A compact PCB hot plate for soldering and reflowing PCBs with solder paste
What is it?
A compact temperature-controlled PCB hot plate for soldering and reflowing PCBs with solder paste
Why did you make it?
I wanted to get started with reflow soldering and join the surface m…
A compact temperature-controlled PCB hot plate for soldering and reflowing PCBs with solder paste
Why did you make it?
I wanted to get started with reflow soldering and join the surface mount technology squad without needing a bulky reflow oven or modified hot plate.
What makes it special?
It's the least bulky way possible to reflow, and it won't damage your electronic components like hot air might. It has two reflow profiles and a choice between 6 different temperatures. It's an open-source hardware project. It is optimized for low-temperature soldering paste. Bring your own 12V/5A power supply with barrel plug. It's like the movie Inception, except a PCB can reflow a PCB can reflow a PCB...
Feature list
PCB size 100x100mm, heat plate size 81x69mm
DC barrel plug (5.5x2.5mm), runs with 12V/5A (at least 5A) power supply
inrush current limiter to protect power supply when capacitors are discharged
input power filter for smooth current draw
capacitor discharging resistors
ATMEGA4809 microcontroller, can be re-programmed via UPDI header
high power NMOS with gate driver circuit
flyback diode connected to the heat plate
AMS1117 LDO
additional diodes for protection
dual OMRON raised buttons
power LED
0.91" OLED display
LMT85 analog temperature sensor as main sensor
Includes:
What you see in the photo
Code is pre-programmed
1 3-pin header that can be push-fit into the UPDI holes for reprogramming
1 optional high-temperature diode that can be soldered on to support 24V power supplies (unsolder the old one at D2, make sure the line is in the same direction)
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1
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(4.00)
Documentation:
(3.00)
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Bryan |
July 13, 2023
Product looks well developed.
Nice design, I have not tested its operation yet. I understand it probably needs further improvements in its electrical design and firmware. Durability might be questionable on how long the PCB lasts after several cycles of use. I would agree that separating the control section from the heating plate would be a good improvement. There are film heating elements that could be used instead of using PCB traces. I have one such heating element that is sandwiched between two thin aluminum plates which is controlled by a temperature controller and thermocouple. Problem with mine is it does not get hot enough. It uses 115 Vac for the heating element.
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