put a cap in yer ass……

[ph2t]

no, not really, lol…

Seriously though, has anyone put a large capacitor on the ESC pcb? It s meant to help acceleration apparently.

Check it out here:

http://www.rczone.net/modules.php?name=News&file=article&sid=373

I ll give this a go, one day……

ph2t.

[PandaBear]

A smallish cap (~600-1000uF) on the battery inputs
often helps to avoid radio glitching if you’ve
put in a hotter motor.

A larger cap (1000-3000uF) might give you a little
more ‘punch’ in a larger RC… although not sure
what a MiniZ would do with it. Probably nothing on
a stock PCB, maybe something on a modFET’d one.

You’d probably get better results by getting some
known low-InternalResistance AAA batteries… or
rig up some AAs instead.

Cap goes across the battery inputs, closer to the
ESC PCB the better.

[ph2t]

Thanks BigW, I’ll give this a go and let people know……

:approve:

ph2t.

[jamiekulhanek]

I have been trying to find some caps for a while, DSE had 1 farad capacitors in their catalogue, but don’t stock ’em and i can’t find any other place that sells ’em.

A guy in my electronics class brought a capacitor car in to fix the other day….MY LORD 4.7 F 2.5v capacitor….3 of these might do it, but at 25 bucks a set for the toy cars….i think i’ll pass.

Do supercaps have high internal resistance anybody??

Did some testing last night 🙂 Tested Energizer 750AAA NiMH’s. Their max discharge is 12.7 A!!! Quite high!!! Though the battery voltage drops to like 0.9v per cell.

[jamiekulhanek]

Quote:

A smallish cap (~600-1000uF) on the battery inputs
often helps to avoid radio glitching if you’ve
put in a hotter motor.

Definately need one of these, when i gun the throttle, the car can do funny things.

[jamiekulhanek]

Wills which AAA cells do you think is the best???

[ph2t]

Quote:

Quote:

A smallish cap (~600-1000uF) on the battery inputs
often helps to avoid radio glitching if you’ve
put in a hotter motor.

Definately need one of these, when i gun the throttle, the car can do funny things.

Surely the ceramic caps on the motor end are for that purpose? High value caps (>1uF) will only filter out low freq noise.

ph2t.

[jamiekulhanek]

Ph2t, the ceramic caps filter out RF noise, created by the motor commutator, but when the throttle is ‘gunned’ the instantanous current draw soars to around 10 times stall current which might be a couple of hundred amps for a plasma dash motor, this current draw drops, but this huge draw of current drops the battery voltage so low that it starves the electronics and makes the electronics malfunction and do funny things.

[PandaBear]

Quote:

Wills which AAA cells do you think is the best???

Still swearing by the Energizer NiMHs, James.

I’m sure there’s probably better cells out there, but
none as reliable & easily available as these.

Even my postoffice sells ’em! 🙂

[Aaron]

1 Farad at about 16v good for you Jamie? or bigger?

I’ll grab a couple in my next FET order (in the morning)…

A.

--
Site Owner Guy.

[ph2t]

what’s the dimensions of this cap Aaron? got a product number? vendor info?

cheers,

ph2t.

[jamiekulhanek]

Quote:

1 Farad at about 16v good for you Jamie? or bigger?

I’ll grab a couple in my next FET order (in the morning)…

A.

Ahhhh cancel that aaron, i have been reading up on these and they have very high resistance…..therefore they only push small amounts of current.

I bought 3 tiny 16v/2200uF/85 degree capacitors wich can supply big current.

2 of these=4400uF, 3 of these=6600uF wills what do you think would be better???

Wills, energizer (japanese cells) are all I use these days….expensive but i like to think i am buying the best.

[Aaron]

No worries…

How about 10000uF 16v?

--
Site Owner Guy.

[jamiekulhanek]

Anything larger than 5000 becomes less beneficial.

Basically if a cap is very small for it’s capacity, then it has high internal resistance.

[Author]

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