Circuits & Schematics: Design - 7

61. Fast-settling picoammeter circuit handles wide voltage range
    Rob Whitehouse
    Circuits Analogue Design Measurement Analog Devices AD795 OP1177
    .. an unknown current from a feedback current and delivers an output voltage proportional to the unknown current In this design, the input's dc resistance consists mostly of R 2 and IC 1 ’s effective input resistance, or ...
    Feb 22, 2024

62. Transistors offer thermal protection for controller
    Christophe Basso
    Circuits Supply ON Semiconductor NCP1200
    .. that's higher than ambient by a few tens of degrees. To overcome this problem, you can implement a thermistor-based design, but this solution compromises the system's cost. Fortunately, you can use standard bipolar transistors ...
    Feb 21, 2024

63. Multiple power supplies fortify high-side gate control
    Steven Hendrix
    Circuits Supply Microchip MIC4680
    .. a recent design project, a robust power supply was needed to control the gates of high-side FETs. Optocouplers readily ...
    Feb 14, 2024
64. ±5V converter uses off-the-shelf surface mount coil
    Kevin Vasconcelos Mitchell Lee
    Circuits Supply Linear Technology LT1176
    .. wound coil with heavy gauge wire for the main 5 V output and smaller wire for the overwinding. To avoid a custom coil design, an off-the-shelf JUMBO-PACTM quadrifilar wound coil is used. This family of coils is wound with 1:1:1:1 ...
    Feb 5, 2024
65. Using an inductor to improve an existing design
    Peter Demchenko
    Circuits Supply Analog Devices ADR444
    Here is the circuit in Figure 1 from a previous DI ( Ref. 1 ): Figure 1. Simple local low-noise voltage converter that can be used when a simple negative supply of low voltage is required. It is simple, and its efficiency can be improved by a very ...
    Jan 31, 2024
66. RLD-based astable 555 timer circuit
    Arthur Edang Maria Lourdes Lacanilao-Edang
    Circuits Oscillators Texas Instruments LM555CN
    .. , and measurements for V O . References Arthur Edang. “Inductor-based astable 555 timer circuit.“ Phil Rogers. Design low-duty-cycle timer circuits. Materials on the topic Datasheet Texas Instruments LM555CN/NOPB
    Jan 26, 2024
67. Control a processor's power supply in real time
    Yogesh Sharma
    Circuits Supply Microcontrollers Usage Analog Devices AD5258 ADP3051
    .. IC 1 ’s feedback input rests at 0.8 V, and IC 2 and R 2 form a voltage divider. The ADSP-BF531 imposes several design requirements: Its core power-supply voltage must maintain its accuracy to within 25 mV and offer an ...
    Jan 25, 2024
68. More gated 555 astable multivibrators hit the ground running
    Stephen Woodward
    Circuits Oscillators Texas Instruments LM555 LMC555
    .. previous Design Idea “Gated 555 astable hits the ground running” ( Ref. 1 ) offered a fix for the problem of the ...
    Jan 23, 2024
69. Simple log-scale audio meter
    Nick Cornford
    Circuits Audio Measurement Texas Instruments TL081
    .. log of the input signal. Positive input half-cycles cause it to clamp low at V F , which we ignore, as this is a half-wave design; for negative ones, it swings high by 2V F . Driving that 2V F through another diode into the capacitor ...
    Jan 22, 2024
70. Gated 555 astable hits the ground running
    Stephen Woodward
    Circuits Oscillators Texas Instruments LMC555 SN74HC04
    .. comparable to a 74HC04. Figure 5. A buffer may be necessary to provide a full voltage excursion RESET signal. Oscillator design equations are unchanged from the usual 555 datasheet math, except that the timing capacitance used should be ...
    Jan 18, 2024

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