Que_Trac1
Newbie level 4
tip120 h bridge
Hi everyone,
I brought a robot kit called Asuro at Jameco. I need to modify the kit with a better microcontroller and better motors. I got the kit working with the new microcontroller, but I can't seem to know how to modify the H-Bridge for the better motors to have more current. The bipolar used in the kit maximum Ic is 0.5A. There is not enough current to make the robot move. I need around 1.5A current going through it. I tried to look for bipolar transistors with a higher maximum Ic at Jameco, so I pick out MJE172 and BD237. It doesn't work. After researching more on bipolar, I know that I need to look not only at Ic max, but also hFE and Ib max, etc. The datasheet for those components doesn't tell me what I need. Without them, I can't determine the appropriate rb to use. Overwhelming with all those information and uncertain whether I am doing is correct or not, I don't know what transistor to choose and what else I need I change. May you guys help me out?
Hi everyone,
I brought a robot kit called Asuro at Jameco. I need to modify the kit with a better microcontroller and better motors. I got the kit working with the new microcontroller, but I can't seem to know how to modify the H-Bridge for the better motors to have more current. The bipolar used in the kit maximum Ic is 0.5A. There is not enough current to make the robot move. I need around 1.5A current going through it. I tried to look for bipolar transistors with a higher maximum Ic at Jameco, so I pick out MJE172 and BD237. It doesn't work. After researching more on bipolar, I know that I need to look not only at Ic max, but also hFE and Ib max, etc. The datasheet for those components doesn't tell me what I need. Without them, I can't determine the appropriate rb to use. Overwhelming with all those information and uncertain whether I am doing is correct or not, I don't know what transistor to choose and what else I need I change. May you guys help me out?