Reverse Current Protection Mod for 9xtreme

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bob195558
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Reverse Current Protection Mod for 9xtreme

Post by bob195558 » Wed Oct 21, 2015 12:08 am

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.
ErSky9x on Taranis, Sky9x, 9Xtreme, Er9x on 9x with Smartieparts Programmer with TelemetrEZ Board
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Re: Reverse Current Protection Mod for 9xtreme

Post by MikeB » Wed Oct 21, 2015 8:50 am

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 » Wed Oct 21, 2015 9:39 am

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.
ErSky9x on Taranis, Sky9x, 9Xtreme, Er9x on 9x with Smartieparts Programmer with TelemetrEZ Board
(http://openrcforums.com/forum/viewtopic.php?f=95&t=7182).
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Re: Reverse Current Protection Mod for 9xtreme

Post by jhsa » Wed Oct 21, 2015 9:40 am

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 » Wed Oct 21, 2015 10:41 am

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 » Wed Oct 21, 2015 10:53 am

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 » Wed Oct 21, 2015 10:59 am

Ah, right! Understood.
Thanks!

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Re: Reverse Current Protection Mod for 9xtreme

Post by bob195558 » Wed Oct 21, 2015 1:42 pm

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.
ErSky9x on Taranis, Sky9x, 9Xtreme, Er9x on 9x with Smartieparts Programmer with TelemetrEZ Board
(http://openrcforums.com/forum/viewtopic.php?f=95&t=7182).
CR10 3D Printer: (http://openrcforums.com/forum/viewtopic.php?f=85&t=10702)

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Re: Reverse Current Protection Mod for 9xtreme

Post by bob195558 » Wed Oct 21, 2015 2:41 pm

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.
ErSky9x on Taranis, Sky9x, 9Xtreme, Er9x on 9x with Smartieparts Programmer with TelemetrEZ Board
(http://openrcforums.com/forum/viewtopic.php?f=95&t=7182).
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Re: Reverse Current Protection Mod for 9xtreme

Post by jhsa » Wed Oct 21, 2015 2:54 pm

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 » Wed Oct 21, 2015 3:22 pm

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.

Mike.
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Re: Reverse Current Protection Mod for 9xtreme

Post by bob195558 » Wed Oct 21, 2015 3:55 pm

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.
ErSky9x on Taranis, Sky9x, 9Xtreme, Er9x on 9x with Smartieparts Programmer with TelemetrEZ Board
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Re: Reverse Current Protection Mod for 9xtreme

Post by bob195558 » Wed Oct 21, 2015 5:10 pm

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.
ErSky9x on Taranis, Sky9x, 9Xtreme, Er9x on 9x with Smartieparts Programmer with TelemetrEZ Board
(http://openrcforums.com/forum/viewtopic.php?f=95&t=7182).
CR10 3D Printer: (http://openrcforums.com/forum/viewtopic.php?f=85&t=10702)

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Re: Reverse Current Protection Mod for 9xtreme

Post by jhsa » Wed Oct 21, 2015 5:14 pm

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 » Wed Oct 21, 2015 5:24 pm

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

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Re: Reverse Current Protection Mod for 9xtreme

Post by bob195558 » Wed Oct 21, 2015 5:46 pm

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.
ErSky9x on Taranis, Sky9x, 9Xtreme, Er9x on 9x with Smartieparts Programmer with TelemetrEZ Board
(http://openrcforums.com/forum/viewtopic.php?f=95&t=7182).
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Re: Reverse Current Protection Mod for 9xtreme

Post by bob195558 » Wed Oct 21, 2015 6:00 pm

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 » Wed Oct 21, 2015 6:14 pm

Good that is working.. ;) :)

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Re: Reverse Current Protection Mod for 9xtreme

Post by LTMNO » Thu Oct 22, 2015 9:33 pm

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 » Fri Nov 06, 2015 2:34 pm

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 » Fri Nov 06, 2015 2:51 pm

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

João
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Re: Reverse Current Protection Mod for 9xtreme

Post by KAL » Fri Nov 06, 2015 3:48 pm

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 » Fri Nov 06, 2015 4:39 pm

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 » Fri Nov 06, 2015 5:59 pm

I can't picture it. What are the skis for?

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Re: Reverse Current Protection Mod for 9xtreme

Post by KAL » Fri Nov 06, 2015 6:38 pm

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

Post by jhsa » Fri Nov 06, 2015 6:41 pm

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

João
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Re: Reverse Current Protection Mod for 9xtreme

Post by KAL » Fri Nov 06, 2015 6:43 pm

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 » Fri Nov 06, 2015 7:56 pm

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 » Fri Nov 06, 2015 7:58 pm

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.
ErSky9x on Taranis, Sky9x, 9Xtreme, Er9x on 9x with Smartieparts Programmer with TelemetrEZ Board
(http://openrcforums.com/forum/viewtopic.php?f=95&t=7182).
CR10 3D Printer: (http://openrcforums.com/forum/viewtopic.php?f=85&t=10702)

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Re: Reverse Current Protection Mod for 9xtreme

Post by KAL » Fri Nov 06, 2015 8:13 pm

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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