So if i want to run a 7.4 v for my nitro i need to use a voltage dropper. So what about new digital servos if they are good to 8.4v i dont need the voltage dropper or do I. Also does the 7.4 volts increase the speed of the servo. Just some questions and can i get it in a term that i can understand. So maybe avoid this topic TOM....lol just kidding tomas no im not
Is a "voltage dropper" in your terms Gerry, cause I have never heard that term used before....lol....The servo go f a s t with more v o l t a g e ...do you understand??...
The 7.4 volts might be too much for your receiver. However, if your servo is rated for the higher voltage, by all means, go for it. The higher voltage will mean there's more power available, which will allow for both a quicker transit time and higher torque than you're used to.
So, you would disconnect the red wire from the 3-wire plug that goes from the servo into the receiver. You would connect this after your on/off switch, but before a BEC, which is just a couple diodes (or a regulator if you want to get super fancy, but this is un-necessary) which drops the voltage to a nicer range for your receiver. This might be un-necessary, but better safe than sorry.
You can see in this extremely crude schematic. The servo is in the upper right. It has three wires -- the white is the signal, the black is negative, and both of these are in the connector that goes to the receiver. The red wire is removed from the receiver connector, and goes before the dropping diodes.
(http://abc123.dowco.com/~tom/irocc/bec.png)
If you're not using a regulating device now, then there's no point in adding one, and you'll get no gains doing this.
The diodes in the above schematic are doing the exact same thing as your voltage dropper, so you can substitute your voltage dropper for the diodes.
Does this make sense?
Acouple of other options are to get a proper 7.4V servo (hitec and Airtronics both sell them). Or you could use a LiFE rx pack (they are 6.6V).
Airtronics and spektrum both say there recievers are good until 20V.
Shawn.
I havent had a problem running my airtronics servo in my pancar thats 5 or 6 years old on 7.4v so why would it be an issue.Or is that due to the esc bringing the volts down. Or am i just lucky i havent melted it yet
hey what is the torgue and speed that we want for 1/12 scale
Quote from: gotnitro on September 03, 2009, 04:02:40 PM
I havent had a problem running my airtronics servo in my pancar thats 5 or 6 years old on 7.4v so why would it be an issue.Or is that due to the esc bringing the volts down. Or am i just lucky i havent melted it yet
Gerry, your ESC has a BEC circuit which takes the 7.4V and steps it down to 6.0V (I think). That way your receiver, servos, and transponder see only 6.0V.
Blake
Quote from: Shawn68z on September 03, 2009, 05:50:04 AMAirtronics and spektrum both say there recievers are good until 20V.
What about a personal transponder?
MTX Transponders:
Operating voltage: 2.8V - 30V DC
AMB Transponders:
Operating Voltage: 4V-8Vdc (10ma current)