hi,
i am trying to use a 555 timer to build a voltage controlled oscillator. I am finding that by increasing the control voltage i send to the 555, the lower the frequency, so i do know how to generate for example, 50kHz or 500kHz. this seems to be verified after doing a couple google searches.
My problem is how can i increase the range of frequencies that the 555 can output? for example, if i can generate 50kHz, the range of frequencies is from 50kHz to 100kHz, or if i generate 500kHz, the range is from 500k to 550k. I have seen the formula
f = 1.44/(C*R)
which i believe gives the center frequency, but i dont really know what parameters i can change to increase the range of possible frequencies. e.g. i want my 555 timer to be able to output between 50kHz and 500kHz, which i suppose means increasing the bandwidth of my vco?.
thx
i am trying to use a 555 timer to build a voltage controlled oscillator. I am finding that by increasing the control voltage i send to the 555, the lower the frequency, so i do know how to generate for example, 50kHz or 500kHz. this seems to be verified after doing a couple google searches.
My problem is how can i increase the range of frequencies that the 555 can output? for example, if i can generate 50kHz, the range of frequencies is from 50kHz to 100kHz, or if i generate 500kHz, the range is from 500k to 550k. I have seen the formula
f = 1.44/(C*R)
which i believe gives the center frequency, but i dont really know what parameters i can change to increase the range of possible frequencies. e.g. i want my 555 timer to be able to output between 50kHz and 500kHz, which i suppose means increasing the bandwidth of my vco?.
thx
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