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Questions tagged [24v]

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problem with the main board I am experiencing a problem with the main board [closed]

I am experiencing a problem with the main board Could you please help me with this, or recommend someone who has expertise in main board repairs?
Abdalrhman Aburumman's user avatar
0 votes
1 answer
53 views

Can I mix 5v power sources? how about 24v power sources?

Hello and thank you in advance for pointing me in the right direction. I finally started designing my own PCBs. If I set up a PCB with a 110 to 5v power source (HLK-PM01), could I then add another 5v ...
Cancun Manny's user avatar
1 vote
1 answer
81 views

Arduino can not drive a BJT connected to a relay

I'm trying to make a simple 24V relay driven by an Arduino Leonardo as per the following picture: The Arduino code simply toggles the output every 2 seconds. When I measured the pin voltage alone, ...
hrsk2002's user avatar
0 votes
1 answer
39 views

making a long lasting battery pack for 24V/0.5A

I brought a stereo equipment from Japan that uses a wall-wart set at 24V/0.5A. I would like to replace the PS with a long-lasting battery pack, but all I can find are 12V/5A batteries, or 24V/5A. I do ...
Reimar Bruening's user avatar
2 votes
1 answer
99 views

What size should I select for the resistor? I have led and SSR and 24VDC source [closed]

Could you please clarify this circuit with me? I have selected 90 ohms. Please let me know if I need to do something differently here. R=(24-30.3)/20mA= 1035ohm and I select 1Kohm I appreciate any ...
AAS's user avatar
  • 21
3 votes
2 answers
257 views

TVS2201 clamping diode failed at 27 V

In the development of ESD protection and reverse polarity, I encountered a problem. The circuit is supposed to prevent reverse polarity (it does, we tested it). During testing, I applied a voltage of ...
douce's user avatar
  • 71
-1 votes
2 answers
102 views

Can a single buck converter be used for converting both 12V and 24V input to a constant 12V output DC to be fed into a 12V DC motor?

My target is to design a low-cost PCB to run a 12V DC motor. I do need to have 2 input sources, a 12VDC and a 24VDC. What is the best way to achieve this using a single board? Can I use a single buck ...
Adithi's user avatar
  • 3
0 votes
2 answers
124 views

Why doesn't this DC motor run?

I have a BG 2212 DC motor. It has 6 pin connector. I tried to connect gnd and the + connector to a 20V/24V power supply but the motor did not spin at all.
Camaro46's user avatar
0 votes
0 answers
104 views

Will Undervoltage Damage A Brushless Fan?

I have an off-grid solar panel set up ready and it works really well. My solar PWM charge controller of the back side aluminum heat sink is too hot to touch when its during sunlight. I was thinking ...
Kokachi's user avatar
  • 690
2 votes
1 answer
92 views

Input of 20~23v, need output of 24v [closed]

I have a supply that outputs either 20v or 23v, I need to step that up so it is always a fixed 24v no matter what. How can I make sure it is always a fixed 24v? Edit: This is for a coin hopper. It ...
Pyper's user avatar
  • 21
0 votes
2 answers
148 views

How to reduce 24V to 0V-5V variable through a pot with an output current of 3amp? [closed]

I want to build a 5v variable PSU. I found one on ebay but the output current is not good for my application, 10mA.
EMed1839's user avatar
0 votes
1 answer
83 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 ...
FullMetalJack's user avatar
0 votes
1 answer
116 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 ...
Christopher Marshalek's user avatar
0 votes
0 answers
194 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 ...
Learning4Fun's user avatar
0 votes
1 answer
125 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 ...
Chris Tunstall's user avatar
0 votes
1 answer
63 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 ...
John Stoddard's user avatar
1 vote
2 answers
274 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 ...
Jacques Le Roux's user avatar
0 votes
0 answers
53 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 ...
Jordan Davco's user avatar
2 votes
2 answers
282 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 ...
trident_'s user avatar
1 vote
0 answers
74 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 ...
RektByMemes's user avatar
1 vote
2 answers
80 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 ...
Eliza Smith's user avatar
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 ...
empewoow's user avatar
0 votes
1 answer
463 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 ...
codecarbo's user avatar
0 votes
1 answer
179 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 ...
KimJiHoon's user avatar
1 vote
0 answers
258 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?
PRAMIL WAKCHAURE's user avatar
0 votes
1 answer
98 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 ...
user avatar
1 vote
1 answer
129 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 ...
andromax's user avatar
1 vote
2 answers
504 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. ...
user2668812's user avatar
1 vote
2 answers
694 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 ...
Pedro NF's user avatar
  • 265
0 votes
0 answers
515 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 ...
Justin Maxwell's user avatar
0 votes
1 answer
881 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 ...
sentago's user avatar
  • 11
0 votes
2 answers
67 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 ...
Andrew Smith's user avatar
0 votes
2 answers
243 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 ...
Marcell Juhász's user avatar
0 votes
1 answer
1k 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 ...
ABeardedItalian's user avatar
-1 votes
1 answer
89 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 ...
Frank Van der Horst's user avatar
0 votes
1 answer
71 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, ...
Nidhi's user avatar
  • 87
0 votes
0 answers
772 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 ...
E.Murphy's user avatar
0 votes
1 answer
662 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 ...
Marcell Juhász's user avatar
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 ...
Matthys Du Toit's user avatar
0 votes
1 answer
185 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. ...
Eric The Red's user avatar
0 votes
2 answers
637 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. ...
Oz Sco's user avatar
  • 3
0 votes
0 answers
183 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 ...
lolbardsnin's user avatar
0 votes
3 answers
1k 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 ...
BikerDude's user avatar
  • 173
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....
Garet Jax's user avatar
  • 121
1 vote
3 answers
2k 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 ...
spacefolder's user avatar
1 vote
1 answer
69 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 ...
Steve's user avatar
  • 11
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 ...
Custos's user avatar
  • 105
5 votes
5 answers
356 views

Toggle flip-flop for voltage higher than logic levels

I need a T flip-flop for 24 V. The purpose is to take a 24 V, 50% duty cycle, 0.5 Hz pulse wave and halve its frequency to 0.25 Hz, so that the output wave toggles between 0 and 24 V at the input's ...
IntiEngineer's user avatar
1 vote
2 answers
66 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 ...
Nandakumar Menon's user avatar
0 votes
1 answer
82 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 ...
Fero's user avatar
  • 3