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Nigel Goodwin said:You appear to be somewhat confused? - you're mixing up capacitor values for an RC oscillator, and the capacitors used with a crystal oscillator.
Taymo said:Ok thanks. Here's another question:
How does one go about calculating the output range in Hz for a RC timer setup?
Pommie said:Nigel Goodwin said:You appear to be somewhat confused? - you're mixing up capacitor values for an RC oscillator, and the capacitors used with a crystal oscillator.
I would respectfully suggest that you are the one that is confused.
Taymo said:Ok thanks. Here's another question:
How does one go about calculating the output range in Hz for a RC timer setup?
I was answering this question. Did you not read the whole thread.
eng1 said:Another question: the frequency of the oscillator is supposed to decrease with respect to the nominal value of the crystal with larger capaitors ... how much??
DanD said:cant you just get a 3pin oscillator w/ built in caps and be done w/ it?
eng1 said:To Nigel: I was just wondering how much the real frequency can be different from the nominal frequency of the crystal. I don't want to use larger capacitor, but tolerances and stray capacitance can affect nominal capacitances... :roll: Thanks
Nigel Goodwin said:DanD said:cant you just get a 3pin oscillator w/ built in caps and be done w/ it?
It's a lot more expensive though, both in money and board space - but if you use the more modern 16F628 it also has an internal 4MHz oscillator, although NOT a crystal one - it is suitable for most purposes though.