Circuits & Schematics Texas Instruments - 5

41. A two-way mirror - current mirror that is
    Stephen Woodward
    Circuits Analogue Design Oscillators Texas Instruments LMC555
    One classic set you’ll see in most гvintage mystery movies is an interrogation room with a “two-way” mirror in one wall. This cool gadget lets the witnesses see the suspects from another room while the suspects can see only ...
    May 22, 2025
42. Seven-octave linear-in-pitch VCO
    Stephen Woodward
    Circuits Oscillators Texas Instruments LMC555 SN74HCT74
    Frequent contributor Nick Cornford recently shared design ideas incorporating cool circuits for linear-in-pitch voltage-controlled oscillators (LPVCOs): Revealing the infrasonic underworld cheaply: Part 1 ( Ref. 1 ) and Part 2 ( Ref. 2 ) A ...
    May 21, 2025

43. Another PWM controls a switching voltage regulator
    Christopher Paul
    Circuits Supply Texas Instruments SN74LVC2G14 SN74LVC14A TLV333
    A recent Design Idea, “Three discretes suffice to interface PWM to switching regulators”( Reference 1 ), demonstrated one way to use PWM to control the output of a typical switching voltage regulator. There were some discussions in the ...
    May 20, 2025
44. A simple circuit to let you characterize JFETs more accurately
    Cor van Rij
    Circuits Analogue Design Measurement Texas Instruments TL071A
    In April 2012, EDN published a circuit by John Fattaruso ( Ref. 1 ) that lets you quickly measure the drain-source saturation current and the pinch-off voltage of both an N-JFET and a P-JFET. The pinch-off voltage (V P ) is measured by inserting a ...
    May 15, 2025
45. Converting square-waves into saw-teeth
    Stephen Woodward
    Circuits Oscillators Texas Instruments CD74HC4053 TLV2371
    Generating analog sawtooth waveforms (linear ramp followed by a quick reset to zero) from digital timing signals is a common function. It usually requires a negative supply as sketched in Figure 1, where Negative current through R1 ramps up ...
    May 12, 2025
46. Circuit delivers constant power to a load
    Kiril Karagiozov
    Circuits Supply Texas Instruments NE555
    If you have a load with a variable or poorly specified resistance and want to regulate the power applied to it (a heater for example), merely controlling the voltage or current will not work, as in both cases the power P = I 2 R = V 2 /R depends on ...
    Apr 29, 2025
47. Another simple flip ON flop OFF circuit
    Jayapal Ramalingam
    Circuits Supply Texas Instruments CD4024B CD40106B
    Figure 1 gives a simple circuit for the PUSH ON, PUSH OFF function with only a few inexpensive components. In this design, the output is connected to the input of the gadget when you press the push button (PB) once. For the next push, the output is ...
    Apr 28, 2025
48. Simple logic probe uses bicolor LED
    Mark Shill
    Circuits Measurement Texas Instruments OPA2340
    When probing digital logic levels on a circuit board, locating the indicator of the logic level near the probe tip is convenient, so that you can keep both the indicator and probe tip constantly in sight. When using a handheld DVM or oscilloscope ...
    Apr 23, 2025
49. Reduce EMI by sweeping a power supply's frequency
    John Betten
    Circuits Supply Texas Instruments TL331 UCC3813N-0
    Switching power supplies can be notorious noise generators. You should prevent this noise, which is conducted, radiated, or both, from returning to the input source, where it can potentially wreak havoc on other devices operating from the same ...
    Apr 22, 2025
50. Photo tachometer sensor accommodates ambient light
    Stephen Woodward
    Circuits Measurement Texas Instruments TLV9162
    Tachometry, the measurement of the speed of spin of rotating objects, is a common application. Some of those objects, however, have quirky aspects that make them extra interesting, even scary. One such category includes outdoor noncontact sensing ...
    Apr 18, 2025

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