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bkdavy

Help identify receiver specs

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Can anyone help me identify this receiver's specifications? Specifically, I'm trying to determine the max and min power voltages to determine whether I need to go through the trouble of adding a voltage regulator to my battery, or if I can just hook the battery up directly. The battery I have is a 14.8v 4 cell LiPo that has over 16 volts when fully charged. The reciever input is simply labeled 12v, but I know that many of these recievers simply incorporate and LM7805 or similar voltage regulator, which is good for up to 24 volts.

Thanks for any help.

Brad

post-5-1186587088_thumb.jpg

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Looks like the item RangeVideo sell.

As you say, the regulator should be able to handle the volts, it's the power dissipation that will be the problem; these 2.4GHz receivers draw about 250-300mA, and most of this is needed at about 5v, and the regulators are often not very heavily heatsunk (sic). Lots of volts dropped = things overheat.

You would be wise to put in an external dropper resistor (ohm's law: R = I X V

I = 0.25A

V = battery voltage - minimum voltage for receiver, probably 9-11v)

or use an external regulator (on a heatsink) to keep the input volts down.

Irritating, I know, one day everything will have a built-in SMPS regulator for 1-10 LiPos....

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Thanks for the response. As I continued my searching, I did find one reference to a web page where someone had opened it up and added aluminum blocks to the existing regulators to assist cooling.

I've decided to simply use an external LM7812 ($1.59 at Radio Shack). I've got plenty of capacitors lying around the shop. 5 minutes worth of solder and shrink wrap is easier than overheating the receiver.

Brad

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Good idea! You'd probably get away with bolting the 7812 to the outside of the receiver case, if you can bear to drill it...

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