Suggested by General Electric in a 1967 publication, this circuit uses the D13T1, an uncommon SCR today. This component is triggered by the anode.
Any operational amplifier can be used in this circuit. The 741 is the most common. Power supply must...
This circuit was found in the February 1993 Radio Electronics magazine. The frequency depends on...
This circuit was found in an article about the 555 in the November 1992 Radio Electronics...