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Questions tagged [solenoid]

An electromagnet combined with an actuator to convert electrical energy into linear physical motion.

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1answer
25 views

custom solenoid trigger circuit

I have a custom made solenoid that is required to work at 60V to actuate with enough force. I have tried two circuits shown in the figure below but both don't work. In the first circuit, the voltage ...
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0answers
86 views

Wiring DIN connector with 3 wire DC solenoid valve

im buying [smc VQZ 212 5YZ1 C6] 3 port solenoid valve with 2 possible position(let say A and B). This solenoid work with 24VDC and have 3 pin/ wire. There is No 1, No 2 and GND pin. I will never ...
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2answers
53 views

24 VAC sprinkler valve using DC power

I am creating a circuit that includes a 24vac sprinkler solenoid. I need it to be portable so I'm planning on using DC current rather than AC. What is the best way to do this? If I just use straight ...
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16 views

Driving a 24V solenoid with a comparator under certain condition

I'm getting from a Hall Effect magnetic sensor a variable voltage between 0.8 and 3V. When the voltage is less than 0.9V, I want to activate a solenoid valve. If the voltage goes more than 1V, the ...
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1answer
55 views

Raspberry Pi Zero - PWM & Python Help

Disclaimer: I am very new to electrical engineering, but I'm determined to figure this project out. I'm currently working on electronic solenoid lock. Here's a image of what I have so far. I have a ...
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1answer
48 views

Operating a 24VAC solenoid with a Triac. Protecting with TVS DIODE, RC Snubber or both?

As part of a project I am controlling 24VAC solenoid sprinkler valves like this https://rayshobby.net/wordpress/understanding-24vac-sprinkler-valves/ using a triac (BT1308W) http://www.mouser.com/ds/2/...
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2answers
74 views

Why there is a voltage drop while connect multiple 12 V or 24 V solenoid valve with a 24 V DC adapter

I am doing a water plant project. I need to control multiple solenoid valves with my micro controller circuit using relays. When I connect more than 4 solenoid valves (12 V) with a 15 V adapter it ...
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2answers
59 views

Boosting voltage to power a solenoid (pulsing intermittantly)

I would like feedback on the following circuit design please. I am powering a solenoid using a 3S LiPo battery but want to increase the voltage to 35v. I am using an XL6009 module to boost the ...
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1answer
27 views

triggering a solenoid valve from batteries charged by hydroelectric system

I'm providing a slow-closing solenoid valve for a hydroelectric system in a village in the Philippines. I need to have the normally closed valve activated to open when the batteries are drained to a ...
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1answer
48 views

Can someone help me design a circuit that will open when power is applied and close after power is removed?

I am using an air conditioner thermostat transformer which provides power to my circuit. When the thermostat powers up, the door opens. I want the door to remain open until the thermostat shuts off, ...
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31 views

Turns per unit length and inner core area of solenoid with multiple layers of windings

I have wound a solenoid with 675 turns of 16 gauge wire. The windings are in layers, one on top of the other, for a total of about 17 layers of about 40 turns each. The end to end length of the ...
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1answer
37 views

Why does a Solenoid driven with intermittent duty cylce produce higher force than with continuous drive?

I'm selecting some solenoids with my MechE and I noticed something that I didn't have an intuitive explanation for. We were looking at this solenoid and noticed that at the bottom the forces ...
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1answer
46 views

Safe solenoid driver: can I use a slow blow fuse?

I'm building a device that uses a microcontroller to control 15 solenoids via a preexisting multichannel DC solid state relay board. When all is working as intended, at most one solenoid will be ...
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1answer
51 views

Proper Flyback Current Protection Circuit for Variable Voltage Solenoid Driver

I am using a darlington buffered op-amp to drive a solenoid motor at variable voltages (for variable speeds of actuation). Here is my circuit as it is now: I am wondering which of the two flyback ...
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1answer
78 views

Operating a 12V electric lock with arduino

I have a similar electric lock-style solenoid like this one. If we trust the manufacturer it draws between 1.2A and 2A at 12V .I'm currently using a N-Channel MOSFET 60V 30A - FQP30N06L it works just ...
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95 views

Electromagnet: multiple thin wire windings instead of one of thick?

