I bought a Arduino Uno R3 mini computer board and a Oven Reflow Controller from Rocket Stream. This will be heck of learning curve. The electronics is the easy part the programming is another. 35 years ago I tried machine languages when the 8080 CPU serenest. That was along time ago. So any help is appreciated. I will post pics and schematics.
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Re: DIY Preheater and Reflow
Sound pretty interesting! Would be good to see an update.
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Re: DIY Preheater and Reflow
Ordered a heating element from a Milwaukee 8977 heat gun and will use a
ECOPlus 25CFM 110vac 3.5" fan. I am in the parts gathering stage then will go connecting it testing/modifying stage. Will use SSR with optoisolated input to protect the Arduino/Rocket Stream boards. The plan is to have two heating profiles. Downloaded via USB from computer. Preheat and Reflow.
Preheat profile for a 5 degree/sec (2-3C) up to 302F (150C) to heat bottom of board and use my Air heat topside for low melt desolder and solder paste soldering.
Reflow profile a little faster ramp from the 150C point up to 225C Reflow along with topside heat using solder paste. Of cousrse the will be trial and error adjusting the papmeter pracicing on older bad boards.
I have researched this abit, many sites pretty much agree on temp rates and duration of the heat. Once I am happy with the results I will post all parts used along with schematics and programing,
Any help or pointed is appeciated. It will not hurt my feeling.Comment
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Re: DIY Preheater and Reflow
Reflow should reach a bit higher temps at the end of the profile, 230-235C for a very brief period (5-10 seconds max). Preheat to 150C is right.A working TV? How boring!Originally posted by PeteS in CAComment
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Re: DIY Preheater and Reflow
I also have a rocket scream reflow oven controller Arduino shield I've used it a bit, but still looking for the best oven. It works well, but a few quirks:
The thermocouple size/placement is critical, so sensed temperature closely tracks the component/pcb temperature. The MAX31855 is not a great thermocouple chip. It is very sensitive to (common-mode) hum, and RF from cellphones. A burst of RF causes the temperature reading to fluctuate and the reflow software (wrongly) jumps to the next state, as it does not average readings enough. Or the RF noise trips the MAX31855 fault flags (open/shorted thermocouple) and the reflow software gets confused in the middle of a run.
Ground your Arduino (power) to the oven chassis and keep thermocouple wiring away from the heaters and heater wiring. I added some ferrite beads and a common-mode choke which helped a lot. Test by leaving your cordless/cell phone nearby before you do some boards.Comment
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Re: DIY Preheater and Reflow
I am making it after the Zephertronics AirBath. Not a oven but heater fro
The bottom and I have two different hot air units for topography board. I plan to use it mostly for desoldering and soldering chips etc probably very little Reflow .I will probably have some questions to ask you in a few weeks. My Mother is very ill and needs Prayer.Comment
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Hi,
I just got a LeFavor 858 heat gun today. I bought it for re-flowing a 1"x1" chip. I played around with it and find it difficult to get the right flow rate, nozzle size, and temperature for the job.
The main difficulty is not knowing when does the solder melt under the chip. Unlike removing the chip, I cannot keep pushing it until it moves. If it moves, I will never be able to put it back.
Is this the right tool for the job?
I do have an old toaster oven. -
Hello all,
I am experimenting a bit with reflowing larger components - ideally I'd like to reflow a PS4 APU or a GPU for example.
I know it's impossible to reflow such large components with just hot air so I bought a pre-heating plate, T-8280 classic Chinese machine, which seems to be working fine besides it's a little slow, which shouldn't be a big deal.
Now, my hot air station is a Aoyue 852A++ and I feel it's a bit weak when used with larger nozzle. I tried reflowing a laptop chipset using one of those large, rectangular, nozzles and I failed miserably,... -
Mounting and Handling Guidelines for TO220 TO220F TO247 Cases / Packages
The TO220, TO220F and TO247 are the popular packages for power devices because of their versatility and ability to dissipate moderate amounts of heat. This application note describes the basic guidelines for handling power MOSFETs in TO220, TO220 and TO247 packages shown in Figure 1. Please note that only mechanical and soldering guidelines are covered here. Additional precautions are required for isolating high voltage rated devices to meet safety regulations.
Securing a good thermal interface between...10-07-2024, 04:35 AM -
I saw some posts at one point talking about doing a reflow but I couldn't find them again so I thought that I would post this here.
I plan on reflowing the GPU of this old HP DV2500 laptop but I want to go over what I have and the steps I have to take to guarantee it will come out fine.
I have a Yihua 8786D 2in1 Rework station, flux (just some paste that I got from an old Radioshack kit), a couple rolls of Kapton tape and a $15 Thermometer +probe (a TM902C from EMR shielding Solutions if its important).- The paper that came with the thermometer states that the probe
10-10-2024, 02:53 AM -
This is a guide that I am writing for helping others to replace their MEC1503 EC chip if it breaks (or to get around an inconvenient prompt to the BIOS). This forum has been extremely helpful to me so I would like to contribute to help others. I will tell you right now that this task is very difficult to do. You MUST have experience and tools to do precision micro-soldering, BGA reballing, trace repair, and general laptop repair skills.
There are some specialty tools needed to do this task. The replacement MEC1503 chips can be acquired from Aliexpress. Do not buy the bare chips as...
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