Sinclair Zx Spectrum Leningrad 48KB PCB

ZX Spectrum Leningrad 48kb (modified board) for self-assembly of a retro computer, clone ZX Spectrum.The diameter of the vias is reduced to 0.4 mm and hidden under the mask.PCB covered with blue solder mask and silk-screen printingA mounting field has been added for installing a tape reader unit on a circuit with K561LN2.Added mounting field for speaker installation on the boardAdded mounting field for power connector installationAdded pins for installing SMD tantalum capacitors on the power busAdded pins for installing SMD components instead of pinoutsThe diameter of the holes in the mounting fields is increased to 1 mm so that you can insert and solder the pin connectors or IDC connectors.ROM chip now need to install one, for example W27C512Video output for connecting to a TV via SCART made on transistors KT3102, bc547Conclusions 1 RU5-x are interconnected to simplify the upgrade. Added mounting field for the audio connector (lin.vhod). Unused trigger leads pulled up on + power.The 10K pull-up resistors for the Z80 data bus are replaced with a resistor assembly.