Projects in the June 2002 issue of EPE Magazine | |
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It is suggested that readers with this problem use the 740L6010 device instead, which requires less current, but it is an open collector device and a resistor of, say, 1k should be wired between its output (pin 5) and the +Ve line from the PC. However, if you intend to only use the thumb probe (and NOT monitor your heart using chest probes), the opto-isolator could be powered at 5V from the unit's own supply. Also note that unless a "crossover" cable is used, the signal connection from IC5 pin 5 should go to the D-connector (socket SK3) pin 2, not pin 3 as shown in Fig.2 and Fig.3. SK3 is a 9-pin female type. A suitable cable is a D-range 9-way male to female (straight through). Maplin part number at the time of writing is VD73Q. |
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Also in the the 2002 issue: new Technology Update describes the world of glass and silver high-speed non volatile memories. Circuit Surgery tells you the correct way to use X-Class and Y-Class capacitors safely on mains supplies. Interface - our PC Interfacing feature - shows how to access serial ports via the mscomm control. Net Work (our Internet page) delivers a briefing on UK broadband access and the exciting applications that are in store for users in the future. |
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