Circuits & Schematics Texas Instruments

1. Single IC forms sensitive modulated light receiver
   David A. Johnson
   Circuits Measurement Light Texas Instruments CD4069UB
   The circuit uses a very inexpensive C-MOS IC that is connected to a small photodiode. Using a unique inductive feedback network, the circuit provides high sensitivity under high ambient light conditions. It is a great circuit when you want to ...
   Mar 6, 2026
2. Simple shorts sniffer
   Stephen Woodward
   Circuits Measurement Printed Circuit Boards (PCB) Texas Instruments TLV9052
   Recently, frequent and favorite contributor Nick Cornford gave us a cool and novel acoustic-interface design for a super sub-ohmmeter capable of audibly sniffing out defects in PWBs: “Tuneful track-tracing” ( Ref. 1 ). Figure 1’s ...
   Feb 25, 2026

3. Silly simple supply sequencing
   Stephen Woodward
   Circuits Supply Texas Instruments CD40106B
   Frequent contributor R. Jayapal recently shared an interesting Design Idea (DI) for power supply control and sequencing in MCU-based applications that combine analog and digital circuitry: “Short push, long push for sequential operation of ...
   Feb 23, 2026
4. Full circle current loops: 4 mA-20 mA to 0 mA-20 mA
   Stephen Woodward
   Circuits Analogue Design Measurement Interfaces Texas Instruments TLV431
   A topic that has recently drawn a lot of interest (!) and no fewer than four separate design articles (!!) here in Design Ideas, is the conversion of 0 to 20 mA current sources into industrial standard 4 mA to 20 mA current loop signals. ...
   Feb 13, 2026
5. IR distance ranger covers 1 to 20 cm
   Paul C Florian
   Circuits Measurement Texas Instruments LM555 TLV2252
   Commercially available IR distance rangers typically handle a 3- to 30-in. detection distance. Many times, it is necessary to determine smaller distances. The circuit in Figure 1 is useful for measuring small distances to reflective surfaces. Its ...
   Feb 11, 2026
6. Classic constant current cascode
   Stephen Woodward
   Circuits Measurement Supply Texas Instruments TL431
   An important figure of merit for all precision constant current sources is their active impedance. Which is to say, just how “constant” is their output held against changes in applied voltage? Frequent and expert Design Idea (DI) ...
   Feb 5, 2026
7. Tune 555 frequency over 4 decades
   Stephen Woodward
   Circuits Oscillators Texas Instruments LMC555
   The versatility of the venerable LMC555 CMOS analog timer is so well known it’s virtually a cliche, but sometimes it can still surprise us. The circuit in Figure 1 is an example. In it a single linear pot in a simple RC network sets the ...
   Jan 29, 2026
8. Ignoring the regulator's reference redux
   Christopher Paul
   Circuits Analogue Design Supply Texas Instruments OPA2383 REF35 SN74AC04 TLV9151
   Stephen Woodward’s “Ignoring the regulator’s reference” ( Ref. 1 ) Design Ideas (DI) (see Figure 1) is an excellent, working example of how to include a circuit in the feedback loop of an op amp to support the stabilization ...
   Jan 21, 2026
9. Extend the LM358 op-amp family's output voltage range
   Christopher Paul
   Circuits Analogue Design Texas Instruments LM258 LM358
   The LM358 family of dual op amps is among those hoary industry work-horse devices that are inexpensive and still have their uses. These parts’ outputs can approach (and for the inputs even include) their negative supply rail voltage. ...
   Jan 18, 2026
10. Simple speedy single-slope ADC
    Stephen Woodward
    Circuits Measurement Microcontrollers Usage Texas Instruments LM4041N TS5A3160
    Ages ago, humankind crawled out of the primordial analog ooze and began to do digital. They soon noticed and quantified a fundamental need to interconnect their new quantized numerical novelties with the classic continuum of the ancestral ...
    Jan 12, 2026

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