[hpsdr] External speaker with Mercury

[Willi Reppel]

Hi all,
Texas Instruments specifies for the stereo-audio-codec chip TLV320AIC23B an audio output of 30 mW per channel into a 32 Ohm load.
best 73 es gl de
Sm6OMH  Willi 
  ----- Original Message ----- 
  From: Bob G Mahrenholz 
  To: Máximo EA1DDO_HK1H ; HPSDR 
  Sent: Wednesday, June 08, 2011 9:11 PM
  Subject: Re: [hpsdr] External speaker with Mercury


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  Hi Maximo,

  I have similar thoughts. I had a Softrock and built a little amplifier for it to drive a speaker. I am putting together a HPSDR right now and
  haven't gotten my Mercury card yet but I suspect it will need a little amplification to drive a speaker.

  I am thinking about building a speaker amplifier on a card that will plug into the Atlas backplane. I will have a couple of empty slots. I will
  use one of the Ten-Tec Model 1550 Utility Audio Amplifiers. I will include a volume control on the card.

  I have just ordered a Pinocchio card as an possible foundation to build the amplifier on. I will only install the lower connector and cut off the
  top of the board with the other connector. I will have to either insulate my components from the traces on the board or cut them (except for
  +12v and ground) at the bottom connector.

  I wish someone would come out with a blank board with only a connector so we could build circuits to plug into HPSDR.

  Let me know if you find enough power out of Mercury to drive a speaker.

  Thanks,
  Bob
  K4QQK



    -----Original Message----- 
    From: Máximo EA1DDO_HK1H 
    Sent: Jun 8, 2011 1:54 PM 
    To: HPSDR 
    Subject: [hpsdr] External speaker with Mercury 

    Hi all,

    I am thinking to install a external speaker for the audio. I can see two jacks on the Mercury card, one is LineOut and the second is Headset Out.
    I wonder if anyone has connected a speaker to the headset output.
    Has the headset out enough power to drive a small speaker?
    or, It is a must to use the LineOut and an external audio amplifier?

    Thank you

    73, Maximo - EA1DDO







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