Circuits & Schematics Texas Instruments - 4

31. Non-linear pullup for multi-rate I²C buses
    Christopher Paul
    Circuits Interfaces Microcontrollers Usage Texas Instruments SN74LVC2G66 SN74LVC74APWR TLV3202
    I 2 C is a popular bidirectional serial communications bus having a clock and a data line. Both line’s drivers consist of an open drain ground-referenced N-channel MOSFET with a pullup resistor connected to a supply ranging from 1.8 V to 5 V. ...
    May 13, 2024
32. Adaptable pullup
    Peter Demchenko
    Circuits Interfaces Texas Instruments TS5A3159
    It’s common for I 2 C systems to have both standard and fast devices on the same bus. For I 2 C systems, the speed and power consumption both depend on the values of pullup resistors: the values of them should be low enough to secure the fast ...
    Apr 24, 2024

33. A new and improved latching power switch. Part 2
    Circuits Supply Texas Instruments LM393 TLC393
    Although adequate for undemanding applications, the circuit suffers from several drawbacks which may limit its suitability. The Darlington’s current gain (which can vary considerably from device to device and with temperature) plays a ...
    Apr 5, 2024
34. 15-bit voltage-to-time ADC for "Proper Function" anemometer linearization
    Stephen Woodward
    Circuits Measurement Signal Processing, Filters Texas Instruments LMC555
    Awhile back I published a simple design idea for a thermal airspeed sensor based on a self-heated Darlington transistor pair (Ref, 1). The resulting sensor is simple, sensitive, and solid-state, but suffers from a radically nonlinear airspeed ...
    Apr 4, 2024
35. A new and improved latching power switch. Part 1
    Anthony Smith
    Circuits Supply Texas Instruments LM393 TLC393
    A previous Design Idea [ 1 ] outlined a relatively simple circuit in which a momentary pushbutton could be made to function like a latching, mechanical switch. The article generated a good deal of reader feedback. Amongst other comments, readers ...
    Mar 28, 2024
36. Supersized log-scale audio meter
    Nick Cornford
    Circuits Audio Measurement Texas Instruments TL084 LM385
    At the end of the DI for a Simple log-scale audio meter (Ref. 1), I promised to show how to upgrade it to work better. With these fixes, it now has near-digital performance, with faster response and smoother operation. Even this supersized version ...
    Mar 21, 2024
37. Efficient voltage doubler is made from generic CMOS inverters
    Stephen Woodward
    Circuits Supply Texas Instruments SN74AC14
    When a design needs auxiliary voltage rails and the associated current loads are modest, capacitor pump voltage multipliers are often the simplest, cheapest, and most efficient way to make them. The simplest of these is the diode pump voltage ...
    Mar 14, 2024
38. Voltage inverter uses gate's output pins as inputs and its ground pin as output
    Stephen Woodward
    Circuits Supply Texas Instruments SN74AC14 CD40106B
    When analog circuits mix with digital, the former are sometimes dissatisfied with the latter’s usual single supply rail. This creates a need for additional, often negative polarity, voltage sources that are commonly provided by capacitive ...
    Mar 13, 2024
39. Logic Probe has a wide voltage range
    Peter Demchenko
    Circuits Measurement Texas Instruments SN74HC132 SN74HC14
    The logic probe is powered from the device under test (DUT) it may be any binary logic, which can be powered in the range +2 V to +6 V. This may be a microcontroller or 74/54 series logic chips, including HC/HCT chips. The probe determines 3 ...
    Mar 7, 2024
40. ∆Vbe differential thermometer needs no calibration
    Stephen Woodward
    Circuits Analogue Design Measurement Texas Instruments CD4053B TLV2374
    Differential temperature measurement is a handy way to quantify the performance of heatsinks, thermoelectric coolers (TECs), and thermal control in electronic assemblies. Figure 1 illustrates an inexpensive design for a high-resolution differential ...
    Mar 6, 2024

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