Sorry for the Late response, TeamPink.

When i went by my local radio shack, I was a little unimpressed with their selection of caps in the 4700uf range... I think the closest thing I saw was a variety pack of big caps that appeared to include maybe 3300uf 10v caps? Such caps would have to be combined to reach 4700uf... and I was looking for a one-cap solution.

Anyway, I ended up swinging by a local electronics shop and finding a 4700uf 25v aluminum electrolytic cap that worked well, but it was a little too big for my tastes.

So then I ordered two caps 647-UVR1A472MHA (4700uf 10v) and 647-UVR0J472MHD (4700uf 6.3v) from mouser electronics (data sheet)

They are the smallest 4700uf caps I could find, and mouser has no minimum order quantity and inexpensive shipping.

I haven't used them with my Spektrum receivers yet, well... cause the receivers are on their way back to Horizon... but I'm thinking one of these two caps will work.

P.S. I'm not entirely sure that the 6.3v would work with the 5.5v-6v BEC circuit . It's my understanding that so long as the BEC isn't over 6.3v then it should be fine... but i haven't *proven* it yet.

P.P.S I've noticed that Novak recommends special "low ESR" capacitors for use in the similar application of stabilizing the input voltage to their ESCs. I really don't know what the ESR of the caps I'm using is... so it's possible that some other caps would work better.

Me too! I went to my local radio shack and the best I could find was a 2200 if I didn't want to have a cap that looked like a D battery on my car.

The 3300 10v caps from Radio shack work just fine. At least for me.

I started the Capacitor craze with the suggestion to hook up the 4700 novak cap. With a new receiver, I went to radio shack. All I could find was an 'assortment' of caps, that had the 3300 10v in it. It works just as good.

Some other things aside, the voltage rating has to do with how closely spaced the two plates (conductors) are inside the cap. A higher voltage rating means they are spaced farther apart, to prevent shorting inside the cap. Thats what happens if you exceed the rated voltage of the cap.

Capacitors are like two pieces of tin foil with wax paper in between them, then they are wrapped up into a coil, with a lead attached to each piece of foil. When charged the plates as we'll call them are electrified, as in covered with electrons. As long as there isn't too much voltage (pressure) the electrons won't jump through the insulator. The charge of the two plates lock the electrons onto them by some magical force. No really its like the emf created by each electron traps its neighbors on the other plate, or something like that;)

For size, its best to get as close as possible to the voltage you are working with. In this case around 6 volts. If you go higher, you are not getting maximum capacitance from the capacitor. At 6 volts, a 4700 16v cap will not hold as much juice as it will at 16 volts. A 4700 10v cap would produce more of a jolt of current than its 16 volt counterpart if each were charged at 6 volts...

I also use the 4700 10volt caps from GM racing (part n° 91539.10) and they work excellent.

If I read Pitcrews story then the 4700 6.3 volt caps would be perfect for our application. I have never seen them however in the RC world. The 10 volt caps maybe have a little more reserve for our applications and that's why they are so common in the RC world.

6.3 volts is max allowed voltage. But it's all down to manufacturing tolerances and if you're lucky you get capacitor that exceeds specifications. Usually it's safe to overload capacitor a little bit. I once replace a 400 volt cap with 200 volt cap, it's been working fine for 2 years with 300 volt load. That's pretty extreme example, I was only hoping for it to last about a week and it might have blown up in the first seconds.

High ESR (Equal Series Resistance) is bad, it makes the capacitor act slower and heat up more. ESR increases as the capacitor gets older, it increases as temperature rises, it increases with frequency.
Smaller capacitors have higher ESR, 220uf cap has half the ESR of 470uf cap, 1000uf cap has half the ESR of 470uf, etc.

That GM cap is maybe the best cap you could get worldwide. Has the lowest ESR ratings of a cap that size.

Re: Glitching
 

Just wanted to know where do you use the ferrite magnet to solve your glitching ?

Re: Re: Glitching
 

You clip it onto the lead from the ESC to the receiver. The Yokomo Noise Killer Set is the best.

Sorry for the delay. That is correct the ferrite magnet does go between the ESC, and the receiver. Yokomo sells a smaller magnet outside of the kit. It comes in a pack of two, and it works just as good, and saves a little space.

Used my new Spectrum today for the first time. I have the JRR-1 version. I practiced all day and it worked flawlessly. So far I'm very happy with the way it works. Not one glitch or hit of any type. I would say if it keeps working like this it was a good choice and no ore freq problems or chasing my clip.

Still waiting (6 weeks) for my second receiver to come back from Horizon. . .:weird: :rolleyes:

Is Spektrum IFMAR approved?

Re: Re: Re: Glitching
 

Team Much More also offers a small sized ferrite magnet noise killer...click here for a pic

I was wondering if someone could help me sum up all the problems experienced by some spektrum users. So far, this is what I know about:
1. response lag on tx inputs (only on carpet???)
2. temporarily going into falsafe mode after small crash
3. trims changing
4. bad bind button

Was there anything else? Is anyone actually experiencing glitching? People who find that they must use a power cap...are you sending your units in, anyway? I just received my 3pk unit yesterday.

Re: Re: Re: Re: Glitching
 

I believe that items 1 through 3 were all resolved with software upgrades to the transceivers. Also, if your ESC does not have a very strong BEC cicuit, that is where you need the power cap. The bad bind button was resolved by a trip to Horizon also.

I have been running 6 Spektrum Units in dirt nitro buggies, onroad cars and 1/12 carpet car over the last three weeks. I race 3 days a week. I am glad to report no problems since the last units were returned with new software from Horizon.

Think you will find IFMAR use host sections rules

:D