# Questions tagged [solenoid]

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

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### Calculating the capacitance of solenoid

I am working on a project where I need to create a fairly strong magnetic field (15~30 mT) with a solenoid. I realized it is not so easy to create a strong electromagnet. The solenoid is 6.5 cm long, ~...
43 views

### Need to switch on a 120V pump with a 48V circuit. Relay? Solenoid? Not Possible?

I am new to relays, etc. Situation: I have a 48V air conditioner on my boat that must be supplied with cooling water from a 120V water pump. The water pump is a completely separate unit. The air ...
1 vote
46 views

### Designing bandpass filter for audio amplifier

I am a 3rd year engineering student currently working on a project where I need to basically make an ultrasensitive metal detector. Basically, I need to create an alternating magnetic field by ...
59 views

### Calculating audio amp output impedance and other general questions [closed]

I'm 3rd year EE student and I am now doing a project where I'm basically making a supersensitive metal detector using solenoids. Solenoid has about 9 ohm resistance with inductance about 13 mH. ...
70 views

### Discharging RC circuit for bi-directional solenoid?

I've attempted to incorporate a discharging RC circuit that will "unlatch" a solenoid when power is turned off. However, I'm not fully confident that I've correctly designed what I hope to ...
49 views

### What could be the cause of a limit in the voltage supplied to a capacitor?

Recently I built a very basic 2-stage coil gun for a school project. Each coil was powered by an electrolytic capacitor. In order to charge the capacitor, the coil connected to an IGBT (insulated-gate ...
68 views

### Unlatch a bi-directional latch when power is lost?

I need to design a feature for a system running on DC power that consists of a bi-directional actuated latch pin that instantaneously engages (extends) and disengages (retracts) via user command. A ...
66 views

### PWM Controlled Current Source to drive 24V Proportional Solenoid Valve using Arduino

I would like to implement a PWM controlled current source to drive 24V proportional solenoid valve using Arduino. What I need are the following: Input will be 5V PWM with 5000Hz frequency, duty cycle ...
113 views

### Firing a solenoid with a timer only ONE SHOT rising edge trigger

I have a button connected to 12V and want to fire a solenoid 24V ONCE every push of the button. No matter if the button is pushed 1 sec or one minute. The solenoid should fire more or less 1 sec and ...
88 views

### Do I properly use Toshiba H-bridge TB67H400ANG?

I am new in this forum, so I am sorry if I don't properly ask my "question". I am a beginner in the making of circuits and Arduino programming. (first time using an H-bridge, first time ...
46 views

### Creating AC magnetic field with DAQ card [closed]

I'm a second year student in electrical engineering. For my project, I am working with magnetic nanoparticles and I need to set up an AC magnetic field. My plan is to build a solenoid (~1200 turns, 10 ...
69 views

### Solenoid valve driver circuit [closed]

Which extra protection components should i use if my solenoid valve of rating 24V 1.7A is driven by the POWER MOSFET IRF540 controlled by Arduino? (Flywheeling diode is there.)
1 vote
27 views

### Upstream pressure on solenoid valve

Does a solenoid valve consume more current when the pressure in the connected pipes is more than normal?
1 vote
84 views

### Undesired and unstable rise in output read voltage of sensors when more components attached to Arduino circuit [closed]

I am making a project which has one air pump run by a L293D motor controller, a few solenoid valves running at 6 volts, and sensors. The air pump and the valves are powered through a 6 volt adapter. ...
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63 views

### FR4, 1 oz. copper, PCB trace width for 48V/8A, pulsed (8 ms pulse length, up to 20Hz)?

I would like to determine suitable trace width for the pulses shown. Other details: The application is to pulse a solenoid; board size is 100mm x 100mm. An LM317 charges a 1000uF cap and the cap is ...
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1 vote
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### What kind of solenoid could be used to engage piano keys like in this example?

