Transmitter Receiver For Domestic Use

Georacer

Joined Nov 25, 2009
5,181
The circuit you posted isn't that hard to build. It actually will take very little space on a PCB.

Do you have any questions regarding the circuit you posted?
What does the PIC have to do with this project? Do you intent to use it as a "sound chip"?

What do you have in mind when you talk about an IC?
 

Thread Starter

AAAGR

Joined Oct 23, 2011
9
First of all, Kai egw ellinas eimai.
I understand how the transmiter works. What troubles me is the reciever.
I dont fully understand how it operates and also what are these symbols that look like amplifiers?

The PIC will receive an input pulse from the reciever but the PIC part is not of my concern cause it is my partners job.

When i say IC i mean if there is something that includes the recievers and transmiters circuits within the IC.
 

Georacer

Joined Nov 25, 2009
5,181
Καλησπέρα,

The building instructions are quite clear. The theory of operation eludes myself too, but I 'm sure other members can help you on that.

The dotted triangle is a logic gate, an inverter. See here for its datasheet:
http://www.datasheetcatalog.org/datasheets/90/206781_DS.pdf
It will output the inverted logic level its reads in its input.

If I read the schematic correctly, when the receiver is triggered, the input voltage at the sound chip will go high, powering it. You can replace this with a PIC input to command it to do whatever you want.

Alternatively, there are commercial remote doorbells that work with batteries. You could mod their receiver and drive their LED or buzzer output to your PIC.

Other people's input is welcome.
 

Thread Starter

AAAGR

Joined Oct 23, 2011
9
I mean an IC that would include pretty much everything. I was thinking about an IC that has all the circuity within it. I m not sure if such a thing exists so all suggestions are accepted.
 

debjit625

Joined Apr 17, 2010
790
I dont fully understand how it operates and also what are these symbols that look like amplifiers
Georacer already answered that,you can find a bit more about it here
http://en.wikipedia.org/wiki/Inverter_(logic_gate)

When i say IC i mean if there is something that includes the recievers and transmiters circuits within the IC
Why would somebody do that ,receivers and transmitters at the same place it will be useless.Yes if you are only trying to do a duplex communication, but as per your project it seems that it's not the case.

I mean an IC that would include pretty much everything. I was thinking about an IC that has all the circuity within it. I m not sure if such a thing exists so all suggestions are accepted.
No, not possible as you have to bias the IC and in RF circuitry there are some components which can't be fitted inside an IC .The circuit you posted is quite easy...go with it

EDIT:
If you are using PIC you can use RF transreceiver ,but that will make your circuit a bit complex and more costly but the end result will be a efficient system.

Good Luck
 
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praondevou

Joined Jul 9, 2011
2,942
I mean an IC that would include pretty much everything. I was thinking about an IC that has all the circuity within it. I m not sure if such a thing exists so all suggestions are accepted.
yes it exists.

you need this:
http://www.linxtechnologies.com/products/rf-modules/lc-series-low-cost-transmitter-modules/

and this:
http://www.linxtechnologies.com/products/integrated-circuits/ls-series-remote-control-encoders-and-decoders/

Have a read through their datasheets and ask if anything is unclear.
 

Wendy

Joined Mar 24, 2008
21,906
The RF section is a modified Colpitts oscillator (Google it) that uses the PCB traces as components. Since we don't have the PCB layout it will be hard to reproduce. The 32Khz crystal oscillator is a modulating frequency, and is probably illegal in the USA and other countries (though it is sold commercial) only because the FCC hasn't noticed it yet. Being a weak oscillator, it will fall under the radar indefinitely.

You can find other kinds of oscillators that are friendlier to build elsewhere. Amateur Radio (AKA HAM radio) do this routinely.
 

Thread Starter

AAAGR

Joined Oct 23, 2011
9
I checked Colpitts oscillator. The one in the web site though, doesnt have 2 inductors. So what formula would give the output frequency? What i want is to build a simple remote controlled device that sends pulse-s to trigger a programmed reciever circuit. Do you know any other simpler solutions?
 

Wendy

Joined Mar 24, 2008
21,906
I used to build simplier solutions. A single transistor is all you need for a transmitter, it is definately not complex.

What part of the world are you? It would help with parts, among other things.
 

Wendy

Joined Mar 24, 2008
21,906
My current thought is to build either a simple AM or FM transmitter circuit with a simple tone. You could use a minuature AM or FM radio with a tone decoder (most likely an op amp filter circuit) to activate a buzzer.

I'm not where I can google on computer at the moment, you could google "simple transmitters" and see what comes up.
 
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