Questions tagged [solenoid]
An electromagnet combined with an actuator to convert electrical energy into linear physical motion.
692 questions
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Decoupling load switching current from PSU
I'm having trouble understanding the flow of current in a design I've been given. My main source of confusion is coming how current accumulated from source to the load.
A bit more information about ...
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Is a Snubber Needed for a 17 Ohm Coil with a Free-Wheeling Diode?
I am analyzing an existing design that drives a 22 milli-Henry 17 Ohm coil connected across the RED/BLACK terminals shown in the snippet below. The coil is driven by 24V.
Running LTspice simulations ...
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Order of series RLC components - same circuit, different values
I'm learning about series RLC and I want to ask a question/confirm my theory on what's happening in the circuit.
I want to ask about the order in the RLC, the only difference between the circuits are ...
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Confirmation about coil polarity
I found this picture and I think it might have an error in the diagram. It shows the current flowing from positive to negative on the solenoid, but the indicated North and South poles don’t match ...
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Problem of controlling an solenoid injector using a transistor
I am trying to use a transistor (BJT NPN) to switch a solenoid injector circuit on or off by using a TTL signal as input to the base.
The circuit is shown in the picture. The solenoid takes the ...
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Driving a 9V Normally Open methane gas valve in an atypical situation
I have the following that I would want somehow paired:
A. methane (CH4) gas valve, Normally Open, activated with an impulse of 9V DC at around 1.5A (I measured coil resistance as 6 ohm). Tested with a ...
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Relay kickback causing ESP32 to restart
I have an esp32 connected to a 12V circuit. This circuit is supplied by two 12V lead-acid batteries in parallel. The circuit controls a Solenoid using a 12v double pole, double throw relay. This ...
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What is the best flyback protection circuit for a 12 V / 30 W solenoid driven by 2 kHz PWM when the diode cannot be placed directly across the coil?
I need some help choosing the best flyback protection circuit for an inductive load driven by PWM. I’ll attach a simplified schematic of my circuit along with test results for each protection method I’...
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Flyback diode solution for inductive loads with GND loss and reverse polarity issues
I'm looking for advice on how to properly design a flyback protection circuit on the PCB for an automotive application, where the supply comes from a vehicle battery and the system must handle GND ...
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How to calculate charge time of a solenoid
I am trying to design a very small solenoid with a very fast charge time. Working backwards from a charge time of approximately 500 μs, I want to see if it is possible to create solenoid to meet this ...
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Can a linear voltage regulator such as L7812CV drive a 12 V 350 mA DC solenoid?
I think the answer is "no" because I built the circuit, complete with flyback diode (1N4004) and a "more than 12 V" power supply connected to pins 1-2 of the regulator and I am ...
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Driving a solenoid with correct freewheeling diodes
I plan to drive a solenoid (2 amps) like this, high-side and lo-side required for diagnostic purposes. I am in doubt about over-voltages produced by (across) inductor when both switches becomes off. ...
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Designing a board to actuate a 24VDC solenoid using an MCU
This is a continuation of these two questions:
Designing a PCB to actuate a 24VDC solenoid valve using timer pulses
Using a MCU and PCB to actuate a 24V solenoid
This is a board that will be powered ...
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Eddy current levitating force?
Suppose the RMS value of AC sinewave current current in the coil/solenoid is kept constant,
but the frequency is increasing.
(Might be done perhaps by adjusting the Input Voltage)
What will happen ...
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Using a MCU and PCB to actuate a 24V solenoid
This is my new design using a MCU. To clarify, the previous design was quite messy due to needing a simple one-shot pulse sent to a solenoid, which was then scaled up to what it is, due to continued ...
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