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Questions tagged [24v]

Questions relating systems powered by a 24 volt supply.

0
votes
2answers
37 views

24V signal switching optccoupler

We have a robot, and it has 32 digital output, fed into a homemade PCB. On the PCB we have optocouplers, which have a forward voltage around 1.2-1.3V. So I need to drop the voltage a lot. That's why ...
0
votes
1answer
54 views

LED driver putting out more voltage than rated?

The Background I bought a 200W magnetic LED driver with hopes of replacing the 40W Philips-supplied driver that came with my set of Hue Lily outdoor lights. Each fixture requires 8W at 24v. This new ...
-1
votes
2answers
99 views

Why do we still use high voltage at home (on sockets) in the 21st century? [duplicate]

Just wondering, most of all equipment at home have components/circuitry inside to transform high voltage (AC) into lower voltage (mostly DC), also all modern LED lambs. Modern products become more and ...
0
votes
0answers
37 views

Interfacing with a Nest Hello 'chime connector' module

I currently own a Nest doorbell that uses a "chime connector" between the doorbell wires and doorbell chime as shown below. I have tried to create a digital doorbell chime that will wirelessly ...
0
votes
0answers
43 views

Bonding DC Minus to Ground with Resistor for Remote Power?

Layout: I have a system that has 3 serial networks that run a variable length with one central processor talking to multiple endpoints via Modbus RTU, Canbus, and another rs485 that talks a protocol ...
0
votes
3answers
85 views

Speed limiter - 24v Motors

I'm looking for a way to limit the speed of some wheelchair motors in order to gain better control when using them in my RC device. Currently the motors are very sharp and don't ramp up to speed, ...
0
votes
4answers
93 views

What can happen if 24vdc is applied to an Ethernet port?

We have a device with two RJ45 ports. One of these ports is for receiving 24vdc on pins 7(-) and 8(+) to power the device. The other RJ45 port is an Ethernet connection. The ports are of course ...
0
votes
1answer
32 views

Mini 360 DC Buck Converter [closed]

I have bought several DC Buck converters for my home-made 3D printer. I'm running a 24V PSU, but my fans are Noctua (12V) ones. So i want to convert 24V down to 12V. And the Voltage output works fine. ...
0
votes
1answer
60 views

Should I use constant current or constant voltage drivers for driving my PWM 24V DC Fans?

Hi everyone thanks for stopping by to lend your thoughts. I need to run 2 circuits separately and control via Arduino uno PWM. One circuit is 2x Noctua NF-A14 industrialPPC-24V-3000 Q100 IP67 with ...
0
votes
1answer
120 views

dc motor, hall sensor 10-20VDC to arduino

I have a linear actuator with a brushed DC motor with 2 hall sensors. I intent to use the sensors to monitor the position of the actuator. The specifications of the hall sensors are as follows: Hall ...
14
votes
7answers
4k views

How make a dual +-12V supply from a 24V SMPS

I'm trying to power a home-made load cell transmitter using a 24V single SMPS. I need to make +12, 0 and -12 Volts that are capable of 50mA. I wish to power multiple channels of opamps and bridges. I ...
3
votes
1answer
135 views

Powering 9216 leds @5V, @24V with converters

I am struggling with a power supply question. I would like to power up and control 9216 LEDs -- strips of 144 LEDs/meter (WWA SK6812 - just like the RGB kind). These are powered at 5V and draw 43.2 ...
0
votes
1answer
68 views

How to determin the load requirement for 24V DC power supply

I'm working in automotive industry, I got a project to add extra hardware to particular line. hardware actually requires 24v 70w. Now, we have a Power supply unit "power one he-24V-7.2a" in the ...
0
votes
2answers
325 views

Interpolate variable 0-24v to power a 12v fan and control it's speed

I want to replace the two noisy 24v brushless fans on my printer with high performance silent 12v fans, more specifically Noctua A4x10 FLX The 3D printer hot-end fan is on continuously with 24 volts, ...
1
vote
3answers
328 views

PWM Dimming 24v with 3.3v input

I am trying to dim a 24v led-strip with a 3.3v PWM-signal coming out of a ESP32. Currently I have this circuit: But there is one problem. It works for dimming till ~40%. But when I turn the PWM off, ...
0
votes
1answer
351 views

Wide voltage range input regulation (24V - 3.3V)

