I've modified two hxt900 servos like this and each one needed different value resistors to get it to center and have symmetrical travel. 1st one needed a 2k2 + 2k7, and the last one I did needed 2k2 + 3k9. Some experimentation might be required, put the higher value on the side of the pot with the least travel. Another option would be to stick two 5k trimpots to the outside of the servo and make holes on the casing for the wires, then you can adjust the trimpots until it's perfect.
thanks man, glad it helped you out. cheers, a like and subscribe goes along way and helps me out. Thanks again.let me know if you have any questions. cheers.
Great idea! Thank you. I would suggest removing a section of wire equal to the length of each resister to gain back some space, if its tight in there. Also some may find it easier to solder to the wires instead of the tab. Still, heat transfer may loosen the wire at the tab :< Anyway, fantastic mod. Not sure why this works as the swiper does not travel the entire resistance path. Say you have a 5k pot, you add 2.2k to each side, its only moving 1/2 the total resistance. Am I missing something ?
Hi I have question . My servo does not work is just shaking why? Micro servo 9g and I use resistors in colours red red yellow gold .can you help me please
@@MS-lm6zf This is 2 years later but: 2.2K is 2200 ohms which is color code red-red-red. Color code red-red-yellow is 220,000 ohms. It cannot work. The gold is for 5% tolerance.
so I was confused too, but found a solution after some trial and error. here it is: I wanted at least 180 degrees rotation and bought some DS3218MG servos, standard size digital 2kg/cm from DSservo out of china. they are super common, very good quality, and can work from 4.8-6.8v. They have just a standard rotation, despite what some ebay sellers claim. I added two 2.2K resistors to each of the potentiometer outputs, one to each side, on the outside. i did nothing to the center wire. left it hooked up. now i get about 2000 degrees, which i can easily program down to exactly 180 by limiting the end points on my Futaba radio. These servos have no mechanical stops in them, so nothing to modify there.. if your's do, you need to take them out first, otherwise you'll be likely to break something. They work great. I'll be using them for air brakes on my Gemini V-2 UAV. just wanted to share, so hopefully this makes it more clear, and gives some people a clear path forward. Cheers, Everyone!
Hoped I read your comment earlier. Bought from DServo and found out they only do 180 at 500us to 2500us, which is effectively a 90 degree servo. I am disappointed and will have to work something out.
Good day , thank you for your video, it help me alot, I changed my servo from 90 degrees to 180, with a 1,8kU resistor, well done thank you, but I struggle now, i would like to bring down the speed of the servo. can you please help with this, can I put in more resistors or what do you suggest ??
I modified two old Futaba analogue servos. They both had an increased range, but they both had trouble returning to the centre position. Also one of them rotates 90 degrees to the right but when you push left it goes past 90 degrees and will keep rotating right around until you stop with the stick and then it goes back about 90 degrees. How can I fix this problem.
Is it possible to get more than 360 degrees? I’m trying to achieve 3 or 4 complete revolutions - say 1260 degrees end to end. Is that possible and how would I calculate the resistor value required?
Hi mate I need ur help I'm looking for a servo with max of 1kg push or pull force with two wires as I'm splicing it with a rc free spool winch so one way the servo will pull a pin in the winch to engage the free spool then wen the control on the transmiter is released the servo will go back to position ready for the controle to be pushed the opersite way to engage the real in funtion on the winch winch will stop then control is pressed the opersite way engages the servo to pull the pin for free spool and if not ther is a spring the engages the winch clutch wil the sprill pull the servo manually with no electricity or even ad a return damper or shock/spring I'm planning on putting the servo and winch motor into one micro two pin jst male plug so plugs into a mother board room am using
Thanks, yeah i tried to do it that way, but then the PCB board would not fit back in. It may work that way if you left the wire on 1 side of the resistor a bit long and bent them in closer to the board, that might of worked.
I did this mod to an older futaba servo, and it ended up throwing off the center of the servo. I found that for some reason my servo was only supplying around 2 volts to the potentiometer instead of the full 5v input into the servo. I'm guessing this is why it acted so odd. Oh well, I was able to adjust it out in my radio mixer. Thanks for the idea, saved me from buying a premade 180degree servo.
I tried this mod and for some unknown reason it didn't work.. used the same 2.2kohm resistors and and the servo wouldn't respond at all. Removed them and then it worked again as normal.
Thanks dick, yes i believe the 2.2K well show the same results on a bigger servo. Just buy a bunch. At my local elec store they are 25cents each. You can also solder 2 resistors to each other and it well double the resistance. If your using a bigger servo with the extra room.
