising ...
1
vote
2
answers
60
views
Normally Closed, 24V DC, 1/4 NPT Female, 1.4 Cv solenoid valve power supply
I have a solenoid valve of Normally Closed, 24V DC, 1/4 NPT Female, 1.4 Cv, 500mA max current drawn.
Can somebody verify the power supply requirement.
would this be an ideal power supply unit for the ...
0
votes
1
answer
58
views
Connecting 2 identical led RGBW controllers with 12V led strips same length into a 24V Power supply [closed]
Ok, some bad decisions took place and now i am stuck with no money and:
24V 8.33A power supply with 2 channels.
Magic Home 5V-12V-24V RGBW wifi Controller 192W max (got them from here)
15m of 12V ...
0
votes
1
answer
530
views
Read 24 Vac signal with a Raspberry Pi
I want to read a 24 Vac signal coming from my old automatic gate with my Raspberry Pi. The signal tells me if the gate is OPEN->24 Vac or CLOSED->0 Vac. Raspberry Pi input are 3.3 Vdc tollerant. ...
2
votes
1
answer
1k
views
How can I use 24V DC input for Arduino digital pins?
In this circuit, switches should be connected to 24V DC and arduino pins should check whether switches are on or off to control led behaviour. I don't know how to use 24VDC for this situation. I would ...
2
votes
2
answers
2k
views
Alternator output rating
Overview:
I am currently working on a project that requires a 24v alternator, which is powered by a mower engine.
This engine in particular runs around 3,000 RPM, and does not exceed 3,200 RPM (based ...
1
vote
1
answer
174
views
Diode OR or transistor OR circuit?
I need a circuit that converts a 3.3V signal into a 24V signal. But I also need to be able to activate the 24V signal using a PCB switch. I can do it in two ways, using a diode OR or using a ...
1
vote
0
answers
38
views
Send a 60Hz trig signal over a 9m cable
I want to send a trig signal over a 9m cable, the signal is around 60Hz (each 15ms it sends a 1ms pulse). In order to avoid electrical interference I convert the 3.3V original signal with the ...
0
votes
1
answer
424
views
Interface 24V signal from one device to 3.3V signal on another device
I have a device A that sends a signal through an optocoupler, this signal travels through a 7m cable and is used by another device B that has a SN74LVC1G17SingleSchmitt-TriggerBuffer powered by 3.3V, ...
0
votes
0
answers
79
views
How to power bulbs expecting 24V AC from a car's "cigarrete" socket?
I'm turning the trunk of my car into a UV-sanitizer chamber -- so that, by the time I return from the supermarket, the bags and the packages handled by strangers there are sterile.
To this end I ...
-1
votes
3
answers
986
views
How to add an emergency stop switch in a circuit?
I am into a project, where I have made a a bot, which has a 6 degree of freedom robotic arm with four wheels. I need to add a kill switch that is connected to a relay, which stops all the 10 motors. I ...
1
vote
2
answers
943
views
parallel connecting 24v 1500mah NIMH battery packs and how to charge
After several of searches on the internet for information about charging NIMH batteriers, i feel the need for some clarification. I've gotten my hands on a bunch of battery packs. Each battery pack is ...
0
votes
3
answers
964
views
Can I use 1 mm² wire for 24 VDC / 15 A load?
I am currently using 1 mm2 copper wire for a my application of driving a 360 watt motor, haven't caused any problems for me yet. The total wire length is around 3 meters. a voltage drop of 0.5 V ~ 1 V ...
0
votes
2
answers
91
views
Which device will allow me to simply capture 24v?
I'm new to electronics, struggling to work out whether this is simple and I'm missing something or whether it's a lot more complicated that what I anticipated.
I have something (some device) that is ...