I was inspired by the video of Mark Rober and the self-playing Edelweiss piano and would like to build and retro fit a similar contraption on my piano. In the video, a type of solenoid is shown that: ...
• 111
50 views

### How to choose component values in a current drive circuit for solenoid?

I've designed a current drive circuit for a solenoid using a DAC and a MOSFET push-pull setup with feedback based off Figure 4 and 5 in this application note (https://www.analog.com/media/en/technical-...
23 views

### Operate servo based on AC voltage: solenoid replacement

In short, I’m trying to find a substitute for a solenoid in a system that was operating based on 120V. The servo needs to rotate a little shaft about 45 degrees when the voltage comes on, and then ...
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1 vote
64 views

### Switching transistor for micro solenoid

You may have seen some previous posts of mine asking various questions about frequency dividers. I have a circuit I think I am happy with for producing at 1Hz 12.5-25% duty cycle. I now would like to ...
1 vote
36 views

### Could I use a plow solenoid to interrupt my TIG welder with a foot pedal?

I have a multi-process welder that can do TIG, but only with a lift start and a manually opened and closed gas valve on the torch, with no option for a foot pedal. I am planning on adding a foot pedal ...
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1 vote
46 views

### Updated: Solenoid on Momentary Button Circuit - Compatible components? Order to connect?

Disclaimer: I have basically no experience or knowledge in electronic circuitry. I know a lot of people use an Arduino for this stuff, but this is just a one-off project for me. I am making a jetpack ...
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37 views

### Induction on the center of solenoid

Why is the magnetic induction at the middle of the solenoid greater than at the end of the solenoid? I know it's bigger, but the question is why is that?
29 views

### Solenoid magnetic induction graph

I need help solving this problem, if anyone had a similar problem it would help me a lot. A table is given with the current flowing through the solenoid,also values ​​for the magnetic induction vector ...
1 vote
45 views

### Solenoid Controller Options - No Arduino?

I'm a total beginner looking to do a one time project that involves a solenoid. I basically just need the solenoid to extend on the push of a button (which will be push manually in fairly rapid ...
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260 views

### Selecting a flyback diode

According to the schematic below , where J15 connects to solenoid B11HD-255-B-3 and solenoid B11HD-255-B-3 is rated 19V, 90W, what is the technical approach to selecting a flyback diode? (D15) I have ...
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111 views

### Controlling a 24V solenoid with a 5V signal

I have a 24V drawstop solenoid that is for pipe organs to push and pull the organ registers, allowing for airflow through different pipes. The solenoid has two active low control pins, one for pulling ...
• 23
65 views

### 12 V initial to lower voltage continuous step-down circuit

How do I design a step-down circuit that hits 12 V initially, but then drops the voltage for continuous use until turned off? I have a line lock solenoid that requires 12 V to activate. The ...
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42 views

### RPI Touchscreen turns off in solenoid circuit

I have built a medical instrument that has an issue with a RPi touchscreen. The circuit config is as follows: 24v 6A power supply 12V an 5V regulators Large 24V solenoid (https://www.mecalectro.com/...
115 views

### Buck converter chip blowing

I recently designed a buck converter according to the specifications of the chip manufacturer, but for some reason the buck converter chip blows up. I have a Meanwell power supply (HLG-600H-48A) that ...
103 views

### Running multiple solenoids with a seemingly "weaker than it should be" PSU

I work part-time at a piano maintenance center as an electronic engineering student. We receive quite a few self-player piano systems and recently, we got a big Steinway & Sons piano, a very ...
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1 vote
101 views

### Arduino and solenoid with a single power supply

I am trying to create a small project involving controlling a solenoid via an Arduino Uno clone with a single power source. I currently have it set up to power the Arduino with a power adapter rated ...
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125 views

### Solenoids draw way more current required

I have these 12 V solenoids from China. I am using 6 in parallel and since each requires 300 mA, their effective resistance is about 6.67 Ω. This means the current required is around 1.8 A and should ...
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108 views

### The optimal PWM frequency of this proportional solenoid

I have to PWM control this proportional solenoid particularly "GP8 036 A59/150" that works on 12V. I tried from 200Hz to 20kHz - it seems that it accepts any PWM frequency with no overheat ...
84 views

