› ›

Getting audio from Currah uSpeech

Hernán Pablo ÁlvarezHernán Pablo Álvarez
edited February 2009 in Hardware
Hi!

I've just got a Currah uSpeech, it's working (I have the copyright message on top of the screen above the (c) 1982...) but I'm in Argentina, and the uSpeech uses the PAL-I audio carrier, so I can't use it...

There is some way to get the audio directly from the uSpeech, without mixing with the RF output of the Speccy?
Post edited by Hernán Pablo Álvarez on

Comments

  • Hernán Pablo ÁlvarezHernán Pablo Álvarez
    edited February 2009
    aowen wrote: »
    I'm sure my unit included a mini-jack which you could plug into the IN port to play through the internal speaker.

    I thought that the mini-plug is used by the uSpeech to take the Speccy's audio and mix it with the uSpeech audio and RF video signal...
  • Matt_BMatt_B
    edited February 2009
    Hern?n wrote: »
    I thought that the mini-plug is used by the uSpeech to take the Speccy's audio and mix it with the uSpeech audio and RF video signal...

    Yep. It's an audio input, not an output.

    I'd think that you'll need to take the case off and run a wire from the audio signal before it's mixed into the RF. I don't think the innards of the MicroSpeech are very complex so this shouldn't be too difficult.

    However, I've not got one to hand so I can't give you any more of a pointer than that. Has anyone got a schematic or a photo of the insides of one?
  • rokoroko
    edited February 2009
    Matt_B wrote: »
    Has anyone got a schematic or a photo of the insides of one?

    According to notes I once made there is a one transistor LC oscillator for the sound carrier, tuned with a trimmer. The sound is modulated onto that, the result is simply mixed with Speccies HF over a diode.
    The mini-plug indeed is input for Speccies sound, but it is via a simple filter connected with the AY-sound so it is quite well possible that audio can be taken from there.
  • Bob StainsBob Stains
    edited February 2009
    aowen wrote: »
    If you could get a pin-out of the allophone chip

    The datasheet :)
Sign In or Register to comment.