Electronics > Beginners
Glue gun mod...
nznative:
Hi all. My first post here....
This is a pic of my 18v cordless hot glue gun. It runs at a temp of around 190 degrees centigrade but the material I work with is quite sensitive to those high temps so I have purchased some low temp glue sticks and need to lower the running temp of the gun down to about 120 degrees centigrade. I have run a few tests with a few resistors but it seems my calculations were iut and I did not end up getting the results I had hoped for.
Can anybody offer me any suggestions. Thanks in advance...
[emoji1417][emoji1417][emoji1417]
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garethw:
Hello,
I would start by measuring the resistance of the heating element with it disconnected. Then I would measure the voltage across the heater during normal operation. Does the IC shown in the first image cycle the heater on and off or does it use PWM to control the temperature.
ogden:
I would suggest to NOT dissipate extra heat in the resistors, no matter where you put them. You shall investigate possibility of hacking regulator PCB. It does not seem to be complex. Please show close-up pictures of PCB (front and back). Also try to invest some time to reverse-engineer it's schematics.
Mechatrommer:
yes unnecessary waste of battery energy. if the board in the pic is pwm or buck converter, then maybe you can tweak that to lower output voltage. if not, maybe you can trash that and replace with buck module such as 10ยข click this or better.
Zero999:
It might not even use a temperature controller. Glue guns often have a PTC element which is self-regulating. It draws a high current, until it reaches a temperature set by the characteristics of the elemnent material itself, then the current falls and it draws the right amount of power to keep itself at that temperature.
If this is the case, there are two ways to accurately reduce the temperature:
1) replace the element
2) add a temperature controller with a temperature sensor.
#1 is probably not viable, as it's unlikely you'll be able to find the correct element and could be expensive.
#2 is more doable but not easy.
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