Circuits & Schematics Texas Instruments - 3

21. To press on or hold off? This does both
    Nick Cornford
    Circuits Analogue Design Supply Texas Instruments CD4060B
    Let’s imagine that you need to add a power switch to something that’s battery-powered but processor-free; perhaps it must also be waterproof and thus membrane-sealed. Or perhaps you just want to use a shiny modern push-button rather ...
    Oct 16, 2024
22. CMOS gate makes long-duration timers using RC components
    Raju Baddi
    Circuits Oscillators Texas Instruments CD4011B
    The CD4011 CMOS NAND gate has a typical input current of 10 pA at room temperature. You can charge a capacitor connected to the gate input with currents on the order of hundreds of picoamperes and neglect the influence of the gate-input current on ...
    Oct 15, 2024

23. Comparator directly controls power-MOSFET gate
    Peter Demchenko
    Circuits Analogue Design Texas Instruments LM193 LM7815
    It is common practice to power a MOSFET with a comparator and with an unregulated voltage and to power the comparator driving it from a regulated one (Figure 1). Many loads are insensitive to driving voltage, so it would be a waste of money and ...
    Oct 14, 2024
24. DC power wire also carries clock or data
    Mike Hardwick
    Circuits Interfaces Supply Texas Instruments LMC7211-N
    A high-side current-sense amplifier, IC 1 , offers a simple method of combining low-speed clocks or other signals with dc power in cables between subsystems (Figure 1). Designed for monitoring charge and discharge current in secondary batteries, IC ...
    Oct 3, 2024
25. 20MHz VFC with take-back-half charge pump
    Stephen Woodward
    Circuits Measurement Texas Instruments SN74AC14 TLV9161
    Way back in 1986, famed analog innovator Jim Williams, in “Designs for High Performance Voltage-to-Frequency Converters” ( Reference 1 ) published his “King Kong” 100 MHz VFC. I have never seen its equal. Certainly Figure ...
    Sep 30, 2024
26. Long delay timer sans large capacitors
    Jayapal Ramalingam
    Circuits Oscillators Texas Instruments LM555 CD4011B CD4017B CD4020B
    There are several applications at home or industry for long delay timers (ON or OFF delay). Time delays on the order of seconds can be generated using 555 timer circuits, provided the timing capacitor values do not exceed the limit specified by 555 ...
    Sep 26, 2024
27. DIY RTD for a DMM
    Nick Cornford
    Circuits Measurement Texas Instruments LM385-1.2
    Psychologists tell us that frustration increases drive. I was driven to produce the circuit in this design idea by my increasing frustration with a collection of digital thermometers, all of which claimed accuracy to within 0.1 C but the readings ...
    Sep 25, 2024
28. Brute force mitigation of PWM VDD and ground "saturation" errors
    Stephen Woodward
    Circuits Measurement Microcontrollers Usage Texas Instruments TLV9162 SN74AC04
    An excerpt from Christopher Paul’s “Parsing PWM (DAC) performance: Part 1 Mitigating errors” ( Ref. 1 ): “I was surprised to discover that when an output of a popular µP I’ve been using is configured to be a ...
    Sep 23, 2024
29. Microcontroller supervises 0- to 20-mA protection circuit
    Anatoly Andrusevich
    Circuits Interfaces Microcontrollers Usage Texas Instruments SN74LVC1G02 SN74LVC1G32 SN74LVC1G74
    The 0- to 20-mA current loop is a reliable means of data communication in industrial applications. These circuits use a precision shunt in the receiver to convert the current signal into a voltage signal. Accidentally connecting the precision ...
    Aug 29, 2024
30. Visual overload alert
    Nick Cornford
    Circuits Audio Texas Instruments LM393
    Despite the title, this DI does not describe a gadget to tell you when to don your shades, but instead features a useful add-on to (analog) audio kit. Built into a mixer, for example, it will show when the output of any stage is approaching ...
    Aug 6, 2024

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