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HomeRC & PowerAircraftHelicopterRadio - Servo - Gyro - Gov - Batt › Best solid state HV switch, built by Kurt at Fromeco
10-25-2011 06:23 AM  6 years agoPost 1
Adam Landefeld

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Lehi, UT, USA

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Just wanted to show off the new custom built solid state switch that Kurt at Fromeco just built for me. I called up and told Kurt I wanted a solid state switch that would give me three heavy duty 7.4 volt outputs into my receiver and would use a pin switch to activate. He said... we don't really have that, but I can build it for you! We chatted a bit and he said, you know these might actually be useful now that so many are going full high voltage.

This thing rocks! Three nice heavy duty power feeds into the receiver at a full 7.4v.

So, if you want one like it, just call them Mon-Wed (they are manufacturing items Thurs-Fri and likely can not answer) and tell them you want the one he built for Adam (I'm sure he'll give it a cool name at some point... I'm thinking "Honey Badger" LOL).

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10-25-2011 06:26 AM  6 years agoPost 2
Adam Landefeld

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Lehi, UT, USA

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Oh yeah, and the price is under 50 bucks...

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10-25-2011 07:14 AM  6 years agoPost 3
OICU812

rrMaster

Edson, Alberta, Canada

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so it regulates as well? Or did you mean at 2S full voltage of 8.4 volts?

...Once upon a time there were Nitros, flybars and frequency pins...

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10-25-2011 07:17 AM  6 years agoPost 4
Adam Landefeld

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Lehi, UT, USA

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No regulator, straight 7.4v through from the battery. This switch is so I didn't have to use a regulator like the Kiwi to simply be a voltage pass through buss.

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10-25-2011 07:19 AM  6 years agoPost 5
OICU812

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Edson, Alberta, Canada

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oh ok so your not running a 2s lipo?, no worries then, cool.

...Once upon a time there were Nitros, flybars and frequency pins...

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10-25-2011 07:30 AM  6 years agoPost 6
Adam Landefeld

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Lehi, UT, USA

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Huh? A 2S Lipo is 7.4v not 8.4v... Yes I am running a 7.4v lipo pack for servo power.

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10-25-2011 07:33 AM  6 years agoPost 7
OICU812

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Edson, Alberta, Canada

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7.4 is resting V/Nominal

Fully charged it is 8.4 volts. Each lipo cell in "lithium polymer" is 4.2 volts FULL, 2 x 4.2 = 8.4 volts. Have a nice evening.

Anyhow very cool switch, hope he starts to consider making them for general public as well.

...Once upon a time there were Nitros, flybars and frequency pins...

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10-25-2011 07:39 AM  6 years agoPost 8
Adam Landefeld

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Lehi, UT, USA

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Yeah sure ok, I guess we could go for the battery lesson here, we can also say the thing is a 6.0v battery when fully used up as well... but its far easier to simply go with the advertised rating of 7.4v the same measure that most HV servos are measured at and call it good don't you think?

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10-25-2011 07:45 AM  6 years agoPost 9
OICU812

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Edson, Alberta, Canada

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easier to understand thats the advertised nominal volotage yes, but not its accurate rate of througput and actual specs no sir.

they advertise that for the same reasons when nicad/nimh batts were more common for use in rxs', such as servos being said on "bottom end" was 4.8 volts which how they rated their speeds/torque, however we know that a nicad/niumh rx pack far exceeded the 4.8 volts charged up. No diff on lipo, then the new HV servos for example are shown specs for 7.4, however being speed specs on speed and also add 10% roughly to torque specs at 7.4 volts as fully charged is 8.4 volts. Was not trying to give a lesson or be rude, just to ask as your voltage seemed odd. For your own curiousity just check the full charge voltage next time charging it will be 8.4 if its npot your lithium polymer lipo is no good, have a good night.

...Once upon a time there were Nitros, flybars and frequency pins...

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10-25-2011 08:00 AM  6 years agoPost 10
Adam Landefeld

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Lehi, UT, USA

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Thanks for the additional information. I do understand the ranges of lipo, I run two high voltage (10s and 12s) electrics and have had to become reasonably familiar (or burn the house down). Its a catch 22, the moment I say an 8.4 volt pack someone else will ask "where do you buy an 8.4v pack?" So, not taking it rude, I just seek the path of least resistance and figure labels are the great leveler.

Upshot is that the whole purpose of the post and the switch itself is that without building something goofy myself I was able to get a straight pass through switch, with additional power leads to maintain current across the receiver board and FBL unit (cgy750), and get a nice micro draw solid state switch to boot. Really cleaned up my machine as I was running a regulator as simply a pass through previously. I'll not claim to be a battery expert by any stretch (only been dealing with lipos for about five years now after all) but I do enjoy the HV performance of HV servos running at or around 6 to 8.4v :-)

No, you have a nice night! Seriously!

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10-25-2011 08:38 AM  6 years agoPost 11
OICU812

rrMaster

Edson, Alberta, Canada

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fair enough, they make great products in general for sure. I as well have had them make me up some goodies in past as well, great service!

...Once upon a time there were Nitros, flybars and frequency pins...

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10-25-2011 08:57 AM  6 years agoPost 12
Taipan

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Sydney, Australia

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10-25-2011 02:23 PM  6 years agoPost 13
Phaedrus

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S. Orange County, California

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I am a big fan of the Emcotec switches. Both regulated and unregulated versions. Dual outputs if you want them, failsafe (circuit closed) and magnetically actuated.

http://shop.rc-electronic.com/e-ven...t=6&c=541&p=541

Available in the US from HKM-USA
http://www.hkm-models.com/Emcotec.html

I do have a number of Fromeco products and have used them over the years. Both my R50 and R90 have Fromeco Arizona regulators and Fromeco Re-lion packs in them. Kurt makes good stuff to be sure.

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10-25-2011 05:57 PM  6 years agoPost 14
Lamar Cooley

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Houma,La.,U.S.A.

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solid state hv switch
JediJawa
Curious, will this switch leak the batts. if they remain connected ?
Regards


Here when wanted.
There when needed.
Everywhere when looked for.

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10-25-2011 10:47 PM  6 years agoPost 15
Adam Landefeld

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Lehi, UT, USA

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There is in fact a minuscule draw, it is actually less than the average bleed down rate of a stored lipo though, but to be safe(er) if you are storing for a long period, disconnect the battery.

Futaba Factory Team
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10-27-2011 06:47 AM  6 years agoPost 16
jadams

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East coast USA

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I like that new "switch " from Fromeco. It would work nice on the cgy750. I made my own HV connector utilizing 2 Futaba leads soldered to some 16ga wire with a EC3. connector on the end.. this gives me a direct plug to lipo but I would like a pin or switch.

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10-27-2011 07:35 AM  6 years agoPost 17
Adam Landefeld

rrApprentice

Lehi, UT, USA

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jadams,

I am running this switch/power lead with my CGY750s on both my X50 and G4 Raptors, it works beautiful and the pin switch is superb. If it happened to fail, it fails in the "power on" mode instead of "time to gather the pieces" mode.

Like you I went about soldering together a pigtail and leads to do the same thing, which obviously can be more economical, but I really also wanted a solid state on/off mechanism. The perfect reg that is mentioned above was nice certainly, but the long history of the superior quality of Fromeco products on my helis dictated that I would trust this to them (plus I could get one more power lead, not that it is necessary, but what can it hurt? lol).

Futaba Factory Team
Team FlightPower
Thunder Tiger

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HomeRC & PowerAircraftHelicopterRadio - Servo - Gyro - Gov - Batt › Best solid state HV switch, built by Kurt at Fromeco
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