Relay replacement

225

04:29:33

This battery driven circuit replaces a shitty wastefull relay. It consumes around 1000 times less energy than the relay, so it is defently worth building when you are working with batteries. 

The signal you apply at the BJT can be up to around 1V low, but make sure, the MOSFETS are fully opened, else they might start a fire. 

And dont listen to Hurz with his diode shit. Parallel diodes to the MOSFETs are not necessary, but not harmfull eigher.

published 7 years ago

lenzrulz

7 years ago

Thank you for sharing...👍🏻

walkemm

7 years ago

yes ... you are actually an amateur in circuitry. Your scheme is just nonsense, no words. I will you try to read "The Art of Circuit Engineering", i will you practice with examples, and make circuits. Good luck!

LeButch

7 years ago

This is a working, energy efficient circuit. What is the problem with it?!

Robert_Kidd

7 years ago

What you don’t have here is the certain isolation that a relay gives.

LeButch

7 years ago

That is correct. I really dont like to work at house voltage with semiconductors, but with a relay, the batteries wont last for 2 month...

Robert_Kidd

7 years ago

Yes, I understand why you don’t want relays 😀

ViolationMad

7 years ago

I would go through the pain of using optocoplers. Especially to protect the battery if you're still using it.

LeButch

7 years ago

Why?

hurz

7 years ago

If this is a fully isolated design, a plastic box and no metal screws to outside, then there is absolut no need for optocoupler! If you intertact with an external system, computer or a different second circuit its a must to use optocoupler or any galvanic separation. 4.8V gate voltage gives me the indication the mosfets are the wrongs ones for this project. The autor unfortunately havn't said anything about used material. The autor even missed to tell us what load he is driving, we have to speculated. Everything else, what is importante about this circuit, was already said.

ViolationMad

7 years ago

But at one point the battery will have to be recharged. So you either take it out or but a charing circuit in. I think that's enough interaction to consider optocouplers.

LeButch

7 years ago

@VM If I used optocouplers, I had to use another voltage source. @Hurz I am using 2N60C MOSFETs and I am switching a 4W LED lamp. I also used a boost converter, cause my battery pack only gives 3.2 volts. I step the voltage up to 6V.

hurz

7 years ago

@ViolationMad, this is also something what the auto left open. I guess he is using batteries and has to replace them every few weeks.

LeButch

7 years ago

We will see how long they live.

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