tiranno
08-09-2007, 05:35 PM
Hi
As it is obvious that I am a noob and a bit scrared of connecting all the electrics.
Is there a schematic and some info on extra comonents required to make it as safe as possible without risking burnouts.
What voltage reducers need to be used (ratings ?W). or do we use any?
I am not sure as to how the receiver gets its power from the pack.
I am no electronics wizz, so please help me. I am nearly ready to install the receiver and the connections.
Many hands make lights work!!
thanks
stevehonn
08-09-2007, 05:55 PM
It depends upon where your power is coming from, if you have an electric heli the speed controller may power the receiver and servos through it's connection to the receiver, this is generally for smaller helis using not more than 3S lipo packs for the main battery, although there are exceptions. You need to knwo the BEC output of the speed controller as most are around 4.8-5V but some are 6V, 4.8-5V needs no further voltage reducers in the system but a 6V output is usually too much for fast digital tail servos, Futaba 9251, 9254 etc. and a step down voltage reducer is required in the lead from the servo to the gyro. The traditional way is to use a seperate receiver battery, usually a 4 cell nicad or nimh pack, connected via a switch connected into the battery connection on the receiver, no other voltage regulators should be required.
To slighty(!) complicate matters there is a very strong move to lipo/lion battery packs, the difference is that the batteries cells output a higher voltage so its usual to see a 2 cell lithium polymer pack used with a regulator, probably the most common is that provided with the Trex 600E (wrongly called a BEC!) This reduces the input voltage down to 5.8V and connects direct into the receiver pack. General consensus is that it's safe to use any servo connected to this 5.8V supply, even if it states it is not suitable for 6V systems, the exception to this, again, are digital tail servos and Align provide a 5.1V stepdown which plugs into the tail servo at one end and the gyro at the other. The advantage of voltage regulated systems is that they maintain a more constant voltage as they have a bit in reserve due to the higher input voltage, with a 4 cell nicad/nimh pack the voltage can drop quite a way under load and slowly as the pack discharges, the bigger and heavier the battery pack you carry the less the effect.
There are other variations upon these themes so it would be good to know what sort of application you have, type of heli, batteries etc. to give a more specific answer.
tiranno
08-09-2007, 09:51 PM
thanks for the info
running ESC the standard one that comes with the V2 (Align RCE-BL35X 35A) , need to check what output it has.
Maybe I need to read the paperwork that comes with it :) :( :) 6V was mentioned somewhere,
how does that work with the servo s9257 rated at 4.8V?
the lipo's I am installing are 11V 2200mAH and that means I must reduce the voltage to the transmitter , Is that correct??? (No I don't think so, as it apparently is reduced inside the ESC down to 6V)
I am good answering most of my own questions.