RCCrawler Forums

yodakrawler · 01-24-2007, 08:38 AM

does it really matter what size resistor you use like if you use a 1/8 is tht sufficent?

roktoy · 01-24-2007, 05:54 PM

Quote:

Originally Posted by yodakrawler

does it really matter what size resistor you use like if you use a 1/8 is tht sufficent?

Yes, most any size should work......it's a low current path.
Jay

yodakrawler · 01-24-2007, 07:25 PM

okay i was asking cause i hooked it up kinda the same way in my mx-3s. and when i used the rear steer it like activated all of the channels it made my throttle work and my front and rear. the front just twitched a little and the throttl just went forward. so what i am think is that on the mx-3s there is only one red voltage wire. i used that for power ths only black wire for ground and and then the middle terminal for the third channel. so my real question is if i use another terminal on the switch area is that enough power for the rear steer

http://www.putfile.com/pic.php?img=4593879

http://www.putfile.com/pic.php?img=4593878

yodakrawler · 01-24-2007, 07:26 PM

maybe this will show up

yodakrawler · 01-24-2007, 07:53 PM

oh and does it have to be five volts cause if it does then i might have found where i went wrong.

roktoy · 01-24-2007, 10:53 PM

Quote:

Originally Posted by yodakrawler

oh and does it have to be five volts cause if it does then i might have found where i went wrong.

Does what have to be 5V?
Jay

yodakrawler · 01-25-2007, 03:24 AM

oh sorry the power wire that you have going to the green does that have to be five volts. cause i have found voltage it is just that when i hit the switch it make my throttle activate and goes forward. i am going to mess around with it a bit but it seem that any where that i get power from i get the the throttle working with it. but it does work in the mx-3s

roktoy · 01-25-2007, 06:24 AM

What radio are you working on?
Jay

yodakrawler · 01-25-2007, 08:03 AM

mx-3s the synthezised unit to the mx-3.

roktoy · 01-25-2007, 09:16 PM

Quote:

Originally Posted by yodakrawler

mx-3s the synthezised unit to the mx-3.

Ah....ok. Not familiar with that one.
Jay

yodakrawler · 01-25-2007, 09:45 PM

yeah neither am i but i was wondering can you actually use a trim pot with a knob on it for your rear steer? i dont know if you know or not but wanted to ask and if you can what size do ou think?

roktoy · 01-26-2007, 06:49 AM

Quote:

Originally Posted by yodakrawler

yeah neither am i but i was wondering can you actually use a trim pot with a knob on it for your rear steer? i dont know if you know or not but wanted to ask and if you can what size do ou think?

Stage 3 uses a regular pot with a knob on it for proportional rear steer.
Jay

DarkOne427 · 01-26-2007, 03:23 PM

I have a couple MX3-S radios and was curious how hard it would be to do this mod, I have yet to pull apart one of my radios. Keep us updated on this, save me from having to test it for my self

luodanli · 02-20-2007, 08:09 PM

Being new to the MX-3, or any computer radio for that matter, I didn't bother to check the default EPA setting for channel#3/AUX. I modded, desoldered, resoldered, pulled traces off the board, and cooked my 10 year old Radioshack soldering iron, only to realize that the reason it would not turn left, was the EPA setting. All fixed now, but the lead to the input circuit is soldered directly to the end of an SMT component. (after cooking the shack 15w, I impatiently pulled out my 60w. Overkill) All that aside, Good tutorial. I'm super happy with my 4ws. Thanks!

Bart bender · 03-19-2007, 02:32 PM

Is it poosible to overload a 10K resistor? Do I need a larger resister? Here is why I ask. I did this mod a long time ago and it has worked flawlessly for me with two momentary on, push switches until now. I am a tight basterd and stole my resisters out of an old junk VCR I had laying around. This third channel in my radio is also running a HS-5645MG servo. When it acts up the servo runs full crank to the left and will not correct unless I turn of the system. I have switched my HS-5955TG with the same problem. Also the resister is reading 5.6K when it is acting up. Here's a couple shots of what I got.

