Circuits & Schematics Texas Instruments - 10

91. Solar day-lamp with active MPPT and no ballast resistors
    Stephen Woodward
    Circuits Supply Solar Texas Instruments CD4053B LM340L LMC555 TLV9101
    When the Sun is shining and illumination is needed inside a dimly lit interior space, a popular, proven, and highly efficient solution is to utilize the energy of available sunlight in the simplest and most sustainable fashion conceivable: Opening ...
    Jul 2, 2024
92. RC-timed shutoff function uses op amp and momentary switch
    Glen Chenier
    Circuits Measurement Supply Texas Instruments LMC6482
    Battery-operated instrument benefited from auto-power shutdown A handheld, battery-operated “fiber finder” measures the light escaping from an optical fiber when clamped in a V-shaped block under slight pressure. A pair of photodiodes ...
    Jul 2, 2024

93. Portable thermal anemometer hot-transistor bias compensation nulls battery discharge droop
    Stephen Woodward
    Circuits Measurement Texas Instruments LM393
    All thermal anemometers work by inferring air speed from measurements of thermal impedance (Z) between a heated sensor and the surrounding air: (1) where P is the power dissipated by the sensor and T is the temperature difference between the sensor ...
    Jun 27, 2024
94. Ultra-low distortion oscillator. Part 2 - The real deal
    Nick Cornford
    Circuits Audio Oscillators Texas Instruments LM4562
    In Part 1 ( Ref. 1 ) of this article, we briefly looked at the Wien bridge oscillator before homing in on the bi-quad filter as our best candidate for an oscillator capable of giving 0.0001%/ 120 dB distortion, and showed its full circuit. Treating ...
    Jun 27, 2024
95. Ultra-low distortion oscillator. Part 1 - How not to do it
    Nick Cornford
    Circuits Audio Oscillators Texas Instruments LM4562
    Over the years, the Design Ideas (DI) column has featured many interesting oscillators, but none that I can recall was specifically designed to produce a really clean sine wave. Putting that omission together with the need to rebuild my old ...
    Jun 26, 2024
96. Solar constant lighting system uses PV-pushback-effect. Part 2 - System testing
    Vijay Deshpande
    Circuits Supply Light Solar Texas Instruments LM311
    Testing the system Testing was done at various sunlight intensities. For any given sunlight intensity, V PV , I PV , V M , I M , etc., are measured. Figure 5 shows the variation of PV power (P PVON ), converter power (P M ), and total power (P TOT ...
    Jun 10, 2024
97. Solar constant lighting system uses PV-pushback-effect. Part 1 - System description
    Vijay Deshpande
    Circuits Supply Light Solar Texas Instruments LM311
    The PV-pushback-effect with solar panels can control backup power and provide constant light output. Solar day lamps (SDLs) are made by simply connecting an LED array to a solar photovoltaic (PV) panel. SDLs represent a highly cost-effective way of ...
    Jun 6, 2024
98. 2×AA/USB: OK!
    Nick Cornford
    Circuits Supply Texas Instruments LM1117
    While an internal, rechargeable lithium battery is usually the best solution for portable kit nowadays, there are still times when using replaceable cells with an external power option, probably from a USB source, is more appropriate. This DI shows ...
    May 28, 2024
99. Improve thermal airflow sensor PSRR with just two resistors
    Stephen Woodward
    Circuits Analogue Design Measurement Texas Instruments LM10
    Self-heated transistors used as thermal air flow sensors are a particular (obsessive?) interest of mine, and over the years I must have designed dozens of variations on this theme. Figure 1 illustrates one such topology seen here (Reference 1) ...
    May 27, 2024
100. Double and invert 5 V to generate ±10 V using two generic chips and two bootstraps
     Stephen Woodward
     Circuits Analogue Design Supply Texas Instruments CD4053BE
     Integration of analog circuitry with digital logic often requires the addition of an extra supply rail or two. The excellent PSRR of precision op-amps (typically 100 dB) makes them unfussy about power rail variations. This simplifies power supply ...
     May 23, 2024

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