Electronics > Beginners
How to improve Solenoids open/close response time ?
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Albatroon:

--- Quote from: ebastler on March 16, 2019, 11:10:31 pm ---Obviously, solid-state water valves are hard to come by, so solenoids it is...  ;)
How long do they typically last in this application?

--- End quote ---

Thank you, solenoids are working great since 2012.. The only problem i faced with my PCB designs, I had 24 pcs of 595's exploded on me :D
It was a wrong design and I overloaded the ULN2803A chips, one of them burnt and 24v return on Negative, all board destroyed :D
Other than, Valves are working good till now..
Albatroon:

--- Quote from: Zero999 on March 16, 2019, 11:01:22 pm ---The inductor represents the solenoid of course.

--- End quote ---

Will this circuit work If i changed the Transistors with Darlington transistors ?
My solenoid are working on 24v, ~0.4A I need a bigger transistors to drive them.
And if it possible, Should I change the 3 or only q2 ?

And What software you used for this simulation ?

Thank you
Zero999:

--- Quote from: Albatroon on March 16, 2019, 11:36:30 pm ---
--- Quote from: Zero999 on March 16, 2019, 11:01:22 pm ---The inductor represents the solenoid of course.

--- End quote ---

Will this circuit work If i changed the Transistors with Darlington transistors ?
My solenoid are working on 24v, ~0.4A I need a bigger transistors to drive them.

And What software you used for this simulation ?

Thank you

--- End quote ---
Why do you think you need bigger transistors?

The BC337 is rated to 800mA, double the current rating of your solenoids,
https://www.onsemi.com/pub/Collateral/BC337-D.PDF

Darlington transistors will work in the circuit, but they have a much higher saturation voltage. Even the circuit I posted with no modifications will drop less voltage than the same one with Darlington pairs.

I used LTSpice to simulate the circuit. Some say it has a steep learning curve, but I found it fairly straightforward.
Albatroon:

--- Quote from: Zero999 on March 17, 2019, 12:04:16 am ---Why do you think you need bigger transistors?

The BC337 is rated to 800mA, double the current rating of your solenoids,
https://www.onsemi.com/pub/Collateral/BC337-D.PDF

Darlington transistors will work in the circuit, but they have a much higher saturation voltage. Even the circuit I posted with no modifications will drop less voltage than the same one with Darlington pairs.

I used LTSpice to simulate the circuit. Some say it has a steep learning curve, but I found it fairly straightforward.

--- End quote ---

I'll try this software, Looks simple!
What Zener should I use ? Any one would work ? Should I get a big one, Like 1w zener ? or anything will work ?

Thank u
Teledog:
Perhaps I've missed something..but  how about sealed SSRs?
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