It will come back to 10K sometimes. Do I need a higher voltage resistor? I am not a wiz when it comes to this shtuff.

RC Rock Hugger · 03-19-2007, 07:39 PM

Where is everyone putting the trim pot for the stage 2 mod? I was thinking about putting it in the battery compartment, once its set it shouldn't need to be adjusted much.

Big Mike · 03-20-2007, 07:11 AM

I just used half of a reversing Y-harness for my rear trim.
Yea, the pot is on the rig vs. on the transmitter, but it's cheap and easy to set up though.

roktoy · 03-20-2007, 08:20 AM

Quote:

Originally Posted by Bart bender

Is it poosible to overload a 10K resistor? Do I need a larger resister? Here is why I ask. I did this mod a long time ago and it has worked flawlessly for me with two momentary on, push switches until now. I am a tight basterd and stole my resisters out of an old junk VCR I had laying around. This third channel in my radio is also running a HS-5645MG servo. When it acts up the servo runs full crank to the left and will not correct unless I turn of the system. I have switched my HS-5955TG with the same problem. Also the resister is reading 5.6K when it is acting up. Here's a couple shots of what I got. It will come back to 10K sometimes. Do I need a higher voltage resistor? I am not a wiz when it comes to this shtuff.

Not sure why it would be changing. Yes, you can overload a resistor but we only talking a few milliamps here so shouldn't be a problem. Maybe try a new resistor for a few pennies :-)

Quote:

Originally Posted by RC Rock Hugger

Where is everyone putting the trim pot for the stage 2 mod? I was thinking about putting it in the battery compartment, once its set it shouldn't need to be adjusted much.

That should work or in the bottom of the grip as I showed....lots of possibilities.
Jay

Bart bender · 03-22-2007, 06:29 AM

I ripped a different one out of the VCR a while back and this is the second one in the radio. Are their diff voltage resistors. I noticed the one Mnster has in the pic of his radio looks 3 times the size of mine. Gonna make a trip the Shack and see what they gots. Thanks Jay.

roktoy · 03-22-2007, 08:17 AM

Quote:

Originally Posted by Bart bender

Are their diff voltage resistors.

They're rated by power capacity.....1/8 watt, 1/4 watt, etc. (voltage across multiplied by current thru them).

The can typically withstand high voltages....certainly much higher than any battery we would use.

Jay

01-24-2007, 08:38 AM	#41
yodakrawler Rock Stacker Join Date: Apr 2006 Location: sparks Posts: 70	does it really matter what size resistor you use like if you use a 1/8 is tht sufficent?

01-24-2007, 07:25 PM	#43
yodakrawler Rock Stacker Join Date: Apr 2006 Location: sparks Posts: 70	okay i was asking cause i hooked it up kinda the same way in my mx-3s. and when i used the rear steer it like activated all of the channels it made my throttle work and my front and rear. the front just twitched a little and the throttl just went forward. so what i am think is that on the mx-3s there is only one red voltage wire. i used that for power ths only black wire for ground and and then the middle terminal for the third channel. so my real question is if i use another terminal on the switch area is that enough power for the rear steer http://www.putfile.com/pic.php?img=4593879 http://www.putfile.com/pic.php?img=4593878

01-24-2007, 07:26 PM	#44
yodakrawler Rock Stacker Join Date: Apr 2006 Location: sparks Posts: 70	maybe this will show up

01-24-2007, 07:53 PM	#45
yodakrawler Rock Stacker Join Date: Apr 2006 Location: sparks Posts: 70	oh and does it have to be five volts cause if it does then i might have found where i went wrong.

