• Improved laser-diode-clamp circuit protects against overvoltages 1/7/2008

  Expensive semiconductor laser diodes have no tolerance for fast voltage or current transients. To minimize the risk of damage, a standard JFET-clamp circuit shorts the laser when there is no supply voltage, thus protecting ....

  Hot-swap circuit allows two computers to monitor an RS-232 channel 1/7/2008

  The hot-swap serial-interface circuit in Figure 1 allows two computers to see all of the communication between each computer and each device on the communication network ....

  RS-232-to-TTL converter tests UARTs with a PC 1/7/2008

  When using a computer for debugging or testing UARTs you often need an RS232-to-TTL adapter. But most of these adapters require an external power-supply adapter to power up the RS-232 transceiver. This external adapter ....

  Programmable current source requires no power supply 1/7/2008

  Engineering labs are usually equipped with various power supplies, voltmeters, function generators, and oscilloscopes. One piece of equipment missing from many such labs, however, is a current source. This omission is ....

  Capacitive touch switch uses CPLD 1/7/2008

  Capacitive touch switches work by measuring the change in capacitance of a PCB (printedcircuit- board) pattern depending on the placement of a user’s finger over a sensing pad. Capacitive switches are becoming ....

  Dual flip-flop forms simple delayed-pulse generator 1/6/2008

  Some applications require clock-timing adjustments, such as generating precision clocks for time-interleaved ADCs, or delay adjustments in a variety of precisiontiming and pulse-delay applications. This Design Idea describes ....

  Transmission lines simulate digital filters in PSpice 1/6/2008

  Designers use PSpice mainly to simulate analog circuits. However, you can also simulate digital filters with it. The main components in a digital filter are delay elements, adders, and multipliers. Although you can implement ....

  Use thermoelectric coolers with real-world heat sinks 1/6/2008

  Peltier devices, also known as solid-state refrigerators, or TECs (thermoelectric coolers), actively cool temperature-sensitive electronic components, such as optical detectors and solid-state lasers. A glance at any TEC ....

  Circuit and software provide accurate recalibration for baseline PIC microcontroller’s internal oscillator 1/6/2008

  All of Microchip’s (www.microchip.com) baseline PIC microcontrollers have internal 4-MHz oscillators, which are useful for freeing up one or two pins for I/O use and allowing ....

  Microcontroller moving-dot display interface uses three I/O lines 1/6/2008

  The moving-dot display has some benefits over the bar-graph display: It better indicates the location of a detected object in sonar and radar applications; it needs only one LED’s currentlimiting resistor instead of ....

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