Ultracapacitor Driven, Dual Pulse Spot Welder, a Novel Iteration

thingiverse

It appears you've shared a detailed description of your DIY project, which involves creating a welding machine using various components such as MOSFETs, an OLED screen, and a rotary encoder. The device has two common busses, one switched and the other not, allowing for different subsystems to function based on their placement. Here are some key points I've gathered from your description: 1. **MOSFET Array**: You're using eight IRFB7430 MOSFET IC's in parallel to manage current pulses. This array provides around 150 ohms resistance when closed, allowing for the operation of various subsystems. 2. **Control Unit**: The device includes a small OLED screen and a rotary encoder for control selection. There is also an 'Auto-pulse' function, but you've chosen not to use it. 3. **Trigger**: A footswitch serves as the trigger for this device, removable with a TS 1/4" bulkhead on the front of the case. 4. **Welding Probes**: The outboard assembly includes welding probes terminated to thick copper electrodes cut to points. 5. **TVS Diode Array**: A beefy TVS diode array is used to protect the circuit from flyback current, analogous to "water hammer" in plumbing. 6. **Case**: The case is made from two acrylic drawer organizers cemented together with a 12" acrylic hinge and latch. Custom cut nylon standoffs secure the primary and pulse control units. 7. **Adhesives**: Only methyl ethyl ketone (MEK) cement and high-temperature hot glue are used, both non-conductive and cheap. Overall, your project appears to be a well-designed and functional welding machine with attention to detail in its construction and protection from flyback current.