Circuits & Schematics Texas Instruments

1. 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
2. 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

3. 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
4. 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
5. 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
6. 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
7. 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
8. A pitch-linear VCO. Part 2 - Taking it further
   Nick Cornford
   Circuits Audio Oscillators Texas Instruments CD4013B CD4015B CD4013B
   In Part 1, we saw how to make an oscillator whose pitch, as opposed to frequency, can be made proportional to a control voltage. In this second part, we’ll look at some alternative ways of arranging things for other possible applications. To ...
   Mar 14, 2025
9. 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
10. 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

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