Questions tagged [solenoid]

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

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41 views

Controlled solenoid stroke length

Let me create a scenario to better illustrate the problem I have 1500 pens that I want to individually actuate upwards with 3 different distances, ex: 10mm/15mm/20mm I thought I could use a solenoid ...
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40 views

How far should circuit be from solenoid

I am creating a circuit which is controlling a solenoid valve and I was wondering what is a safe distance to keep this circuit from the solenoid valve. Circuit includes an ESP module and some other ...
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33 views

Charging Battery via solar panel to power a push action solenoid

This is my first project ever, I'm running into some problems with the power supply stage, I hope you could help! I want to power a solenoid (12v/2A), which will get its voltage from a battery (12V/...
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24 views

Requesting wiring feedback - Arduino/ESP32 solenoid/transducer, temp probe

2 questions: Can you please tell me if this circuit wiring is correct for the 3 sensors I am trying to connect to my ESP32? Is there a risk for EMI using the ethernet cable with these sensors/...
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1answer
64 views

Electronic components that can pull a string around 5cm and then suddenly release it?

I have very basic electronics knowledge. I'm looking to build a very simple circuit that pulls on a string which will start a pendulum swing. I was initially thinking using of a using linear solenoid ...
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68 views

What battery do I use to power solenoid?

Hello I’m quite new to electrical work and I’m trying to open and close a solenoid valve with a battery. I have bought these tiny 23a 12v battery. The solenoid says it needs 12v dc. I have no idea why ...
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59 views

What are the side effects of having unwanted knots in a solenoid / enameled wire loop?

I've been winding a guitar pickup and occasionally there will be knots in the thread of enameled wire from my spool. Some of them are loose enough that I can untie them, but there are some really ...
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88 views

Best copper wire for solenoid

I am going to make a solenoid that will only be required to lift a small metal rod for a couple of seconds - and not very often. It has to run of a standard 9V battery and the small rod should be as ...
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79 views

Why does this 6V solenoid activate on 4 AA batteries but not on a MT3608 step up booster?

I have a JF-0530B 6V solenoid that is rated at 300mA, and if I hook it up to 4 AA batteries it indeed activates on the roughly 6V the batteries supply. However, I also have an MT3608 step up converter ...
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45 views

Degradation of resonant sine wave signal in coil/solenoid after adding second layer

I have hand-wrapped a couple of air core tube coils/solenoids with 50 gauge wire (0.001 inch diameter). My goal is to obtain a resonant frequency of ~10 khz without the use of a capacitor and to keep ...
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42 views

Controlling a AC valve solenoid using a SSR relay

I have a micro controller based irrigation controller which should control solenoid valves. The solenoid is 24V AC type, with 25 Ohm resistance. I am considering to use some triac based SSR to switch ...
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65 views

How do I apply Ampere's law for a solenoid with a core?

I have a solenoid with a ferromagnetic core (like a transformer). Now we know that the magnetic field H, is fully restricted inside the ferromagnetic core. My problem is with the application of Ampere'...
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106 views

Can I extend the life of a solenoid by reducing its supply voltage?

Say that I have a 12VDC 2A rated solenoid, but I test the lowest voltage that my solenoid operates reliably for my specific application. Could I just operate the solenoid at this lower voltage to ...
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37 views

Power saving circuit in pneumatic valve

I am looking for a pneumatic valve and I refereed a catalog. It has a power saving circuit in the valve and there is a circuit diagram and description of that. I couldn't understand how this power ...
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49 views

How do I prevent my BMS from tripping when solenoid is connected?

I am working on a project that is effectively just a battery powered reticulation system. It is charged through a solar array and cheap MPPT charger, which connects into the battery via the BMS. The ...
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1answer
94 views

What kind of motor is this? Looks more like a solenoid than a motor

I was going through a large box of random motors I got at a yard sale. I was sorting them for use in later projects when I came across a motor I couldn't classify. Long story short, the magic smoke ...
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48 views

Short circuit of solenoid's windings

I wanted to short a solenoid, so I just touched the wire of two adjacent loops at a point somewhere in between of solenoid, but now I wanted to know what changes occur in its inductance and ...
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34 views

AC LC Filter for a Solenoid - Unexpected Behavior

I've been working on a circuit that uses a microcontroller and an H-bridge with 34VDC supply to control a variety of low voltage loads including 24VAC solenoids at 50/60Hz (SHEPWM waveform to knock ...
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745 views

What would happen to the magnetic fields of a solenoid if it were wrapped around a hollow ferromagnetic core?

