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

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64 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
94 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 ...
1
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2answers
72 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 ...
2
votes
3answers
215 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
69 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 ...
2
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2answers
117 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
84 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
votes
1answer
93 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
votes
1answer
59 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
185 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
120 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
votes
4answers
228 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
votes
1answer
618 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
votes
1answer
200 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
votes
2answers
309 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
104 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 ...
0
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1answer
158 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 ...
4
votes
1answer
355 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
votes
1answer
72 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
110 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
177 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. ...
2
votes
1answer
211 views

Getting 12V wall wart to power 12v solenoid driven by Arduino

Scenario: Power a solenoid by soldering on the gnd and pwr cables of a 12v wall wart. I found this wall wart in my house that I think will work. From what it says I assume it can transform 120v to ...
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2answers
114 views

Determining the number of turns for a solenoid

I am trying to determine the number of turns that is required in a solenoid to cause it to move an armature inside. From what I understand the greater the B the more force that it can produce on the ...
7
votes
3answers
2k views

How to properly wind coils for a solenoid?

I need to wind a small electromagnet "solenoid?". About 3cm high and 2~5cm wide running at 5V/0.5A. This magnet will be put into a desk bell so it pulls the clapper down and rings the bell. I have ...
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2answers
217 views

why a regular solenoid get hot soon while an audio speaker employed solenoid not? [closed]

I am building a solenoid based equipment. The problem with off the shelf solenoids I figure out is they become hot very quickly. & may burn soon too or at least are not optimal for a constant long ...
2
votes
2answers
219 views

Flyback Diode Placement

In a circuit I'm making I will be using an Arduino to switch a solenoid using a transistor(TIP120). I know I need a flyback diode as shown in basically every example. My question is, is there a limit ...
2
votes
3answers
705 views

What is good device for generating vibrations, offset weight motor or solenoid or some other?

I am building a vibrating device for that I am thinking to use a solenoid for vibration. The solenoid will be used such that device will be mounted in the floor and when a stick is put over solenoid, ...
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1answer
64 views

multiple solenoid activation

I have made some flat strip solenoids of my own.There are about 15 of them and I want to alternately switch group of 6 & 7 or group of 3 solenoids for 5 times successively.I want to know which ...
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votes
2answers
179 views

Do I need a Pull type solenoid or Push type?

I have building a device that will use a solenoid. The solenoid will be used such that it will be mounted in the floor and when a stick is put over it, it will start vibration. That vibration needs to ...
2
votes
2answers
111 views

Choosing proper size of solenoid valve

This is my first question so please let me know what improvements can be made, if I need to edit things, etc. I've recently salvaged a heating element from an old single cup coffee machine that I ...
3
votes
2answers
309 views

Controlling forward/reverse current using arduino & shift registers

I'm trying to control multiple solenoids (home made) using a shift register controlled by an Arduino. Ideally I want to be able to direct them all together either inwards or outward using the current ...
0
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2answers
139 views

Current carrying conductor axially through a copper ring

What effect would a copper ring around a current carrying conductor have on the current in the conductor? How can I go about mathematically modelling the current in the conductor? Details : The ...
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2answers
106 views

Can anyone tell if this component is a solenoid? [closed]

I need a solenoid for a project, so I took apart an old VCR from Goodwill. I was thinking that the ejector for a VCR tape would controlled by a push solenoid mechanism. This is a picture of the part ...
5
votes
3answers
426 views

Solenoids causing Arduino to malfunction despite protection diode

simulate this circuit – Schematic created using CircuitLab I have an Arduino Mega that I'm attempting to control some solenoids and LEDs with. The LEDs are 3.3V, controlled through an ...
0
votes
3answers
284 views

Need a protection diode if only connected by common ground?

I have many solenoids running on 25VDC. Some are controlled by MOSFETs which are powered by a 5VDC circuit, and others are controlled by physical switches in the 25V lines. The 5V and 25V circuits ...
2
votes
1answer
125 views

Switching a solenoid between 2 different AC/DC adapters?

