Specific features for designing circuits for preliminary processing signals from the PSP-2 flying spot digitizer

The description of separate parts of the up-date counting channel of the PSP-2 (HPD) device is given. Modification of the PSP-2 for the double rate of scanning caused the worsening of signal-to-noise ratio at the output of a photorecording device. Conservation of 3 μm meansquare error required modification of the fsd channel. The device for processing track and reference signals has been developed on the basis of a delay line. Image processing with a wide range of densities and contrasts at the IHEP spectrometer became possible with the use of this device