Synchronization Separat0R

from an idea by J W v Dijk Many monitor chassis currently offered by computer surplus stores have separate inputs for horizontal and vertical synchronization signals. Most home micros, however, have a composite video output, so that some form of interfacing is required to drive these bargain monitors. The Type TBA950-2 is a sync separator chip which is fre- quently encountered on TV chassis. In its standard appli- cation circuit, it requires to be driven by a flyback signal derived from the output of the line frequency oscillator. With- out this signal, which is applied to pin 10, the sync pulse would end up somewhere among the picture lines. To be able to use the TBA950-2 in the present application, the horizontal pulse is slightly shifted with the aid of a double monostable multivibrator, IC2. The operation of the circuit should be clear from the accompanying timing diagram. The output pulse from the TBA950 is fairly wide (26 ps), and its positive edge triggers the first MMV (Q1...