Circuits & Schematics: Design - 8

71. Voltage inverter design idea transmogrifies into a 1MHz VFC
    Stephen Woodward
    Circuits Analogue Design Measurement NXP 74HC4053
    It’s interesting, useful, and fun that basic electronic topologies often turn out to have utility in multiple and surprisingly different applications. Figure 1 shows an example of such a circuit. It’s a charge pump voltage inverter ...
    Jul 18, 2024

72. Precision programmable current source uses two ICs
    Pietro Oliva Stefano Salvatori
    Circuits Analogue Design Supply Analog Devices LT1991 LT1995 LT1996
    .. Design Idea mates a precision current source IC with precision difference amp chips to create a programmable current ...
    Jul 17, 2024

73. Monitor a differential pair for valid & fault conditions
    Budge Ing
    Circuits Interfaces Analog Devices MAX3280E
    .. is advantageous to know if there is a valid signal on a differential signal bus. This Design Idea detects differential data transmission and reports a loss of signal (LOS) to a microcontroller or other ...
    Jul 11, 2024
74. Solar day-lamp with active MPPT and no ballast resistors
    Stephen Woodward
    Circuits Supply Solar Texas Instruments CD4053B LM340L LMC555 TLV9101
    .. panel and still be bright enough to be useful, puts a premium on achieving high efficiency for both conversion steps. This design idea (see the Figure 1) presents some ways to achieve these design imperatives. Figure 1. Solar day lamp with ...
    Jul 2, 2024
75. RC-timed shutoff function uses op amp and momentary switch
    Glen Chenier
    Circuits Measurement Supply Texas Instruments LMC6482
    .. before cutting and splicing, thus avoiding accidental outages. With no room on the front panel for a power switch, the design requires a sliding clamp mechanism to turn the unit on at its extreme travel position when an operator ...
    Jul 2, 2024
76. Ultra-low distortion oscillator. Part 1 - How not to do it
    Nick Cornford
    Circuits Audio Oscillators Texas Instruments LM4562
    .. the years, the Design Ideas (DI) column has featured many interesting oscillators, but none that I can recall was specifically ...
    Jun 26, 2024
77. Analog comparator recognizes three signal relations
    Glen Chenier
    Circuits Analogue Design Measurement Intersil ICL7650S
    .. when the photodiodes respond with signal levels closer together. The desired thresholds are dependent on the mechanical design of the optical clamp which is beyond the scope of this DI. If no signals are present in either direction, ...
    Jun 20, 2024
78. "Brick-wall" lowpass audio filter needs no tuning
    Diego Puyal Pilar Molina
    Circuits Analogue Design Audio STMicroelectronics LF347
    .. a lowpass filter with a steep frequency-cutoff characteristic, an engineer can opt for a “brick-wall”- filter design that features a sharp transition band. For example, in an FM stereophonic-broadcast system, the lowpass ...
    Jun 17, 2024
79. One microcontroller pin drives two LEDs with low quiescent current
    Antonio Muñoz Arturo Mediano
    Circuits Microcontrollers Usage Nexperia BZX84
    .. basis for this Design Idea is a circuit that uses three resistors and a microcontroller-I/O pin to work as input high impedance or ...
    Jun 11, 2024
80. Simple circuit converts 5V to -10 V
    Ken Yang
    Circuits Supply Analog Devices MAX889
    .. typical switched-capacitor charge pump requires no inductors, is easy to design, and can double a positive voltage or convert a positive voltage to an equivalent negative voltage. However, ...
    Jun 10, 2024

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