The series is a series of input buffer equal to the output. In this is such a common collector circuit of air-reinforcement = 1. R value attached to restrict the current use is issued. Great value depends on the indication of its components, is usually not installed or flow is maximized in accordance with the op-amp capability.
Buffer circuit here serves to reinforce the clock signal and synchronization for robust enough to be transmitted through a cable with a considerable distance. buffer circuit should have a fairly low output impedance. because the synchronization clock line and this is the track "bus" that is connected to a series of client (branch) in parallel. output current should also be quite large, so as to move a few branches. output buffer in addition to pulse and synchronization signals can also be used as a source of supply.
Buffer circuit using Darlington pairs that have the advantage as expected above. strengthening the buffer is quite high. R base serves as aretaining basis.Vin flow is the input voltage that comes from a series of MMV ( multivibrator). Where active at the level of ± 6V Vin = VCC.