Questions tagged [solenoid]

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

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voltage determining solenoid force?

I made a silly beginner's mistake: I purchased some surplus rotary solenoids from electronic goldmine without paying close attention to their power requirements ("Oh, they are so cheap!"), so I ...
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MOSFET or bipolar to drive a solenoid valve?

I have to drive a 12V solenoid valve. In the datasheet it's written: Power: 8 W. So the current drawn by the solenoid is 0.666 A. Usually, to drive small relay (about 10 or 20 mA) I use a bipolar ...
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How to determine the force of a solenoid based on inductance

I'm looking to potentially build my own small solenoids, I thought perhaps that I could take an Air core inductor, a spring, piece of plastic, and conductive core and build my own. Is there a way to ...
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Solenoid Power Source

So Im trying to make a solenoid a switch, but I have heard two different ways to power it: AC or DC power source. I learned in class that an AC power source would work because a solenoid is basically ...
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1answer
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Looking for linear solenoid actuators less than 2 cm in length [closed]

Do such parts exist? Are they cheap? I want to take a sheet of plastic and cover both sides with solenoids, some aligned in the X direction and some aligned in the Y direction. With at least a ...
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Help me interpret solenoid shopping info

I'm trying to get a cheap pull-type solenoid that can operate for at least ten seconds at a stretch to serve as an electronically-controlled ward in a lock (for a wooden box) I'm building. I'm a ...
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2answers
575 views

Schematic review

I'm designing a control circuit to operate a watering system. I've got a main inlet valve, four outlet valves, and soil moisture sensors in the mix, driven from a 25.4 V CT transformer. I was ...
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2answers
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Driving Solenoids from Arduino

I was wondering what the best way to run a solenoid would be from an Arduino board. I was thinking about using a MOSFET that runs into a relay to turn on the solenoid but am not sure how to go about ...
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Why aren't solenoid/electromagnet windings insulated?

This has been bugging me for a long time. Take this video for example. I have always thought that electricity will take the shortest path. When the electromagnet's windings are uninsulated, it seems ...
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1answer
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How to actuate a solenoid for maximum power without damaging it?

I want to activate the solenoid. See specs for 34 AWG solenoid here: I am powering the solenoid with 12V. Which of the following two ways would give the most power? Powering the solenoid for 100ms ...
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My MOSFET operated solenoid circuit destroys my Arduino inputs

I made a series of PCBs to power some solenoid valves that use an external power supply. I switch them with BS170 MOSFETs using an Arduino as gate signal. I based it a solution by Jason S. This is an ...
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3answers
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Driving a proportional solenoid from PWM via NPN/MOSFET

I'm very new to electronics and just want to get some feedback on a circuit + hopefully some explanation about a couple of points: I have a digital pulse (PWM from controller ranging from ~0-300Hz) ...
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1answer
260 views

Amplifying PWM to solenoid

I am driving a solenoid with a DRV103 (a driver for inductive loads by TI), but I need to allow more current to flow to the solenoid than the DRV103 can output. Initially, I tried a simple common ...
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What would a professional use to switch sprinkler solenoids?

As evidenced by several previous questions of mine, I'm working a project to design a sprinkler controller. This involves driving one of 16 solenoids (well, probably only one at a time...) based on a ...
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Do solenoids exhibit back EMF like motors?

I just purchased some pinball machine solenoids and was experimenting with them; DC resistance is about 30 ohm, they actuate at about 30 volts, and they hold at about 6. I tried controlling them with ...
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Long solenoid (50cm stroke)

I need to move a rod with a 50cm stroke. Almost no force is needed(the rod is just for display purposes). Speed is also not essential. I was thinking of creating a very long DC solenoid but I am ...
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Solenoid Alternative?

I wanted to use solenoids in previous projects and have been let down by the fact that I can't find them here in Egypt. Plus they are a bit expensive. My question is: is there an alternative that it ...
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How to make a solenoid armature travel at a faster rate of speed?

