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Adaptador de corriente alterna magnético de segunda generación para productos MacBook, lanzado por primera vez en 2012. No es compatible con sistemas de generaciones anteriores Disponible en versiones de 45W, 60W y 85W.

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Hack magsafe 2 to use as generic PSU

Hi,

I. have an 85W Magsafe 2, which had the cable damaged.

As I don’t need it to power a mac, would it be possible to use it as a bench power supply?

Measuring the voltage with no load, shows 3V on my multimeter. How can I make it work? I read somewhere that it needs to see 40kohm, to activate.

I’ve tried to put a 40kohm resistor there and it doesn’t wake up to max voltage.

Cheers,

Pedro

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It’s not designed to be a generic power supply. Its circuitry is designed to charge a Li-Ion battery that’s it.

A bench power supply needs the ability to select a voltage and control the current draw. Without that you risk damaging the device if over powered.

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Thanks Dan.

What if I want to use it as an USB-C charger for my phone/tablet. Is that possible?

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@pcardoso73 - Sorry Apples charging system is unique to them.

One of the biggest benefits of the USB-C standards effort was to define a charging standard.

The Apple MagSafe charger won't offer the needed connections and the temperature feedback system which uses a one wire conn connection won't work within the USB-C device.

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@pcardoso73 sure you can. You just have to be careful and follow instructions like this. One of the issues that I see coming at you, is something like this “with no load, shows 3V” which should not even be there.

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@oldturkey03 - This is not something I would recommend.

Besides I doubt Pedro is advanced enough to get this deep and likely doesn't have the rest of what's needed and lastly a cracked open charger is not very safe!

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@danj I am not going to guess the skill level of @pcardoso73 but it can be done. It is not the design of the Magsafe that would be an issue. @pcardoso73 can check the video and see if that is what he wants to do and only he knows his comfort level when it comes to a project like this.

So yes, it CAN be done.

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40k ohm resistor in how many watt?

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Pedro Cardoso estará eternamente agradecido.
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