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2.4G Spektrum Radios Spektrum 2.4 Gigahertz Radios and Technology


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Old 10-21-2007, 07:30 PM   #1 (permalink)
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Default Light for DX7

I have been thinking about adding an LED light to the DX7 radio so I will be able to see the TX is on at a glance like all of the other radios I have ever owned.... Has anyone done this or know how to do it???
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Old 10-21-2007, 07:49 PM   #2 (permalink)
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i also need a bright *** LED for mine today is the third time i have got in my truck only to hear the faint beep of a dead DX7
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Old 10-21-2007, 08:32 PM   #3 (permalink)
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I could use one myself........someone on here must know how to do this and is willing to explain to the rest of us...perferably with pictures...
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Old 10-21-2007, 09:35 PM   #4 (permalink)
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i can do it. i will break out my digital camera and show everyone how?

Where do YOU want the LED at?
PM me, or post here. let me know.
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Old 10-22-2007, 01:57 PM   #5 (permalink)
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Just use a Infina-Ion battery and you can leave it on even longer, 15 to 16 or more hours. LOL
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Old 10-22-2007, 04:08 PM   #6 (permalink)
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Quote:
Originally Posted by SB View Post
i can do it. i will break out my digital camera and show everyone how?

Where do YOU want the LED at?
PM me, or post here. let me know.
I figure up top by the flight mode switch or on top in front of the antenna would be the easiest place to put one?
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Old 10-22-2007, 06:50 PM   #7 (permalink)
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Quote:
Originally Posted by PTFlyer View Post
I figure up top by the flight mode switch or on top in front of the antenna would be the easiest place to put one?
I was thinking of that or modifying the whole radio and moving the neck strap point below the switch and put the led where it used to be.

just a thought. i'll start on it later tonight to find a good point to solder in to.
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Old 10-22-2007, 07:10 PM   #8 (permalink)
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Quote:
Originally Posted by SB View Post
I was thinking of that or modifying the whole radio and moving the neck strap point below the switch and put the led where it used to be.

just a thought. i'll start on it later tonight to find a good point to solder in to.
Ticidytoc already did that mod......

See "Finless" post on this forum
https://www.helifreak.com/showthread.php?t=33828&page=2

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Old 10-22-2007, 07:30 PM   #9 (permalink)
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Quote:
Originally Posted by ChasHeliCop View Post
Tickitytoc already did that mod......

See "Finless" post on this forum
https://www.helifreak.com/showthread.php?t=33828&page=2
Perfect. thats the first part.
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Old 10-22-2007, 07:42 PM   #10 (permalink)
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The LED is where the old strap ring used to be.
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Old 10-22-2007, 08:13 PM   #11 (permalink)
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oh there is an led there. lol (i feel dumb)
i looked over the post. i don't see any of the wireing on there
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Old 10-22-2007, 08:32 PM   #12 (permalink)
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I don't think he did a picture build.... or at least I haven't found it.
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Old 10-22-2007, 08:42 PM   #13 (permalink)
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ok. i'll work on that then.

and it dosen't mater where everyone wants the led. you can put it anywhere your heart desires. i just want mine there.

but i'll show everyone where to hook to
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Old 10-22-2007, 08:54 PM   #14 (permalink)
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Quote:
Originally Posted by SB View Post
ok. i'll work on that then.

and it dosen't mater where everyone wants the led. you can put it anywhere your heart desires. i just want mine there.

but i'll show everyone where to hook to
Yes..please do....some of us don't know where or how to go about hooking up the LED without burning it out, or which led ...

I looked at the Ratshack led's

I was thinking of using one of these because it's easy tro get:
http://www.radioshack.com/product/in...entPage=search

but it says:

Typical Voltage is 2.1, with a maximum voltage of 2.8V

so I have no clue how to go about hooking it up/ or even where to hook it up...or even if I can even use that one or if there is some other led I should be using for this....

