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

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51 views

Procedure for finding the right MOSFET, diode and resistor to make a solenoid valve open/close?

I need a right MOSFET to make a 8 valves open/close about 15 times per second! It needs to switch very fast. Anything that can slows the speed of the valves is not desirable. From what I see the ...
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4answers
102 views

12V solenoid drawing more current than it needs

I'm fairly new to practical electronics so I apologize if any of this is obvious. I am currently trying to use a microcontroller to control the energizing of several 12V solenoid valves using a PC ...
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2answers
48 views

Calculating peak current of solenoids

I'm a electronics newbie, and I'm making a project with 8 24v solenoids playing percussion quickly. I want to power these all with the same power source, so I'm being careful. This is similar to ...
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2answers
55 views

Electrolytic Capacitor in Solenoid Circuit

I was looking at a few solenoid circuits. I came across this one that had an electrolytic capacitor across it (whereas most just seemed to skip it). Does this capacitor serve any other purpose ...
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0answers
24 views

Driving solenoid with Microcontroller with variable strength

I am working on an interface to trigger physical drums with solenoids. Therefore I need to not only drive the Solenoids Hi/Low, but also change the force - ideally using PWM for each individual ...
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1answer
41 views

Sprinkler Control Power supply requirements questions

Not sure if this is the right forum or not... I am looking to build a custom sprinkler controller using a Raspberry Pi and a relay board. The question is around the power supply. The valve ...
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35 views

Solenoid Core Coil

Friends, I am working with Air core Solenoid coils. While I am calculating the lifting magnetic force of the actuator the answer I get is in Henries or in Tesla. Actually I am tying a 50gram weight in ...
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2answers
108 views

Many small and cheap linear actuators [closed]

Me and my friends are trying to build a linear actuator matrix. It's supposed to be a grid of pins that go up and down at reasonably fast speed (more than 1cm/s, the faster the better). Problem is, ...
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1answer
43 views

What kind of relay do I need for for 12V source with a 5V control voltage

Trying to figure out which relay I need for a project I'm working on. The source is a 12V battery, and I'm looking to turn on a 12v solenoid using a relay. I want the control voltage on the rely to be ...
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20 views

Circuit modification of OSBee shield for Arduino

I purchased OSBee shield board to control 24V Solenoid Valve. It utilized 5V external power to charge a capacitor and then release charge to open/close solenoid valve. However, I found sometimes it ...
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2answers
91 views

Is this the behavior of a broken mosfet?

I designed this circuit to switch on/off 8 solenoid valves for a programmable dancing fountain that I am building. The GPIO is coming from a Raspberry Pi. VCC is coming from a 12V deep cycle car ...
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35 views

Solenoid Circuit: MOSFET switch help

I am trying to operate a 5V solenoid using a IRLZ44N power MOSFET. My problem is I cannot get the MOSFET switch to work. My circuit: 5V into solenoid and diode (1n4004) in parallel into the drain of ...
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2answers
92 views

EMC considerations for driving a solenoid via PWM over a long cable

We're designing a circuit which essentially has the topology shown below. We're driving an inductive load (24V, 3.8Ohm solenoid - max avg current = 2A, but peak current can be 6.3A) using PWM. ...
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1answer
50 views

Might I be better off using a TIP122 Darlington than a FQP30N06L MOSFET?

This is a followup to: Simple ESD protection for MOSFETS I built the circuit described in the above post using FQP30N06L MOSFETs and after several hours of testing two of the MOSFETS died at nearly ...
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1answer
64 views

Need to choose between 48 solenoids, trying to design a proper circuit to do so

I am in the process of designing a project that will allow a Raspberry Pi to "print" to an old (60s) electric typewriter. I have decided to have a push-solenoid for each key (24V), for 48 total keys. ...
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43 views

Reversing motion on a bi-directional solenoid

I have a Ledex 4EM rotary solenoid (26awg winding) that, by using permanent magnets in its construction, changes direction depending on input polarity. I want to actuate this solenoid in one direction ...
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2answers
58 views

Inductor Reactance

I have a few questions about the reactance of inductors at certain frequencies. I have been working on a project that involves flipping the field in a solenoid with an air core at ~10-20 kHz with a ...
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2answers
105 views

Solenoid Driver Circuit

I want to drive a solenoid (12V load and 20A rating) using a MOSFET and an Arduino. What kind of switching circuit should I use?
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1answer
93 views

Tubular Solenoids and Arduino

I am interested in using this Tubular Solenoid at 3 DC voltage to operate in Continuous (100%) Duty Cycle. According to the specifications the solenoid can operate at a: Continuous (100%) Duty ...
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1answer
126 views

Can someone recommend a relatively small device that can move a 2 1/2 inch sphere weighing 6 oz 20 feet?

