Temperature controlled soldering gun with bar graph indication

This soldering station is  designed to control the temperature of soldering gun Solomon SL-1 and other similar soldering devices with integrated thermocouple. DC voltage generated by thermocouple is amplified by operation amplifier CA3140.
The precise regulation and excellent small hysteresis of temperature is obtained by voltage stabiliser LM723M (military packaging). LM723M contains an embedded temperature stable reference voltage source with its own of constant current.
Visual indication of SET or READ temperature is realized by LM3914 and 10 LED bar graph display to represent of temperature range from 50 to 500 degree Celsius.
The electric circuit of soldering iron heater is optical insulated from control electronic circuit by CNY17 optocoupler.
However, this is an accurate device for regulation of your soldering iron and precise indication of the temperature.
I constructed it and I did it. Built it and you, do not wait.
8 years of continuous operation without a single malfunction of the device is sufficient confirmation of its quality.

 

DSC_6616 DSC_6617

DSC_6619 DSC_6621

DSC_6622 DSC_6623

The complete instruction, 3 PCB, schematic diagram et all you can find in EMITER 12/2004, follow the link: http://www.emiter.com.mk/poveke.php?napis_id=1582

 

Author: Primarius D-r Petar Avramovski, MD.

Leave a Reply