I have build a circuit to turn a solenoid on and off with an Arduino (actually it's 10 solenoids, but that's not important right now), and now I would really like to make it possible to choose between ...
2
votes
2answers
249 views

How to place an indicator light for 24 VDC Solenoid Valve?

I'm using Arduino and relay shield to control five 24 VDC Solenoid Valves. Now I want to place an indicator light (LED) for each valve, so whenever the valve is open, the light comes on. Do I need ...
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votes
1answer
382 views

How do i decide resitance of a DC solenoid valve?

I am designing a circuit for a solenoid valve from BIO-CHEM.SOLENOID VALVE.My product number is 075P2N024-02SQ. I want to know the resistance of valve in order to decide how big a resistance i should ...
3
votes
4answers
323 views

Use old PC power supply for 24v solenoids?

I'd like to use the +12 and -12 leads from an old PC power supply to power 24v irrigation solenoid valves. The values are rated 0.22A inrush current and 0.1A holding current. I only plan on 1 or 2 ...
4
votes
1answer
767 views

Solenoid for opening door latch

I would like to open a door latch with solenoid using a IR reciever (basically remote control). My questions are as follows: What kind of signal (AC/DC) will I require through the solenoid? Is it ...
5
votes
2answers
1k views

Solenoid Driving Circuit

I'm trying to drive a 12v (14W) solenoid and have problems figuring out the components for the driving circuit. The solenoid draws about 1.166A and the MCU is being operated at 3.3V. I've seen many ...
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votes
2answers
487 views

Robotic button pusher [closed]

I purchased a Gigapan Epic Pro a while back (www.gigapan.com). I love this device but I would like to be able to access the buttons on it, from a distance. (I want to mount the unit on top of a ...
4
votes
2answers
560 views

Choosing a MOSFET for solenoid control via Arduino

I'm trying to drive a solenoid I took off an old pinball machine with an Arduino. The pinball machine ran on 25 V AC and I've found that the solenoid was 2 Ω online (so 12.5 A). The Arduino puts out 5 ...
2
votes
2answers
275 views

Controlling the Power of a Solenoid

I am trying to control the force of a solenoid. My current system has a bank of capacitors connected to a relay. In order to control the force (how hard I am trying to hit the object) I am increasing ...
0
votes
0answers
139 views

What Solenoid type should be used when attempting to power with a battery/solar power source?

I am building yet another home irrigation system driven by my raspberry pi. I am using a transistor switching circuit like one linked in Solenoid Electrical Characteristics to switch a 12VDC solenoid ...
5
votes
3answers
467 views

From what used/junk equipment can I salvage solenoids from?

I have a few old 24V solenoids which I've used for years for random (often Halloween-related) projects. I can't recall where I got them. I'd like to get some more, but new ones can be rather high ...
6
votes
1answer
716 views

How can I prevent a 556 timer IC from becoming very hot?

I built the circuit described in a previous question/answer which I will repost here: It's been running quite well, actuating the solenoid at regular intervals as designed. The TIP122 transistor is ...
3
votes
2answers
1k views

555 timer in astable mode: How can I achieve longer low output than high?

I'm attempting to make a simplistic solenoid driver circuit using a standard astable 555 timer configuration with a TIP122 NPN transistor. The problem with the current circuit is that the output is ...
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votes
1answer
400 views

How to calculate current and voltage necessary for a solenoid to lift a given mass to a given position?

When you have a solenoid like without the core above and below, how do you calculate the current and voltage necessary to lift a metal rod of given mass m within the solenoid against gravity to a ...
2
votes
4answers
980 views

Picking out correct MOSFET for solenoid PWM control?

I'm attempting to control an automotive solenoid with PWM at 1250hz. At peak, the solenoid draws 3.75 Amps at 14.4 Volts. The specific problem is that any MOSFET that I've tried gets too hot and ...