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ma9

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Posts posted by ma9

  4. sid - no sound

    in Testing/Troubleshooting

    Posted

    hi, i've built a midibox sid with a 6581 chip on it, minimal configuration... the interconnection test works well and the software installation works well too, but i still don't hear any sound. At least.. i hear a low buzz, which changes a bit if i cange the used patch with jsynthlib..

    does anyone know were the problem can be? :\ I have installed first of all the bootloader, then mios and then the sid application (sid6581 without cs).

    yesterday i changed the orientation of the quartz because before it was placed in the wrong way... may it be broken now?

    in "standby" my current voltage values on the 6581 are:

    more or less 4,6V on Cap1A, Cap1B, Cap2A, Cap2B

    0,03V Clk

    11,83V Vdd

    5,30V audio out pin

    4,65V audio in

    5,00V vcc

    0,10V on potx and poty

    more or less 0V or 5V on the logical pins

    the "real" audio out is at 0 volts

  6. Clean old oxidated pcbs

    in Tips & Tricks

    Posted

    Hi my post is a bit off topic perhaps..

    A friend of mine gave me an old Alesis Mmt8 for free, because it didn't work anymore. I've read on the net that this sequencer often has problem with buttons, because it uses gummy conductive pads that touch metal pcb's tracks, like often happens in calculators.

    I cleaned the pcb tracks with alcohol, now they are shiny and now at least they work! But they still don't make good contacts and I have to press a lot to activate them...

    Can you suggest me a good way to clean the conductive tracks better?

    Bye!

  7. Newbie question - Pic possible uses for sound

    in Design Concepts

    Posted

    Hi, I received yesterday 3 sample PICs from microchip, I'm reading the documentation about these microcontrollers...

    I've read that PIC has a 10bit AD converter but not a DA converter. I thought that putting a DA converter after a PIC may make it possible to use it ad a sound generator or DSP, isn't it? Does it work fast enough? Is it possible to code it for making a filter, or a wave oscillator.. or perhaps both of them in the same device?

    I know that 10bits are not that much but it can be useful for a noob to make some experiments..

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