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 multi channel ir remote control		  New Topic  Reply to Topic
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surajsun22
Apprentece

India
16 Posts
Posted - Aug 07 2010 :  1:19:27 PM  Show Profile  Reply with Quote
Hi
i've made the ir remote control posted on this site here
http://www.aaroncake.net/CIRCUITS/irremote.asp

and it works great..

now i want to ask whether we can mod it to transmit/recieve more than one channel????

thnx..

audioguru
Nobel Prize Winner

Canada
4218 Posts
Posted - Aug 07 2010 :  4:51:06 PM  Show Profile  Reply with Quote
The oscillator and LM567 are set to one frequency. Make the oscillator produce different frequencies for different channels and make the LM567 receive the different frequencies.

Maybe you need separate oscillators and LM567 ICs.
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surajsun22
Apprentece

India
16 Posts
Posted - Aug 08 2010 :  02:45:44 AM  Show Profile  Reply with Quote
hmm....
where's the oscillator in the circuit.???

and does lm567 ic comes with different frequencies??
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audioguru
Nobel Prize Winner

Canada
4218 Posts
Posted - Aug 08 2010 :  08:36:07 AM  Show Profile  Reply with Quote
The oscillator is the IR transmitter. Its R and C are calculated to produce one frequency.
The R and C in the LM567 circuit are calculated to receive one frequency. Look at its datasheet.
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surajsun22
Apprentece

India
16 Posts
Posted - Aug 09 2010 :  07:56:28 AM  Show Profile  Reply with Quote
U mean to say i can change the values of R and C to change the frequencies???
srry but i'm a noob..
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audioguru
Nobel Prize Winner

Canada
4218 Posts
Posted - Aug 09 2010 :  10:53:39 AM  Show Profile  Reply with Quote
quote:
Originally posted by surajsun22

U mean to say i can change the values of R and C to change the frequencies???
srry but i'm a noob..

Yes.
But the frequency of the very simple oscillator changes all over the place and the bandwidth of the LM567 is fairly wide so you cannot use more than about 4 channels reliably.
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surajsun22
Apprentece

India
16 Posts
Posted - Aug 09 2010 :  11:07:56 AM  Show Profile  Reply with Quote
ok thanxx..
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