Oct 25, 2010 #1 neazoi Advanced Member level 6 Joined Jan 5, 2008 Messages 4,122 Helped 13 Reputation 26 Reaction score 15 Trophy points 1,318 Location Greece Activity points 36,951 hello I am trying to make this simple oscillator but it does not oscillate at all. What could cause the problem? The chip is a 74HC00. I have used a 74LS00 instead.
hello I am trying to make this simple oscillator but it does not oscillate at all. What could cause the problem? The chip is a 74HC00. I have used a 74LS00 instead.
Oct 25, 2010 #2 keith1200rs Super Moderator Staff member Joined Oct 9, 2009 Messages 10,865 Helped 2,065 Reputation 4,130 Reaction score 1,596 Trophy points 1,403 Location Yorkshire, UK Activity points 57,270 neazoi said: The chip is a 74HC00. I have used a 74LS00 instead. Click to expand... I think that is probably the problem. The input impedance of LS logic won't allow a 1M feedback resistor. Keith.
neazoi said: The chip is a 74HC00. I have used a 74LS00 instead. Click to expand... I think that is probably the problem. The input impedance of LS logic won't allow a 1M feedback resistor. Keith.