Hacking Hardware Picofly - a HWFLY switch modchip

abal1000x

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Thank you for the reply, seems I edited my comment too late. What about the pull-down? Is it needed with fuel mosfet? I didn’t add it on the first mod I performed.
I remember only one person add it, at the first time rehius post the diagram.
I including person who doesn't add.

Without the pull down, you might risk on burning the mosfet. When the mosfet somehow on open state, and the G is disconnected from the pico. But if everything is right, it shouldn't happened.

But reality in life usually odd, the unexpected might happened :D
Just search in this thread someone burn his mosfet.
 
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cgtchy0412

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Any suggestion on any dual channel mosfet, as the possibility of soldering two caps with one mosfet in one go is intriguing enough for me, coz i always avoid using dual mosfet because it needs two separate mosfet.
A few i found at least in my local e-shop is always assimetric one or one with high rdson value.
Ideally it should be dual independent mosfet in one package with rdson < 10 miliohm @4.5v.
 
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Adran_Marit

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Any suggestion on any dual channel mosfet, as the possibility of soldering two caps with one mosfet in one go is intriguing enough for me, coz i always avoid using dual mosfet because it needs two separate mosfet.
A few i found at least in my local e-shop is always assimetric one or one with high rdson value.
Target is should be dual indenpendent mosfet in one package with rdson < 10 microohm.
See the board a page ago
 

CodyRoseman

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Any suggestion on any dual channel mosfet, as the possibility of soldering two caps with one mosfet in one go is intriguing enough for me, coz i always avoid using dual mosfet because it needs two separate mosfet.
A few i found at least in my local e-shop is always assimetric one or one with high rdson value.
Ideally it should be dual independent mosfet in one package with rdson < 10 microohm @4.5v.
the IRFHS8342 has an rdson of ~[email protected] Vgs, you don't need < 10mohm
 

cgtchy0412

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If i put the mosfet outside the shield, and connect it with wire, in your opinion does it still works sir?
Somebody need to test this, how long can a Drain to Caps wire be and still can glitch. Also different wires? Also beware of false positive, when it works on test case but cannot survive long enough cycle.
 

abal1000x

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yes so long

yes, i've had wires about 10cm in length while testing.
Thank you for confimation sir.
This is a great news. So we basically could take that mosfet out from the apu.
I have tried that lot of time, but the glitch doesn't work. Maybe the 8342 is not suited for that.
 

CodyRoseman

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RdsOn too high, as it in single mosfet dont work maybe only AON brand, and cannot test it also as it is not easily found near my location. Will wait for op to test that.
https://www.digikey.my/en/products/detail/texas-instruments/CSD85301Q2/5114820
https://www.lcsc.com/product-detail/MOSFETs_Texas-Instruments-CSD85301Q2_C544396.html
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Thank you for confimation sir.
This is a great news. So we basically could take that mosfet out from the apu.
I have tried that lot of time, but the glitch doesn't work. Maybe the 8342 is not suited for that.
I had dual IRFHS8342 dangling from wires, and they glitched a Mariko
 

lightninjay

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abal1000x

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30 guage, 0.25mm
Your board is unique then.
Every board i meet put the mosfet inside the apu via flex cable or manually.

I have tried using 0.3mm (said the seller on aliexpress), and use 1 mosfet 8342 failed, 1 mosfet IR8342 + 1 mosfet AON6512 failed, 2 mosfet AON6512 failed. The failure is the same which is cyan means the glitch failed. The length is around 10cm, each Drain Source Gate.
 

lightninjay

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Your board is unique then.
Every board i meet put the mosfet inside the apu via flex cable or manually.
TBF, 30awg allows for some pretty decent resistances. (disclaimer, I have been drinking) I did a lot of my very first install with long wiring, and all my glitches were successful with 30awg kynar wire. As long as solid connection is made, and you have good enough resistances to make glitch timings, I cannot see the fault.
 

abal1000x

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TBF, 30awg allows for some pretty decent resistances. (disclaimer, I have been drinking) I did a lot of my very first install with long wiring, and all my glitches were successful with 30awg kynar wire. As long as solid connection is made, and you have good enough resistances to make glitch timings, I cannot see the fault.
Maybe i just got bad luck :mellow:

The ideal is the mosfet outside the apu, together with the picofly board.
So the Gate never disconnected, lowering the probability mosfet got burned.
So the modification inside the apu only put some cable.
If its work, it would be wonderful.
 

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