Circuits & Schematics Texas Instruments - 4

31. Drive any electronic clock with a high-precision 10-MHz reference
    Gavin Watkins
    Circuits Oscillators Beginners Digital Texas Instruments SN74HC00 SN74HC390
    Most electronic clocks, be they analog or digital, use a crystal oscillator (XO) based on a 32.768 kHz crystal for their reference. In fact, it is same crystal that’s commonly used as a real-time clock for many microcontroller systems. These ...
    Oct 7, 2025
32. Circuit controls ratiometric or simultaneous power-up of multiple rails
    Dirk Gehrke
    Circuits Supply Texas Instruments TPS54310 TPS54610
    Many applications use FPGAs, ASICs, or DSP chips, which usually require multiple voltage rails, typically two: the core voltage and the I/O voltage. The core voltage is usually lower than the I/O voltage. Guidelines for determining how to power up ...
    Oct 6, 2025

33. Fake contacts, bounced to order
    Nick Cornford
    Circuits Measurement Microcontrollers Usage Texas Instruments CD74HC132 CD74HC4520
    Many recent Design Ideas ( Ref, 1 ) have involved button-pushing to control power. Some may have been more resistant to contact-bounce than others but how can we really check that? This DI describes how some simple circuitry can simulate bouncy ...
    Sep 22, 2025
34. Capacitor matchmaker
    Stephen Woodward
    Circuits Measurement Texas Instruments CD4013B OPA388
    Precision-matched capacitor pairs are commercially available items, but only in a limited range of values, working voltage, and dielectrics. Plus, sometimes an extra critical application with extra tight tolerances (or an extra tight budget) can ...
    Sep 22, 2025
35. LED driver combines high speed, precision
    Richard Cappels
    Circuits Supply Light Texas Instruments LM324 LM7805
    Applications such as turbidity measurement and densitometry require cleanly pulsed light sources with stable amplitudes. The LED driver in Figure 1 illuminates retinal neurons in a biological experiment that has similar requirements. For a given ...
    Sep 17, 2025
36. Positive analog feedback linearizes 4 to 20 mA PRTD transmitter
    Stephen Woodward
    Circuits Analogue Design Measurement Interfaces Texas Instruments LM10
    I recently published a simple design ( Ref. 1 ) for a platinum resistance detector (PRTD) 4 to 20 mA transmitter circuit, illustrated in Figure 1. Figure 1. The PRTD 4 to 20 mA loop transmitter with constant current PRTD excitation that relies on ...
    Sep 14, 2025
37. Build automatic transfer switch (ATS) with simple analog electronics
    T.K. Hareendran
    Circuits Supply Texas Instruments NE555P
    In today’s world, both households and industrial facilities are exploring ways to improve power reliability by harnessing multiple energy sources, not just the electricity from the grid. One clever solution: Automatic transfer switch (ATS). ...
    Sep 8, 2025
38. Micropower CMOS oscillator, draws only 0.5 µA
    David A. Johnson
    Circuits Oscillators Beginners Texas Instruments CD4007UB
    Conventional astable oscillator circuits that use CMOS logic gates, bipolar transistors or low current op Amps, often require more current than necessary. The circuit shown generates a low frequency square wave signal while drawing only 0.5 ...
    Aug 31, 2025
39. A different twist to the power pushbutton problem: A kilowatt AC DAC
    Stephen Woodward
    Circuits Supply Power Texas Instruments CD4060B
    Design Idea (DI) contributors have recently explored various possibilities for ON/OFF power control using just a momentary contact “shiny modern push-button,” many of which build off of Nick Cornford’s “To press on or hold ...
    Aug 26, 2025
40. 25-kV generator tests insulation
    Lukasz Sliwczynski Przemyslaw Krehlik
    Circuits High Voltage Measurement Texas Instruments LM555
    To generate high voltages with proper insulation between the “hot node” and the rest of the circuitry, a car ignition coil can function in place of a high-voltage transformer. These coils have voltage ratings of approximately 20 kV, so ...
    Aug 26, 2025

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