Post 2003 electronics - common gnd

[Sam Hough]

Hello,

Our 2003 Tiger 1 has two sets of batteries and different ground for receiver vs everything else and opto isolation. Is this really needed? Do the newer models not have a "BEC" and common ground?

I'd like to get rid of the extra battery and it seems slightly overkill to me.

Thanks

Sam

[Adrian Harris]

Sounds a slightly odd setup. I can't see how it's going to work without a common ground. What are the optos isolating ? The old 4QD system does use a DMR203 module to convert the RC signal into something their VTX motor controllers can understand.

The new Armortek Power Module does have a built-in 5V supply for powering the receiver.

Some people have two sets of batteries installed in the tank but only use one at a time, which gives you extra running time as you don't need to recharge, just flick a couple of switches, and away you go again.

Another way to go is to have the motors driven from one set of batteries and the smoke and sound from another. That way the drain from the effects doesn't affect the driving time.

Adrian.

[Peter Silcock]

When you say it has 2 sets of batteries do you mean there is a battery solely for the receiver? If so its simply a case of buying a 24v BEC unit such as the Turnigy one about £6 and wiring it to the main batteries. Is that what you mean?

[Sam Hough]

Hmmm. I think the forum just lost my last post. Anyway...

I just checked and it is a common gnd. I must be going mad.

The 4.8v battery drives the rx, one side of the opto isolated main power controller and relays for elev/turret.

However it seems to need a common earth as the sound unit has three signals from the RX and takes the 24V supply.

I think I will get rid of the extra battery set.

Buck converters look good although I'm not sure if they spit out RF noise.

Thanks

Sam

[Maarten Schutjes]

Perhaps this helps?






(Found it on uktanktalk)

[Sam Hough]

Yes, many thanks.

The BEC Peter mentioned looks good. So I might just remove the speaker from the power box and have 24v and 5v coming out of there.

The sound unit we are replacing though as I don't think it works with the 2013 recoil electronics we have.

Does anybody know if the mechanics of the Tiger 1 recoil changed between 2003 and 2013? ie Will the 2003 turret mechanics work with the 2013 servo etc?

Thanks

Sam

[Adrian Harris]

I don't believe any of the original Tiger models came with a factory recoil system, as it was superseded by the blank firing system, the user agreement for which precludes the use of recoil.

The servo recoil system is certainly tried and tested, whether it be the Armortek version or any of the user developed ones but I doubt there is any provision in the mantlet for PTFE bushes or the like.

Adrian.

[Sam Hough]

Thanks Adrian,

That is what I was afraid of. Dad has a lathe so maybe a little less daunting!?

We have decided to forget about the firing unit so we won't be breaking any agreements.

Thanks

Sam

[Peter Silcock]

Sam I don't think the 4.8 battery will power anything other than the receiver. The switching units will have the 24 v supply IIRC

[Maarten Schutjes]

Your Tiger is this one. I had to search in some boxes, but found it

[Dennis Jones]

Hi Sam,

I have recently replaced the electronics on 2 of the older Tigers and have used the Benedini Mini sound system with one of his 40 watt amplifiers. The old sound system only had engine sounds. I have used the Turnigy 5volt BEC but as to the recoil setup then that's a different ball game altogther. It strikes me you need to bin most of it and start from scratch but still using the Quad speed controllers.

Dennis.

[Sam Hough]

Thanks Dennis,

That is our plan. Has anybody had any luck with hydraulics or pneumatics for recoil? Perhaps overkill for the barrel but I'm still day dreaming about throwing the battery pack around to rock the tank.

btw Just out of morbid curiosity I'll see if the relays still click if the main battery is disconnected. I think I just assumed they would be isolating otherwise why not just use an solid state controller?

Thanks

Sam

[Sam Hough]

FWIW the relays in the 48B units still click even without mains power.

Maybe a factor was that the bundled RC system was 40Mhz system so more prone to interference that modern 2.4GHz spread spectrum systems?

[Stephen White]

Sam, have a look at my Pz III Ausf N build. I did a pneumatic recoil a while ago. I've tried a 100psi system on th Cent but it's not man enough for the job, even having fitted a linear bearing. The latter is on my Cent build thread.

Stephen

[Sam Hough]

Thanks Stephen,

So you think normal elec/mech servos are the best way?

Any idea why pneumatics are so expensive?

Cheers

Sam