Circuits & Schematics Texas Instruments - 7

61. A 50 MHz 50:50-square wave output frequency doubler/quadrupler
    Stephen Woodward
    Circuits Signal Processing, Filters Texas Instruments SN74AC86 SN74AC74 TLV2374
    On two days in the course of every year, one in March heralding the start of spring and another in September marking the first of fall, the Earth’s axis of rotation aligns perpendicular to the rays of the Sun. These days are the equinoxes ...
    Oct 10, 2023
62. Dual op amp takes absolute difference
    Lindo St Angel
    Circuits Analogue Design Signal Processing, Filters Texas Instruments LM2902
    A traditional implementation of an absolute-difference function comprises a difference circuit followed by an absolute-value circuit; the entire circuit requires at least three op amps. The design problem is complicated in single-supply-only ...
    Oct 5, 2023

63. Make gain-control multiplexer R_ON and R_OFF errors (mostly) disappear
    Stephen Woodward
    Circuits Analogue Design Texas Instruments CD4052B TLV2371
    The use of multiplexer chips (typically various members of the 405x family) to control gain in transimpedance (current to voltage conversion) signal-processing and data acquisition op-amp circuits, is an established practice. Using a multiplexer ...
    Sep 28, 2023
64. Single switch controls digital potentiometer
    Chuck Wojslaw Gary M Craig
    Circuits Analogue Design Interfaces Digital Texas Instruments SN74HC132
    The control of electronic potentiometers in most today's applications comes from controller-generated signals. However, a significant number of applications exist that require adjustments using manual, front-panel controls. The circuit in ...
    Sep 21, 2023
65. An LED display adapted for DIY projects
    Peter Demchenko
    Circuits Microcontrollers Usage Digital Texas Instruments CD74HC137 CD74HC259
    This expandable LED display for a microcontroller in Figure 1 has a simple interface with only 6 data/control wires and can be easily accommodated to a DIY design. The display has static indication. Figure 1. The expandable LED display for a ...
    Sep 14, 2023
66. 1-IC design monitors ajar doors
    Fred Hicks
    Circuits Automation Beginners Texas Instruments CD4011B
    If someone in your family has the habit of not completely closing a drawer or perhaps the food freezer’s door you’ll appreciate this design. It senses an ajar door and, if the situation isn’t corrected within 20 sec, sounds a ...
    Sep 6, 2023
67. Current-sense monitor and MOSFET boost output current
    Gyula Diószegi János Nagy
    Circuits Supply Texas Instruments TLC271
    A previous Design Idea describes a programmable current source that used a three-terminal LM317 adjustable regulator (Reference 1). Although that circuit lets you program the output current, the load current flowed through the BCD ...
    Aug 31, 2023
68. Fast(er) frequency doubler with square wave output
    Jim McLucas
    Circuits Signal Processing, Filters Texas Instruments SN74LVC1G74 SN74LVC1G86 TLV3501 TLV9052
    Whenever I find myself harboring a constantly nagging thought, I know I will eventually have to get busy and find a way to put it to rest. When I read EDN’s Design Ideas, I look for the range of frequencies over which the circuit will ...
    Aug 24, 2023
69. Dual RRIO op amp makes buffered and adjustable triangles and square waves
    Stephen Woodward
    Circuits Oscillators Texas Instruments TLV2372
    Rail-to-rail input and output (RRIO) op amps, both FET and BJT, have been around for a long time, but the possibilities they provide for versatile waveshape generation with simple circuits can still surprise. Figure 1 is an example, outputting a ...
    Aug 17, 2023
70. Use a photoelectric-FET optocoupler as a linear voltage-controlled potentiometer
    Sajjad Haidar
    Circuits Analogue Design Texas Instruments LM358A
    You can use a photoelectric FET as a variable resistor or a potentiometer in combination with a fixed resistor. The H11F3M photoelectric FET has an isolation voltage of 7.5 kV, enabling you to safely control high-voltage circuit parameters. The ...
    Aug 14, 2023

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