All Sections Texas Instruments - 8

71. A simple circuit to let you characterize JFETs more accurately
    Cor van Rij
    Circuits 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
72. Converting square-waves into saw-teeth
    Stephen Woodward
    Circuits 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

73. A high-performance current source
    Christopher Paul
    Articles Texas Instruments LM317A
    The ever innovative and prolific Mr. Woodward has offered “PWM-programmed LM317 constant current source” [ 1 ], an intriguing programmable constant current source which elicited a lively conversation in its comments section. A Zen ...
    May 7, 2025
74. Circuit delivers constant power to a load
    Kiril Karagiozov
    Circuits 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
75. Another simple flip ON flop OFF circuit
    Jayapal Ramalingam
    Circuits 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
76. Simple logic probe uses bicolor LED
    Mark Shill
    Circuits 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
77. Reduce EMI by sweeping a power supply's frequency
    John Betten
    Circuits 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
78. Photo tachometer sensor accommodates ambient light
    Stephen Woodward
    Circuits 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
79. Flip ON flop OFF without a flip/flop
    Stephen Woodward
    Circuits 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
80. Dual comparators match precision industrial, instrumentation application needs
    Tim Davis
    Circuits 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

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