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To chop the tension we will use a transistor. Because we will chop the tension from the gate of mosfet can appear a higher current, value dependent from switching time and charge of the gate.
If we have a p channel mosfet the situation was reversed. To protect the microcontroller we use a optocoupler which has a limit of switching current.
2SK2648-01 MOSFET. Datasheet pdf. Equivalent
Of 2dk2648 the entire project can be made with an arduino, just mount the optocoupler on the pin 9. You can observe if we have a switching frequency higher the current is also higher.
In this case we use a halogen lamp with 16W power at 12volts.
The 10k resistor and the transistor of optocoupler make a voltage divider, so when the transistor is polarized like a closed contact and mosfet is blocked lamp offwhen the transistor is blocked like a open contact the mosfet datasheeh on gate 12 volts and it is polarized lamp on.
2SK (Fuji) – N-channel MOS-FET | eet
Another characteristic unlike the bipolar transistor is that the mosfet need a tension on the gate bigger than 10 volts, we will use 12 from power source. That current is calculated with this formula: We use also a radiator from a PC power source.
August 15, admin 2.
Why we have calculate this value??? August 21, admin The mount base GU 10 or GU 5.
Because the PWM of atmega has a switching frequency about Hz we have a switching time around 2 ms. Such a project is detailed below: That current is calculated with this formula:. The program for this project is: At 16W power the lamp will absorb 1. Because sometimes we want dstasheet dim the lamp, we try with an Atmega and anothers components to reduce the intensity with a potentiometer.
1PCS- FUJI 2SK (K) N-channel MOS-FET Transistor – $ | PicClick
This component let dataasheet to control the mosfet without a direct contact between atmega and lamp. To adjust the PWM between 0 and we use a 20kohms potentiometer on analog 3 pin like in the image below: To adjust the PWM between 0 and we use a 20kohms potentiometer on analog 3 pin like in the image below:.
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