Can I overvolt my Tx?

[rex cars]

Bored today, so I took apart some old receiver packs to make a 10cell (2/3A) rechargeable pack. I know that this should be 12v nominal, but a full charge will be a little more than that. Can i damage my tx by feeding it more than 12v?

[Rockcrawler]

How much more? I have not tried it but I would be scared to go over 13 volts.

[clockworks]

Most Txs are designed to work with 8-cell packs (the latest 2.4GHz Txs use 4 cells), so why would you want to fit 10 cells?
8 cells will give you 12v when fully charged.

[rex cars]

My logic on the 10 cells was 1.2*10=12. I was thinking nominal. I told you I was bored
I'l take off two cells. Thanks for the input guys.

[THnCS]

I used to run my 9 cell(peaked at 13.3v) packs in my comp rig and 12 cell packs(peaked at 16.8v)in my scaler. Never had an issue. I had my external bec set to 7volts. I am no electrical guy like JRH, but the esc has an internal BEC of 2-5amps. So I think that is all the power that gets to the receiver. The only way to bypass that is with an external bec. That is why without an external bec most esc's shut down when you are in a bind(not enough power). The only way I see you over volting the rx, is to connect the battery direct to the rx or turn an external bec all the way up. I could be wrong, but is how I have always looked at it. I think most spektrum rx's can take 9vollts safely. I think I read that on their website once.

[clockworks]

Originally Posted by THnCS

I used to run my 9 cell(peaked at 13.3v) packs in my comp rig and 12 cell packs(peaked at 16.8v)in my scaler. Never had an issue. I had my external bec set to 7volts. I am no electrical guy like JRH, but the esc has an internal BEC of 2-5amps. So I think that is all the power that gets to the receiver. The only way to bypass that is with an external bec. That is why without an external bec most esc's shut down when you are in a bind(not enough power). The only way I see you over volting the rx, is to connect the battery direct to the rx or turn an external bec all the way up. I could be wrong, but is how I have always looked at it. I think most spektrum rx's can take 9vollts safely. I think I read that on their website once.

The OP was talking about using the packs in his transmitter.

[ScalerLover]

I put a 9cell 2/3A pack on my Futaba 3PJ with Spekky module the other night and killed the module. 110 bucks down the drain unless Spektrum emails me with good news.

Stick with the 8cell

[clockworks]

Originally Posted by ScalerLover

I put a 9cell 2/3A pack on my Futaba 3PJ with Spekky module the other night and killed the module. 110 bucks down the drain unless Spektrum emails me with good news.

Stick with the 8cell

So the basic Tx still works, you just killed the module?
That's really weird. Have you tried a different module?
I wonder if you just blew the secondary regulator on the main Tx PCB. From what I've seen, Txs often have 2 voltage regulators, one for the main logic board and one for the RF stage. If the RF regulator blows, the rest of the Tx will appear to work. Should be an easy fix.

[ScalerLover]

The tx still powers on with no module in it.

And yes its definitely the module, tons of smoke and a blown cap or w/e you wanna call one of those little things lol.

[clockworks]

Looks like Futaba Txs work differently to the ones that I've taken apart (Spektrum, KO and FlySky). The module must have it's own regulator, rather than using one on the main PCB.

[ScalerLover]

Possibly, its the 3PJ model (slightly older) so im sure theres quite a few differences.

My 8cell pack displays around 10.8v on my tx when fully charged.