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Old 05-30-2003, 10:13 AM   #1
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Default Capacitors for your receiver?

Hi, I was looking at the new RCCA mag and saw some guy hardwired a pair of capacitors to his receiver. Now, I have seen capacitors attached to speed controls but never on receivers. Anybody know how to attach them, and if Radioshack has them? Thanks for any info.
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Old 05-30-2003, 08:21 PM   #2
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You can use a power capacitor from Novak that is used on there speed control(GT7)all you need is one large one.Then solder a harness plug on the lead's coming out of the capacitor(dont use the white wire on the harness,this is only for signal)plug into an exrta slot in your reciever(but not in the BEC slot).you really only need to do this if your are having radio problem's when you accelerate.The capacitor act's as a filter.
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Old 05-30-2003, 09:24 PM   #3
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The capacitor does aid as a filter, but I just learned from someone else that the reason pro's run them is because when you nail the throttle off the line, the power all goes to the motor, causing you to lose power in the reciever and servo, which causes slow steering. The capacitor helps give a little power reserve to keep the servo up to speed. When every little bit helps, I suggest using a cap on the reciever.
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Old 05-30-2003, 09:46 PM   #4
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Quote:
Originally posted by BrianJ
...plug into an exrta slot in your reciever(but not in the BEC slot)...
So does this mean I won't be able to do this with a 2 channel rx like the XXL?
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Old 05-31-2003, 10:38 AM   #5
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Quote:
Originally posted by Addict sa RC
So does this mean I won't be able to do this with a 2 channel rx like the XXL?
Not totally sure on that,I e-mailed Charlie from Novak on this let you know on Monday.
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Old 06-01-2003, 08:17 AM   #6
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Oh great! thanks for the info guys!!
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Old 06-02-2003, 02:04 AM   #7
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Capacitors in the receiver are used because the digital servos need pulsed high current, and because the current is routed though the receiver problems can occur. These problems are mainly glitching related. Some speedos, like the quantum, don't cope that well with digital servos without a capacitor. Glitching can occur while ccelerating heavily.
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Old 06-02-2003, 02:07 AM   #8
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The capacitors on Maifields car in the magazine are the ones from the origional cyclone ESC. He uses them with low turn mods to help prevent glitching by making the sure reciever has power even when the motor sucks lots of power.
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Old 06-02-2003, 05:46 AM   #9
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jesset hit the nail on the head. if the bec on your speedo is poor (quantum is only 2A) then if you wire a hot servo the rx and wiggle your steering, the current drain is so high that the pulse channel on the receiver loses voltage and causes the speedo to go into brake (well it does on mine).

the cap is a big resevoir so if the current draw gets too big you don't get a glitch. I don't think its actually radio inference just enormous drain

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Old 06-02-2003, 06:58 AM   #10
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You all probably don't remember when we used to run mods with 1200 packs. Well often the motor would pull so much power from the battery that you would glitch. Novak used to sell a capacitor to plug into their receivers called a Stutter Stopper.

Same idea is to keep a small supply of current stored in the capacitor to be available for the receiver when the motor is pulling a heavy load off the battery.
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Old 06-02-2003, 11:39 AM   #11
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Quote:
Originally posted by Addict sa RC
So does this mean I won't be able to do this with a 2 channel rx like the XXL?
Talked to Novak,you can plug it into any open slot on reciever including the BEC slot.
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Old 06-02-2003, 12:04 PM   #12
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Quote:
Originally posted by Randman
pro's run them is because when you nail the throttle off the line, the power all goes to the motor, causing you to lose power in the reciever and servo, which causes slow steering. The capacitor helps give a little power reserve to keep the servo up to speed.
i think you wont have that problem with a 7,2 servo? right?
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Old 06-02-2003, 12:08 PM   #13
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Quote:
Originally posted by BrianJ
Talked to Novak,you can plug it into any open slot on reciever including the BEC slot.
EXCELLENT!! I have a futaba receiver, would the Novak capacitors work on it?
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Old 06-02-2003, 02:56 PM   #14
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yes any capacitor would work.

sanj
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Old 06-02-2003, 09:07 PM   #15
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Thanks sanj by the way I love your personal site, lots of cool stuff, especially your article on home-made tire warmers.
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