HackoBoy Posted October 25, 2014 Report Share Posted October 25, 2014 hello First, I apologize that my English is not very good and at times I use google translator :) But most of them understand wordsI decided to buy a soldering station, but those who themselves control the temperature sensor and heater use - were quite expensive in my city. After reading information on the internet - I saw that they are working on 24 volts. I had an old transformer - which I rewound the throttle from a street lamp - and has output parameters: no load at the output 25.4V After turning on the car lamp series connect 40 watts + 45 watts = voltage is 23.4 volts - the current in the lamp is 3.8A. Once convinced that the transformer does not hum and gives a current that I need - I decided to use it. Maybe the voltage is slightly below the required 24 volts, but it will do the jobI liked the controller Hakko 936 - that no digital thermometer for temperature visualization. After I saw pdf - I thought it might add thermometer. Give advice if possible.schemes applied to the controller which costs $ 13http://www.mmccs.com/mmarc/n0ss/hakko_936_schem-pcb_%26_mod_v1r7.pdfAfter the thermocouple - signal is amplified by IC2D and IC2A and feed triac driver -> IC1 turning the triac. Something like a comparator - am I right or not ? If I take the amplified signal from the thermocouple by foot "pin4 IC1" if there will be a disruption in the operation of the scheme. I found two schemes thermometer - but if you can give me a better option.1: http://vrtp.ru/index.php?act=categories&CODE=article&article=21372: http://www.299792458.ru/news/2010-02-28-14 translate from RUS to ENG1: https://translate.google.bg/translate?hl=bg&sl=ru&tl=en&u=http%3A%2F%2Fvrtp.ru%2Findex.php%3Fact%3Dcategories%26CODE%3Darticle%26article%3D21372:https://translate.google.bg/translate?sl=auto&tl=en&js=y&prev=_t&hl=bg&ie=UTF-8&u=http%3A%2F%2Fwww.299792458.ru%2Fnews%2F2010-02-28-14&edit-text=But if you can offer me icl7107 scheme to 500 degrees Celsius - I would be grateful Quote Link to comment Share on other sites More sharing options...
HackoBoy Posted October 30, 2014 Author Report Share Posted October 30, 2014 hello I found a circuit filled with ICL7107 and 3 1/2 7seg led display After simulation in the program " Proteus 8 professional " - i see the circuit work well . After simulation in Multisim scheme soldering station controller -> It see - out from IC2C - Vref that about 500mV and the output from IC2B - voltage varies - from 213mv to 500 mv . when i build in box - i upload pics . :) Quote Link to comment Share on other sites More sharing options...
HackoBoy Posted December 1, 2014 Author Report Share Posted December 1, 2014 In test this transformer give :Without load - 24 volts.50 watts under load - voltage drop of 23 volts85 watts under load - voltage drop of 22 voltsThe stand of the soldering iron was not very stable - - one time is fixed and sometimes not :)after few hour the end result satisfies me 100%. And later i will add digital thermometer and will fit bottom the key -> information about the current temperature - information coming from the sensor heaterI apologize for the quality of the photos - and if someone does not like manufacturing. But I'm satisfied. Quote Link to comment Share on other sites More sharing options...
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