Battery Spot Welder (CD Welder) DIY or Buy
video description
Charging a capacitor (like 10mF 30V) with a 30V 5A lab power supply and then discharge it with a mosfet (3 200A) in very short pulses. You could controlle your mosfet with a pulse width signal and charge another capacitor (like 2. 7V 500F) with it. Now you should have a more continuous flow of current if you attach a load to it. And you could set the voltage to a fixed point with the PWM signal to have like 1V and 150A. (I dont know if this works just an Idea for making a high amp power supply correct me if i'm wrong)
Date: 2020-09-05
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Comments and reviews: 9
furonwarrior
All of this. and I all I did was soldering two copper ends for contact on the 400F capacitor and a JST connector for charging. I got a step-down voltage converter that allows me to plug this into a USB power supply and charged it all the way up to 2. 7V. The current dropped as the capacitor became full and it worked perfectly as the project was simple. I'm gonna make a 2S lithium ion battery for 37 minute flight time for my airplane. Thanks Scott for your wonderful videos as complex and knowledgeable as they are.
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All of this. and I all I did was soldering two copper ends for contact on the 400F capacitor and a JST connector for charging. I got a step-down voltage converter that allows me to plug this into a USB power supply and charged it all the way up to 2. 7V. The current dropped as the capacitor became full and it worked perfectly as the project was simple. I'm gonna make a 2S lithium ion battery for 37 minute flight time for my airplane. Thanks Scott for your wonderful videos as complex and knowledgeable as they are.
reply
Michael
Why setup the supercaps in series for 15V? Since what we are after is resistance welding from the joule heating effect, we need amperage. Most spot welders I have seen operate at around 2V. This reduction in voltage would simplify many aspects of the project such as voltage sensing for the uC, charging circuit, etc.
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Why setup the supercaps in series for 15V? Since what we are after is resistance welding from the joule heating effect, we need amperage. Most spot welders I have seen operate at around 2V. This reduction in voltage would simplify many aspects of the project such as voltage sensing for the uC, charging circuit, etc.
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Green
First of all Why do you need a controller? Why don't you have a button but when you don't press it, it charges and when you push it stops charging and let's you discharge?
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First of all Why do you need a controller? Why don't you have a button but when you don't press it, it charges and when you push it stops charging and let's you discharge?
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errand
hi sir. I would appreciate if you can spot weld a new battery pack for my icom 02AT fm transceiver. either 8 or 10 1. 2volts rechargeable battery. I will buy from you
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hi sir. I would appreciate if you can spot weld a new battery pack for my icom 02AT fm transceiver. either 8 or 10 1. 2volts rechargeable battery. I will buy from you
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Christoph
Try a Lithium Titanate Battery 30-40Ah with a Supercap and just two copper electrodes: -) pretty basic but works fine. (seen at a German DIY Chanel)
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Try a Lithium Titanate Battery 30-40Ah with a Supercap and just two copper electrodes: -) pretty basic but works fine. (seen at a German DIY Chanel)
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FrostyCoug
If you used more flux in liquid form, your soldering would go a lot easier. Flux would be all over the board, but it could be washed.
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If you used more flux in liquid form, your soldering would go a lot easier. Flux would be all over the board, but it could be washed.
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Jake
When I clicked this I thought you were making a spot welder powered by batteries not a spot welder that you use to weld batteries together
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When I clicked this I thought you were making a spot welder powered by batteries not a spot welder that you use to weld batteries together
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Motion
Maybe for the next time you can try high amperage an low voltage, so you create a high temperature point for low time. Maybe I'm wrong.
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Maybe for the next time you can try high amperage an low voltage, so you create a high temperature point for low time. Maybe I'm wrong.
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Kristian
Even though you have the KWeld by now. Why dont you take your microwave transformer and switch it for a short amount of time?
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Even though you have the KWeld by now. Why dont you take your microwave transformer and switch it for a short amount of time?
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