Sinclair QL SCART Lead Wiring

The Sinclair QL also provides a female 8 pin DIN for its monitor socket although the signals output by each pin are slightly different to the Spectrum 128. The pin-out configuration is shown below.

Sinclair QL Monitor Socket Pinout

Pin Signal Level
1Composite PAL 1V pk-pk
20 Volts DC 0V
3Composite Mono Video1V pk-pk
4Composite Sync TTL
5Vertical Sync TTL
6Green TTL
7Red TTL
8Blue TTL

Sinclair QL RGB colour outputs require additional resistors, as does the composite sync signal. The circuitry required is shown below.

Sinclair QL SCART Cable Wiring

Connecting the CSYNC line to the BLANKING pin directly yields about 1.65V and this is between the required range of 1V to 3V. This will cause the TV to display an RGB signal when the SCART socket is selected. However, it may be necessary to provide +12V to the SCART socket's FUNCTION SWITCHING pin if the TV does not allow manual selection of the SCART socket. This +12V must be obtained from an external source, and a voltage regulator circuit can be used as shown for the lead circuitry of the Spectrum 128.

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