01-25-2007, 03:24 AM	#47
yodakrawler Rock Stacker Join Date: Apr 2006 Location: sparks Posts: 70	oh sorry the power wire that you have going to the green does that have to be five volts. cause i have found voltage it is just that when i hit the switch it make my throttle activate and goes forward. i am going to mess around with it a bit but it seem that any where that i get power from i get the the throttle working with it. but it does work in the mx-3s

01-25-2007, 06:24 AM	#48
roktoy Dirt Addict Join Date: Jan 2004 Location: Stumblin' thru the parking lot of an invisible 7-Eleven Posts: 1,053	What radio are you working on? Jay

01-25-2007, 08:03 AM	#49
yodakrawler Rock Stacker Join Date: Apr 2006 Location: sparks Posts: 70	mx-3s the synthezised unit to the mx-3.

01-25-2007, 09:45 PM	#51
yodakrawler Rock Stacker Join Date: Apr 2006 Location: sparks Posts: 70	yeah neither am i but i was wondering can you actually use a trim pot with a knob on it for your rear steer? i dont know if you know or not but wanted to ask and if you can what size do ou think?

01-26-2007, 03:23 PM	#53
DarkOne427 Rock Stacker Join Date: Jan 2007 Location: Canada B.C. Posts: 57	I have a couple MX3-S radios and was curious how hard it would be to do this mod, I have yet to pull apart one of my radios. Keep us updated on this, save me from having to test it for my self

02-20-2007, 08:09 PM	#54
luodanli Newbie Join Date: Oct 2006 Location: Las Cruces Posts: 16	Being new to the MX-3, or any computer radio for that matter, I didn't bother to check the default EPA setting for channel#3/AUX. I modded, desoldered, resoldered, pulled traces off the board, and cooked my 10 year old Radioshack soldering iron, only to realize that the reason it would not turn left, was the EPA setting. All fixed now, but the lead to the input circuit is soldered directly to the end of an SMT component. (after cooking the shack 15w, I impatiently pulled out my 60w. Overkill) All that aside, Good tutorial. I'm super happy with my 4ws. Thanks!

Sponsored Links

03-19-2007, 02:32 PM	#55
Bart bender I wanna be Dave Join Date: Jan 2006 Location: Iowa, the antirecreation state! Posts: 2,227	Is it poosible to overload a 10K resistor? Do I need a larger resister? Here is why I ask. I did this mod a long time ago and it has worked flawlessly for me with two momentary on, push switches until now. I am a tight basterd and stole my resisters out of an old junk VCR I had laying around. This third channel in my radio is also running a HS-5645MG servo. When it acts up the servo runs full crank to the left and will not correct unless I turn of the system. I have switched my HS-5955TG with the same problem. Also the resister is reading 5.6K when it is acting up. Here's a couple shots of what I got. It will come back to 10K sometimes. Do I need a higher voltage resistor? I am not a wiz when it comes to this shtuff.

03-19-2007, 07:39 PM	#56
RC Rock Hugger Pebble Pounder Join Date: Apr 2006 Location: Jackson Posts: 105	Where is everyone putting the trim pot for the stage 2 mod? I was thinking about putting it in the battery compartment, once its set it shouldn't need to be adjusted much.

03-20-2007, 07:11 AM	#57
Big Mike I wanna be Dave Join Date: Oct 2006 Location: Martinsburg WV Posts: 2,781	I just used half of a reversing Y-harness for my rear trim. Yea, the pot is on the rig vs. on the transmitter, but it's cheap and easy to set up though.

03-22-2007, 06:29 AM	#59
Bart bender I wanna be Dave Join Date: Jan 2006 Location: Iowa, the antirecreation state! Posts: 2,227	I ripped a different one out of the VCR a while back and this is the second one in the radio. Are their diff voltage resistors. I noticed the one Mnster has in the pic of his radio looks 3 times the size of mine. Gonna make a trip the Shack and see what they gots. Thanks Jay.

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Thread: MX-3 Independent Rear Steer Setup article added.