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Thread: HU Quality AM/FM RDS/RBDS Radio with Features

  1. #301
    Raw Wave rando's Avatar
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    Quote Originally Posted by racemier
    Actually this is a very intresting question. What do people prefer, LPT (printer port=easy) or USB control? Maybe we can create a poll.
    So people let know what you want.
    I'm pretty sure most people want USB for the final product. The question is does it make sense to pursue interface improvements (i.e. USB over native I2C) until the tuning quality of the design has been verified in an actual car environment? Since the new design involves an integrated tuning chip and passive components, presumably this is less of a concern than with the original Philips tuner IC. Still, if development of the PIC code and associated OS driver(s) is time consuming and/or costly, it might make more sense to produce initial prototypes (for testing) with an I2C interface.

    The parallel to I2C implementation is near trivial. You could even include space on the prototype boards to add on the missing components to support USB. That way you can still target a single layout to keep fabrication costs lower.

    Just a thought.

  2. #302
    FLAC
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    I agree, Id rather have lower cost over USB. Not many use parallel for anything except for LCDs in car PCs.
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  3. #303
    Maximum Bitrate Seth's Avatar
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    Quote Originally Posted by rando
    The parallel to I2C implementation is near trivial. You could even include space on the prototype boards to add on the missing components to support USB. That way you can still target a single layout to keep fabrication costs lower.

    Just a thought.
    Exactly !!! That's why I told you we're still on track

  4. #304
    Raw Wave rando's Avatar
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    @Seth: you're so smart!

  5. #305
    Maximum Bitrate Seth's Avatar
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    Quote Originally Posted by camsgs3
    looking good, what type of inout will be for the AM/FM antenna. Can we use are stock plug. I currently have my stock plug connected to the hauppage WinTV FM USB
    Yes we will use stock HU plug for the antenna

  6. #306
    Maximum Bitrate Seth's Avatar
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    Ok guys the way I see it right now there are two things we must consider :

    USB vs LPT interface

    12V power input and how people that use laptops in the car can handle this requirement


    For the first one the solution is simple...WE CAN HAVE BOTH !!!! It's just a PCB layout design thing to leave the choice to the end user which interface he wants to use. Leave that to us...

    For the second one things are more complex. One thing is for sure: we need 12V. The reason is that an 8.5V tunning voltage is required which is very easy to produce from 12V (downconvert) than from 5V (complex design with unwanted extra cost).
    The way I see it one solution is to make a small regulating circuit which will stabilize the 12V from the car and feed the radio. This circuit will act like the "egg" for the Lillys and will be used only by those who need it (it won't be embedded to the radio PCB).
    Any thoughts on this?

  7. #307
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    How about having a molex and a plug like on the liliput egg, then people can either power from their pc regulated psu or a seperate "liliput egg" style?

  8. #308
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    Quote Originally Posted by rando
    I'm pretty sure most people want USB for the final product. The question is does it make sense to pursue interface improvements (i.e. USB over native I2C) until the tuning quality of the design has been verified in an actual car environment? Since the new design involves an integrated tuning chip and passive components, presumably this is less of a concern than with the original Philips tuner IC. Still, if development of the PIC code and associated OS driver(s) is time consuming and/or costly, it might make more sense to produce initial prototypes (for testing) with an I2C interface.

    The parallel to I2C implementation is near trivial. You could even include space on the prototype boards to add on the missing components to support USB. That way you can still target a single layout to keep fabrication costs lower.

    Just a thought.
    That's my way of thinking too. I just want to design the complete PCB and only put on the components needed for testing which can be done with IC and is perfectly possible.

    Regards,
    Rogier

  9. #309
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    Quote Originally Posted by Seth
    Ok guys the way I see it right now there are two things we must consider :

    USB vs LPT interface
    Personally I'd prefer USB over LPT since I'm trying to squeeze everything
    into a small box and would like to minimize the ammount of external devices.

    Will it be possible to have two units installed at the same time ?

    /M

  10. #310
    Raw Wave rando's Avatar
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    @Maximus: that's a software issue and thus TBD.

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