Use old servos with new Rc RX?

[Roog]

Hello again, Its been a long time since I used RC gear.

I have been 'gifted' (almost) an old RC car with 27MHz RX and servos but no transmitter. I am happy to buy a new low cost TX/RX, but I was wondering whether I can use the old servos with the new gear? Servos are Futaba S3003 and Acoms AS-11.
The servo plugs (female) look like they would fit a modern RX. Are they generally compatible?

I only need one channel just to operate the throttle on an IC engine so a big powerful servo isn't required.

Perhaps I should just buy a complete new RC set.

Also I am looking to power the RX from small LI ion cells to save space and weight, are modern RX systems reasonably tolerant of being supplied from two Li ion cells in series, which would certainly be greater than the old 5V-6V systems which I remember. I guess two Li Ion would be nominally 7.4V, I could install a small linear voltage regulator, but I could do without the extra complication.

 

[tntpoof]

wrong on voltage . full li-ions are 8.4 volts Id get a ubec you could set at 5 volts . a new radio and rx is still a value these day just have to search the net for best price, and you can use old servos with new gear.
https://www.aliexpress.us/item/3256...97421f3acb89c9e40384835b&gatewayAdapt=glo2usa

 

[Roog]

Thanks for the tip @tntproof I'll buy one of those, more efficient and cheaper than anything I would have built!

 

[tntpoof]

you could use a Zeiner diode at 4.7 to 5 volts at the correct wattage but if memory serves me correct they are like $=$ each id use 2 one on + side to servos one on neg side to be safe. the s3003 was a piece got rid of those ASAP back in the day

 

[Roog]

Cheers for the ideas, I have bought a UBEC, we shall see how that performs!
I now have another more taxing challenge, but I will open a new thread for that.

 

[Roog]

My new servo arrived this morning, despite checking the dimensions in the advert at least twice it is surprisingly tiny*

Oh well it should fit in really easily

*compared to my old 1970’s futaba waterproof servos!
Now I need my new TX and RX to arrive and I can have a play. It’s like being a kid again