@@eastcoast78 That's true for series resistors only! Put them in parallel and you get 1/T = 1/x + 1/y where T is total resistance, x is one resister, y the other. So in fact you can mess around with combinations of serial/parallel to get what you need. Excellent idea. Thanks a lot
Yes it does. It works great. Depending on the servo your using, it may be off jsut a touch. But it well be off before oyu do the mod as most avg servos do not center perfectly. Just use a bit of sub trim as per normal.
Why cant the resisters be put on the outside of the servo rather then opening it. It would be a lot easier and a simple coat of conformal coating wold water proof it. I'm no electrician so what is the reasoning for the internal installation?
Junk circuit boards small torch heat violent impact to floor releases tiny surface mount resistors! ohm out each and then use best solderinf skills 3rd hand tweezers, hunt for the right combination of resistance. I miss radio shack but tons of junk circuitboards are waiting to desolder.
+eastcoast78 I was asking because I am building something and wanted more turn in the servo and even adjusting the radio servo travel amount it does not turn enough. Then I found your video and did not realize I had something like add a resistor...... Is the 2.2 resistor for any servo... As fare as u know. Excluding digital
yes any normal 2.2k resistor well work. the servo needs just over 4k total. SO the 2 2.4s work great. Just solder them on the 2 outside poles like in the video and it well allow it to travel the 180. If you feel your not up to it, you can get them pretty cheap on ebay etc.
does this work on a digital servos?? i have a digital servo that pans 180, but i want it to go 360. but i want it to work as normal servo, just that it travels from 0-360. not like most of the 360 servos that goes continually..
eX750F Yes it should work. But you have to take a certain gear out that has a stop(so to speak) on it. Its what causes the servo/gear to stop at a certain spot. If you do not remove it, and mod for 360 it well burn u the servo.
Excelente tutorial. Gracias! Acabo de hacerlo con un servo HEX TRONIC HX12K y funciona a la perfección ampliando el recorrido a 180°. m.th-cam.com/video/EZAHjol1OOM/w-d-xo.html Saludos desde Argentina
DON"T do this for older (and maybe newer?) Parallax servos... It's nothing like the servo in the video, and you will break it trying to open it ... can't wait to try this on servos coming in the mail though.. thank-you!!
would be simpler to put only one in the center one?? I know it sounds really stupid.. but, hey.... "Please don't insult me if I'm wrong. I'm never to smart at this time in the morning.
Worked perfectly with 2.2k resistors on an old Hitec analog servo. Thanks!
thanks bro awesome video 👍😄
Thank you. Far out. Just finished my stand alone wireless head tracker! This will cap it off nice.
glad its helping you
Great video Mike! I'll give this a try.
Thumbs up!
Cheers, Bob
+TripleThreatRC Thanks Bob, its fun doing your own mods. I like the sense of accomplishment. let me know if you have any issues.
I've modified two hxt900 servos like this and each one needed different value resistors to get it to center and have symmetrical travel. 1st one needed a 2k2 + 2k7, and the last one I did needed 2k2 + 3k9. Some experimentation might be required, put the higher value on the side of the pot with the least travel. Another option would be to stick two 5k trimpots to the outside of the servo and make holes on the casing for the wires, then you can adjust the trimpots until it's perfect.
Worked perfectly. Thanks for the video and the education.
bebel25a Your welcome.
Great mod.. i'll try it in a few servos.. thank you man!!
No problem Rodher12. Hope it helps ya.
Thankyou, you are a lifesaver.....I can finally sort out my steering angle I hope!😁
thanks man, glad it helped you out. cheers, a like and subscribe goes along way and helps me out. Thanks again.let me know if you have any questions. cheers.
Great idea! Thank you. I would suggest removing a section of wire equal to the length of each resister to gain back some space, if its tight in there. Also some may find it easier to solder to the wires instead of the tab. Still, heat transfer may loosen the wire at the tab :< Anyway, fantastic mod. Not sure why this works as the swiper does not travel the entire resistance path. Say you have a 5k pot, you add 2.2k to each side, its only moving 1/2 the total resistance. Am I missing something ?
Good video, i have some old servos that id like to try this out with.
yes you should try it, its quite easy.:)
very nice instruction. Thanks
+anhtuanvidi thank you for the kind words.
thank you guy!..You are the best !..I used 4K resistors.
