The whole purpose of R2, in my opinion, is to limit the gate current to the SCRs when the foot pedal is at its minimum resistance.
@tanky321
Can you tell me what those circled number in schematic represents?
Therefore, the circuit resistance to just barely trigger the SCR is 1405 ohms.
tanky321 said:I came across a circuit online to vary the 220V input into a welder. This is done to control the amount of current entering the piece being welded, using a foot pedal. The circuit has worked for many people.
I built the circuit, but it doesnt work. R2 blew when I would crank the pot up, and there was no current entering the welder. I dont know if the SCR fired or not, but it wouldnt weld or make a spark what so ever.
My initial thoughts are that the circuit was designed for a particular type of SCR, and mine isnt compatible.
Also, im an EE student but im just starting out, I have some circuit theory under my belt, but im not sure on how to tackle this problem.
Can anyone help me out?
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