Subtech APC-4 glitching

[daveee]

Gentlemen
I am making progress on a Revell U-Boat with a Dave's WTC and all the recommended components. Tonight I tried the WTC fully assembled and found everything seems to work fine till I turn on the air pump or the motors. When either is on, the aft dive plane servo goes wonky. It is plugged directly into the APC-4, which is in turn plugged into the forward bow plane servo and the Rx elevator channel.
The pump does have a 1N4001 diode across the terminals, and both the motors (reversing) have a single capacitor across their terminals.
I suspect I need better, bigger, or more capacitors somewhere.
Can anyone help with a fix?
How do you know what capacitance to use?
Do they have to be ceramic disk?
Do you need 3 Capacitors per motor? (They are wired in parallel to counter rotate)
I have (4) .1MFD 35V, TD.1M35's in my stock. Can they be utilized? (They have a + terminal)
Thanks in advance for any help.
Dave E.

[daveee]

Sorry but I have no

Sorry but I have no idea why the print is white!

[pirate]

Dave E.

Use three capacitors per

Dave E.

Use three capacitors per motor. Skip Asay recommended this arrangement, and it's worked well for me. Although, the first APC-4 I had glitched when the motors ran at first even with the capacitors. Then it ended up glitching-twitching all the time when power was on. I had to send it back because it never worked right to begin with, but I didn't know any better until I tried everything else.. If the capacitors don't cure it, it may be the APC-4. The replacement they sent me works just fine.

Hook up the capacitors on all your motors. One across terminals. One from one terminal to the motor case. The third from the other terminal to the motor case. I used 0.1MF ceramic from Radio Shack. But I don't think it matters if they're ceramic or not, just the rating level.

Hope this helps.

Pete

[daveee]

Gentlemen
I tried everything; alternate Rx

Gentlemen
I tried everything; alternate Rx batt, capacitors everywhere, different servo, even tin foil wrapped around the APC-4.
Made no difference.
Finally I moved the APC-4 away from the SES-3 by about 3/4" and the oscillating stopped.
Now my problem is there is no where else to put the APC-4 in the WTC so I am contemplating moving it outside of the WTC. (Or live without the APC-4)(Or start all over again with a mechanical ballast switch setup)
Any ideas???
Thanks
Dave

[daveee]

Test for white print?

Test for white print?

[Guest]

Change your options for white

Change your options for white print to black, mate!!



Edited By Sub culture on 1144262227

[daveee]

Problem under control. I managed

Problem under control. I managed to relocate the APC-4 up into the Rx compartment by removing all the plugs and soldering in wires to achieve a much smaller unit.
Lots of fun, and it works.
I may never build a tiny sub again.
Thanks and truly sorry about the white print!
Dave

[liftmys10]

Wrap styrofoam around your APC4

Wrap styrofoam around your APC4 and see if that helps keep radio freq. away from the apc4. I remember doing this on another R/C product and it worked great!