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  1. D

    ROM address question

    That's great. Thanks again. You've been a lot of help.
  2. D

    ROM address question

    Hi KrisBlueNZ, Thanks for getting back to me. The question on the sheet as it is typed is: "The 16F877A deals with two addresses in program memory automatically. What are these and under what circumstances is each one used? I just read my original thread which says "accesses" which was...
  3. D

    ROM address question

    Hi, In one of the past university assignments I've found online it says that the CPU of the 16F877A can access two addresses in program memory automatically. What are they? I have it in my head that the default start-up address would be the first one, but what would the second one be and why...
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    Delta Sigma DAC

    Hi Harald, Thanks for the quick reply. That has helped me. Dave
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    Delta Sigma DAC

    Hi, I've been asked to compare the delta sigma ADC and DAC circuits as part of a college assignement. I've done the ADC section as I'm happy that I understand what's going on, but I can't get my head around the DAC version. Can anyone give me a quick walkthrough of what's happening at each...
  6. D

    555 Timer circuits

    Hi there, Sorry, I haven't been on here for a while. The circuit was to test a 555 timer input to an independent circuit without sharing a common ground connection. I was using it as a high voltage source for a voltage multiplier. Thanks for your help guys.
  7. D

    555 Timer circuits

    Thanks for the quick reply. I'll go back to my 555 theory in order to fully understand how it works. Thanks very much.
  8. D

    555 Timer circuits

    Hi, I'm experimenting with 555 timer circuits and have made two test circuits. The first works just fine but the second won't. I'm sure the reason is solution is simple but the problem is driving me mad. Please could you tell me why circuit 2 won't work (hopefully attachments are included!)...
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