Jun 28, 2013 #1 M myfaithnka Advanced Member level 4 Joined Nov 5, 2010 Messages 106 Helped 2 Reputation 4 Reaction score 2 Trophy points 1,298 Activity points 2,022 Hi all, is there any way we can work the 555 VCO such that its frequency increases when input voltage decreases ? thanks.
Hi all, is there any way we can work the 555 VCO such that its frequency increases when input voltage decreases ? thanks.
Jun 28, 2013 #2 E-design Advanced Member level 5 Joined Jun 1, 2002 Messages 2,014 Helped 507 Reputation 1,016 Reaction score 408 Trophy points 1,363 Activity points 14,193 Just invert the VCO input control voltage using an op-amp.
Jun 28, 2013 #3 rahdirs Advanced Member level 1 Joined May 22, 2013 Messages 424 Helped 93 Reputation 192 Reaction score 91 Trophy points 1,308 Location Mordor Activity points 4,492 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 Last edited: Jun 28, 2013
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