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OK
You are right
But when the transistor start to round
It is current is 50mA
Added after 6 minutes:
but it is not in saturation condition
and it is in hfe condition
I think
what is your opponion?
First I must tell that the current for dc motor in direct use in 5V is 100mA and the hfe for BD135 in 100mA is ~ 55
100 /55 ~= 1.8 mA
and the Ic can supply this current and no nead for darlington
Ib*hfe=Ic
Ib base current
Ic collector current
Added after 2 minutes:
and the PIC can supply 1.8 mA
I found it!!!
the key is that we must use capacitor
parallely with dc motor
and IT WORK WITH EVERY FREQUENCE
I use 100uF capacitor paralelly with dc motor
and it work without nead of diod!!!
tanks All
I am sorry.
I make mistake.
It is worked well by changing the frequency of
motor
& i changed the program
to the following code
void main() {
TRISB=0;
while(1){
PORTB=0XFF;
Delay_us(800);
PORTB=0;
Delay_ms(2);
}
}
and it work well without diod
It...
I use
Added after 3 minutes:
I use two diode and simulate the circuit in proteus
in proteus it work well but in real it first round with periodical speed and after some second it round fast
and after some second stop
I dont know why?
this is the circuit i use
Added after 11 minutes:
I...
Hi all
I use bd135 to drive a dc motor with pic microcontroler
I use dc motopr with LED parallely.
It work fine with LED but
when i use it with a dc motor the led period change
and after some second the Led turn off and dc motor stop working
I use following program
compiler is...
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