TL; DR: I need a circuit capable of handling input voltages from 24V to 3.3V (with a 10mA/5mA maximum current) and delivering 3.3V to the microcontroller (ESP32) input. Recently, I've been working ...
-1
votes
1answer
189 views

Can't get relay to work with 24vac transformer and ducting

Would like to preface this that I don't know a lot about electrical stuff but I try my best. I am trying to control a HVAC duct damper with a raspberry pi. I have the power-open-power-close duct ...
0
votes
1answer
73 views

4 input counter with display

I have 4 switching sensors for all around detection, they output either 24V or 0V. I want a counter that will add 1 everytime one of the sensors detects something (sometimes 3 of them will detect ...
1
vote
1answer
160 views

24v to 12v truck cigarette socket wiring

Hi guys i have a aerpro 24v to 12v reducer, but it has a positive a negative and an earth wire i need to wire it up so i can plug it in to a 24v truck socket and then have the 12v going to a cigarette ...
0
votes
1answer
837 views

Arduino 24VDC motor speed control

I have designed a circuit with some resources from this website and I attached it here. I have given circuit connection in a breadboard and successfully run and control the speed of the motor. After a ...
7
votes
1answer
8k views

How to convert a digital signal from 24V to 5V

I have an industrial automaton that gives me a digital signal (24V or 0V) on its outputs and I want this signal to control an integrated circuit, but the integrated circuit only takes a TTL signal in ...
1
vote
0answers
57 views

Converting a 24v bldc to 12v

So I have been designing a brushless motor and the circuit that drives it is based off of this Texas Instruments one here. The only problem is that this circuit runs off a minimum of 24v. I would like ...
1
vote
1answer
283 views

What will be the current of a 24V ATX power supply?

I have an ATX power supply with a +12V 8A line and a -12V 0.8A line. I assume if I used the -12V as ground to provide 24V, then the maximum current provided by the 24V line would be 0.8A?
0
votes
0answers
31 views

What do i have to change to use it with 24V 10A motor [duplicate]

I have built this scheme But this works only with 12V because of Vgs=20V. My question is: what do i need to change in this scheme to make suitable for 24V?
0
votes
2answers
39 views

Asymmerical measuring limits

I would like to know your perspective on the following: When measuring 24VDC both the lower test limit (LTL) and the upper test limit (UTL) are defined by either product, safety or 'common' ...
2
votes
2answers
397 views

Voltage drop @24V2A using a MOSFET with Arduino

I'm not really good with electronics but i'm really trying to learn as much as i can, so please have mercy on my question :) Hardware So, i have an Arduino Uno, a 24V 150W power supply, a 24V 48W LED ...
2
votes
1answer
970 views

Can I Run An Appliance From a 24v Battery?

First, a little backstory. My wife is planning to operate a booth at some craft fairs and we require power for a piece of equipment (Silhouette Cameo, a computer controlled vinyl cutting machine). We'...
1
vote
2answers
1k views

12V pump on 24V supply

I've got a small 12VDC pump that I used on an old project. I now want to use the pump on a different project and make use of a 24VDC transformer I have (because the project also makes use of a 24VDC ...
-4
votes
1answer
1k views

24Vdc signal for 800meters distance [closed]

what is the best/simple way to get a 24Vdc signal (with minimal loss) across 800 meters, without having to use an absurdly thick cable?? I am talking about a solenoid valve 24Vdc and a proximity ...
0
votes
5answers
582 views

24V to optocopler (voltage drop of 22.8V)

I have to detect a signal of 24V. The lenght of the signal is 1 second. So I use an optocopler. The led inside the optocopler must receive 1.2V. First I use a resistor (4k7) but the resistor heat ...
0
votes
2answers
79 views

Help needed solve fire house problem 24v to 12v 100 milli amp [duplicate]

We are trying to make an antique bell work I'm told it needs 12v .1 / amp or 100milli amp Our current power system is 24 volt 20 amp can you please help us step this down . We were going to use a ...
3
votes
4answers
876 views

How to generate a -24V signal

I have to interface a specific motor, it has a weird driving board, I was in contact with the technical team from the manufacturer, and they told me that I have to send a -24V on a pin to allow it to ...
0
votes
1answer
247 views

