Questions tagged [solenoid]

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

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Controlling a solenoid valve with a relay and a 18650 battery

I have a 12 V 18 W (1.5 A) solenoid valve that I want to control valve with an RF relay. I use a Sony 18650 li-on battery to power this system. A 1S 10 A BMS unit is protecting the battery. Even ...
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2 answers
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Switching multiple solenoid valves with microcontroller

I am trying to switch 20 solenoids at 12 V and 2.8 A from a microcontroller. This is the first time I am trying such a thing. And right now I am planning to use a IO expander to get enough pins and ...
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1 answer
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I need a relay that connects a Teensy 4.1 to a solenoid [closed]

I am in a school project. I need a relay that can connect a Teensy 4.1 to a 24 VDC solenoid. The solenoid is rated at 10 W and its product code is D2013-V-VO-C204. I believe the output pins of the ...
-1 votes
1 answer
32 views

How to supply 12V 4 pcs of solenoid water valve

enter link description hereI am trying to control 4pcs of 12V solenoid water valve using Nodemcu and 5V 8-channel relay. The VIN pin and Ground pin of Nodemcu is connected to VCC and Ground pin of the ...
-1 votes
0 answers
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Control solenoid from C# [closed]

I currently have a system built in C# and would like to add a button so that when the user clicks it a solenoid will open (water valve) for x seconds and close. How can I accomplish this? This is ...
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2 answers
80 views

Why doesn't an AC solenoid valve open and close as the AC current alternates? [duplicate]

I'm asking about a true AC solenoid here, not a rectified AC solenoid. Why doesn't an AC solenoid valve open and close with the AC current? I've found descriptions of shading rings, but it appears ...
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1 vote
1 answer
50 views

Powering a 5V solenoid with a 24V digital output

I feel like I have seen many varieties of this question going in the other direction (powering a 24V solenoid with a 3V3 or 5V logic signal) but I'm having issues with finding answers about going in ...
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0 answers
47 views

Current running through drain and source on an N channel MOSFET when the Vgs has not been met

I am attempting to create an electromagnetic paper airplane launcher. I am using a hall effect sensor to detect when a sled is passing a solenoid. I am using an Arduino Uno as my microcontroller so ...
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2 answers
46 views

Appropriate hardware for driving 8 linear solenoids?

I have a project where I plan to drive 9 12 V linear solenoids using a controller (Arduino Uno?) to “play” a recorder. I don’t have a background in electronics systems/design, and I have the following ...
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Capacitor bank for delayed solenoid closure

I have a 24 VDC solenoid valve plumbed in line with a 24 VDC motorized ball valve transporting water. These are redundant because it is critical not to have a valve fail and cause an overfill event. ...
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4 votes
2 answers
408 views

Do pumps and motors also need flyback diodes?

So my question is simple, we know that its good practice to use flyback diodes in solenoid valves and relays, but do pumps and motors also need them as they also have coils?
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Could I use a solenoid to push a wire, without the solenoid's electromagnetism affecting the wire? (or vice versa)

If I have a solenoid, and I put current through it, it would push a metal rod. This rod would be inside of the coil, and have a casing (to not damage the coil). Something like this image on google: I ...
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1 answer
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Thyristor external power supply

I am trying to make a kicker solenoid. My circuit is: 12 V battery connect to DC step up booster 300 V diode thyristor BTW69-1200 with external circuit (battery 1.5 V - resistor 1/4 W, 39 Ω) ...
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2 votes
1 answer
81 views

Basic circuit advice to control a solenoid at different currents

I am looking to control a solenoid at approx 1.4 A, 0.7 A, and 0 A with a rocker switch and will need constant current capable of 100% duty cycle at these currents. The supply voltage will be a 12 V ...
4 votes
2 answers
123 views

Switching kicker solenoid with an idea out of the box

From my previous posting some may know I am planning to make a kicker solenoid. The circuit specs: Coil - 3.5 Ω, 3.4 mH (inductance) Capacitor 1000 μF, 450 V DC booster up to 410 V 12 V DC battery ...
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0 votes
1 answer
47 views

Relay rating for 390 V solenoid

I saw a video using car relay 12V/40A for a solenoid using 390 VDC and about 80A. https://youtu.be/fVGrYoqn-EU https://youtu.be/GsnxzMAczHU I know relay can suppress the back-EMF from coil. I want to ...
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1 vote
1 answer
52 views

DIY fixed voltage solenoid inductor -- do more loops actually make the B field stronger?

