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

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Cheap reliable solenoids with datasheet [on hold]

We need to buy ~40 solenoids for our senior project, but there is an issue. Our prefered solenoids are on ebay for ~4$ each, but they don't have any datasheet. Our other option of amazon with ...
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1answer
37 views

Magnetic flux outside a solenoid perpendicular to the direction of axis of solenoid

I know that using straight forward Biot-Svart law it is possible to calculate field inside a solenoid or at a point on an axis away from the circular coil. Now is it possible to calculate the Flux ...
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1answer
31 views

Alternate to a proportional linear solenoid

I am trying to build a circuit using gears, motors, and relays only which mimics the motion of a proportional linear solenoid i.e. Hold a spring compressed at a certain distance depending on the ...
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1answer
57 views

Using a solenoid to open a door

I'm trying to rig up my door to be unlockable using RFID and an Arduino. The problem is the actual mechanics of unlocking the door. There's a few limitations: I can't actually unlock the door. It's ...
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1answer
36 views

Bistable solenoid unlatching voltage

In my design two solenoids (MagLatch C5-L-272-B-1 and MagLatch B22M-L-154-M-36) are used. Each solenoid is driven by a H bridge powered by a voltage selector (12V or 24V). The command signals are ...
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50 views

change polarity of Solenoid

I am working on a project which includes a couple of Solenoids (Link to the used Solenoid: ...
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1answer
59 views

Using a MOSFET or BJT instead of solenoid

I'm trying to convert all relays and solenoids to transistors in a circuit to make it solid state. I have a small (150cc) 12V DC starter motor that is currently turned on by a small transistor turning ...
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2answers
55 views

Are all solenoids waterproof?

I have an application where I need a solenoid to control a valve at the bottom of a tank. For unimportant reasons the valve needs to be inside the tank at the bottom. I was wondering are all ...
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2answers
118 views

Supercapacitors vs. High Voltage Capacitors with Inductive loads used in CoilGuns or Solenoids

I'm looking for some insight on whether an 1000 Farads at 2.7v or 5.5v would be more effective than say 10,000uF at 400v-450v when creating a strong magnetic coil. The intent is something similar to ...
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2answers
108 views

Linear regulated supply from noisy input voltage

I have been working to redesign a faulty circuit board. One of the problems I have identified is the power supply on the board. The input voltage is nominally 13.8V DC from an AC switchmode ...
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2answers
79 views

LED monitor for solenoid

I'm trying to determine whether it is more appropriate to place an LED in series or in parallel with a solenoid. The application is to monitor the solenoid, i.e. if the solenoid is burnt out, the LED ...
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1answer
38 views

Selecting continuous pull type solenoid

I own a Rail track master and it needs two pull type continuous solenoids. The age of this machine is from the 1950's and both of the previous solenoids were unidentifiable. These solenoids operate ...
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1answer
90 views

Driving a solenoid with a relay

I'm trying to run a backup pump that will be actuated by a no flow condition from the primary pump. Everything is 12V DC. The flow switch can only handle 0.4A at 12V DC. The issue I'm running into is ...
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2answers
73 views

Minimal pulse width to actuate a solenoid

I'm powering a solenoid from a battery, so I want to spend the minimum amount of power to get the job done. In this case the solenoid doesn't even have a return spring, so as soon as the armature has ...
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2answers
106 views

How to actuate 24V solenoids from 3.6V batteries

I want to build a battery-powered device that actuates a 24 V solenoid when a button is pressed. How could I power it from a 18650-sized lithium-ion cell? It should work down to about 3 V, when it's ...
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2answers
75 views

Solenoid Fail - No Force

I have designed and built a small solenoid and... it doesn't exert any force on the steel bolt I am using as a plunger. I could freely move the plunger back and forth without any resistance. I am ...
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2answers
142 views

Bidirectional solid state switch for solenoid

I'm building a circuit to control a flip dot display, which is basically a matrix of solenoids which you control with bidirectional current across the 25 columns and 7 rows of the board. The ...
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1answer
46 views

24V failsafe switch that cuts power untill power is removed and reapplied

Does anyone know of a device that when current is applied it will stay on for a certain period of time then turn off until current is removed and reapplied? Basically I have a float switch that, ...
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1answer
60 views

Can a solenoid have its magnetic field “focused”?

