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11-10-2017 09:09 PM  29 months ago
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870heli

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Monson Ma. USA

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JR 783 Battery
I picked up a New 783 just for fun. I need a battery for it. Can you use a lypo or life in these old radios? Just wondering before I buy something like an old NiCad. Yuk LOL
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11-10-2017 11:18 PM  29 months ago
EEngineer

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TX

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What is the voltage that was used on that radio?

Knowing that, you could perhaps select another type of battery.
Logo 600SXs, 800XX, TDR IIs
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11-11-2017 01:28 AM  29 months ago
870heli

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Monson Ma. USA

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It was a 4x4x AAA NiCad setup. I think they called it 9volts. A three cell lypo would be 11.1 volt. Hobby King has battery's that size I just don't know if that's too high a voltage.
I found a older battery from a DX-7 but the plug was different than the JR. I wasn't expecting that.
I didn't get the battery with the radio so I am not sure of the connector.
I hope it works when I find a battery. It was suppose to be new unused.
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11-11-2017 02:19 AM  29 months ago
R/C Speed Nut

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Galesburg, Michigan USA

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http://www.hangtimes.com/txpacks.html
You will need to choose the JR Black T connector.

If you decide to go with a lithium battery, with a three cell lipo the voltage is a little too high and can overheat the regulator in the transmitter, unless you add a resistor in line to reduce the voltage. You could go with a three cell li-fe, it has a lower voltage (9.9v) and would be good for your application.
Which ever lithium you choose you would need to locate an old style JR Black T connector and solder it on.

Mike

Funky Chicken?!!..........I thought this was how you do a piro flip!!
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11-11-2017 04:40 AM  29 months ago
EEngineer

rrProfessor

TX

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Not sure what 4x4x means....except NiCad and you mention 9V.

An "D", "C", "A", "AA", "AAA" alkaline battery's voltage is 1.5V per cell.

So, if you mean 8....then 8 x 1.5V = 12V nominal

A NiCad cell is 1.2V....

So, 8 x 1.2V = 9.6V nominal.

Within your TX's internal power distribution circuitry, is a "regulator"....which "buffers" the TX circuitry from the variance of the battery voltage during its discharge from usage.....

Keep the plug of your TX's original battery pack.....you will need that to use as an adapter plug for the new battery pack that you're going to use on this TX....as you will simply cut of the plug of the new battery pack and solder on the plug of the original battery pack....to make it plug and play(or is that plug and pray.....LOL).

You could use another 8 cell NiCad pack...and use the original TX connector plug......if it fits in your TX, that would be best....
Logo 600SXs, 800XX, TDR IIs
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11-11-2017 12:12 PM  28 months ago
870heli

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Monson Ma. USA

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Thanks and yes I did mean 8 cell NiCad pack. So 9.6 would be what was in it. That is what I think as the TX did not have a battery in it. I guess I will be looking for that black JR connector.
It sounds like a life three call would work without a regulator.
I just wanted to have it be old school but can use current equ. if this becomes to involved.
Thanks
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11-15-2017 03:53 PM  28 months ago
870heli

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Monson Ma. USA

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Battery's America had what I needed in stock so I am all set.
Just hope the radio works. LOL
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