I'm well aware that a solenoid wrapped around a solid ferromagnetic core produces a stronger magnetic field, but what about a hollow ferromagnetic core? Would the fields farther from the center near ...
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1answer
28 views

Suitable amplifier for relay controlling solenoid valve

I have a vacuum gauge with on board relays that trip at set pressures. They have a rating of 30 VDC, 1 A. The solenoid valve I need to control is 50 VDC with max current 3A (also is inductive load of ...
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42 views

Will This Solenoid Driver Circuit Draw Any Current When Control Input is Disconnected?

I'm working on a battery powered circuit board to drive a small solenoid motor, simple TIP120 as a voltage controlled switch grounding one of the motor terminals. I'm wondering whether or not I need ...
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38 views

Does the solenoid force formula apply to electromagnets?

Related questions: How to calculate the repulsion force between two electromagnets With what force can a solenoid pull? What assumptions does the solenoid force equation make? I am trying to design ...
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43 views

What voltage do I need for my solenoid magnet?

I am looking to buy a suitable solenoid magnet for an experiment. The experiment is quite primitive but I do need the right magnet although my knowledge of electromagnetism or electrical engineering ...
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1answer
104 views

How does a washing machine intake solenoid valve control flow rate? [closed]

Our washing machine, an AEG L69480VFL ( seen here ) has a pair of solenoid valves on its water intake looking like this: (One controls the flow to a tube running to a detergent compartment, the ...
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47 views

Jumping ring demonstration

In demonstration of jumping ring if we assume dc source connected to solenoid, according to most of books, when we place a metallic ring over the solenoid and as soon as we turned on current, due to ...
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45 views

Circuit giving values on both AC and DC

I have a generator stopper which works on 220 volt AC (in India 220 volt AC is normal supply) and has an electromagnet which pulls up a lever and the generator is stopped. It works perfectly when the ...
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How critical is winding a solenoid/electromagnet neatly?

We've all seen the expensive toroidal winding machines on YouTube, and manufactured solenoids are always so neat in construction - as in: Each winding is neatly packed to its previous, without ...
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77 views

How to use a proximity sensor with a solenoid

Could you please help me with the following issue. It is a basic problem but I need help anyway. Please refer to the picture below. . In fact, I would like to use a proximity sensor in order to ...
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28 views

Solenoid flyback considerations in this pFET/nFET inversion circuit

I am trying to combine FETs, where logic permits, to reduce the size of a pcb. Is it poor practice to have the pFET's gate and nFET's drain shared by an inductive load that will usually be grounded ...
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1answer
32 views

Adding an LED through a FET circuit that currently drives a solenoid

I would like to save space on a layout by consolidating a FET or two, where feasible, on an existing board. One of the FETs used, a coolMOS P7 series (IPA60R280P7SXKSA1), seems to have the drain ...
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25 views

Solenoid Actuator (Linear) Force Calculation

what is the simplest form of law to calculate Solenoid electromagnetic force. i.e. a relation between force and electric current knowing that i'm given a Force constant with measuring unit N/A^2 (...
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37 views

How do I determine how long I can keep my solenoid powered, for safety sake and before ordering it?

