nye

i want to build a Radio Controlled car my self...i've tried to copy the circuit from my own RC car, whose control is digital proportional, but it is too dificult..i would appeal to anybody to please giv me the web address of a site that has the circuit diagrams for the transmitter and receiver of a digital proportional RC system, or if anybody would mind sharing the circuit diagram they hav with me..i prefer digital proportional since u can control the speed of the car also..i wouldn't mind even if somebody gives me a similar circuit diagram which achieves the same thing as digital proportional..is PWM control similar to it???

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\"electricity is a good slave, but a bad master\"

audioguru

Good RC equipment is complicated but is inexpensive to buy. They use custom-made ICs that you cannot buy. It would be expensive and very difficult to make it yourself.

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Uncle $crooge

Rolf

Don't know much about RC cars except that the toy ones I have seen and used are not proportionally controlled. You should look for information on RC model airplanes, because they are almost all controlled with proportional width PW servos. The PW controllers is simple and can be build from a 555. You could of cause use the transmitter receiver from the toy car and just add the servo and the control circuit. The car would have to be bigger but that is good because then you would have room for a longer antenna and increased control range. There are plenty of information on the net, just do a little Googling.
I have bought Micro Racers for as little as $5.99 and their receiver - transmitters are great for such things as operating your camera remotely. Link: http://www.pbase.com/sinoline/rf_rem...ntrol_for_d7xx

nye

my knowledge on PW is quite limited..but heard some basic uses of it..yeah..so maybe i'll search and also use some model aircraft circuits for my car..hope it'll work!!!!thanks!!!

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\"electricity is a good slave, but a bad master\"

giaosucan

Ive finished my project about RC car . I used H-bridge to control DC motor of the car.My remote control is a RF transmitter operate at the frequency 315MHZ .The distance is over 100 m .It run so good
You can visit this link to detail
http://www.freewebs.com/giaosucan/edesign/rf.htm

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Nigel Goodwin

Don't know what the regulations are in your country?, but in the UK model aircraft use their own specific band - for serious safety reasons. Model cars and boats use a different band to avoid interference - you should NOT use aircraft R/C on a car.

However, proper R/C model cars are freely available, not the cheap toy ones - look for ones by Tamiya and similar. These are proper R/C models, with proper radio control systems - just like an aircraft, but on a band legal for cars.

Have a look at http://tamiya.com/english/e-home.htm for some examples.

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nye

my country is a little bit strict due to security reasons, and i dont think it is legal to fly RC aircraft...so will check with the tamiya website..also will use giaosucan's idea..but must brush up my electronics knowledge!!!specially on H-bridge and those type of stuff...

__________________
\"electricity is a good slave, but a bad master\"

nye

does H-bridge enable u to vary the speed of the car??or is it a fixed speed???

__________________
\"electricity is a good slave, but a bad master\"

Nigel Goodwin

An H-bridge 'can' allow speed control, but is actually for reversing the motor. Assuming this is for a radio controlled model car?, what you want is an ESC (Electronic Speed Controller), these are freely available along with all the other parts required from radio control and model shops.

__________________
PIC programmer software, and PIC Tutorials at:
http://www.winpicprog.co.uk

Rolf

My post about PW servo control of RC models was not to imply that you should use their radio control freq's. Just for you to take a look at their servo systems, they are applicable to all RC remote control. That is the beauty of DIY electronics, everything can be modified to suit your needs. It is much to be learned about PW modulation and servo control on the net, it is really pretty simple, give it another try. :-)

bsnsatyam

i wants a latest many circuits for home purpose of room current swith baord RF remote controling cuircuits.

BravoKilo

To NYE:

If you wish to study or DIY above, google "NORCIM" and "Thoboise" and you will find many RX and a TX circuits there. They are however, FM. it would be wise to start with an AM TX and RX. I HAVE ALL THOSE SCHEMATICS that I have collected over the years. Google "Heathkit" or "RC transmitter diagram" and you will find the Heathkit diagrams which are AM and was popular in the 60's. I haved simpler circuit diagrams though. Now, making the TX and RX is not for the feeble hearted. If you do not have good electronics background, forget it. You listed your address as Sri Lanka and Aus. If you go to Australia, you might find cheap second hands in flea markets or contact modellers and they usually would have old radios, AM type, which are usually in the attic.But if your purpose is to learn,contact me in my email address: rcdevices@yahoo.com.ph. I am in the Philippines.
It would be wisefoprusto DIY a Japanese radio system. I have old Futaba circuit diagrams.

BK