# Spot welding machine module, 100A Thyristor, time and current adjustable, with display

> DIY module for spot welding machines with a 100A thyristor and SCR phase control. Uses an STM8 microcontroller and BTA100-800B triac, with a digital display and two 10K potentiometers to set time (1-50 cycles, 1 cycle=20ms) and current (30-99%). Requires a 9-12VAC transformer and a microwave transformer. Package: control module, display module, 4-wire set with DKJ10-25 connector.

- Page: https://sigmanortec.ro/en/spot-welding-machine-module-100a-thyristor-time-and-current-adjustable-with-display
- Price: 108.60 RON
- Availability: In stock; 1-2 zile
- Reference: 9486 · EAN: 5941312968891
- Category: Mechatronics and IoT > Tools > Spot Welders
- Specifications: Nominal Current: 100 A; Current Adjustment: Yes
- Package (shipping data): 0.094 kg
- Updated: 2026-09-23
- Shop: [Sigmanortec.ro](https://sigmanortec.ro/en/llms.txt)
- Prices: RON, VAT included; prices and stock as of 2026-10-22 05:45 (Europe/Bucharest)

## Description

DIY module for spot welding control, precisely regulates time and current through SCR phase shift, displays values on digital display, setting is done quickly from two potentiometers, easy start via external contact for pedal or button, STM8 microcontroller and 100A thyristor for stable control in industrial and electronic applications.
The control module for the spot welding machine made in DIY mode. It controls the welding time and current through SCR phase shift.
The two potentiometers regulate the welding time and current, and these parameters are displayed on the digital display.
Welding is triggered by dedicated pins (closing the circuit) where a mechanical pedal with 2 wires or any kind of accessory that can transmit a closed contact can be attached.
The module uses an STM8 microcontroller.
There are LEDs on the board that indicate power, status, pedal and operation.
Important: To be functional, this module requires a 9 or 12V AC transformer and a microwave transformer. Welding tips are also a necessary item. The main module and the one with the display are connected by wires that can be detached during transport. The order of the wires is marked on PCBs with an asterisk. Check the correctness of the threads before use!
Specifications:
Current: 100A, Thyristor
Supply voltage: Transformer 9-12VAC
Auxiliary item required: Microwave transformer
Microcontroller: STM8
Triac: BTA100-800B
Connector: DKJ10-25, quick connector
Display: Digital Display
Control: Potentiometers 10K
Time: Settable, 1-50 cycle units (1 cycle equals 20ms)
Current: Settable, 30-99%
Dimensions mm main module: 80 x 60mm
Dimensions mm display mode: 35 x 40mm
Content:
1x Control Module
1x Display module with display
1x Set of 4 wires with connector