+odontologo98 Awesome, as for being the best, hmm not sure lol
Hi I have question .
My servo does not work is just shaking why?
Micro servo 9g and I use resistors in colours red red yellow gold .can you help me please
@@MS-lm6zf This is 2 years later but: 2.2K is 2200 ohms which is color code red-red-red.
Color code red-red-yellow is 220,000 ohms. It cannot work. The gold is for 5% tolerance.
you can use either a 2.2K carbon or film resistor or as I did, SMD 2.2K which left me lots of room.
Can a servo modified like this still hold a load? Can it keep its position even though a load is being applied to it?
Best video on this topic!
Thank you, please sub and share. Cheers
so I was confused too, but found a solution after some trial and error. here it is: I wanted at least 180 degrees rotation and bought some DS3218MG servos, standard size digital 2kg/cm from DSservo out of china. they are super common, very good quality, and can work from 4.8-6.8v. They have just a standard rotation, despite what some ebay sellers claim. I added two 2.2K resistors to each of the potentiometer outputs, one to each side, on the outside. i did nothing to the center wire. left it hooked up. now i get about 2000 degrees, which i can easily program down to exactly 180 by limiting the end points on my Futaba radio. These servos have no mechanical stops in them, so nothing to modify there.. if your's do, you need to take them out first, otherwise you'll be likely to break something. They work great. I'll be using them for air brakes on my Gemini V-2 UAV. just wanted to share, so hopefully this makes it more clear, and gives some people a clear path forward. Cheers, Everyone!
Hoped I read your comment earlier. Bought from DServo and found out they only do 180 at 500us to 2500us, which is effectively a 90 degree servo. I am disappointed and will have to work something out.
Sir please Reply my servo is tower pro 995 90 degrees please upgrade 180 degrees any solution sir
Please 🙏 Reply sir
Good day , thank you for your video, it help me alot, I changed my servo from 90 degrees to 180, with a 1,8kU resistor, well done thank you, but I struggle now, i would like to bring down the speed of the servo. can you please help with this, can I put in more resistors or what do you suggest ??
I modified two old Futaba analogue servos. They both had an increased range, but they both had trouble returning to the centre position. Also one of them rotates 90 degrees to the right but when you push left it goes past 90 degrees and will keep rotating right around until you stop with the stick and then it goes back about 90 degrees. How can I fix this problem.
While using 2.2 kohm resistor thank!!
Is it possible to get more than 360 degrees? I’m trying to achieve 3 or 4 complete revolutions - say 1260 degrees end to end. Is that possible and how would I calculate the resistor value required?
i have soldered them but it make be continous and cant stop. whats wrong?
hi i was wondering how much watts do i use?
Sir my servo is mg995 tower pro 90 degrees only please upgrade 180 degrees rotate video make sir please
Hi mate I need ur help I'm looking for a servo with max of 1kg push or pull force with two wires as I'm splicing it with a rc free spool winch so one way the servo will pull a pin in the winch to engage the free spool then wen the control on the transmiter is released the servo will go back to position ready for the controle to be pushed the opersite way to engage the real in funtion on the winch winch will stop then control is pressed the opersite way engages the servo to pull the pin for free spool and if not ther is a spring the engages the winch clutch wil the sprill pull the servo manually with no electricity or even ad a return damper or shock/spring I'm planning on putting the servo and winch motor into one micro two pin jst male plug so plugs into a mother board room am using
does this method work for servo 360° to 180° ???
Great video thank you . Could you please give the specs for resistors.
I believe they were 2.2k
@@eastcoast78 may i ask, if we put the reaistors directly to the cable outside will it work ?
@@Bricksfaction hmm good question...i am not sure to be honest. One way to find out is give it a try. :)
wow, so increasing the range of the pot, right?
Thank you
yip, thanks for watching :)
Why not solder the resistor to the other end of the wire or at the circuit board side. /:
Good job, but why dont solder the resistor on the PCB side, look more easy to me.
Thanks, yeah i tried to do it that way, but then the PCB board would not fit back in. It may work that way if you left the wire on 1 side of the resistor a bit long and bent them in closer to the board, that might of worked.
I did this mod to an older futaba servo, and it ended up throwing off the center of the servo. I found that for some reason my servo was only supplying around 2 volts to the potentiometer instead of the full 5v input into the servo. I'm guessing this is why it acted so odd. Oh well, I was able to adjust it out in my radio mixer. Thanks for the idea, saved me from buying a premade 180degree servo.