Imagine a solenoid generating a magnetic field. Can this field be focused so that it exists only in a certain section of that solenoid at a given time. If a typical solenoid looked like: ...
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1answer
85 views

Solenoid to launch a ping pong ball

I've been looking for ideas on how to launch a ping pong ball a small distance (< 1 metre) for a game. Solenoids look like they might be useful but I'm not 100% on what force/type I need. I can ...
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2answers
104 views

Can I use a LED Driver to control a Solenoid?

I have on order an LED driver and I want to use it as a simple 12v DC output to control a Solenoid Valve. The Driver says Constant Current & Constant Voltage. I obviously don't want 1A pumped ...
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2answers
50 views

Alter Solenoid Stroke

I am looking into using push type solenoids to push microwave touch pad buttons. I understand that the force a solenoid exerts is dependent on stroke length. One site I was looking at listed two ...
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1answer
122 views

Can a Solenoid be driven from one of the pins of a Servo controller?

Would it be possible to operate a solenoid (e.g. this Plastic Water Solenoid Valve - 12V - 1/2" Nominal, suggested for use with "a TIP120 or N-Channel power FET with a 1N4001 kickback diode to drive ...
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1answer
162 views

Arduino - Controlling Electromagnets/Solenoids

I'm a French student and today I have to control some magnetic things with an Arduino. It seems to be electromagnets, but I'm not sure, since I'm a complete novice to electronics. I saw some ...
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2answers
185 views

Solenoid stays on when output turned off

I have a power supply with 12V running into a the common on my PLC. Output 0 on the PLC is wired into a solenoid. The negative on the solenoid runs into the ground on the power supply completing the ...
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2answers
52 views

How the wire of an electric motor produce electricity [closed]

If the wire of a electric motor is insulated, then how will it produce electricity? ??
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111 views

Controlling Solenoids using Relay vs Transistor

In several examples, relays were used to control solenoids, others use the transistor. In my question, I'm looking at controlling 24VDC solenoid pneumatic valves. What are the advantages and ...
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2answers
902 views

Control 12 solenoids with a raspberry pi

I'm a musician and I'm working on a funny project : control solenoids with a midi keyboard. So I have a MIDI keyboard connected to my raspberry pi connected to my breadboard. Until now everything is ...
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3answers
74 views

2 momentary switches, controlling 4 outputs in sequence using latching type relays

I am interested in building a solenoid controller using latching type relays(containing 2 coils and DPDT). The relays are controlled using two momentary switches. The action I am looking to get is by ...
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1answer
118 views

Need a transistor to drive 12v 400mA Solenoid

I need a transistor whose base will be driven by a controller (3mA max base current). the Vce(sat) should be less than 0.5 or max 0.7. And collector current required by solenoid is 400mA. I am unable ...
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2answers
238 views

How to supply power to a 12V solenoid from China, getting hot

I bought this solenoid from ebay and was wondering how to power it. It says 12 volts as you can also see from the picture, but I tested it with putting a 9V battery straight to its terminals for a ...
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2answers
330 views

Bidirectional driving solenoid using H bridge and raspberry pi

I want to drive a old phone ringer solenoid bidirectionally (20 Hz) using raspberry Pi GPIO pins. I am new to electronics, but I thought a H-bridge design would work to do this: The solenoid is 500 ...
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3answers
667 views

My DIY solenoid does not work

DESCRIPTION: Hi there, I don't know lot about electricity and I`m having problems with my first solenoid-prototype, I tried to build it watching you tube videos. I have attached the pictures of the ...
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1answer
96 views

When -EMF is induced can we keep current the same?

I'm confused at how Back EMF or (-V, -EMF) reduces current, and conserving the overall power. Let use the following simple example to help my understanding: A solenoid produces a magnetic field B, it ...
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2answers
548 views

How much force does a solenoid really have?

