This Instructable will show you how to make a 2-channel remote control which you can use for your remote control helicopters!
For a multi channel remote control, you can use a CD4017 both in the transmitter and the receiver circuits.
You will need:
2 555 timer ICs
2 10uf Capacitors
2 10k resistors
3 1k resistors
2 10nf capacitors
5 BC547 transistors
2 1N4148 diodes
some wires
A breadboard(it is good to first prototype it)

Step 1: Clock circuit

This part uses:
555 timer IC
10uf Capacitor
10nf capacitor
10k resistor
1k resistor

The frequency of the circuit will be 11.99 Hz. If you want to increase the frequency, reduce the resistance and capacitance and you will be done

This circuit's diagram is not by me. It is from :
It will also have a calculator to calculate the frequency of the circuit.

Also you will need to build one more for the receiver.
Why did clock circuit is required<br>
<p>Tx - transmitter</p><p>Rx - Receiver</p><p>I was wondering? :</p><p>1. What's the use of i/p 1 and i/p 2? Does it change frequency?</p><p>2. What signal goes to input of the Tx? Is it a voltage source with a on/off switch?</p><p>3.Do I need SCR for both Tx and Rx?</p><p>4. In the Tx circuit, the first transistor from left, where is the emitter?</p><p>5. What kind of circuit will I connect at the output of the Tx circuit? Where do I connect the antenna?</p><p>6. What kind of circuit will I connect at the input of the Rx circuit? Where do I connect the antenna?</p><p>7. Is there a formula to know how much frequency is being emitted by reducing/increasing the capacitor and resistor?</p>
<p>1. input1 and input2 are for inputting the voltage signal, which is between 0 to 5 Volts. It doesn't change the frequency, but it changes the amplitude of the output-the signal</p><p>2. They are inputs for the voltage(i/p 1, i/p 2). You may connect a potentiometer to it or directly control it.</p><p>3. SCR is needed only for Rx</p><p>4. The emitter is towards the diode.</p><p>5. Connect an IR LED to the output.</p><p>6.connect an IR receiver(small black thing found inside any STB) to it. I am not sure about the pins of IR thing because there are many versions of it. google the part number and check it out.</p><p>7. Check www.555-timer-circuits.com for the formulas</p>
What would be the advantage of increasing the frequency?
<p>the advantage of increasing the frequency is that the responses will be faster and more accurate.<br><br>It is because one bit of information is transmitted only in one clock cycle. and frequency is number of clock cycles per unit of time. That means, if you increase the frequency, more information will be transmitted in a unit of time.</p>
<p>when i insert not gate,in either transmitter or reciever: circuit does not works. can you please tell me what to do. </p><p>(i am grounding all pins to same termial, is it something to do with it?)</p>
<p>maybe the current in your NOT gate might be very low... if you think your not gate is working, then try increasing the bus current... are you a starter in electronics? if so, i could help you with better diagrams...</p>
Hey, really cool build. <br>I wonder, for the not gate, If i used a cmos inverter to save power, would that work the same way? <br>Thanks
<p>I am not really sure about how the CMOS inverter works, from the word 'inverter' I guess that it inverts the signal...(the signal shouldn't go all the way negative... if that happens, your circuit will get destroyed, be careful) try it wit simpler circuits... i could happen</p>
anything will do... provided that the stuff inverts the signal...
<p>is there only one transistor in transmitter part.i am asking because i am unable to understand input 2 symbol. is it a transistor or a push button.i'm new to circuits, so kindly help me.</p>
<p>actually this one is for those who are beginners to electronics, but sorry, i became too technical...</p><p>Input 2 can be any signal, from your audio, or anything else...</p><p>the diagrams below will help you a lot...</p>
while it appears posible to make a 2.4ghz one ( based off the calculator mentioned, and 2ohm resistance at r1/r2 and a .1nf cap ) would it actually work using this method or would it require some diffrent parts? cause the seconds it takes for a full signal is roughly 4.16*10^-10 or 0.000,000,000,416 .
<p>Well, it requires a better transistor, probably a Gunn diode also... for the high frequency. Theoretically it will work, but the values predicted by theories is not always same as reality.</p>
Could you explain how do you synchronize clocks in transmitter and receiver?
When a signal comes from the antenna, the signal will go to an SCR. then the SCR will turn on with this signal. As it turns on, it turns on the 555 timer and thus, the synchronising circuit works this way.
You will need a SCR(silicon control rectifier) part no. 2N5060 to make the sync circuit. <br>
the receiver with SCR schematic is shown in the last page! <br>
the receiver with SCR schematic is shown in the last page! <br>
I'm also wondering; you need a &quot;SCR&quot; (System Clock Reference). <br>When you're on your workbench: it is a wire. When you have to do it remotely, it needs some more complicated device... Then this tutorial looks like explaining some McGyver trick you can do... provided you have a nuclear rocket in your workshop. It will surely work !
Very cool, I love projects that get down the the roots of a technology. It's cool that you can buy a board with an 1GHz micro-controller on it, and plug in modules for GPS, Wifi, touchscreens and whatever else you like, but it's a lot of fun and very educational to look at the basics sometimes.

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Bio: A person who goes deep into the science of stuff, A tinkerer inventor who makes use of limited resources to invent new stuff. Puts more ... More »
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