I'm building a custom electromagnet. Given the fixed voltage, I'm wondering if there's actually a benefit to putting more wire loop layers in my solenoid given the trade-off of increased resistance/ ...
1 vote
1 answer
48 views

Using a SSR for passing a DC PWM Signal that has positive and negative waveform

I am trying to control the PWM signal to a solenoid via an SSR by passing one leg through it to control the on/off. I have tried 3 different SSR's and none of them fully stop the signal, I still get a ...
2 votes
3 answers
124 views

Overcurrent protection for solenoid driver circuit

I need advice on designing an overcurrent protection circuit for a pinball solenoid driver. I am building new driver boards for several of my games from the late 70s to mid 80s. All use the same board....
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3 votes
3 answers
530 views

Solenoid switching without relays

I have a latching solenoid that operates on 2vdc (at the lowest) all the way up to (as I have tested) 9vdc - the minimum amount of current I have tested it with is 0.01A (which is the lowest my ...
0 votes
3 answers
69 views

Calculating current a capacitor can deliver

I made a simple coilgun circuit Capacitor 50 V 10000 uF DC power supply of 20 V - 5 A Coil of enamelled wire 18 AWG - 3.5 ohm My calculations according to Ohm's law the current in the capacitor ...
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6 votes
1 answer
350 views

Measure inductance of air core inductor

I am making an inductor Air core Wire: 18 AWG guage Turns: (I am not sure ) but could be about 6000 turns The weight of the wire : 400 gram The coil wrapped by machine Coil is 5 cm Diameter of core ...
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8 votes
1 answer
564 views

Why doesn't an AC solenoid coil change magnetic polarity on each cycle?

I am trying to figure out how an AC solenoid coil maintains its N and S magnetic polarity. Since in a sinusoidal AC, current alternates in both directions. How does the solenoid not change polarity (N ...
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3 votes
1 answer
288 views

Calculate the number of turns in air core inductor

Coil specification: Air core coil Length 790 mm Diameter 290 mm Wire guage 18 - 1 mm diameter I need the number of turns to get an inductance of 150 mH. While searching for calculating the number of ...
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0 votes
1 answer
71 views

Latching solenoid supply circuit / control

I have done DC motor control with an H-bridge circuit before. I used a 3.6 V, 9000 mAh (ERC26500) battery and had no problems. Now I want to use a latching solenoid and I need 7.2 V for that, so I ...
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1 vote
4 answers
318 views

Designing an RC snubber for AC solenoid lock (inductive load)

I am designing an AC solenoid lock. Here is my design: Resistance 8 Ω Main outlet power source 220 V - 50 Hz Inductance 150 mH Impedance 47 Ω I (RMS) ~ 5 A I read that the inductive load needs a ...
-1 votes
3 answers
221 views

How to operate a relay (24 VDC 8 mA) from a 4-20mA signal?

I have a PLC that can output a 24 VDC, 4-20 mA signal, but it cannot be turned off - the lowest it can go is 4 mA. I found a relay (J104D2C24VDC.20S, 24VDC, 0.20W) that per the datasheet operates at ...
1 vote
1 answer
135 views

Designing AC kick solenoid lock

I am making a kick solenoid lock with AC. I designed the circuit to run on 220 V, 50 Hz (household plug.) The inductor (coil) is air core 500 turns, 150 meter (500 ft) in length with inductive ...
1 vote
2 answers
80 views

How to make a 220 V AC solenoid lock

I need to make a powerful solenoid lock using 220 V AC. Let say I will use 21 gauge wire and get a length of 24 Ω. This will draw 9 A from the 220 V, so 1980 W. This will be great force ...
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2 votes
3 answers
474 views

Turns in solenoid coil or coilgun

more turns = increase in wire lenght = increase in resistance = decrease in current So how come more coil turns will increase the strength of electromagnetic field
1 vote
2 answers
70 views

Understanding voice voil actuator vendor specifications

I'm thinking of potentially using a linear voice coil actuator to move a 90g mass between 0 mm and 1 mm and back in the horizontal direction with a frequency of 20 Hz. Assuming triangular acceleration,...
0 votes
1 answer
59 views

Can I use AC voltage for a solenoid lock?

I want to make a very high force solenoid lock. I want to use AC over DC because the most voltage I can get from DC is 12 V (I don't have a power source supply more than 12 V). So can I use AC to make ...
-1 votes
1 answer
69 views

How is this solenoid going to last for months? [closed]

After buying a water control unit for my garden I got curious of how it worked, so I picked it apart and had a look before assembling it again :-). It uses 2x1.5V AA Alkaline batteries to output 3V (...
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0 votes
1 answer
86 views

How does a camera flash get high voltage and current from a small battery?

I am a beginner trying to make coilgun. I see videos use camera flash circuit with capacitor that outputs 220V and a good current (5A) from 1.5V AAA battery How does this circuit work to give this ...
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3 answers
86 views

Amp and voltage effect on solenoid coil

If I have battery of 7.4 V and 10 A = 74 watt connect to solenoid coil. And if I have battery of 12 and 6 A = 72 watt (almost 74) connect to solenoid coil. And they are under same situation (same ohm, ...
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3 votes
2 answers
333 views

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, ~...
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2 answers
60 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
1 answer
58 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 ...
0 votes
2 answers
68 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. ...
0 votes
2 answers
91 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 ...
0 votes
0 answers
51 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 ...
0 votes
1 answer
78 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 ...
1 vote
2 answers
326 views

PWM-controlled current source to drive a 24 V proportional solenoid valve using an Arduino

I would like to implement a PWM-controlled current source to drive a 24 V proportional solenoid valve using an Arduino. What I need: Input will be 5 V PWM with 5000 Hz frequency, duty cycle will ...
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0 votes
2 answers
154 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 ...
2 votes
0 answers
98 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 ...
-1 votes
2 answers
48 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 ...
0 votes
1 answer
94 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
0 answers
29 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
1 answer
94 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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0 votes
1 answer
110 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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