Found in the February 1983 Radio Electronics magazine, this circuit uses a FET and has good gain at the frequencies determined by the components. The FET is any general-purpose FET.
This is the traditional voltage follower configuration with the 741 operational amplifier. The...
S The purpose of this circuit, found in a 1975 publication, is to suppress the noise that occurs when...
In the figure we have the way to trigger a 7555 CMOS monostable with a positive pulse. The time...