| Electronics > Projects, Designs, and Technical Stuff |
| My constant current load - 90W , 3A 30V |
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| Spikee:
I just made another video , the opamp problem is fixed . In some weird way mu arduino mega is getting reasonably hot. I might have to investigate that. I just went around town to find a new lead acid or gel battery but i coulden't find one anywhere ... so i will have to wait until the weekend so i can take the one i have home to my dorms . I also ordered a 0.1 ohm 100w resistor for low voltage , high current testing. |
| Spikee:
It has been a while but i'm still buzy testing the current load. All my gel / lead batteries are dead so i bought a second hand Delta Elektronika M5-10 (5V - 10A ) power supply. In my youtube video i demonstrate the impact of a higher load resistance vs a lower one. In particular i test 1 ohm versus 0.1 ohm 100W resistor. I test the load on 10A 5V and at the end you see a connector melting because of the current. Youtube link: If you like my videos just Comment , rate and subscribe . Also a thumbs up really helps! ;) |
| mazurov:
JDB: I made a circuit from your model and it works very well! |
| mazurov:
Here's the circuit heating up old Pentium Pro heatsink. Holds 1.9A current within several milliamps from cold start at RT to ~60C. |
| Jay_Diddy_B:
Hi, Here are some pictures of the load that I made. As shown the load is good for about 10W. This can be increased to 30W with a bigger heatsink and a fan. For higher power I would suggest using the Master/Slave configuration. I found a small load like this to be useful when testing multiple output power supplies. Outside view: Inside view: Board top side: Board solder side: Board Design: Regards Jay_Diddy_B |
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