Circuits & Schematics Texas Instruments - 5

41. Lowering quiescent current by a factor of 4 in an electronic latching switch
    Francesc Casanellas
    Circuits Supply Digital Texas Instruments CD4013B CD4093B
    The circuit in Figure 1 shows an electronic switch driven by a momentary pushbutton, which turns the power alternately on and off. It was designed for battery-powered equipment. The easiest way to implement it is to use a flip-flop IC, such as the ...
    Feb 26, 2024
42. "Sub-zero" op-amp regulates charge pump inverter
    Stephen Woodward
    Circuits Analogue Design Supply Texas Instruments TLV9064
    Avoiding op-amp output saturation error by keeping op-amp outputs “live” and below zero volts is a job where a few milliamps and volts (or even fractions of one volt) of regulated negative rail can be key to achieving accurate analog ...
    Feb 9, 2024

43. Direction detector doubles as decoder
    Tracy Allen
    Circuits Measurement Beginners Digital Texas Instruments CD4093B
    Fig 1’s circuit, which was developed to monitor the traffic of bumblebees into and out of the hive, differentiates “a-to-b” motion from “b-to-a” motion. When used with an optical decoder, the circuit distinguishes ...
    Feb 1, 2024
44. RLD-based astable 555 timer circuit
    Arthur Edang Maria Lourdes Lacanilao-Edang
    Circuits Oscillators Texas Instruments LM555CN
    In the classic configuration and most variants of the astable 555 multivibrator circuit, the timing characteristics are based on the charging and discharging of a capacitor. However, it can be argued that since the exponential voltage of a ...
    Jan 26, 2024
45. More gated 555 astable multivibrators hit the ground running
    Stephen Woodward
    Circuits Oscillators Texas Instruments LM555 LMC555
    A previous Design Idea “Gated 555 astable hits the ground running” ( Ref. 1 ) offered a fix for the problem of the excessively long first pulse that’s generated by traditional topology 555 astable circuits on start up when gated ...
    Jan 23, 2024
46. Simple log-scale audio meter
    Nick Cornford
    Circuits Audio Measurement Texas Instruments TL081
    While refurbishing an ageing audio mixer, I decided that the level meters needed special attention. Their rather horrible 100 µA edgewise movements had VU-type scales, the drive electronics being just a diode (germanium?) and a resistor. ...
    Jan 22, 2024
47. Gated 555 astable hits the ground running
    Stephen Woodward
    Circuits Oscillators Texas Instruments LMC555 SN74HC04
    The classic and versatile 555 finds its way into many low to moderate frequency oscillator applications. Some of these require the ability to selectively gate oscillation on and off on demand and the 555’s RESET pin can conveniently be used ...
    Jan 18, 2024
48. A simple, accurate, and efficient charge pump voltage inverter for $1 (in singles)
    Stephen Woodward
    Circuits Supply Texas Instruments CD4053B
    Keeping op-amp outputs “live” at and below zero volts, generating symmetrical output signals, and processing bipolar analog inputs, are all examples of design situations where a few milliamps of negative voltage rail can be a necessity. ...
    Jan 10, 2024
49. Squashed triangles: sines, but with teeth? Part 2
    Nick Cornford
    Circuits Oscillators Texas Instruments LM393 TL081 TLV237x
    Second test circuit I looked at several types of AGC circuits (strictly, Automatic Level Control). JFETs are the usual starting-point but are inherently non-linear and need to be surrounded by lots of stuff to limit the signal voltage across them ...
    Jan 9, 2024
50. Squashed triangles: sines, but with teeth? Part 1
    Nick Cornford
    Circuits Oscillators Texas Instruments LM393 TL081 TLV237x
    A while ago, I needed (or wanted) a pocket-sized audio sine-wave generator: simple, stable, repeatable, single-gang control pot, 9 V battery-powered. A “squashed tri-wave” approach looked appropriate. While the principle is easy make a ...
    Jan 8, 2024

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