| 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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