Thank you guys for your answers. From youre debate I understand some important things.
1. A DC power supply is fine for this job. This is verry good because I can use my 12VAC transformer whith a voltage regulator and a NPN current booster. If i use a ajustable voltage regulator, the problem of dimming is resolved. Please corect me if I am wrong.
Question: In my knowlege, 24VDC is not equivalent whith 24VAC. What is the equivalent DC power for my iron specification.
2. This thread is a backup solution because I dont know if my project for a temperature controller will be a succes. This is my first major project.
I orderred (today or tomorrow is delivery)this iron.
This tipe of iron (24VAC, 48W, 2A) is sell as a spare part for a astronomical priced soldering station and have an integrated thermocouple. I intend to make a controller whith UAA1016 and a triac for this iron and save money.
In UAA2016 datasheet is a simple circuit for this, but this circuit is designed for NTC tipe sensor.
http://www.onsemi.com/pub/Collateral/UAA2016-D.PDF
I find on net this circuits related to a homemade soldering station:
This is the tested schematic for a NTC tipe sensor:
http://tinypic.com/view/?pic=ekm6mv
And this is the adaptation for a K thermocouple tipe iron made by same person and tested whith succes by others:
http://tinypic.com/view/?pic=ekm6o4
My schematic is the combination of these
...but I'm not sure if everything is correct conected. If you guys wiew any errors please corect me. I repeat: this is my first major electronic project.
I dont know the wattage for resistors. This iron comes in 2 diferent models, whith 2 specification for K thermocouple (7-8 mV at soldering themperature and 20-25 mV) , so require an adaptation of opamp resistors.
So guys, if enybody is interested or want to help a novice....
1. A DC power supply is fine for this job. This is verry good because I can use my 12VAC transformer whith a voltage regulator and a NPN current booster. If i use a ajustable voltage regulator, the problem of dimming is resolved. Please corect me if I am wrong.
Question: In my knowlege, 24VDC is not equivalent whith 24VAC. What is the equivalent DC power for my iron specification.
2. This thread is a backup solution because I dont know if my project for a temperature controller will be a succes. This is my first major project.
I orderred (today or tomorrow is delivery)this iron.
This tipe of iron (24VAC, 48W, 2A) is sell as a spare part for a astronomical priced soldering station and have an integrated thermocouple. I intend to make a controller whith UAA1016 and a triac for this iron and save money.
In UAA2016 datasheet is a simple circuit for this, but this circuit is designed for NTC tipe sensor.
http://www.onsemi.com/pub/Collateral/UAA2016-D.PDF
I find on net this circuits related to a homemade soldering station:
This is the tested schematic for a NTC tipe sensor:
http://tinypic.com/view/?pic=ekm6mv
And this is the adaptation for a K thermocouple tipe iron made by same person and tested whith succes by others:
http://tinypic.com/view/?pic=ekm6o4
My schematic is the combination of these
...but I'm not sure if everything is correct conected. If you guys wiew any errors please corect me. I repeat: this is my first major electronic project.
I dont know the wattage for resistors. This iron comes in 2 diferent models, whith 2 specification for K thermocouple (7-8 mV at soldering themperature and 20-25 mV) , so require an adaptation of opamp resistors.
So guys, if enybody is interested or want to help a novice....
