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Guest mondo


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I have constructed the FSBUS ComIII, display abd Key boards. Everything is running fine except for the fact that I have to use a 12 volt supply instead of 9. It seems the voltage doubler (NE555) is not doing its job properly. I have only 8 volts at pin 3. Is it possible that I have used a wrong value cap? I equated the 100n and the 10n cap to .1 and .01 microfarads. Is this correct? The unit will run on 9 volt supply but when flashing the pic I have to have 12 volts supplied. Any help would be appreciated.

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