PWM with 555
 |
One of the method of speed control is PWM or pulse width
modulation. Pulse width modulation is the process of
switching the
power to a device on and off at a given frequency, with varying on and
off times. This circuit can be used to control the speed of a motor
by
adjusting the duty cycle of the pulses sent to the motor. |
R1
| 2k2 |
R2
| 2k2 |
R3
| 10 |
R4
| 100k |
RV1
| 1M |
| |
| |
|
| C1 |
1500pF |
| C2 |
47nF |
| C3 |
100uF/25 |
| C4 |
100nF |
| C5 |
470nF |
|
|
|
|
|
| U1 |
LM555 |
| Q1 |
MTP3055 |
| D1 |
1N4158 |
| D2 |
1N4158 |
| D3 |
1N4007 |
| D4 |
BY255 |
| D5 |
By255 |
|
Copyright C 2009 | Design of William Puentes
