Conductive tube controlled charging delay circuit

Delay action and instantaneous return circuits are divided into three categories: charging delay circuit controlled by conduction tube, charging delay circuit controlled by cut-off tube
and discharge delay circuit.
    Conductive tube controlled charging delay circuit

Normally, enter U. , is a negative potential , the transistor VTi is turned on, VT2 is turned off, and U is output. . is a negative potential. when
【,. , when it becomes zero potential, VTi is cut off, VT2 is turned on, and the output Use becomes zero potential. From U. . becomes zero potential to U. . The time interval t between becoming
zero potential is the delay time of the circuit.