Circuits & Schematics ON Semiconductor - 4

31. Audible ohmmeter cuts down on false readings
    Circuits Measurement ON Semiconductor 2N6028
    One of my go-to diagnostic tools is a simple home-brew audible ohmmeter (AudOhm). This circuit has served me well for many years, allowing “heads up” testing of wiring harnesses and control equipment, and various components such as ...
    May 13, 2021
32. Add gain to an absolute-value amplifier
    Chuck Wojslaw
    Circuits Measurement Amplifiers ON Semiconductor CAT5113
    The absolute-value amplifier is a basic building block in test-and-measurement and signal-processing applications. The addition of a DPP (digitally programmable potentiometer) adds another dimension, G (gain), to this key circuit. Because the gain ...
    Apr 13, 2021

33. Switch debouncer uses only one gate
    Circuits Digital ON Semiconductor NC7SZ04
    The circuit in Figure 1 produces a single debounced pulse each time you press S 1 . Moreover, the circuit uses only logic power from the remote pull-up resistor, R 2 . You can use the circuit to detect when a key is pressed in a nonenergized ...
    Mar 9, 2021
34. Get just enough boost voltage
    Circuits Supply ON Semiconductor CS5171
    Adding a current-mirror circuit to a typical boost circuit allows you to select the amount of boost voltage and to ensure a constant difference between the input and the output voltages (Figure 1). This circuit is useful for high-side-drive ...
    Feb 10, 2021
35. Where is the wiper?
    Chuck Wojslaw
    Circuits Digital ON Semiconductor CAT5113 CAT5114
    You enjoy significant advantages when using DPPs (digitally programmable potentiometers) with increment/decrement serial interfaces. Programming the serial interface is simple and fast, and you can adjust the potentiometer in real-time ...
    Jan 20, 2021
36. DPPs make nonvolatile microvolt DAC
    Stephen Woodward
    Circuits Measurement ON Semiconductor CAT5113
    The availability of a seemingly limitless variety of monolithic DAC chips makes it easy to implement most digital-to-analog-conversion applications with a single off-the-shelf device. Sometimes, an unusual set of requirements necessitates a ...
    Dec 21, 2020
37. P-channel power-MOSFET driver uses unity-gain op amp
    Circuits Analogue Design Power ON Semiconductor MC33072 PN200A BD135G BD136G
    P-channel MOSFETs can simplify designs when you use them as high-side switches on circuits with voltages exceeding 100 V dc. When driving a MOSFET, you must rapidly charge and discharge the input capacitance between its gate and its source to ...
    Nov 10, 2020
38. Enhanced Circuit Yields Versatile, Efficient Switch-Mode Solenoid/Relay Driver
    Stephen Woodward
    Circuits Power ON Semiconductor LM339
    In this Idea for Design, using a comparator-based switch-mode driver circuit of a solenoid improves efficiency by tailoring the drive to the pull-in versus hold-mode current requirements. Several years ago, Paul Rako, in collaboration with the ...
    Oct 25, 2020
39. Power-supply interrupter fights ESD-induced device latch-up
    Circuits Analogue Design Supply ON Semiconductor MOC211M BSS138
    EDN Under certain conditions, ESD events can damage digital circuits by causing latch-up. For example, when ESD triggers them, parasitic transistors normally formed as parts of a CMOS device can behave as an SCR (silicon-controlled rectifier). Once ...
    Oct 12, 2020
40. Test continuity with an LED
    Raju Baddi
    Circuits Measurement ON Semiconductor BC549
    You sometimes need to know whether a resistance exceeds a preset limit. The continuity tester in Figure 1 lets you determine that fact for resistances of 0.5 Ω to 10 kΩ. The heart of the circuit is the transistor pair comprising Q 1 and ...
    Jul 21, 2020

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