Common caps for two escs?

[CraigP]

Hello Craig, I can wait for the design of the mixer and build it. Some components can be found in my city. I could try with one to see how they work.

I don't think you can build the mixer. It is a small, microprocessor design. I'm building the optoisolator like you have. I won't have a schematic for the mixer.

[CraigP]

So you guys are good with the off-the-shelf isolator?

[golfito]

Ok, I had not understood correctly.
I could buy one by ebay later.

[golfito]

I am surprised that there are so many threads about erratic failures in RX / TX and not so much information about how to use an OPTO circuit in the RX / ESC.

[TRUCKPULL]

https://www.ebay.com/itm/DasMikro-RC...9479292?_ul=AR

Mix Ratio could be adjusted from 33% to 100%.

33% is the lowest setting.--- Not low enough.
We need below 10%.

Larry

[golfito]

Understood, thanks for the clarification Larry.

[CraigP]

Just to be clear, that’s 33% at 100% rudder input, to either side. I use D/R Reduction on my rudder, usually about 35%. I do that by making the crank arm larger on the rudder servo and use a smaller arm on the rudder. This brings the range to about 12% after the linkage ratio is in play.

I have one on my single Cat, where I just want some speed break heading into the corner. Only good for oval, right turn only. Let’s me run full throttle and allows me to concentrate on rudder only.

These things can be manipulated any way you want! It’s up to individuals to “see” their entire system, and bring each component into compliance to make that vision a reality.

[golfito]

http://www.mtroniks.net/prod/RC-Accessories/WTail.htm

http://www.mtroniks.net/prod/RC-Accessories/Progmixer.htm

[CraigP]

I don’t think the WTail Mixer will work. It has no adjustments that I could find in the manual.

The Progmixer has programming, but I’m not following the directions well. I would have to try one to see.

[CraigP]

I am surprised that there are so many threads about erratic failures in RX / TX and not so much information about how to use an OPTO circuit in the RX / ESC.

Yes, lots of unexplained failures. Many blame the ESCs. Probably, some ESC’s are more prone to signal glitching that others, I’m sure that’s a true statement. I’m beginning to think that all of my boats need isolation on LV ESC W/BEC. I don’t use ESC’s BEC for Rec/Servo power. Others have posted that some go into current limiting and that’s a big problem!

I’ve also been taking a closer look at the UBEC I got from OSE. It is not an isolated output. Has great current output. But it will carry the ground noise from ripple right into the Rec. A better choice is to use an isolated output, that is galvanically isolated from the power input, which is the noisy battery.

[CraigP]

Here’s my single opto-isolator. I’m going to put it in my DF29 Mono, that has a Turnigy 180A ESC W/BEC. Right now it’s running on that BEC, I need to get an external BEC.

[CraigP]

Here’s the dual isolator with the single. Golfito, this is more like what you need, according to your description. Saving this little baby for the dual build sometime this year!

These are using PS2501-1-L-A, a Panasonic version of the 4N25 that Golfito used. I used 0805 SM resistors and added a .01uF bypass cap, it was laying in front of me.

[golfito]

Excellent!
Very small size

[golfito]

I do not have smd resistors. Only 1 / 4w of wire.
I can gain space if I only use 220ohms. And not the sum of 220ohms + 33ohms to get close to the 249 ohms of the specifications.
But I'm afraid to degrade the circuit.

26907121_1784836525151414_7568026823669613297_n.jpg

[CraigP]

You can use 220 Ohm. I built mine with 232 ohms, I had them handy. Especially with a separate channel driving each isolator. You can gain space by mounting resistors vertically. Stick the lower lead straight into the hole, then bend the upper lead down, parallel with the resistor body. Then each resistor takes just two holes.