[NSRCA-discussion] Futaba output voltage
Fred Huber
fhhuber at clearwire.com
Thu Sep 14 05:19:24 AKDT 2006
I am unsure of the signal lead voltage with any other RX than the 127DF. I
know those RX's have the signal lead at more than 1 volt below the voltage
the servo motor sees. I have noted improved servo response, particularly
when using long servo leads when I used the glitch buster circuit before.
As a byproduct of the dual-inversion it boosts the signal voltage.
I have been told that JR's competing RX's have a higher voltage in the
signal lead... but wasn't told how much higher.
I haven't bothered to test other RX signal line voltages... I have confirmed
the significant drop in the Futaba 127DF.
I have not used the glitch busters with other RX's YET. I am working on
making the smaller chip version...
I was looking at a problem with my soldering skills and the small chips..
and found a site that has a circut board designer program that will
fabricate the boards. (for a price of course...)
The opto-isolating systems that power the RX from one battery and servos
from another would also give the higher signal line voltage to the servo...
These things are not as good as the opto isolation for preventing feedback
interference... When Radio Shack carried the chips... they were a cheap,
easy altrnative.
Turning out to be a mess this round. Darn circuit using a 32 cent chip, 7
cent capacitor and 5 cent resistor... gonna end up costing me about $6 each
(plus the connectors to RX and servo lead) to make.
----- Original Message -----
From: "Anthony Romano" <anthonyr105 at hotmail.com>
To: <nsrca-discussion at lists.nsrca.org>
Sent: Thursday, September 14, 2006 7:38 AM
Subject: [NSRCA-discussion] Futaba output voltage
> Hi Fred,
> Am I to imply from your comments below that Futaba receivers output a
> lower
> than optimal voltage to the servos? If so could I get a benefit from just
> changing receivers?
>
> Anthony
>
>
>>From: "Fred Huber" <fhhuber at clearwire.com>
>>Reply-To: NSRCA Mailing List <nsrca-discussion at lists.nsrca.org>
>>
>>Note that using a dual-inverter "glitch buster"
>>http://www.uoguelph.ca/~antoon/gadgets/noiserx.htm (especially with Futabe
>>127 DF RX's) will boost the signal line from the RX output (appx 3.8 v for
>>the Futaba 127 when using 4.8 v NiCd pack) to full RX pack voltage. This
>>can increase effective resolution. (especially with long servo leads)
>>The circuit is INTENDED to filter interference from long leads... and it
>>works. The side effect is almost as good as the intended purpose.
>>
>> If you can find the chip to make the circuit... I'm having trouble
>>finding the DIP (.10 inch pin spacing) I got some .05 in pin spacing
>>chips... which are going to be harder than heck to solder into the
>>circuit,
>>but should do the job.
>> ----- Original Message -----
>> From: Scott Pavlock
>> To: NSRCA Mailing List
>> Sent: Wednesday, September 13, 2006 4:59 PM
>> Subject: Re: [NSRCA-discussion] berg 7 channel Rx
>>
>>
>> {trimmed}
>> The nice part about this is it gives the ability of any analog servo to
>>output twice its normal torque.
>> {trimmed}
>>
>> Scott Pavlock
>>
>>
>> On 9/13/06, White, Chris <chris at ssd.fsi.com> wrote:
>> Hi Mike Mueller,
>>
>> Oops.I meant to imply "They seem to be okay in low cost electrics"J
>>I'm not ready to try a $50 receiver in a big-buck R/C application either.
>>
>> Chris
>>
>>
>>
>>
>>----------------------------------------------------------------------------
>>
>> From: nsrca-discussion-bounces at lists.nsrca.org
>>[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of mike
>>mueller
>> Sent: Wednesday, September 13, 2006 1:44 PM
>> To: NSRCA Mailing List
>> Subject: Re: [NSRCA-discussion] berg 7 channel Rx
>>
>>
>>
>> I know that Castle took a long time to introduce them to the market.
>>The initial designs that they had right after taking over Berg were not up
>>to the standards they wanted. I'm really impressed with these and can't
>>wait to try one. I'll also test them in a small IC plane before having
>>confidence in a pattern plane. The people at Castle are top notch. It's
>>also good to see an electronic component actually made here in the US.
>>Mike
>>
>> "White, Chris" <chris at ssd.fsi.com> wrote:
>>
>> Hi Mike,
>> I know some foamie guys are using these and treat them like they are
>> a
>> standard.....They should be okay.
>> Chris
>>
>> -----Original Message-----
>> From: nsrca-discussion-bounces at lists.nsrca.org
>> [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of
>> Michael
>> Wickizer
>> Sent: Wednesday, September 13, 2006 12:24 PM
>> To: nsrca-discussion at lists.nsrca.org
>> Subject: [NSRCA-discussion] berg 7 channel Rx
>>
>> Anybody have experience with these receivers? At only 8 grams, sure
>> would
>> be a weight savings in electric applications.
>>
>> http://www.castlecreations.com/products/berg_7-channel.html
>>
>> Mike
>>
>>
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