Electronics > Beginners
How to improve Solenoids open/close response time ?
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tecman:
Bootstrapping and zener are the way to go.  But be aware that with higher switching duty cycles bootstrapping will increase overall solenoid current resulting in higher temps, and will also increase dissipation in the zener.  Be sure to evaluate both.  Higher zener voltage will decrease off times, but the limits are the higher voltages on the rest of the switching components.

Paul
Albatroon:
Wow, A lot of answers. Thank you all guys !
I'll go with Bob's drawings.. Seems that it 'll fit my needs. Specifically the rapid speed operation.
I'll use this circuit


I am using 24v 6.5w solenoids..
What transistors should I use ? Should the 3 transistors rated to this power or only Q3 should be a big one and the others are a small ones ?
If I added the Zener trick to the circuit. Will it help or not ?

By the way, I am driving about 200 solenoids, many times per second.
I started this project back in 2012, I Built this https://youtu.be/YtlYc2bzUEs?t=10.
Now I am trying to build a new one with batter valves, better performance & a Bigger size !
 
Thank you all !


Albatroon:
Anyone ?
soldar:
That schematic does not look right to me. Why did you make changes to the original?
Albatroon:

--- Quote from: soldar on March 16, 2019, 03:45:28 pm ---That schematic does not look right to me. Why did you make changes to the original?

--- End quote ---
Nothing Changed, It's the original schematic from the website
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