Hello. Sorry my english if I make mistakes.
I´m going to build a spotwelder. I have removed the secondary of a MOT wit 2 turns of thick copper wire and works great. I controll it with a foot pedal.
Now I want to put a timer to control the duration of the weld. So with a potentiometer I can activate the welder for example 0,1 sec no matter how long I press the pedal. I have though abput using a ponteiometer a capacitor and a transistor that control a small relay and that relay goes to a big power relay that sends the current to the primary of the MOT. But I have 3 questions:
a) I have no idea about the desing of the circuit of the timer hahaha.
b) What are the tipical times for a spotwelder? I mean if for example they are between 0,1 and 0,8 secs, to make the timer with that range.
c) Should I choose a special relay to feed the 220 AC to the transformer since is a coil? I remember taht coils give big sparks when you cut the current, so maybe I´ll nedd that.
Thank you
Best regards
I´m going to build a spotwelder. I have removed the secondary of a MOT wit 2 turns of thick copper wire and works great. I controll it with a foot pedal.
Now I want to put a timer to control the duration of the weld. So with a potentiometer I can activate the welder for example 0,1 sec no matter how long I press the pedal. I have though abput using a ponteiometer a capacitor and a transistor that control a small relay and that relay goes to a big power relay that sends the current to the primary of the MOT. But I have 3 questions:
a) I have no idea about the desing of the circuit of the timer hahaha.
b) What are the tipical times for a spotwelder? I mean if for example they are between 0,1 and 0,8 secs, to make the timer with that range.
c) Should I choose a special relay to feed the 220 AC to the transformer since is a coil? I remember taht coils give big sparks when you cut the current, so maybe I´ll nedd that.
Thank you
Best regards