Circuits & Schematics: frequency meter - 6

51. LED-current limiter accepts ac or dc
    Circuits Supply Light Microchip MIC5209
    .. 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 destroy your LEDs. In this ...
    18-07-2023

52. Circuit converts DAC's outputs from single-ended to differential mode
    Circuits Signal Processing, Filters Analog Devices AD5424 AD8042
    .. offers 100-pA maximum bias current at room temperature and 5-µV maximum input-offset voltage. The op amp's low-frequency noise is important in precision level-setting applications, and the AD8628 specifies 0.1- to 10-Hz ...
    13-07-2023

53. How to recover a pulse signal with a large capacitance load
    Circuits Signal Processing, Filters Digital Texas Instruments OPA365 SN7407 TLV3501
    .. typically have high capacitance, which can significantly affect the signal’s wave shape. As such, the signal’s frequency and duty cycle needs to be maintained, if it is to remain free from distortion. This article discusses ...
    10-07-2023
54. Bootstrap biasing of high input voltage step-down controller increases converter efficiency
    Circuits Supply Analog Devices LTC3890 LTC3891
    .. Q1 and Q2 are biased from INTV CC and output voltage V OUT is stepped up to 5 V, which feeds EXTV CC . The multivibrator frequency, f, is set at 50 kHz to minimize the EMI signature. The pulse width is defined by the ratio of ...
    05-07-2023
55. Complementary-pair dc/dc converter simultaneously doubles, inverts supply voltage
    Circuits Supply ON Semiconductor BCP56 MBRS1100
    .. using D 3 and C 3 generate the doubler’s output. Table 1. Experimental results Input voltage (V) Input current (mA) Frequency (kHz) Voltage doubler (V) Current doubler (mA) Negative voltage (V) Negative current (mA) Input power ...
    29-06-2023
56. Broadband random noise generator
    Circuits Oscillators Measurement Analog Devices LT1004 LT1006 LT1013 LT1226 LT1228
    .. overall output level control. Figure 2. Figure 1’s output in the 1 MHz filter position. Figure 3. Amplitude vs frequency for the random noise generator is essentially flat to 1 MHz. Figure 2 shows noise at 1 MHz bandpass, ...
    27-06-2023
57. 3.3V powered V/F converter
    Circuits Measurement Analog Devices LT1017 LT1034 LTC1043
    .. the 120 pF positive feedback path decays, A1’s output returns positive and the entire cycle repeats. The oscillation frequency of this action is directly related to the input voltage. Figure 1. 3.3 V powered voltage-to-frequency ...
    26-06-2023
58. Constant-voltage load box for battery simulation
    Circuits Measurement Supply Analog Devices LT1211
    .. an LT1004-1.2 and reducing R1, the reference bias resistor, to 1k. The 510 Ω and 1.1k resistors are required for high frequency stability; they suppress a 1 MHz oscillation. The 1N5400 diode and 4-amp fuse protect the circuit from ...
    22-06-2023
59. Battery internal resistance meter
    Circuits Measurement Supply Analog Devices LT1077 LTC1150 LTC1798 LTC6943
    .. from the 2.5 V reference driven resistor string. S1’s 0.5 Hz square wave switching drive comes from the CD4040 frequency divider. The result of this action is a 100 mA biased 1 A 0.5 Hz square wave load applied to the ...
    22-06-2023
60. Nonlinearities of Darlington airflow sensor and VFC compensate each other
    Circuits Measurement Texas Instruments LM10 LMC555
    .. temperature. Rising ambient temperature causes Q1’s rising collector current to speed up U1’s oscillation frequency by just that factor. So. Kudos to Q1. ADDENDUM: Konstantin Kim’s klever komment Konstantin Kim ...
    21-06-2023

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