We found this circuit in the July 1988 Radio Electronics magazine. The frequencies are given by capacitor C1 and the voltage input is made at pin 1.
This circuit was found in an old publication about transistors. The circuit can be used to drive...
September 2017 - STMicroelectronics STBR3012-Y high voltage rectifier for automotive use is in...
Found in a Popular Electronics from the 80s, this circuit is intended to indicate the presence of...