I'm designing a solenoid-based actuator, after doing calculations using this website, i found the proper wire thickness needed to get right force at a given voltage. The problem is, here, where i live,...
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4answers
102 views

NodeMCU control 12v solenoid

I am trying to control a 12v solenoid from a NodeMCU. I bought the wrong MOSFET, I've got an IRF520 (the website I bought it from said the gate threshold voltage was 3.3v, so I thought it would work, ...
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4answers
104 views

Flyback Diodes For Inductive Loads With Long Wire Runs

I have a project that uses several high power DC solenoids (50 VDC) that will have ~10 feet of wire between them and the driver board. This is for pinball machines. These solenoids typically come with ...
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2answers
294 views

Increase the pulling force of a solenoid with a permanent magnet [duplicate]

I have a number of solenoids I would like to use in a project. The problem is that they're not quite powerful enough so I've been trying to come up with ways to increase the their pulling force ...
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1answer
67 views

Replacing the core of a solenoid to increase the pulling force

I have a number of solenoids I would like to use in a project. The problem is that they're not quite powerful enough so I've been trying to come up with ways to increase the their pulling force ...
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3answers
89 views

Why Does Flyback Current Destroy Darlington Buffered Op-Amp?

I am working on a project where I'd like to deliver variable DC control voltages to a continuous solenoid motor in order to achieve different velocities of actuation. To buffer my DC control voltage ...
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1answer
244 views

Driving a 24VAC solenoid with arduino using a octocopuler and a triac

Following a previous question I have redesigned my schematic: I'm trying to energize a solenoid used to open and close a 24VAC sprinkler valve I have the following questions : 1) The GPIO leg can ...
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1answer
139 views

Controlling a 24VAC solenoid with arduino

I'm trying to come up with a design for controlling a 24VAC water valve with an arduino. My current design : I want to use a BT1308W TRIAC controlled by an arduino pin to activate the vale, I'm also ...
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2answers
89 views

how do I make a solenoid operate after a random number of switch presses

New to the forum because I am stumped. Im building what I am calling the "water table" for my kids. It has a series of spigots, and channels that funnel into a kiddie pool. Then I got creative and ...
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5answers
949 views

Automated test for pushing a pcb mounted mini push button

We have a test that checks whether or a push button works or not, and as of now the test is done manually by hand. My question is how to do this automatically? We have considered using a solenoid to ...
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45 views

Solenoid control with current limiter - is it correct?

last year, I designed a solenoid control board which is still working very well. The board was based on ATmega328p and used an optoisolator 6N136 to isolate the high power from the low power and I ...
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0answers
137 views

0.5 tesla solenoid

Alright, I am supposed to make a solenoid (water cooled) having 0.5 T field at the center. The solenoid should be ideal so we are supposed to make the length of solenoid quite large as compared to ...
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2answers
46 views

Alimented coil close to a passive coil

If I build a coil A, of 10cm height with iron core and a 4cm diameter, and alimented it with a DC 15v,6amp source, it will produce a magnetic field. Let’s say A is set vertically. Will building ...
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1answer
155 views

Not enough power going through IRLZ44, activated by Arduino

I've a 9v battery and I'm trying to get 9v through my IRLZ44, to power an solenoid. It's a seperate system from my arduino who's sending a 5v signal to the IRLZ44 in order to activate it. For some ...
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1answer
180 views

How do I use a hit and hold circuit with a solenoid?

Solenoids burn power when turned on and get hot, what is a way I can reduce the power while keeping the coil actuated?
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2answers
72 views

Power supply for a solenoid to open a secret compartment

I'm an avid DIYer, I don't know anything about circuits, meters, mathmatical equations etc. I have created a secret storage compartment so the door has no visible hinges, handles or locks, It's made ...
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28 views

Firing 8 Disposable Cameras Shutters via Solenoids

I've found an 8-channel SRD-05VDC-SL-C relay. The solenoids I am looking at are: Solenoid repelling 0.18 N/mm 2 N/mm 12 Vdc 1.1 W https://www.conrad.com/ce/en/product/502285/Solenoid-repelling-018-...
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1answer
89 views

Electromagnet flux density calculation knowing specs of coil, core and applied voltage?

