Circuits & Schematics: frequency meter - 9

81. Finely tune the hue of blue-light sources
    Circuits Light Analog Devices AD5228 AD590JR AD8602ARM-REEL
    .. a periodic change of the hue. If you set the Preset high and hold the /PU pin low while feeding a 50%-duty-cycle, 0.05-Hz-frequency logic waveform to the /PD pin, you get a slow, periodic, quasicontinuous “waving” of the ...
    14-03-2023

82. A single cell laser diode driver using the LT1110
    Circuits Supply Linear Technology LT1110
    .. R2 to the 212 mV reference. The amplifier drives Q1, which modulates current into the I LIM pin. This varies oscillator frequency to control average current. Overall frequency compensation is provided by R1 and C1, values carefully ...
    10-03-2023

83. 90 µA Precision Voltage-to-Frequency Converter
    Circuits Analogue Design Measurement Texas Instruments LM334
    .. 1 is a micropower voltage-to-frequency converter. A 0 V to 5 V input produces a 0 kHz to 10 kHz output with a linearity of 0.05%. