Jel | Shema Svarochnyj Apparat

: This is the "brain" of the machine. It uses high-speed transistors (typically IGBT or MOSFET ) to switch the DC current back into high-frequency AC (usually between 20–100 kHz). This high frequency allows the use of much smaller, lighter transformers.

Advanced "JEL" style schematics often include specific modules to stabilize the arc: jel shema svarochnyj apparat

: Short circuits in the input or output rectifiers can lead to a machine that powers on but produces no arc. : This is the "brain" of the machine

: Reduces the voltage while significantly increasing the amperage to the levels required for welding. : The incoming 220V AC power is first

: The IGBT or MOSFET tubes are under high stress and are often the first components to burn out.

: The incoming 220V AC power is first converted to DC using a diode bridge and large capacitors (often rated at 400V or more to handle surges).