Reverse Current Protection Mod for 9xtreme

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bob195558
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Reverse Current Protection Mod for 9xtreme

Post by bob195558 »

9xtreme Reverse Current Protection Mod
Hi,
Before the 9Xtreme Upgrade Board for the 9x radios arrives,
I will do the Reverse Current Protection Mod on the 9x Main Switch Board.
9x Switch Board_a.jpg
Cut Track and add SS34 Vishay DIODE SCHOTTKY 40V 3A SMC (http://www.ebay.com/itm/20PCS-SS34-Vish ... 2a5236986c)
9x Switch Board_f.jpg
MikeB wrote:The 9Xtreme has a processor controlled power switch for the Tx modules, so on the 9Xtreme, they will be protected by the single diode.
If doing this mod, I would suggest removing the 5V regulator on the switch board at the same time, it isn't needed anymore.
Mike.
(viewtopic.php?f=95&t=7182&start=270#p101974)
Mike, What do you suggest, that I should do to (disconnect CJ78L05) removing the 5V regulator on the Switch Board ?
9x Switch Board_c.jpg
If you have SHUTTING DOWN screen message see: (viewtopic.php?f=126&t=7828&p=103935#p103847).
See here for other 9Xtreme information: (viewtopic.php?f=95&t=7182).

Bob B.
Last edited by bob195558 on Thu Feb 04, 2016 4:42 pm, edited 3 times in total.
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Re: Reverse Current Protection Mod for 9xtreme

Post by MikeB »

That's what I did. Since I was modifying the backboard I chose to remove the transistor and the buzzer as well!

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Re: Reverse Current Protection Mod for 9xtreme

Post by bob195558 »

Hi Mike,
Should I then just unsolder and remove the 5V regulator (CJ78L05), Transistor (SC8050 D331)
and the Buzzer from the 9x Switch Board ? :)

I am not modifying the backboard.

Bob B.
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Re: Reverse Current Protection Mod for 9xtreme

Post by jhsa »

yes.. And you can also remove/unsolder the transistor near the buzzer..

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Re: Reverse Current Protection Mod for 9xtreme

Post by andrewju »

What about using a P-channel MOSFET instead of a diode?

Image

Voltage drop should be much lower - which may be good if one is using a 2S battery...

(I used a similar solution in the 'PowerSound' module - and it works good)

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Re: Reverse Current Protection Mod for 9xtreme

Post by MikeB »

That's a useful circuit, but not needed in this case. The soft power switch, which uses a similar reverse current protection circuit, shorts out the diode, so in normal use there is no voltage drop across the diode.

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Re: Reverse Current Protection Mod for 9xtreme

Post by andrewju »

Ah, right! Understood.
Thanks!
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Re: Reverse Current Protection Mod for 9xtreme

Post by bob195558 »

I have unsoldered/removed three components:
Regulator, Transistor, Buzzer and also I removed the old Antenna Contact Bracket.
Switch Board removed Components.jpg
Switch Board removed Components_b.jpg
Next to cut the track I used a Dremel to grind it away.
Switch Board removed Components_c.jpg
Soldered SS34 Vishay Diode Schottky 40V 3A SMC to Switch Board.
Diode soldered to Switch Board_a.jpg
Next to reassemble Modified Switch Board to confirm 9x radio still is working properly.

Bob B.
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Re: Reverse Current Protection Mod for 9xtreme

Post by bob195558 »

Problem ! :( :o :shock:
After mod NO screen.jpg
No Screen at all now.
Radio seem to be powering up and screen has a quick flash of light.
No back light and no screen there is a beep from the transmitter.
Was working before.

Bob B.
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Re: Reverse Current Protection Mod for 9xtreme

Post by jhsa »

The beep is probably from the RF module at power ON?

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Re: Reverse Current Protection Mod for 9xtreme

Post by MikeB »

Double check the diode is the correct way round, and is fully connected to the two pins (switch and connector).

It may be worth a check with the diode shorted out to see if the radio starts then.

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Re: Reverse Current Protection Mod for 9xtreme

Post by bob195558 »

I jumper around the diode and radio now powers up.
I checked another diode on the bench and I do have the diode in backward.
So I need to turn the diode around.

Update: bad diode had to use a different one.

Bob B.
Last edited by bob195558 on Wed Oct 28, 2015 4:08 pm, edited 1 time in total.
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Re: Reverse Current Protection Mod for 9xtreme

Post by bob195558 »

I reversed the diode and it still dose Not work ! :o
SS34 Vishay DIODE SCHOTTKY 40V 3A SMC (http://www.ebay.com/itm/20PCS-SS34-Vish ... rmvSB=true)

Bob B.
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Re: Reverse Current Protection Mod for 9xtreme

Post by jhsa »

Test the diode with a multimeter. Maybe it is open circuit..

