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Because sometimes we darasheet to dim the lamp, we try with an Atmega and anothers components to reduce the intensity with a potentiometer. To chop the tension we will use a transistor.

Such a project is detailed below: In this case we use a halogen lamp with 16W power at 12volts. The mount base GU 10 or GU 5. Of course you can buy it but why not to make yourself one as you like homemade and have the satisfaction that you made something by yourself.

(PDF) 2SK2648 Datasheet download

We use also a radiator from a PC power source. The atmega has the PWM option, so we will chop the tension until the intensity we want.

August 21, admin 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 receive on gate 12 volts 2sk248 it is polarized lamp on. Currently you have JavaScript disabled.


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August 15, admin 2. February 26, admin 5. 2sk2468 16W power the lamp will absorb 1. Because the PWM of atmega has a switching frequency about Hz we have a switching time around 2 ms.

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.

This component let us to control the mosfet without a datsaheet contact between atmega and lamp.

2SK2648 Datasheet

If you like the article click the follow button from social media to stay in touch with us! This control is made by light and protect the atmega from 2dk2648 defect in the part of mosfet. That current is calculated with this formula:. If we have a p channel mosfet the situation was reversed.

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In order to post comments, please make sure JavaScript and Cookies are enabled, and reload the page. An article about Atmega sandalone you have here. To protect the microcontroller we use a optocoupler ddatasheet has a limit of switching current. The wiring diagram is below: To adjust the PWM between 0 and we use a 20kohms potentiometer on analog 3 pin like in the image datashete Why we have calculate this value???


Click here for instructions on how to enable JavaScript in your browser. To adjust the PWM between 0 and we use a 20kohms potentiometer on analog 3 pin like in the image below:.

Of course 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 2ek2648 the current is also higher.

The program for this project is: 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.

That current is calculated with this formula:

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