My project requires a solenoid with a stroke of 15mm and the travel speed must be 15mm in 2ms. What can be done to get higher speed of travel in the armature?
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4answers
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Solenoid Electrical Characteristics

I'm looking at this line of solenoids, but I'm not sure how to figure out the electrical characteristics. If the solenoid is rated at 12VDC, and 3W, does that mean I can strap it across a 12V supply, ...
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2answers
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What IC is good for driving an array of smaller solenoids?

I have a 7 segment display where all segments are driven with a solenoid. In order to switch each segment I have to pulse a short current on the solenoid. To change the segment I have to pulse it in ...
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3answers
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How does the size of a reservoir capacitor affect battery life?

I have a circuit, powered by a 9V alkaline, where a solenoid is actuated via a MOSFET. I have a large reservoir capacitor (4700uF electrolytic) on the high side of the solenoid. I was wondering how ...
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2answers
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Way to discharge solenoid without (heated) resistors?

Here is a simple simulation of a schematic for my solenoid: Once the switch is closed, the solenoid will be activated with ~80mA charge. When it is open (where the screenshot is at) it will discharge ...
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3answers
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Are solenoids/inductors dangerous to have exposed?

An inductor doubtfully will be in a position to be of harm, however a solenoid with 1A+ running through it (and of course a lot of it stored in the magnetic field) can certainly harm the circuit, if ...
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changing direction of solenoid

note I know essentially nothing about solenoids I brought this solenoid thinking that I could use it to hit an object, but when I put it to a power supply, the only direction that it would go is down....
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Is there a device to control the current in a solenoid

I want to control the current in a solenoid using a microcontroller. Ideally, I would an IC which can do PWM with per-cycle current limiting, with an SPI input. Something like the Allegro A3972, with ...
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3answers
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Electrical locking mechanism (on timer)

I'm looking at making a very basic, automatic cat feeder for the odd occasion I'm not around at 2pm when she gets fed. I figured I'd keep things simple by having a door that is spring loaded, but held ...
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6answers
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Irrigation Valve (24VAC Solenoid) Multiplexing

I have a fairly extensive sprinkler system in which I have used all of the available wires. I've added new landscaping that requires irrigation, but without available wires to use for the valve ...
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2answers
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Considerations for powering solenoid and arduino from the same power supply

I'm working on a project where I will need to power a small solenoid (probably 12V) and an Arduino Pro Mini 3.3V (3.3-12V input, onboard circuitry regulates to 3.3V). I'm thinking about using an H-...
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2answers
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Can I use a solid state relay to control a DC current?

Can I use an AC solid state relay to control a DC current as long as the DC voltage doesn't exceed the rated AC voltages? I want to control a solenoid but I'm concerned about the inductance problem ...
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1answer
481 views

How to estimate inductive coupling between distant air coils

I have two air coils. They both have diameter d. There is a distance D between their centres. D is much greater than d (more than 10x greater) Both coils are at different angles, a and b, relative ...
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288 views

Solenoid Relative Force

For all those out there with solenoid experience I'm looking at a project using them for the 555 contest. The spec on most solenoids is ounces of force (at least in the price range I'm looking at). ...
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7answers
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How can I control 128 (or more) solenoids?

I need to switch 128 solenoids either on or off individually, several times a second. I'd like to drive this from either a PC, or an embedded device. How would you recommend I do this? Perhaps ...
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2answers
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Flyback protection for a DC latching solenoid?

I'm looking for a solution for "flyback" protection when driving a 2 wire DC latching solenoid. You cannot use the traditional diode solution as the polarity of the coil is reversed to open or close ...
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293 views

Can Solenoids Get Sticky From Improper Usage?

I bought three spring-return, push-type solenoid. I can't remember them being sticky from the start because I only was using one at a time, but they may have been. Now that I tried to work them ...

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