About connecting a Dreamcast video set-top box. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Телевидение
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In the basic configuration, the video set-top box in question is designed to be connected to the composite video input of the TV. However, on TVs with a SCART socket or an S-video input, it can produce a much higher quality picture, all you need is an appropriate connection cable. Unfortunately, such cables are not commercially available. It is unlikely to purchase the cable plugs necessary for their self-production, which are docked with the "AV OUT" socket of the video set-top box. It remains to remake the cable included in the video set-top box. The plastic case is removed from the plug on it, having previously cut it with a knife along the side seam. Bending the edges of the metal screen, remove the block with contacts.
Contact 1 is removed from the block, the central conductor of the shielded wire is soldered to it (the length is equal to the length of the cable) and the contact is installed in the free socket of the block, intended for contact 11. Contact 13 is transferred to the socket of contact 12. Assemble the connector, remembering to connect the braid of the added wire to the shield of the plug.
It remains to be installed at the opposite end of the cable according to the diagram shown in fig. 1, XP2, XP405 (RP-3 RCA, known as Tulip) and XP4 (mini-DIN-XNUMXM) plugs.
On radio markets, you can sometimes find a cable assembled according to the scheme shown in fig. 2. According to the sellers, it is designed to connect the "Dreamcast" video set-top box to the RGB inputs of the TV. However, the cable has several bugs that prevent it from being used for its intended purpose.
To switch the video set-top box to the RGB signal generation mode, pin 7 of the XP1 plug must be connected to a common wire. And in order for the TV to receive sync pulses in the RGB mode of the video set-top box, contact 20, and not 2, of the XP10 plug should be connected to pin 13 of the XP1 plug.
To switch the TV to receive RGB signals, socket 16 of its SCART connector (with which the XP2 plug is connected) is supplied with a voltage of +12 V. According to the cable manufacturers, it comes through resistor R1 from socket 8 of the same connector. Unfortunately, not all TVs have the right voltage here. Even if it is, this method of switching is extremely inconvenient, because in order to watch ordinary TV programs, you must always disconnect the video set-top box cable from the TV.
To eliminate the shortcomings, make the additions and changes shown in fig. 2 color. The free contacts necessary for this are available in the XP1 plug block. Resistor R1 and capacitor C4, which is no longer needed, are removed.
Often you have to connect either a video set-top box or a VCR to the only SCART connector on the TV. A device assembled according to the scheme shown in fig. 3.
When the video set-top box is turned off, the voltage on the relay windings K1 - K3 is zero, their anchors are released, the TV is connected to the VCR. When the set-top box is turned on, a voltage of 4 V is supplied to the relay windings from pin 1 of the XP12 connector. The contacts of the triggered relays disconnect the audio and video inputs of the TV from the VCR and connect them to the set-top box.
Small-sized relays RES49 (versions RS4.569.421-02 or RS4.569.421-08) and the like can be placed in the housing of the XP5 plug. The power reserve of the 12 V voltage source of the video set-top box is quite sufficient to power the relay.
Author: P. Lyubimov, Bobruisk, Belarus
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