Set-base coupled monostable circuit

set. The base coupled monostable circuit is shown in the figure with only one coupling branch changed.
That is, the capacitor C is used to replace the Ri and cj of the VT1 tube in the picture, and the phoenix is ​​used to connect the positive power supply and - instead of R being connected to the negative power supply . Since it is a monostable,
it only needs to be triggered on one side, thus eliminating the trigger circuit of the base of the VT1 tube.