This hopefully isn't too off topic for this forum, but here goes: after many days of tinkering I managed to get a circuit working that, in the end, energizes a solenoid to pull a lever. Sadly, even ...
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1answer
103 views

Powerful electromagnet?

Is it possible to produce over 1000 lb of magnetic force over a distance of 4 inches(0.101 meters), using an electromagnet? How difficult would it be? Explaining the general spec's of such an ...
2
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1answer
192 views

AC solenoid valve with DC

I have a 24VAC/60Hz solenoid. I used 12VDC just to try, and it worked good (well needless to say it worked as expected with 24VAC/60Hz). What are the effects of a solenoid that's projected for AC ...
2
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1answer
79 views

PNP (MMBT4403) based solenoid driver?

I'm trying to drive this solenoid with an inverse logic output (from a 74154). Here's what I have in mind at the moment. simulate this circuit – Schematic created using CircuitLab R3 is ...
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2answers
570 views

How to power a 12V solenoid

I bought 2 solenoid valves. I'm looking to turn them on/off using my relay. However, I'm not sure what the best way to power them would be. Do I plug them directly into the wall (after attaching a ...
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2answers
229 views

Linear motion - 50mm / 15 N

I need your help or advice. I need somehow to make a linear motion with stroke of 50 mm and starting force about 10N, the holding force after pull (stroke of 50mm) should be at least 20N. The holding ...
4
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4answers
562 views

How to decrease solenoid speed?

My project is Speed Control of a solenoid. In this project, stroke is 30 mm and I want to plunger cross 30mm in a few seconds (like 5 seconds). For this purpose I want to control the current of the ...
3
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1answer
2k views

Connecting microcontroller 3.3V output to relay using ULN2803A

I have a need to connect an ARM micro-controller with 3.3V digital output pins to a few 12V solenoid water valves. I figured that I can use a ULN2803A for this task. The internal circuit for each ...
2
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1answer
304 views

Clamp diode to a solenoid activated by a raspbery pi, how do I choose it?

I need to activate a solenoid using a raspberry Pi, to do that I'm using a TIP121 to drive the current and a 12V power supply to power the solenoid. I also put a clamping diode (1N4001) but I'm not ...
2
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2answers
616 views

Is a C2328 Transistor OK to use instead of a 2N2222?

I have this simple circuit to drive a 5v solenoid. I made it all except that Q1 is a C2328A transistor I pulled out of an old power supply and C2 is a 220uF cap. D1 is just a diode I took out from ...
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1answer
217 views

Is it the frequency that determines the current in a LC Tank Parallel Circuit?

Jump a head to the question if you aren't interested in the background of my project Background of my project I want to create objects of metal. So I need to be able to cast a metal. Aluminium seems ...
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1answer
302 views

I have a 110 VAC solenoid and want to know what kind of circuit i should build to control it from my microcontroller?

My solenoid is part of an old espresso machine, the circuit that detected low water level died and i can't replace it. I am adding a micro-controller to remotely turn it on and off and to control this ...
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1answer
533 views

Circuit to control a impulse solenoid valve from a movement detector

I have a movement detector sensor that generate a pulse (3.3V TTL) for 60 seconds when something moves in front of it. On the other hand, I have a impulse solenoid valve that close on a negative ...
3
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1answer
115 views

Torus shaped solenoid

I need to use one of those for an experiment (a solenoid with the shape of a torus). Unfortunately, as you can see, I don't know the appropriate name for it. I have built myself a temporary one but ...
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1answer
122 views

sophisticated push type solenoid needed for vibrational output-Push type Tabular ?? [closed]

I am looking for a sophisticated push type solenoid. By sophisticated I mean I can control its plunger movement to move following a pattern by a micro controller, over a stroke length of about 10mm. ...
2
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5answers
255 views

Is a solenoid considered a DC Motor?

For our senior project we are making an electronic door lock controlled by a raspberry pi. We created a proposal which was approved for all the specs for creating the device which we have to abide by. ...