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Re: Reverse Current Protection Mod for 9xtreme

Post by MikeB »

I'll try to do the mod myself this evening.

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Re: Reverse Current Protection Mod for 9xtreme

Post by bob195558 »

Multimeter set to 2X OHM, 2nd diode reads: .539

There may have been a problem with the 1st diode because it is reading .265

Maybe I should turn the second diode around.

Bob B.
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Re: Reverse Current Protection Mod for 9xtreme

Post by bob195558 »

I turned the 2nd diode around like I had the 1st diode and Now it is working properly ! :D
Working 9Xtreme upgraded radio_c.jpg
The first diode must have been a bad one.

My first 9Xtreme installation: (viewtopic.php?f=126&t=7718&start=90#p103320).

Thank you Mike and João ! :D

Added João's Videos Jan. 31, 2016: Safe Power Switch: (https://www.youtube.com/watch?v=qzIZSg5U_6w)
and Safe Power Switch Battery Reversal: (https://www.youtube.com/watch?v=eFM2aSYPYYQ).

Bob B.
Last edited by bob195558 on Sun Jan 31, 2016 10:08 pm, edited 4 times in total.
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Re: Reverse Current Protection Mod for 9xtreme

Post by jhsa »

Good that is working.. ;) :)

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Re: Reverse Current Protection Mod for 9xtreme

Post by LTMNO »

Just received my 9xtreme.. i will be doing this shortly as well.. thanks for the posting...
Custom 9x with M64/Telemetry Mod
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Re: Reverse Current Protection Mod for 9xtreme

Post by KAL »

While still waiting for my boards (even snails seem to be quicker than our customs :cry: )
I do prepair my 9Xs for them.

So I did the current protection mod with an alternative diode, the 1N5822.

Here 2 pictures that show how it can be installed:
(Also you see here an easy way to get rid of the buzzer and it's surroundings ... :mrgreen: )
WP_20151106_15_02_27_Pro (Groß).jpg
the cut track is clear to see...
WP_20151106_14_57_21_Pro (Groß).jpg
The piece of isolation I strongly recommend ...

... next step is to put a drop of hot glue between diode and PCB ...

Klaus
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Re: Reverse Current Protection Mod for 9xtreme

Post by jhsa »

You had no mercy cutting that board :mrgreen:
I do think that the other screw add a little more support when operating the switch.

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Re: Reverse Current Protection Mod for 9xtreme

Post by KAL »

There now resides a rotary encoder ...
WP_20151106_16_32_41_Pro (Groß).jpg
WP_20151106_16_32_12_Pro (Groß).jpg
I'm no friend of this centered neck strap supports.

This is my prefered solution:
WP_20151106_16_38_40_Pro (Groß).jpg
WP_20151106_16_38_26_Pro (Groß).jpg
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Re: Reverse Current Protection Mod for 9xtreme

Post by jhsa »

Ahhhh, you're not a thumb flyer :) That explains everything :mrgreen:

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Re: Reverse Current Protection Mod for 9xtreme

Post by s_mack »

I can't picture it. What are the skis for?
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Re: Reverse Current Protection Mod for 9xtreme

Post by KAL »

Are you kidding me? :D ;)
ABBC3_SPOILER_SHOW
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Re: Reverse Current Protection Mod for 9xtreme

Post by jhsa »

Is the tray riveted to the radio?? :o
Can't see very well on the pictures..

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Re: Reverse Current Protection Mod for 9xtreme

Post by KAL »

Just a 3 mm screw and some washers ...
WP_20151106_19_44_48_Pro (Klein).jpg
WP_20151106_19_44_35_Pro (Klein).jpg
and yes, it's not built for blacksmiths ... :mrgreen:
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Re: Reverse Current Protection Mod for 9xtreme

Post by jhsa »

definitely not :)

This is my tray for the 9x :)

viewtopic.php?f=48&t=1454

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Re: Reverse Current Protection Mod for 9xtreme

Post by bob195558 »

Hi Klaus,
Sorry, but I am not able to see how the aluminum out riggers added to 9X radio with the strap are attached to a person for usage ? :?:
:)

Bob B.
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Re: Reverse Current Protection Mod for 9xtreme

Post by KAL »

In absence of a helper for taking a picture ...
WP_20151106_21_06_49_Pro (Mittel).jpg
( TH9X / 9XTreme / FrSky DHT / Spektrum / Multi / RotEnc )
( 9XR PRO / erSKY9x  / FrSky DHT / Spektrum / Multi / RotEnc / P3 as Slider )

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