5a 24v mosfet h bridge to power solenoid

I created a mosfet h bridge based on the design from bristolwatch. http://www.bristolwatch.com/ele/moshbridge/mosh7.png I'm using it to power a solenoid (that needs +24v or -24v to open/close a ...
-2
votes
1answer
206 views

relay coil issue

i've been googling my way through a problem and now i am stuck and haven't found an answer. So here is what I am trying to do. i have 24vdc connected to the positive side of the coil on a relay and ...
-1
votes
1answer
912 views

0-5V PWM to analog 0-24VDC voltage with MOSFET

Im having trouble understanding how or if it even is possible to regulate a voltage with a MOSFET. I want to regulate an output voltage of 0-24VDC 0.5A(continuosly) with the duty cycle of a 0-5V 1kHz ...
1
vote
1answer
387 views

Transient Voltage Protection of an automotive circuit

Im an electronics engineer student, and im doing a project where im designing a circuit which will be used in automotive applications. More specific it contains a PIC controller which has 16 digital/...
2
votes
2answers
2k views

35v reading on 24v transformer

im troubleshooting a 24v ac transformer hooked to two doorbell circuits and on one of them I am getting a 35v reading. What could be causing this? I am reading the voltage using a standard (cheapo) ...
2
votes
3answers
301 views

Industrializing a PIC micro-controller

I want to replace some timers with a PIC16F887 micro-controller. The problem is that the input voltages to the I/Os is going to be 24V which is too much. For the output part I was thinking about using ...
0
votes
2answers
2k views

Running a 24V motor on a 12V boat system

I'm trying to design a jigging machine for a fishing boat, using a RaspPi as the controller. (A jigging machine jerks a 1kg lure up and down near the sea bed, and pulls in a fish when it's hooked.) ...
2
votes
2answers
958 views

Why is there a resistor in this reverse-polarity-protection circuit?

I was looking at the recommended reference implementation for a particular integrated circuit (the TI SN65HVS880, data sheet here). It runs off of a 24 volt power supply. The circuit diagram looks ...
0
votes
3answers
640 views

Switch to stay ON until power removed (24V)

In my bathroom, I would like to install some 24v LED tape, some in a warm-white and some in a cool-white, that I can switch between at will. IE: I will turn on the circuit from the wall-mounted dimmer ...
1
vote
1answer
71 views

Remote switching in rural village

How might we control a 2" valve >2000ft away in a remote village. We're thinking that we power the system with a 12 v or 24 v solar powered/ battery backup. The spot in the village with line of ...
-2
votes
3answers
357 views

How to determine the maximum power required by given devices? [closed]

I need to power 4 devices with these power input specs: ...
1
vote
2answers
324 views

How can I detect which DC power source to send to an underwater camera housing?

I have a small problem and hoping someone can help: I am trying to design and build a reasonably universal underwater housing for some different cameras. there is a breakout box on the surface and ...
0
votes
1answer
123 views

Connecting two PSU's in series

Good day, I found this question asked before (not exactly this) but the answers were wrong (at least at some level). So i have two 300W PSU's (different manufacturer so different schematics too). I ...
0
votes
1answer
1k views

Materials required to convert NiMH rechargeable 24V/6Ah circuit (20 C-cell) to Li-Ion rechargeable circuit

Below is a picture of a battery shell for a NiMH circuit for a power assist wheelchair battery. I'm taking a guess that each of the 20 batteries is 1.2V because the entire circuit is 24V. These are ...
1
vote
1answer
963 views

24V proximitiy switch, NPN transistor, Arduino interrupt input

I build circuit which take proximitiy sensor as input to circuit (24V). With this 24V we switch on and off NPN transistor. On the side is Arduino with interrupt enable when pin is LOW. So I need ...
1
vote
1answer
295 views

Arduino Ethernet shield

I have some problem with Arduino and Ethernet shield. I have a small project with Arduino. Sensors send data to webserver. Everything works fine when arduino getting power from PC usb but when i give ...
0
votes
2answers
138 views

24 VAC source unable to drive servo motor

Here's my power supply (schematic except without the transformer since my source is already at 24 V AC and using a 100 uF electrolytic as my smoothing capacitor): 24 VAC rectifier -> 100 uF smoothing ...
2
votes
2answers
491 views

24V power supply for MCU+USB

I'm designing a home automation controller in college. The system is on 24V (relays and sensors). I'm using TI Cortex M3 MCU and i want to control it over USB. This picture of the system is currently ...