+James Downing awesome ,glad oyu got it sorted out. Cheers
I tried this mod and for some unknown reason it didn't work.. used the same 2.2kohm resistors and and the servo wouldn't respond at all. Removed them and then it worked again as normal.
Great job, I am gonna go and try it.
If you have a full size servo do you use the same size resistors?
Thanks a Big Bunch
Super way kool man
Thanks dick, yes i believe the 2.2K well show the same results on a bigger servo. Just buy a bunch. At my local elec store they are 25cents each. You can also solder 2 resistors to each other and it well double the resistance. If your using a bigger servo with the extra room.
@@eastcoast78 That's true for series resistors only! Put them in parallel and you get 1/T = 1/x + 1/y where T is total resistance, x is one resister, y the other. So in fact you can mess around with combinations of serial/parallel to get what you need. Excellent idea. Thanks a lot
Before I try this, does the servo still center?
Yes it does. It works great. Depending on the servo your using, it may be off jsut a touch. But it well be off before oyu do the mod as most avg servos do not center perfectly. Just use a bit of sub trim as per normal.
Why cant the resisters be put on the outside of the servo rather then opening it. It would be a lot easier and a simple coat of conformal coating wold water proof it. I'm no electrician so what is the reasoning for the internal installation?
RC crazy hey, thanks for the suggestion. I'm sure it could be done. :)
2.4 kolm 1/8 Watt?
+Dick Gibson yipper
How do you make a head tracking unit with a Draino? Sounds toxic. Lol
Junk circuit boards small torch heat violent impact to floor releases tiny surface mount resistors! ohm out each and then use best solderinf skills 3rd hand tweezers, hunt for the right combination of resistance. I miss radio shack but tons of junk circuitboards are waiting to desolder.
Does it matter what servo I am using?
+Tgreenmi no it should not matter. Ive never done it to a digital servo, so it may also work.
+eastcoast78 I was asking because I am building something and wanted more turn in the servo and even adjusting the radio servo travel amount it does not turn enough. Then I found your video and did not realize I had something like add a resistor...... Is the 2.2 resistor for any servo... As fare as u know. Excluding digital
yes any normal 2.2k resistor well work. the servo needs just over 4k total. SO the 2 2.4s work great. Just solder them on the 2 outside poles like in the video and it well allow it to travel the 180. If you feel your not up to it, you can get them pretty cheap on ebay etc.
+eastcoast78 thanks for your help! Now on to the camera them issues..... Lol
No worries, any probs ask away!
do you lose torque when doing this? 90 deg servo modded to 180 deg = half the torque?
THANKS
torque is associated with gearing no the amount of joules the motor burns ( well kinda).basically, torque will not change
does this work on a digital servos?? i have a digital servo that pans 180, but i want it to go 360. but i want it to work as normal servo, just that it travels from 0-360. not like most of the 360 servos that goes continually..
eX750F Yes it should work. But you have to take a certain gear out that has a stop(so to speak) on it. Its what causes the servo/gear to stop at a certain spot. If you do not remove it, and mod for 360 it well burn u the servo.
Only difference was i used a 0.5 (1/2) watt resistor
will 2.2k 1/2 watt work?
Did the mod to a MG90. Killed the torque. Made it not really usable...
Well u sound like ShoeNice , but anyway Hitec and graupner should start selling these !!! damn i am shocked they dont already wtf ....
Who/what is ShoeNice lol
Please Reply me 🙏 sir 🙏
Hi there sorry. What was your question? Alot of comments go to spam and i lose track of them.
Excelente tutorial. Gracias! Acabo de hacerlo con un servo HEX TRONIC HX12K y funciona a la perfección ampliando el recorrido a 180°.
m.th-cam.com/video/EZAHjol1OOM/w-d-xo.html
Saludos desde Argentina
i can solder this thing without this crocodile clamp!
DON"T do this for older (and maybe newer?) Parallax servos... It's nothing like the servo in the video, and you will break it trying to open it ... can't wait to try this on servos coming in the mail though.. thank-you!!
Thanks for the heads up, I've never heard of those servos though. best of luck with your new servos.
would be simpler to put only one in the center one?? I know it sounds really stupid.. but, hey.... "Please don't insult me if I'm wrong. I'm never to smart at this time in the morning.
Haha no worries m8. no you need two 2.2k resistors and they have to be on the other most poles.
That won't change the voltage division man.
Thank you! I couldn't understand it until now! really appreciate that you allow me to know "WHY"
Dude, I'm working on serious shit really?