Caswell 3.5” WTC question

[He Who Shall Not Be Named]

Thanks, makes sense now

Buy Bob's book! Remote control submarines | The Nautilus Drydocks (rc-submarine.com)

[SSN687]

Thanks, makes sense now

[He Who Shall Not Be Named]

8/26/2021 PM
OK, thank you for your answers, I’m a dumb a**. I don’t remember seeing these components installed in other WTC, why would these components installed?

Likely because if you blow up the ESC, you also loose all hotel services, which means no fail-safe. A BEC wired off the main power cable will provide hotel services to everything, directly through the receiver bus.

David

[SSN687]

8/26/2021 PM
OK, thank you for your answers, I’m a dumb a**. I don’t remember seeing these components installed in other WTC, why would these components installed?

[Bob Gato]

Google is our friend-and the other one is: http://www.taitroncomponents.com/cat...eet/lm2940.pdf

[trout]

The one with 7805 looks to be a linear voltage regulator.

[SSN687]

8/25/2021 PM
David
I just purchased a 3.5” WTC. The WTC was purchased from Caswell and the previous owner never got it working. I figured out the correct receiver channel and powered it from a 2S battery, I don’t have a 3s battery right now but it requires a 3S battery, and everything worked. I cannot figure out what these black boxes are for in the WTC. The ESC servo connection red power line is taped over and not used.

WTC-1 & 2 – the part is powered from the battery and goes to a channel in the receiver. (Some sorta voltage regulator)
Labeling as best as I can tell
NL
50
^^ MC
7805CT
NLBU947


WTC-3, 4, &5 – the part is on the black lines on the ESC. (I have no idea)
Labeling as best as I can tell
JM990A??
LM29400
+5.0 P

Thanks
Ernie


WTC-1


WTC-2



WTC-3



WTC-4



WTC-5