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555 voltage controlled oscillators

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myfaithnka

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Hi all,

is there any way we can work the 555 VCO such that its frequency increases when input voltage decreases ?

thanks.
 

Just invert the VCO input control voltage using an op-amp.
 

myfaithnka said:
Hi all,
is there any way we can work the 555 VCO such that its frequency increases when input voltage decreases ?
Click to expand...
Didn't you have a similar thread:https://www.edaboard.com/threads/291139/
Why start a new thread when that thread is only 15 days old ????

Did you try to use a logarthmic amplifier along with antilog amplifier.
Thus 1/V = antilog(log(1) + (-(log(V))).
Often the results may need to be scaled to fit in the voltage range
 
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