Seems to be almost a textbook task from a freshmen class. But I am truly puzzled. Electromagnet has a coil of tightly wound 100 turns of copper wire around a cylinder core with relative permeability ...
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1answer
41 views

Solenoid valve part

Noob question, what is the pink one in the solenoid? Can it be bought separately? thanks
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3answers
241 views

Solenoid's field intensity calculation dependency on width/diameter of coil?

Textbook formula for field intensity in solenoid coil is H = (N * I) / l H magnetic field intensity in ampere-turns NI ampere-turns l is length between the ...
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1answer
89 views

Tape Deck solenoids

I found an old Tape Deck recorder that I tore apart to scavenge for interesting parts. Two different kinds of solenoids left me wondering: From an old service manual (not related to the tape deck ...
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1answer
34 views

How to find which voltage a solenoid would operate in

What is solenoid used in Orbit 91213 water timer? I have one which lasted quite some time, but lately some issue in its circuit made the display useless, but I think solenoid would be intact. What ...
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47 views

Detection of switched on solenoid - charging station CHADEMO

I need to detect status of switched on solenoid (two switches, I attach the scheme) by RASPBERRY PI (GPIO) and I dont want to use comparator (amplifier). Any suggestions how to do it?
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1answer
91 views

Sizing zener and resistor for solenoid flyback

I am trying to drive a vibratory pump from a 220 V boost converter (the common 150 W DC/AC 12 V to 220 V boost converter found on ebay) and a MOSFET switched by an Arduino/optoisolator at 50 Hz. The ...
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2answers
382 views

relay contact fails (suspect sparking)

I have a relay which is rated for 30 VDC @ 10 A or 28 VDC @ 10 A (which appears on this relay module) and I am running 12 V @ 6 A through the relay and this solenoid. After a short amount of time (...
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1answer
384 views

Short Circuit Detection in wire

I am looking for a way to detect a short in a piece of wire. I want for an LED to light up when the wire is shorted. i started off by using an op-amp comparator but this didnt work. the specs of the ...
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1answer
360 views

Solenoid force to stroke equation

What does the variable "k" mean in the solenoid equation in the picture attached? Many thanks for the help.
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134 views

How to build a 15,000 Gauss hand-held electromagnet

I'm wondering if it's possible to build a small hand-held electromagnet shaped like a solenoid that is possible of producing a field of 15,000 Gauss. I'm familiar with the formula for the strength ...
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1answer
648 views

Power Supply for Solenoid Circuit

I'm trying to build a circuit to let a Raspberry Pi control 12 linear solenoids. The solenoids are rated for 12 V and 400 mA, so they should have a resistance of 30 ohms. However, on the force-stroke ...
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1answer
69 views

Power Supply for two 50V/12.5A Solenoids

I'm in the planning stages of building a custom pinball table and one of the sticking points is powering the flipper coils. They're 50V DC coils with a resistance of only 4 ohms during the stroke. ...
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1answer
42 views

How to power 12v DC pneumatic solenoid?

i am having a 12v dc pneumatic solenoid. It's mentioned with 200mA. Can i use 12 V 1.3 AH battery to power it up?
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3answers
47 views

How to calculate net force from a Lorentz Force Density in Magnets

Consider a pair of solenoid magnets as shown in the figure. Based on the magnetic field (B) at each point and corresponding Current Density, (J), I can calculate the Lorentz Force density at each ...
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0answers
21 views

Balanced Solenoid

Most linear solenoids have stroke-force curves where the force decays rapidly as stroke increases. To my understanding, this is because the magnet armature moves beyond the casing and out of the coil'...
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2answers
62 views

Solenoid driver heating issue [closed]

This is regarding an automotive transmission control module(TCM) solenoid driver. The schematic diagram of the driver is very similar to the below image. Only difference is the TCM has the low side ...
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1answer
42 views

Understanding battery capacity with solenoid application

I am working on early stage of product design and was hoping I could get some guidance/ help. My product will use between 12 and 15 individual, small (less than 1" diameter) rotational, self-...