Circuits & Schematics Microchip - 2

11. Synthesize precision Dpot resistances that aren't in the catalog
    Stephen Woodward
    Circuits Analogue Design Microchip MCP4141
    A silly simple and ubiquitous circuit network is a variable resistance consisting of the series connection of a manually adjusted rheostat-connected pot and fixed resistor shown in Figure 1. Figure 1. Classic variable resistance with the series ...
    Aug 7, 2024
12. Single supply 200kHz VFC with bipolar differential inputs
    Stephen Woodward
    Circuits Analogue Design Measurement Microchip LM4040
    Few methods for analog to digital conversion are more “mature” than the classic combination of a voltage-to-frequency converter (VFC) with a counter. VFC digitization is naturally integrating, so good noise rejection is inherent, as is ...
    Jul 24, 2024

13. Multiple power supplies fortify high-side gate control
    Steven Hendrix
    Circuits Supply Microchip MIC4680
    For a recent design project, a robust power supply was needed to control the gates of high-side FETs. Optocouplers readily translate the logic signals up to the correct control voltages to drive the FETs. However, to ensure that the FETs turn on ...
    Feb 14, 2024
14. RFL-class logic gates
    Thomas Scarborough
    Circuits Digital Microchip 2N7000
    This Design Idea describes a new class of logic gates, which we have named resistor-FET-logic, aka “RFL.” How do we know it is new? While FET switches are common today, we have been unable to find a similar resistor-FET-logic. Further, ...
    Dec 25, 2023
15. Low-cost precision adjustable current reference and application
    Stephen Woodward
    Circuits Measurement Supply Microchip LM4040
    Low-cost monolithic precision adjustable voltage references are available in multiple families from multiple manufacturers, but this isn’t true for adjustable precision current references. That’s unfortunate, because while most ...
    Oct 19, 2023
16. Light powers isolation amplifier
    Stephen Woodward
    Circuits Supply Light Amplifiers Microchip LMC7101
    Self-powered isolation amplifiers, which need no external isolated power supply, provide versatile and convenient interfaces in many applications that require galvanic isolation of the signal source. Examples of such applications include circuits ...
    Jul 27, 2023
17. LED-current limiter accepts ac or dc
    Roger Griswold
    Circuits Supply Light Microchip MIC5209
    LED drivers have lots of features and require plenty of external components. When your application requires no PWM (pulse-width-modulated) dimming or controlled frequency operation, your primary concern may be that too much current could damage or ...
    Jul 18, 2023
18. 300 volt, 4 second, self-calibrating Shannon decoder DAC
    Stephen Woodward
    Circuits High Voltage Measurement Microchip LM4040
    Besides its mind-boggling simplicity and programmable resolution, the chief attribute of the Shannon decoder DAC (SD) is speed ( Ref. 1 ), converting a serial n-bit digital stream into an analog signal in just nT seconds where T = 1 bit time. Of ...
    Jul 6, 2023
19. ±500 Volt Protection Circuit
    Circuits Measurement Microchip LND150N8-G
    Introduction A 500 V protection circuit for low voltage high impedance measuring instruments is shown in Figure 1. The protection is accomplished by limiting the amount of current going into the measuring instrument. The circuit will protect ...
    Dec 29, 2022
20. Piezoelectric Driver Finds Buzzer's Resonant Frequency
    Mehmet Efe Ozbek
    Circuits Measurement Microcontrollers Usage Microchip PIC18F452
    Piezoelectric buzzers find wide use as audible-signal generators because of their low power consumption and clear, penetrating sound. An external driver or a self-driven circuit that oscillates at the resonant frequency of the piezoelectric element ...
    Nov 17, 2022

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