Signal GeneratorsTelevision - TV Related

Synchronization separator

A circuit that separates synchronizing pulses from the video signal in a television receiver.

This simple sync signal separator circuit separates the composite sync signal into 2 separate horizontal and vertical sync signals. The composite signal can be directly used to drive the monitor’s horizontal sync input.

Synchronization separator: This circuit forms the missing link between various video sources and, say, a multisync monitor. Based on discrete parts only, it extracts the composite synchronization (i.e., a mix of the horizontal and the vertical component) and the vertical synchronization from a composite video signal with an amplitude of about 1 Vpp. The output sync signals are available in true as well as inverted forms to suit your monitor.

Synchronization separator Schematic diagram

The positive composite video signal is filtered by R1-C2 and clamped by a Schottky diode, D1, to extract the sync components. The CSYNC signal is fed to XOP. crate N2 which functions as a; inverter when S1 is closed.

The CSYNC signal is also fed to a two-stage L-C filter which suppresses the line sync component and leaves the raster sync. VSYNC, at the inputs of opamp IC lb. Like. CSYNC, VSYNC is available in true or inverted form.

The circuit draws about 200 pA at a supply voltage of 5 V. The output signals are TTL compatible.

Synchronization separator Schematic diagram

Synchronization separator Schematic diagram
Parts list
Ri, R6 = 11kΩ
R2 = 1 MΩ
R3, R5, R8 = 22 kΩ
R4 = 220 kΩ
R7 = 10 kΩ
C1 = 15 nF
C2 = 330 pF
C3 = 10 uF, 16 V, radial
C4 = 47 uF, 16 V, radial
C5 = 33 nF
C6 = 2.2 nF
C7 = 68 nF
C8= 1.5 nF
C9 = 33 nF
D1 = BAT85
Integrated circuits:
IC1= TL,C272
IC2 = 4030BE
L1. L2 = 47 mH choke, radial
K1, K2, = phono socket for PCB mounting
S1, S2 = miniature on-off switch
PCB Ref. 914077

A resistor is a passive two-terminal electrical component that implements electrical resistance as a circuit element. In electronic circuits, resistors are used to reduce current flow, adjust signal levels, divide voltages, bias active elements, and terminate transmission lines, among other uses.

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