Futuba Diode

Futuba Diode

Post by Gary & Phila Blayloc » Sun, 29 Aug 1999 04:00:00



I have been thinking about putting a jumper across the diode (in the
charging circuit inside of the transmitter) so I will be able to cycle the
battery without having to remove it. Does any one know if this will cause
any problems? Thanks for any help.
                                                           Gary
 
 
 

Futuba Diode

Post by Don Edber » Sun, 29 Aug 1999 04:00:00



Quote:

> I have been thinking about putting a jumper across the diode (in the
> charging circuit inside of the transmitter) so I will be able to cycle the
> battery without having to remove it. Does any one know if this will cause
> any problems? Thanks for any help.

It won't cause any problems unless you connect a funky charging cord and
allow the ends to short, rapidly discharging the battery and causing a
fire or at least smoke... or you you plug a JR charger into a Futaba
box, or vice versa.

check out Sirius' page on bypassing:
http://www.teleport.com/~sirius/services.htm

don e.
--
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* Don Edberg * Dynamic Modelling * publisher of RC info books *

* Model Airplane News' "Effective Programming" Columnist      *
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Futuba Diode

Post by Mathew R Ha » Mon, 30 Aug 1999 04:00:00


I age with Don, but also don't forget doing that WILL VOID ANY WARRANTY !

Matt


Quote:
> I have been thinking about putting a jumper across the diode (in the
> charging circuit inside of the transmitter) so I will be able to cycle the
> battery without having to remove it. Does any one know if this will cause
> any problems? Thanks for any help.
>                                                            Gary

 
 
 

Futuba Diode

Post by SIMP » Mon, 30 Aug 1999 04:00:00


The diode is to protect the radio circuit from reverse polarity say, wrong
adapter that fits the jack. If you jumper the diode then you stand the risk of
burning your radio if reverse polarity is ever introduced. Can't you just leave
the radio on to drain the battery?

Phillip

 
 
 

Futuba Diode

Post by Steve Swe » Wed, 01 Sep 1999 04:00:00



:>I have been thinking about putting a jumper across the diode (in the
:>charging circuit inside of the transmitter) so I will be able to cycle the
:>battery without having to remove it. Does any one know if this will cause
:>any problems?

Its a blocking Diode, designed to stop current flow 'out' of the TX,
you'l find that you can charge and use simultaneously, but if the
charge source goes short your transmitter wont shut down 'if' the
diode is still in place.

     Regards from STEve & his nice warm cosey PAK'd   MegaSTE.

 *  MegaSTE 40Mhz 68030, 68882 FPU, 4+16 Meg RAM, SCSI II, MV-300  *

 
 
 

Futuba Diode

Post by Karl Sorowk » Fri, 03 Sep 1999 04:00:00


Most of the good trannies will shut down after 30 mins without use.


Quote:
> The diode is to protect the radio circuit from reverse polarity say, wrong
> adapter that fits the jack. If you jumper the diode then you stand the
risk of
> burning your radio if reverse polarity is ever introduced. Can't you just
leave
> the radio on to drain the battery?

> Phillip

 
 
 

Futuba Diode

Post by Chuck » Fri, 03 Sep 1999 04:00:00


I use a 2amp pico fuse to jump the diodes in my radios.  if there is a short or
something goes wrong the fuse will blow.  Only had it happen once with a bad
charging cord.  the fuse popped and the diode protection was restored.  A pico
fuse is about the size of a small resistor and can be found a Radio shack or an
electronics store.  It is the best way to go for safety reasons.

Quote:

>> I have been thinking about putting a jumper across the diode (in the
>> charging circuit inside of the transmitter) so I will be able to cycle the
>> battery without having to remove it. Does any one know if this will cause
>> any problems? Thanks for any help.

>It won't cause any problems unless you connect a funky charging cord and
>allow the ends to short, rapidly discharging the battery and causing a
>fire or at least smoke... or you you plug a JR charger into a Futaba
>box, or vice versa.

Chuck K.
From South Philadelphia PA.

 
 
 

Futuba Diode

Post by Ron » Sat, 04 Sep 1999 04:00:00


The fuse across the diode may offer protection if the charging cord is short
circuit, but I think that you may still have a problem if a reverse voltage
is ever applied to the charging jack. I believe that if you short circuit
the diode that is in series with your charging circuit, then you should
install a diode across the charging jack with the cathode connected to the
positive side. Adding a fuse to the input will then give you full protection
against the short circuit of the attached charging cable, and also the
unlikely event of reverse polarity being applied to the charging jack.

Just my two cents worth (at the price of a transmitter it is worth ensuring
good protection).

Ron.