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FireWire 400 and 800: how to choose 4, 6 or 9 pins
Learn how to identify 4, 6 and 9-pin FireWire connectors, choose the right cable and avoid power and compatibility problems.
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SDI vs HDMI: which connection to choose for professional video
Compare SDI and HDMI on distance, connector, resolution, installation and reliability for cameras, live production, events and professional video.
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DC power supply: voltage, amps and polarity
Choose a DC power supply by checking voltage, amps, power, connector size and polarity to avoid faults or damage to your equipment.
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RS232 and null modem: how to choose a DB9 cable without mistakes
Learn to tell straight-through DB9 from null modem, male from female, pinout and USB-to-serial adapters before connecting RS232 equipment.
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TV aerial cable: IEC, F connector and 75 ohms
Tell IEC and F connectors apart, plus 75-ohm coaxial cable, shielding and length, to connect DTT, TV, satellite or a set-top box.
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My printer won't detect USB: cable, port and diagnosis
Diagnose why your computer doesn't detect the printer: USB-B cable, port, driver, print queue and tests in order.