I got a solenoid recently, a DSOS-0416-24D from DigiKey, but it gets pretty hot after only 2 seconds of engaging it. How can I know ahead of time what kind of heat a solenoid can withstand, and how ...
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49 views

How to trigger 50v solenoid with 120v AC

I have an old clock with an analog circuit and the timing sync mechanism gets triggered by a solenoid that likely requires 40-50v. The only power input into the circuit is 120v AC. Ideally I'd like ...
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27 views

Optocupler-Mosfet output for various output

I'm designing a board equipped with a MCU (atmega4809) that need to control different type of industrial graded equipment at 24VDC. These will be mainly a relay or a solenoid coil for pneumatic valve. ...
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1answer
67 views

Running AC solenoid vibration pump with DC voltage

Ulka e series solenoid vibration pump works with Ac voltage directly connected to main power. They are rated at 220, 110, 24 voltage 50-60 Hz. These pumps use an internal diode for removing half cycle ...
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1answer
88 views

Circuit to control 24VAC OR 24VDC solenoids

Is there a circuit out there that could control both 24VDC or 24VAC solenoids from a 24VDC power supply? I am working on a sprinkler control board that I would like to be able to use both on. The ...
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340 views

Emergency Backup Battery Supply

I am building a NodeMCU controlled 12v solenoid. I am hoping to add an emergency backup battery supply, but the emergency backup supply should not power anything but the solenoid. In other words, if ...
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983 views

How to build a programmable sticky button

I'm trying to build a button that can exist in two modes. Either it springs back after being pressed, or it stays pressed. I want to switch between these two modes using some complex logic, controlled ...
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2answers
43 views

Micro-controller drives solenoid 12 volt through interposing relay 5 volt issue

Purpose of attached circuit: driving a solenoid (cabinet lock) from microcontroller through relay with a 5 volt coil. Components: ATMEGA8 Relay 5 volt with NO Contact Solenoid 12 volt power supply ...
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133 views

Need a solenoid to pull a Nerf Gun trigger

I'm looking for a solenoid that be used to pull the trigger of a Nerf gun. Using a strain gauge I determined that you need about 1 kg of force to pull the trigger, and the travel of the trigger is ...
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104 views

Solenoid Getting Hot and Not Functioning Properly

Please forgive my ignorance on this schematic. I am new to using relays and solenoids so my diagram may be a bit inaccurate. I am attempting to control a DC solenoid with the GPIO pins from a ...
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448 views

Best MOSFET to control small 12v load with NodeMCU? [closed]

I am pretty familiar with Arduino, and I will be using a NodeMCU for an upcoming project I'm doing. I have never used a NodeMCU before. I am using it along with a few sensors to turn on and off some ...
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1answer
51 views

What assumptions does the solenoid force equation make?

$$F = (N⋅I)^2⋅uA/(2g^2)$$ F = Force I = Current N = Number of turns g = Length of the gap between the solenoid and the magnetizable metal A = Area Does it assume a solenoid of zero length and does ...
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1answer
55 views

Solenoid Simulated Recoil

I have the body of an old Airsoft M4A1 and I had the idea of making it have simulated recoil through a solenoid. I realize that I can't make something with the kick of a real gun but at least ...
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2answers
145 views

Why does the measured back-emf decrease when R is shorted in this circuit?

In the following circuit I move an iron rod back and forth inside a solenoid (represented by Rsol and Lsol) and measure voltage fluctuations across the terminals. I do this under two scenarios: with ...
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118 views

How can I create a controllable solenoid array?

So to briefly summarize my situation, I am trying to create a programmable solenoid array that will be used to raise and lower pins for a braille display. Considering that each braille character has 6 ...
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1answer
62 views

Attempting to switch on and off a 4.5v solenoid with a transistor. using push button to control input

I have a very simple setup powered by a 9v battery. The lock solenoid when connected directly to the battery works great. I have built a test circuit using a push button and a transistor in an ...
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1answer
117 views

Solenoid and mechanical damping, options for ways to minimize

I have an iron rod supported by a coil spring that vibrates vertically within a solenoid coil. The solenoid has a 5 ohm dc resistance. There is no physical contact between the coil and rod. As I ...
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1answer
90 views

MOSFET for PWM control on a solenoid

I’m currently working on a project where I am utilizing PWM on an Arduino to control a solenoid proportionally. I am designing a device that will play the piano. I would like it to mimic hand ...
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210 views

What drives the increase in current in LR circuit?

The current in LR circuit increases like this, I could understand the math which produces the graph by making sure the voltage sum is zero. But conceptually, I don't know what actually happens in ...

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