Circuits & Schematics Texas Instruments - 4

31. 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
32. 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

33. Flip ON flop OFF without a flip/flop
    Stephen Woodward
    Circuits Supply Texas Instruments CD4069UB
    There’s been a lot of interesting conversation and DI teamwork lately devising circuits for ON/OFF power control using inexpensive momentary-contact switches (See Ref. 1 Ref. 4 ). Most of these designs have incorporated edge triggered ...
    Apr 7, 2025
34. Dual comparators match precision industrial, instrumentation application needs
    Tim Davis
    Circuits Analogue Design Measurement Texas Instruments LM359
    Dual precision comparators are needed in many designs, such as for industrial and instrumentation applications, to generate accurate pulse-width modulated (PWM) waveforms with very high ( 99%) and very low ( 1%) duty-cycle percentages. This design ...
    Apr 4, 2025
35. 100-MHz VFC with TBH current pump
    Stephen Woodward
    Circuits Measurement Texas Instruments CD74AC14 CD74AC74 CD74AC161 SN74LVC1G14 TLV9161
    Famous analog designer and author Jim Williams published an awesome design in 1986 for a 100-MHz voltage to frequency converter ( Ref. 1 ). He named this high-climber (picture it on the roof of the Empire State building swatting biplanes out of the ...
    Mar 25, 2025
36. Can a free running LMC555 VCO discharge its timing cap to zero?
    Stephen Woodward
    Circuits Analogue Design Oscillators Texas Instruments LMC555
    Frequent design idea (DI) contributor Nick Cornford recently published a synergistic pair of DIs “A pitch-linear VCO, part 1: Getting it going” ( Ref. 1 ) and “A pitch-linear VCO, part 2: taking it further” ( Ref. 2 ). The ...
    Mar 24, 2025
37. Use current-mirror biasing to avoid squegging in RF oscillators
    Madhu Siddalingaiah
    Circuits Oscillators Texas Instruments LM3046
    If you've ever designed an RF oscillator, you've probably encountered squegging. Sometimes called motor boating, squegging causes oscillators to start and stop at frequencies much lower than the frequency of interest. Viewed on an ...
    Mar 11, 2025
38. Three discretes suffice to interface PWM to switching regulators
    Stephen Woodward
    Circuits Supply Microcontrollers Usage Texas Instruments TPS54332
    It’s remarkable how many switching regulator chips use the same basic two-resistor network for output voltage programming. Figure 1 illustrates this feature in a typical (buck type) regulator. See R 1 and R 2 where: Quantitatively, the V ...
    Mar 7, 2025
39. Simple setup tests bit-error rate
    Israel Schneiderman
    Circuits Digital Texas Instruments LM393 SN74HC74 SN74HC86
    Traditionally, the reception quality of a digital receiver is expressed in terms of BER (bit-error rate). This figure is the proportion of received bit errors in a given period. Typically, you measure the BER in the lab by applying an RF signal, ...
    Mar 4, 2025
40. Flip ON flop OFF
    Stephen Woodward
    Circuits Digital Texas Instruments CD4013B
    Toggle, slide, push-pull, push-push, tactile, rotary, etc. The list of available switch styles goes on and on (and off?). Naturally, as mechanical complexity goes up, so (generally) does price. Hence simpler generally translates to cheaper. Figure ...
    Feb 6, 2025

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