Pulse discharge micro-spot welder

Probably you’ve noticed sparks when discharging capacitors. The bigger cap the bigger spark. The only problem is that once you short it it runs out of juices splashing around. But what if adding some control to this process – you get different behavior. Radu Motisan has been working on interesting project where he uses capacitors to store energy for his micro-spot welder. The idea is pretty simple – an AVR microcontroller controls discharge amount and timing and this way it is possible either to cut or solder thin metal plates. The project is still in progress with lots of ambitions. So far he is able to cut cans and foils using one mode and solder to foils together in another. He stores energy in to 1.6F capacitor used in car audio systems. Test results looks promising and hopefully we will see finished toy pretty soon. Continue reading