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| Soldering station Quicko T12-943 no power |
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| Haggis McHaggis:
--- Quote from: Specmaster on May 23, 2019, 05:43:43 pm ---(not too sure why you opened another thread for this) --- End quote --- This is not my thread, draza opened this topic and posted about it in my thread. :) These topics are related to some degree. I've no idea why draza is not attending anymore. Would be intresting to hear what the problem was and what can be done to prevent it. What i want to do is preparing everything before going to use the station in the best possible way and learn something about grounding/ESD. |
| Specmaster:
--- Quote from: Haggis McHaggis on May 23, 2019, 05:59:44 pm --- --- Quote from: Specmaster on May 23, 2019, 05:43:43 pm ---(not too sure why you opened another thread for this) --- End quote --- This is not my thread, draza opened this topic and posted about it in my thread. :) These topics are related to some degree. I've no idea why draza is not attending anymore. Would be intresting to hear what the problem was and what can be done to prevent it. What i want to do is preparing everything before going to use the station in the best possible way and learn something about grounding/ESD. --- End quote --- In that case I apologise, I never spotted that the OP were two different members but still firmly believe that the solution to one is the same for other as it only seems to the 943 variant that has these issues, in view 952 is the way to go. |
| Haggis McHaggis:
--- Quote from: Specmaster on May 23, 2019, 06:05:56 pm --- --- Quote from: Haggis McHaggis on May 23, 2019, 05:59:44 pm --- --- Quote from: Specmaster on May 23, 2019, 05:43:43 pm ---(not too sure why you opened another thread for this) --- End quote --- This is not my thread, draza opened this topic and posted about it in my thread. :) These topics are related to some degree. I've no idea why draza is not attending anymore. Would be intresting to hear what the problem was and what can be done to prevent it. What i want to do is preparing everything before going to use the station in the best possible way and learn something about grounding/ESD. --- End quote --- In that case I apologise, I never spotted that the OP were two different members but still firmly believe that the solution to one is the same for other as it only seems to the 943 variant that has these issues, in view 952 is the way to go. --- End quote --- Don't apologise. I'm thankful you and other participate and offer help for beginners like me. I'm already in the process of ordering a second station, but not sure i should get the 951 (LED) or 952 (OLED) version. I think the LED version could be enough, but who knows. Nevertheless i want to use the station i already have and want to understand the best grounding method. I wasn't aware that these laptop psus are bad or cheaply designed. They cost a fortune after all. |
| Haggis McHaggis:
--- Quote from: floobydust on May 23, 2019, 05:59:04 pm ---We don't know what Quicko T12-943 parts are failing, draza did not mention. Let's assume it is sensitive to overvoltage transients on DC power. The DC on/off switch would cause a power on spike and is trouble. Consider: LT AN88 Ceramic Input Capacitors Can Cause Overvoltage Transients for detailed analysis and notice the spikes can approach 41Vpk. --- End quote --- Thanks for the document. I overflew it, but unfortunately it's beyond my skills to design a solution from it. The 1.5KE27A you mentioned is probably more realisitic for me. But even with the diode i struggle to choose the right part. I can't interpret the datasheet properly. I think i need a uni-directional type. Would the 1.5KE22A or 1.5KE24A be the right part for this application? My psu is 20VDC. |
| floobydust:
You want a TVS that does nothing at 20V (or 24V) yet clamps below the point of damage to the controller. SMD marking code SYTB I couldn't find, it might be an LM2841 max. 45V input. So a 22A or 27A TVS is OK. Notice app. note 88 also shows adding a bulk capacitance 47uF 35V works very well. I would put in both the TVS and capacitor, like this schematic. The Quicko "STM32 T12" controller, I notice the ads on Ali are no longer showing this controller in the T12-943 stations. It seems to be replaced by the "T12-952 STC OLED" which is back to using a linear voltage reg. |
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