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InterCom / Door Phone

Discussion in 'Electronic Projects Design/Ideas/Reviews' started by Non89, Nov 11, 2010.

  1. Boncuk

    Boncuk New Member

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    Hi AG,

    please ring the door bell again when we are approaching 300. :)
     
  2. Non89

    Non89 Member

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    i will turn the tracing paper...


    its because your PCBs provided seem cant been edit , some trace are wide , some trace are small ... and my college printer seem cant support to print it... that why i redesign it ....

    there wont be overlapping on component, because i was using more larger component's size to design , this is why my design is bigger than yours ....

    for the switch , is this leave the no2 no connection?
     
    Last edited: Mar 23, 2011
  3. Boncuk

    Boncuk New Member

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    Take care to build the circuit mirrored.


    The images provided here were *.gif files. You can't use them to create a board for two reasons: they are not to scale and they have the components. A PCB layout should be printed having the dimension layer (20) the bottom layer (16) and the pads layer (17)

    Just check part sizes thoroughly. It's looks ugly anyway.

    Yes, pin2 is unconnected. Where would you like to connect it? It's wired as ON/OFF switch!
     
    Last edited: Mar 23, 2011
  4. dave

    Dave New Member

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  5. Non89

    Non89 Member

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    because i was curious about the switch connection you sent me last time... so i just to confirm ....

    and i not understand what's the(20), (16) and (17) mean...
     

    Attached Files:

  6. Boncuk

    Boncuk New Member

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    Layer20 is the dimension layer
    Layer16 is the bottom layer and
    Layer17 is the pads layer using Eagle.
     
  7. Non89

    Non89 Member

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    DTDP switch got many type? My DTDP switch is ON, OFF, ON .... when supply to mid(2 & 5) , switch left to on LED on right , Switch right to on LED on left....

    and about the circuit.... it only function 1 side , mean when speak on slave's mice, master's speaker voiced .... but when speak on master's mice, slave speaker is silent....
     
    Last edited: Apr 3, 2011
  8. DerStrom8

    DerStrom8 Super Moderator Most Helpful Member

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    A DPDT switch is a DPDT switch. Whether it is ON, OFF, ON or ON, OFF, OFF, etc. depends on how you wire it.
     
  9. Non89

    Non89 Member

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    but if i follow the connection provided, the D1 (silent) cant light up but its just a small problem , the main problem is the circuit can't function well
     
    Last edited: Apr 4, 2011
  10. DerStrom8

    DerStrom8 Super Moderator Most Helpful Member

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    Have you soldered it all to a PCB yet? (without wires all over the place) and in a shielded box?
     
  11. Non89

    Non89 Member

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    i soldered all component on PCB d , except mice, speaker and switch connecting through wire, i need to confirm it work only can made shielded box ....
     
  12. Non89

    Non89 Member

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    1)i want to ask , what the purpose of 2.2k ohm resister (R5)
    2)the IC is easy get hot after speak, after making the shielded container , the problem can be solved?
    3)when speak at mice 1, the voiced out from speaker 2 is not as loud and clear as when speak at mice 2 to speaker 1, any solution can improve it ??
     
  13. audioguru

    audioguru Well-Known Member Most Helpful Member

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    It is obvious that R5 is the collector load resistor for both transistors in the first schematic in this thread.

    The IC should be cool. It gets hot when something is missing or connected wrong.

    The original circuit is perfectly symmetrical with a volume control at each speaker. Maybe the R11 and R18 attenuator attenuates too much.
     
  14. Non89

    Non89 Member

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    i was exactly follow the original circuit now , although the speaker 2 is not clear enough but everything is still work well.... just the IC temperature increasing after voiced out....
     
  15. Non89

    Non89 Member

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    the master's PCB design as shown
     

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    Last edited: Apr 11, 2011
  16. audioguru

    audioguru Well-Known Member Most Helpful Member

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    Do you have a TDA7052 or a TDA7052A?
    What is the supply voltage?
    What is the speaker impedance?
    Was the amplifier running a continuous loud tone for a long time?
     
  17. Non89

    Non89 Member

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    i using TDA7052
    the suppy voltage is 12V
    the speaker is 8ohm 0.5w
    i just closed to normally speak, not even more than 8-10sec.....
     
  18. audioguru

    audioguru Well-Known Member Most Helpful Member

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    The datasheet for the TDA7052 shows a 6V supply when the speaker is 8 ohms. 12V is too high which causes 4 times as much heating as with a 6V supply.
     
  19. Non89

    Non89 Member

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    oic, thank you ~

    hmm.... i think 6V is not enough to support loudly voice.... how many ohms for the speaker i needed to 12V supply? or maybe can try the heatsink as the datasheet listed....
     
    Last edited: Apr 11, 2011
  20. audioguru

    audioguru Well-Known Member Most Helpful Member

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    With a 6V supply and an 8 ohm speaker the output power is 1W to 1.2W which is much louder than a cheap clock radio. A door phone is used when the person is directly in front of it so it does not need to be loud.
    With a 12V supply then 1W or 1.2W is produced into a 32 ohm speaker.

    The datasheet says that with a 6V supply and an 8 ohm speaker then no heatsink is needed.
    How can you add a heatsink? It is not made to use a heatsink.
     
  21. Non89

    Non89 Member

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    oic, i thought heatsink just place closer to the IC ....

    i will try the 6V tomorrow ... thank you ~
     

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