AlainB
Member
Hi,
My parallel port output 4,8 volts. For instance, if I want to use a TIP121 for driving a stepper motor, I will put a 1K resistor betwen the base and the computer pin. Not because I know what I am doing, just beacause I saw it somewhere. If I don't put any resistor, it will work the same anyway.
Both ways could be good or bad, I don,t know.
Could you explain what is needed to calculate the right resistor values for any transistors used that way. I am looking for values for hard switching application only. If this information is needed, the transistors would be used as power stage for a 5,2 volts 1,4 amp. unipolar stepper motor
Here are 2 datasheets.
TIP121:
https://www.ortodoxism.ro/datasheets/stmicroelectronics/4128.pdf
BUL45:
www.onsemi.com/pub_link/Collateral/BUL45-D.PDF
Where is the informations needed on those datasheets?
Thanks for any help.
Alain
My parallel port output 4,8 volts. For instance, if I want to use a TIP121 for driving a stepper motor, I will put a 1K resistor betwen the base and the computer pin. Not because I know what I am doing, just beacause I saw it somewhere. If I don't put any resistor, it will work the same anyway.
Both ways could be good or bad, I don,t know.
Could you explain what is needed to calculate the right resistor values for any transistors used that way. I am looking for values for hard switching application only. If this information is needed, the transistors would be used as power stage for a 5,2 volts 1,4 amp. unipolar stepper motor
Here are 2 datasheets.
TIP121:
https://www.ortodoxism.ro/datasheets/stmicroelectronics/4128.pdf
BUL45:
www.onsemi.com/pub_link/Collateral/BUL45-D.PDF
Where is the informations needed on those datasheets?
Thanks for any help.
Alain