We mentioned PWM in our previous articles, to summarize briefly; As engine speed control, LED brightness control, PWM appears in many places, in this series we will produce PWM in astable mode with 555 Timer Integrated.
Circuit Elements Used
- 555 Timer
- 1N41141 Diode x2 & BYW98 Diode
- 100nF Capacitor x2
- 47k Ohm Resistance & 10 Ohm Resistance
- Any Power Mosfeti (IRFZ44ES)
- 10k Potencyometer
In this diagram, the value of the keystone poister that constitutes the PWM frequency is the value of the R and C2 capacitor, with a rough calculation we can find the value of this frequency at 1290Hz based on the formula f/(R x C2), producing a square wave whose signal width can be adjusted by a poisterometer in a circuit such as the figure. The PWM signal produced in the 7th leg of the integrated is transmitted to a power mosfetine through 10 ohm resistance. As a result, the lights and motors can be controlled in line with the current of the mosfetin. The mosfet (IRFZ44E) given in the diagram can operate stable under normal conditions without heating up to 3A, it is worth using a refrigerant block for 3A>, the 10 ohm resistance used filters the input capacitance and inductance.
Extra: Burn Led in Astable Mode
You can find our article where we use the 555 Integrated in Astable mode and burn the LED.