So please post what you come up with.....thanks..
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Old 10-22-2007, 09:25 PM   #15 (permalink)
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Quote:
Originally Posted by PTFlyer View Post
Typical Voltage is 2.1, with a maximum voltage of 2.8V
For an LED the voltage is sort of a non-issue. The ticket is to control the current. Typically you'll find LED's that run anywhere from 10 to 100 mA. Based on this you can just run the LED in series with a resistor and through the on-off switch. Use this equation to figure out which resistor:

V = I x R

Where:

V is the voltage. In this case you'll be plenty close if you use your battery voltage - 2.0 for the drop in the LED (or probably fine even if you just take the battery voltage)

I is the current. 100 mA would be 0.1 (always compute it in amps)

R is the value of the resistor in ohms

Generally speaking LED's accept a wider range of current than the spec lists. If you over-drive them it will shorten their life, but if it's within any sort of reason they'll still outlast your radio.

Also, you can take a file and remove the dome on the end of the LED. This will make the light pattern far less directional. So you can see it from almost any angle without being blinded by it when looking straight on. If it's too bright, just use a resistor with a higher ohm rating. You can't overdo it with too much resistance - only too little.

But I'm rambling. SB will probably post the exact LED and resistor values that are easy to find and are suitable.

Incidentally the LED you linked to would work fine. Just use it with a resistor anywhere in the 500 ohm range. If it's not bright enough for you, you'll want to pick an LED that accepts a higher current (and use a lower value resistor). For that LED:
http://www.radioshack.com/product/in...entPage=search
5 for .99
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Old 10-22-2007, 10:20 PM   #16 (permalink)
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thanks spork.......that's the info I need although I'm electroniclly challanged and would still be guessing if I worked out the math correctly even with the formula........

but let me get this part straight at least....

if I go with the led I linked and use one of those resistors, that you linked ,in line (On the + side of the LED I guess? or would it bridge the +/- leads?) and wire it to the switch I should be all set to go?...given the power at the switch is +/-11.~V
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Old 10-22-2007, 10:33 PM   #17 (permalink)
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Quote:
Originally Posted by PTFlyer View Post
if I go with the led I linked and use one of those resistors, that you linked ,in line (On the + side of the LED I guess? or would it bridge the +/- leads?) and wire it to the switch I should be all set to go?...given the power at the switch is +/-11.~V
Yup. You just put the LED in line with the resistor.

(+11V)--------(resistor)-------(LED)----------(-)

If you can forgive my awful ASCII graphics. If you hook the LED up one way it will light. The other way it will do nothing (but it won't hurt anything).

I assume the on-off switch will give you battery voltage, but I haven't ever been inside a DX7.

P.S. Just to avoid confusion, this doesn't go across the on-off switch. one end goes to the on-off switch and the other end goes to the (-) side of the battery.
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Old 10-23-2007, 12:22 AM   #18 (permalink)
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graphics I get!.......

I understand that the + goes to the "on" side of the switch and the - goes to the - side of battery...

I'll check the Voltage at the switch before I wire anything up just to be sure it's got battery voltage....

thanks again.....I'll give it a try tomorrow if I can find the time to get to RS for the parts.....


one more question.can the resistor be wrapped it shrink wrap or does it get hot and need to "vent"..and just shrink the leads to aviod a short?

thanks again for your help...
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Old 10-23-2007, 12:50 AM   #19 (permalink)
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Let me know when you guys decide to do a backlit LCD screen
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Old 10-23-2007, 01:04 AM   #20 (permalink)
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Quote:
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one more question.can the resistor be wrapped it shrink wrap or does it get hot and need to "vent"..and just shrink the leads to aviod a short?
Heat shrink probably wouldn't do any harm, but I personally wouldn't cover the resistor. The part I mentioned is a 1/4 watt resistor, and you'll be running in the 1/4 watt range, so I'd let it keep cool personally.
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