Circuits & Schematics Texas Instruments

1. Revisited: Three discretes suffice to interface PWM to switching regulators
   Stephen Woodward
   Circuits Supply Microcontrollers Usage Texas Instruments TPS62933
   The typical regulator output network Many voltage regulator chips, both linear and switching, use the same basic two-resistor network for output voltage programming. Figure 1 illustrates this feature in a typical switching (buck type) regulator, ...
   Jun 2, 2025
2. A single op-amp solution to stabilize laser output
   Anirban Chatterjee
   Circuits Laser Microcontrollers Usage Texas Instruments OPA551
   Semiconductor laser diodes (SLDs) are often packaged with a photodiode. The output current from this photodiode can be monitored to regulate the output power intensity of the laser diode. SLDs, however, are prone to pathological drifts, such as ...
   May 29, 2025

3. A two-way mirror - current mirror that is
   Stephen Woodward
   Circuits Analogue Design Oscillators Texas Instruments LMC555
   One classic set you’ll see in most гvintage mystery movies is an interrogation room with a “two-way” mirror in one wall. This cool gadget lets the witnesses see the suspects from another room while the suspects can see only ...
   May 22, 2025
4. Seven-octave linear-in-pitch VCO
   Stephen Woodward
   Circuits Oscillators Texas Instruments LMC555 SN74HCT74
   Frequent contributor Nick Cornford recently shared design ideas incorporating cool circuits for linear-in-pitch voltage-controlled oscillators (LPVCOs): Revealing the infrasonic underworld cheaply: Part 1 ( Ref. 1 ) and Part 2 ( Ref. 2 ) A ...
   May 21, 2025
5. Another PWM controls a switching voltage regulator
   Christopher Paul
   Circuits Supply Texas Instruments SN74LVC2G14 SN74LVC14A TLV333
   A recent Design Idea, “Three discretes suffice to interface PWM to switching regulators”( Reference 1 ), demonstrated one way to use PWM to control the output of a typical switching voltage regulator. There were some discussions in the ...
   May 20, 2025
6. A simple circuit to let you characterize JFETs more accurately
   Cor van Rij
   Circuits Analogue Design Measurement Texas Instruments TL071A
   In April 2012, EDN published a circuit by John Fattaruso ( Ref. 1 ) that lets you quickly measure the drain-source saturation current and the pinch-off voltage of both an N-JFET and a P-JFET. The pinch-off voltage (V P ) is measured by inserting a ...
   May 15, 2025
7. Converting square-waves into saw-teeth
   Stephen Woodward
   Circuits Oscillators Texas Instruments CD74HC4053 TLV2371
   Generating analog sawtooth waveforms (linear ramp followed by a quick reset to zero) from digital timing signals is a common function. It usually requires a negative supply as sketched in Figure 1, where Negative current through R1 ramps up ...
   May 12, 2025
8. Circuit delivers constant power to a load
   Kiril Karagiozov
   Circuits Supply Texas Instruments NE555
   If you have a load with a variable or poorly specified resistance and want to regulate the power applied to it (a heater for example), merely controlling the voltage or current will not work, as in both cases the power P = I 2 R = V 2 /R depends on ...
   Apr 29, 2025
9. Another simple flip ON flop OFF circuit
   Jayapal Ramalingam
   Circuits Supply Texas Instruments CD4024B CD40106B
   Figure 1 gives a simple circuit for the PUSH ON, PUSH OFF function with only a few inexpensive components. In this design, the output is connected to the input of the gadget when you press the push button (PB) once. For the next push, the output is ...
   Apr 28, 2025
10. 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

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