I am trying to find a method (solenoid?) by which I can strike and move a 2 1/2 inch ball that weighs 6oz with enough force to propel it up to 20 feet. Can a solenoid do this? I would not want to ...
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2answers
141 views

Solenoid strong enough to open lock latch [closed]

I am new to electronics and am trying to build a fun project that needs a solenoid strong enough to push/pull the latch open of a masterlock (thats open or combo has already been entered) Im not sure ...
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3answers
129 views

Help with simple Arduino/Transistor/Solenoid circuit

I'm trying to use an Arduino+transistor to control a shutter (which I believe is a solenoid) at work. The shutter is normally connected to a power supply by two small wires (positive and negative) and ...
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4answers
136 views

Basic question - multiple solenoids in parallel

Please excuse my ignorance - I am first and foremost a software person, and I only fool around occasionally with hardware... I want to get 5-6 solenoid valves working in parallel. The solenoids are ...
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2answers
180 views

arduino mosfet solenoid

I'm trying to drive a solenoid with an arduino pro. I've assembled the typical MOSFET approach with a protection rectifier: The circuit works, and the solenoid is triggered, but very weakly. In ...
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0answers
58 views

EMI/EMC filters for different frequency sub-circuits

I am designing a PWM based solenoid controller. The PWM controller works at 23kHz with an average circuit consumption of 23-45mA. The PWM controller is powered by a non-isolated SMPS with 12V output ...
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1answer
63 views

mechanical relay output voltage doesn't change

As a followup to my previous question, where a 2222 npn transistor wasn't beefy enough to handle the load I was putting on it to activate a solenoid valve, I decided to try a mechanical relay board ...
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2answers
103 views

transistor toggles an LED, but not a solenoid valve

I'm working on a hobby project where I'm trying to drive a solenoid valve with an arduino (for some automated plant watering). The solenoid valve takes 12v, so I've rigged up some smaller batteries ...
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1answer
194 views

Actuating a solenoid through a capacitor

I would like to actuate a latching solenoid through the following circuit: simulate this circuit – Schematic created using CircuitLab A capacitor is charged over a resistor. When this ...
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2answers
367 views

Latching solenoid control

I am working on a personal project that will involve driving a latching 9V/DC solenoid from an arduino. The circuit I've come up with is dependent on two things, that I haven't quite figured out yet: ...
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1answer
185 views

Simple ESD protection for MOSFETS

I'm designing a MOSFET (FQP30N06L) circuit to drive a (50V, 3.4ohm) pinball solenoid controlled by a PWM pin on an Arduino DUE: simulate this circuit – Schematic created using CircuitLab ...
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1answer
115 views

solenoid hammer trigger control

I am new here and a newbie regarding electronics, I shoot PCP air rifles and have a small project regarding the air rifle. The shooting mechanism is consisted of a trigger releasing a spring loaded ...
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2answers
164 views

Electrical behavior of holding magnets when you pull them apart

I'm going to buy a holding electromagnet and a strike plate to hold some things, and I want to design my circuit (arduino-controlled) not to fry like bacon. I'm aware that since a holding magnet is ...
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1answer
59 views

Determine the speed of a solenoid

I've found this solenoid online. In my current project I try to generate fake recoil for a lasertag marker. Now my question is: Can I determine the time the solenoid needs for completing one cycle? ...
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1answer
59 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
47 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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2answers
91 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
83 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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0answers
75 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
92 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
94 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
440 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
133 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
111 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
70 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
106 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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3answers
133 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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3answers
200 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
118 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
240 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
61 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, ...