InterCom / Door Phone

[Non89]

ok ... i can learn for more ^^

 

[Dragon Tamer]

I'm sorry, I can't tell if that's a yes or no. I'll post the schematic anyway.

The RFID card reader is a Parallax serial RFID reader like this one: **broken link removed**

 

[Boncuk]

two p1 pots?? not only have 1 p1 pots at master circuit there ?

I changed the original design to have P1 on the master PCB only since familiar persons will operate the device. The slave has two fixed value resistors (R10 and R11) to set the volume.

Turning the volume pot all the way down there won't be anything audible.

Boncuk

 

[Boncuk]

here are the circuits you 1st and 2nd time you sent for me , i want to ask why got 2 more extra connection , that mean i need shielded 6-wire cable ....?

You asked for more connections to connect the intercom to the sound card of your PC!

Boncuk

 

[Non89]

You asked for more connections to connect the intercom to the sound card of your PC!

Boncuk

no need connect to pc , so i just follow the 1st circuit enough ?

 

[audioguru]

The intercom will feed all kinds of nasty noises from outdoors into the home.
Dogs barking, cats fighting, motorcycles, trucks and jet airplanes.

I think it should be turned off when it is not being used and be turned on by the person outdoors pressing the doorbell button. Then the master can turn it off when the communication is finished.

 

[Boncuk]

The intercom will feed all kinds of nasty noises from outdoors into the home.
Dogs barking, cats fighting, motorcycles, trucks and jet airplanes.

At this time it will probably also feed the lovely voices of angels singing Christmas songs.

 

[Non89]

The intercom will feed all kinds of nasty noises from outdoors into the home.
Dogs barking, cats fighting, motorcycles, trucks and jet airplanes.

I think it should be turned off when it is not being used and be turned on by the person outdoors pressing the doorbell button. Then the master can turn it off when the communication is finished.

ya ..... but the intercom not having a "privacy switch" which is function as a POWER ON/OFF of the intercom??

 

[Non89]

i went to shop viewed , i dunno whether inside got shielded or not , and the shopkeeper dunno, got any out look to showing me ??

and is the cable using is audio cable ?? but what i found is just have 2 wire inside

 

[Boncuk]

ya ..... but the intercom not having a "privacy switch" which is function as a POWER ON/OFF of the intercom??

The circuit I suggested doesn't have a POWER ON/OFF switch. Without a POWER ON/OFF switch you'll have the advantage of listening to outdoor voices. Just your own voice won't be heard when the switch is in the "SILENT" position.

Boncuk

 

[Non89]

so i can add On/Off switch on master circuit??

 

[audioguru]

so i can add On/Off switch on master circuit??

If you turn it off then you won't hear that there is somebody at the door unless you have a doorbell.

 

[Non89]

audioguru , how about RCA cable use for tv , is this shielded?

 

[Boncuk]

52 posts for a simple problem like that goes over my mind. (It's almost killing me).

I'm out!

Boncuk

 

[audioguru]

A cable with an RCA plug on each end is used for each channel of audio from a TV to an amplifier and the cable is shielded. But it might be too short for an intercom.

 

[Non89]

that mean i can using it on the intercom , the length is ok , i need to try 1st

 

[Non89]

52 posts for a simple problem like that goes over my mind. (It's almost killing me).

I'm out!

Boncuk

sorry , boncuk ....dont leave , i still need your help too....

 

[Non89]

AC or DC used in the intercom ??

 

[Boncuk]

Just guess if +12V should be AC or DC.

 

[Non89]

should be DC