Max capacitance allowed on expander?  
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All Forums >> Radios, Batteries, Clubhouse and more >> RC Radios, Transmitters, Receivers, Servos, gyros >> Radio Manufacturer Direct Support >> Smart-Fly (Quest Engineering) Support Forum >> Max capacitance allowed on expander?
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Max capacitance allowed on expander? - 6/19/2007 6:20:09 PM   
sheetsg



Posts: 115
Joined: 7/12/2004
From: Breinigsville, PA, USA
Status: offline 		Bob,

I've been reading the threads on the 2.4GHz Spread Spectrum receivers. Being a PhD in EE, I've come to the conclusion that maybe some of the reported "lock-outs", "glitches" and etc., may be attributed to the fact that these new Rx's go into a low voltage state, due to high servo load, and hence, reset themselves. Unlike an analog Rx, which will reacquire once power is reapplied, the microprocessor based Rx's used in the new SS Rx's need to "re-bind".

Similar to what Spectrum's (DX6) receiver fix, an external 100uF cap plugged into an unused servo output, I was thinking about an external cap. The question, how much capacitance can I use and still remain stable with the expander's 5v regulator to the Rx?

Greg.
       Post #: 1

RE: Max capacitance allowed on expander? - 6/19/2007 6:27:34 PM   
rrritchey


 

Posts: 627
Joined: 9/29/2004
From: Phoenix, AZ, USA
Status: offline 		Hi Greg,
The regulator for the receiver is a linear regulator. It should not matter how much capacitance you put on it. It has a 22uF cap on its output. The part is a Micrel MIC39100-5.0.


_____________________________

Robert Ritchey
Owner, Smart-Fly

(in reply to sheetsg)
       Post #: 2

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All Forums >> Radios, Batteries, Clubhouse and more >> RC Radios, Transmitters, Receivers, Servos, gyros >> Radio Manufacturer Direct Support >> Smart-Fly (Quest Engineering) Support Forum >> Max capacitance allowed on expander?
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