Circuits & Schematics Texas Instruments

1. A digital frequency detector
   Ariel Benvenuto
   Circuits Signal Processing, Filters Digital Texas Instruments SN74AC10 SN74HC74
   I designed the circuit in Figure 1 as a part of a data transmission system that has a carrier frequency of 400 kHz using on-off keying (OOK) modulation. Figure 1. A digital frequency divider circuit that detects the presence of a 400-kHz carrier, ...
   Oct 14, 2025
2. Circuit forms divide by 1.5 counter
   David A. Johnson
   Circuits Beginners Digital Texas Instruments SN74HCT02 SN74HCT74
   Two inexpensive ICs divide a TTL clock signal by 1.5. By following the circuit with another flip/flop, you could also generate a divide by three function. Materials on the topic Datasheet Texas Instruments SN74HCT02 Datasheet Texas Instruments ...
   Oct 10, 2025

3. 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
4. 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
5. 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
6. 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
7. 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
8. 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
9. 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
10. 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

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