Questions tagged [solenoid]

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

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41 views

Use a transistor or MOSFET as a switch to control a solenoid

I am working on a project to control a solenoid (12 V/DC 12.96 W) with an ESP32. I have attached a circuit design as it is in picture. I have couple of questions: Would this circuit work properly? Do ...
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52 views

What equation should I use to calculate inductance of wire coil?

I've been working on a project recently which requires me to build an inductor, however in my research I found many different equations (with a range of variables used and giving very different ...
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63 views

Electronic door latch on a rocket

I'm working on a rocket project; we need to open a door to deploy the parachute. This door will be subject to great forces and must stay closed, until it gets the right signal. I have a few questions: ...
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1answer
56 views

Define the purpose of these components in the operation of this low side driver

I am trying to understand the operation of the following low side driver circuit I found in a schematic of an old pinball machine (redrawn for clarity): L1 is a Solenoid and Q1 is a Darlington BJT (...
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38 views

Connecting Solenoid (12v DC) with a battery source (12v 23A)

i'm a new bee and trying a DIY project with DC solenoids.  I'm having some basic (i hope so) with powering this solenoid - please let can you me know what is wrong with my attempt. Solenoid is : 12v  ...
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66 views

Switch 12v solenoid from 3v3 control signal

I am going in circles on the web and appreciate your help with this novice question, operate a solenoid with a mosfet (original idea, I know). I bought a Gravity DFR0457 to switch a 12V solenoid on ...
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1answer
44 views

Logic Converter driving logic level Mosfet Gate

I am wondering if anyone can comment on the feasibility of this circuit. My ultimate goal is to switch a 12V solenoid on and off using a 3.3V microcontroller, but I have had trouble so far. I want to ...
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25 views

Variable Turn Density Solenoid

I am working on a medical device application and would like to use a solenoid with a variable turn density such that the force \$F\$ on a metal piston within the solenoid cylinder is not constant but ...
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69 views

Logic level mosfet wont drive solenoid

I am trying to find out why my current mosfet is not working by looking over the datasheet. Ultimately I am just trying to buy a mosfet that I know will work, but I want to understand the datasheets ...
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2answers
43 views

Turn on LED when manual switch ON only

The circuit consists of a 12V DC supply, there is a GPIO to turn on the solenoid rated at 12V 500mA. Also, a manual switch is there to turn on the solenoid when needed. The placement of LED and 1K ...
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1answer
33 views

Light up an LED on turning on circuit

I have a 12V DC power supply which would be connected with a solenoid and a manual button as shown in circuit diagram image below. The rating of solenoid is from 9V-12.5V. It takes 500mA at 12V. My ...
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1answer
33 views

Two pin PWM signal to control solenoid/electromagnet

I am building a whiteboard CNC pen plotter for my classroom out of some old 3D printer parts, a Melzi board running Ramps 0.92 and Inkscape to generate the Gcode. I have the machine up and running but ...
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53 views

How long can you power a solenoid? Is heat an acceptable way to check?

I am wondering how long you would expect a standard electromagnetic solenoid like this to be able to be switched on? Any first hand experience would be appreciated. If there is no data on this - is ...
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35 views

Control flow rate of a solenoid valve using PWM

I'm hoping to control the flow of chemical by shutting a solenoid valve periodically over short intervals, similar to this video: https://youtu.be/O49mqn33vBI?t=6 Does anyone know if conventional ...
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1answer
61 views

MOSFET not switching solenoid lock

I'm trying to actuate a solenoid lock with the following specifications from the vendor's page: Working voltage: 12 Vdc Starting current: 0.9 A Steady current: 0.12 A For this application, I'm using ...
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Using a PNP over an NPN to activate a solenoid

I am working on a circuit that controls a solenoid through the use of an Arduino. One question I had was if there was any advantage to using a PNP transistor over an NPN transistor? From class, I know ...
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1answer
61 views

Solenoid driver does not work reliably

I have to drive a solenoid with the following schematic: It works great but sometimes the MIC5020 or the input pin of microcontroller fails and can therefore no longer be pulled high, but I can't ...
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46 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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41 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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1answer
40 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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31 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
66 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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2answers
127 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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2answers
62 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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1answer
115 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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1answer
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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1answer
67 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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1answer
69 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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2answers
126 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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2answers
39 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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72 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
97 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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1answer
62 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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37 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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4answers
756 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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1answer
47 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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46 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
127 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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49 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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1answer
46 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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3answers
2k views

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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1answer
93 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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32 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
36 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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48 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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2answers
38 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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53 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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