Hi friends

ist my first time my Name Anwar my nack anwar2 im from Oman Rc my hobby
its nice to join with ur forum can any one hellp me to get
RC diagram for models because im good in Electonic I can make it on PCB
no problem if it old typ electronic parts like transistor and capastors ect

welcome

hi No answer

With LM1871 and LM1872 ICs  you can build a complete RC system.
The LM1871 is the Tx ic and contain a six channel coder and the RF section.
The LM1872 is the Rx ic and contain the receiver and decoder section.
This is a simple to build system but simple does not mean that it not sophisticated, simple because of use of these special ICs.These ICs were available in Delhi then,but that was way back in 1998. If you can find these ics then try this option it is quit simple to build and also adjust.
A practical circuit along with PCB is given in the data sheets of these ICs which you can download from the net.
You can build a 27,50 or 72 Mhz system.
I  personally built a 27mhz system and it worked fine. Also the crystal for 27mhz
are available easily (third overtone).I still have this system somewhere and will
post a picture if I find it.

Jitender

There are threads on this here already !

http://www.rcindia.org/radios-and-receivers/diy-radio/

http://www.rcindia.org/self-designed-diy-and-college-projects/dir-rc-system/

Hi,
ORIGINAL PAGE
http://radio-control-schematics.blogspot.com/2007/07/basic-radio-control-encoder.html 

This is just a simple multivibrator with one timing resistor selected by a CMOS Johnson counter. In this way the start of each pulse is determined by a different potentiometer. Each potentiometer should vary from 0 to 100K. Note that normal joysticks used for computers may be fitted with a linear 100K pot but provide only 60 degrees of the total 300 degrees of movement. This means that you should either fit a 500K pot or change the timing capacitors (10n) in the encoder circuit.
The ON pulse from the multivibrator should be about 300nS to 400nS in length and the OFF pulse should vary from 200nS to 1200nS. With this timing you should be able to drive almost any of the cheaper servo's (eg. Futaba, Horizon etc). The servo should give you a 180 degree movement for the full movement of the encoder pot. The 10K resistor in the encoder circuit prevents a zero-ohm pot stuffing the full supply voltage on the base of the transistor. The 300K resistor determines the length of the silence between each channel pulse-train. This period of silence should be about 4mS or more. The 4017 outputs 0 - 8 can be used to give you 9 independant proportional channels but the tenth is used to provide the silence between each channel pulse-train. I have only shown six channels in the drawings so output 7 must be used to reset the counter back to 0 again.
===============================================================
ORIGINAL PAGE
http://radio-control-schematics.blogspot.com/2007/07/basic-radio-control-decoder.html 

OP-Amp "a" amplifies the incoming pulses from the receiver. This stage is self biassed and may be connected directly to the output of a ZN414Z, ZN416E or any other output with between 0 to +6vDC standing potential. If the output of the receiver is capacitively coupled, has a standing negative DC potential or is DC grounded then couple the signal in via a 10nF capacitor and connect a high value resistor (470K - 2M2) between the two points marked with an "X". The output of this stage should be a near perfect square-wave. This square-wave is used to clock the channel counter and "top-up" the charge of a capacitor.
OP-Amp "b" compares the charge on the "top-up" capacitor. During the 4mS silent period this capacitor will discharge causing OP-Amp "b" to reset the counter. Note that the 4017 output 0 is a reset output and the channel outputs are 1 to 6 (up to 9). The output signal from each channel terminal is a single pulse which varies from 600uS to 1600uS depending upon the setting of the encoder channel potentiometer.
A normal servo has three wires; Black, Red and White. Black is negative, Red is +6vDC and the white is the pulse input from the receiver. Servo's normally draw 300mA to 500mA which may disturb the recever. If this is the case then feed the +DC supply to the servo via a 10 ohm resistor and feed the receiver +DC supply via a diode and connect a 470uF accross the receiver supply.

Again, using Ceramic Filters, you can make 432, 455,465 KHz subchannels in a 27MHz channel link (Or in a 2.4GHz link) separately and can easily make three individual 9 Channel Tx i. e. 27 Channels.

Just read the site and read from the link pages too. You can have A month's food for reading.

Thanks

As far as I know, "standard" pulse width for model servos is 1.5 ms,+/- 0.5 ms, i.e.  1 - 2 ms. I cannot see a 0.3-0.4 ms pulse working . Have you tried it?

Also, no point in posting a link when the whole has been "cut and pasted" and vice versa.

Found the PCBs. The rx and tx

Thanks all of u Brothers Thanks alot

Quote from: jitender on February 06, 2011, 08:45:50 PM
With LM1871 and LM1872 ICs  you can build a complete RC system.

I  personally built a 27mhz system and it worked fine. Also the crystal for 27mhz
are available easily (third overtone).I still have this system somewhere and will
post a picture if I find it.

Its Ok But the conecting Diagram needed
Ican Bay It im near Dubai every thing available here but nice to make some thing by ur hands

In my post I have mentioned that the whole project (circuit and even PCB ) is given in the data
sheet which you can download from the net.I made mine from the information given in the data sheets, even the coil details are given.
Let me know if these Ics are available, I will help you out with the rest.

Jitender

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yes thank u jitender yes i have seen all  ater than my last mgs thanku very much
Anwar2