renegat
Newbie level 3
![Newbie level 3](/styles/images/ranks/alevel3.gif)
lpt motor control
LPT pin produces 4,4V. I don't know how many mili-ampers it will give me with 1kohm resistor... but i know that not much.
I want to control by lpt pin motor of a toy. To do so i must use external power source. I want use 3 batteries that will produce 4,5V.
Lpt pin number 2 will control transistor. The pin will be attached to the base of npn transistor bc237.
Lpt pin gives 4,4V at '1' logic, and 0,9V at '0'. Now there's a problem, because as much as i know transistor doesn't work only below 0,7V. I don't know which resistor i should connect to the base, so the valtage would drop to the (i don't know 0.5V?).
LPT pin produces 4,4V. I don't know how many mili-ampers it will give me with 1kohm resistor... but i know that not much.
I want to control by lpt pin motor of a toy. To do so i must use external power source. I want use 3 batteries that will produce 4,5V.
Lpt pin number 2 will control transistor. The pin will be attached to the base of npn transistor bc237.
Lpt pin gives 4,4V at '1' logic, and 0,9V at '0'. Now there's a problem, because as much as i know transistor doesn't work only below 0,7V. I don't know which resistor i should connect to the base, so the valtage would drop to the (i don't know 0.5V?).