### Electromagnet force and magnetic permeability

In a cylindrical core electromagnet, Magneto-motive force (MMF) = 613 At Magnetic strength (H) = 15345 At/m I am using an iron core with 10% silicon in it, so the saturation magnetic flux density of ...
79 views

### How to drive this solenoid + littleBits?

I have a 5V solenoid, and I am trying to power it from littleBits. I had a littleBits servo bit and cut its wires. The orange wire should be control wire. The reason I want littleBits is because I am ...
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179 views

### Does a flyback diode have to be connected to the + lead of a solenoid, or can it go directly to the power supply?

I am designing a control box to switch 24V DC high speed solenoids at a max frequency of 200Hz. They will be controlled by an Arduino Mega through N channel, rfp30n06le MOSFETs. Here is a photo of the ...
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1 vote
60 views

### Special project elevator floor lamp

I am building a floor lamp made of vintage elevator directional lenses removed from an old hospital. The lenses are from the 50's. I want to simulate an elevator theme for this project. I have all ...
1 vote
112 views

### Controlling relays with logic gates

Pretty new to electrical engineering world, so probably rather simple question. I´m designing control system for tractor trailer hydraulic system. The system is 12 V and solenoids what I am using ...
1 vote
133 views

### Can back EMF from a solenoid trip a circuit breaker?

I am working on an ignition circuit right now in a Cessna 172, the issue is that when the ignition switch is turned to engage the starter, the circuit breaker supplying power from the bus through the ...
42 views

### Solenoid force output and stroke distance

I have a question about the forces a given solenoid can really output. While I can find literature about the forces that are being exerted in a given point in space by the plunger I'm questioning if ...
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### Finding out the magnetic field inside the cross section of the torus which is wrapped by conductive wire and the current flows it

As shown in the diagram , the torus of radius of $~ R ~$ exists . The wire is wrapped around the torus . $$N:=\text{total number of the turns of the wire around the torus }$$ The current is ...
1 vote
62 views

### Scale up current of a pick and hold solenoid drive IC

I am trying to help to salvage a design that doesn't meet a new specification. Circuit needs to drive a solenoid in relatively common fashion: High current pulse to actuate followed by reduced hold ...
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### $\delta n \cdot x + n \cdot \delta x~$ equation of shrunk coil with incremented number of turns per unit length

The very long coil exists with the following information . $$a:=\text{radius of the circle of the coil}$$ $$n:=\text{number of turns of the coil per unit length}$$  x:=\text{lenght of the ...
1 vote
187 views

### Can I trigger a latch solenoid valve using a stepper motor driver (A4988)?

I would like to turn on/off a solenoid valve like this one: CLABER 90812 From what I leaned googling around, it seems that it requires a positive/negative pulse to turn it on/off. In practice, I need ...
45 views

### Problem with Amp Turn calculations for electromagnet

I'm attempting to design an electromagnet, and the equations seemed to produce an nonsensical result. The electromagnet needs to impart 42.75 newtons at 0.0015875 meters. I needed to discern the Amp ...
1 vote
72 views

### Stop 'bouncing' input from float sensor

I'm trying to resolve an electro-mechanical issue to do with a water fill solenoid, that is triggered by a float valve. The problem is as the water approaches full, the float bounces causing the ...
34 views

### Supercapacitor Solar Cell Locking Device

I am trying to use a solar cell to power a locking device. The solar cell being used is a custom 10W 9V. It charges a lithium ion battery which is used to power an MCU and a couple of other things (...
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1 vote
38 views

### Solenoid Train - Best approach for magnetically guiding an object along a path?

My project is to pull an object along a path with solenoids, by cycling their on/off state. I don't know if ferrous core solenoids pulling steel would be more efficient than pulling a neodymium ...
• 11
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### Is a run-time adjustable boost converter possible?

I have a power supply that ranges from 12V-30V. I want to power a set of 4 (24V, 1A) solenoids in series. I also want to use a reduced hold current. So, I'm looking for an output of 96V for a time (~...
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