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I bought a cheap hot air rework station off eBay. It's a typical "858D" unit made popular by Atten, WEP, YOUYUE, ZENY, and a dozen other brands. However, the one I got is completely unbranded and I didn't trust its construction. Good thing I tore it apart! This is the unit I purchased: http://www.ebay.com/itm/252206984519
Roger explains how to reverse-engineer the ATTEN AT80D solder-station, how the analog circuitry works and how finally to fix the problem with the falsely displayed temperatures. The ATTEN AT80D soldering station has a severe problem with the displayed temperature vs. the measured temperature at the solder-tip. Demonstrated in this video: https://youtu.be/phDOs18MbRs This is because the temperature is measured at the heater-element and not at (or at least near) the solder-tip. So there is a big temeprature-differential due to the thermal resistance between the heater-element and the solder-tip. It could have been easily fixed in software or with the change of a single resistor in the hardware by ATTEN. Furthermore the contact-area between the heater-element and the solder-tip is very small. Thus the thermal-resistance is big and the control-loop for the temperature is not very stable with a big time-lag from switching the heater-element on until the heat has finally reached the solder tip. Download-Link for Schematics & Pictures: https://1drv.ms/u/s!AmW9-q-1GZM1g_YzAfAC5cSTP58FAg
how to repair transformer winding repair mini transformer In the good old times it was a matter of fact that every electronic hobbyist or technician would wind himself any power transformers he needed, and rewind any that burned out. Unfortunately, nowadays transformer winding is fast becoming a lost art, and I have seen many people despair about where to find some very specific transformer, or pull their hair out about the cost of having one professionally wound to specifications. Since I started in electronics, as a 12 year old boy, I have always wound my own transformers. I started using the basic, but useful instructions provided in The Radio Amateur's Handbook of the time, and later I came to better understand how transformers work, which enabled me to optimize a given transformer for the intended application.
I believe I got a faulty unit. The thermister in the soldering iron burned out after about 3 hours of use so I replaced it with the spare and it worked again for about 20 minutes and then that one also went open circuit. The heating element is still good in both but it is the temperature feedback device that has gone bad. This and the displays not showing the real actual temperature makes me think there is a problem with it. Luckily I contacted the eBay seller and told him what happened and he refunded my money in full! Also he doesn't want it sent back so I get to keep the parts! :D Spiyda Design's video of his soldering station with working displays. http://www.youtube.com/watch?v=lYbAMjGqMZY Thank you for watching!
Not convinced? This one is also great: https://goo.gl/4pSrA8 This was long overdue! I am tying up some loose ends from the popular JBC soldering station video. The new design is simpler, cheaper, more efficient and equally powerful. I have learnt a lot about solid state relays in this project and I hope you will too. Schematics and software: https://drive.google.com/file/d/0B6S_PcWWM1YlY1lORkhDcTAzdEU/view?usp=sharing If you are not sure whether you should build this, take a look at http://dangerousprototypes.com/forum/viewtopic.php?f=56&t=7218 That is a well tested, often built and much more universal soldering iron controller than mine.
when carrying out any repairs to an electrical item, ALWAYS unplug the item from the mains, and leave for 10-15 minutes before opening.
there may be dangerous voltages inside even after unplugging.
link for the soldering station.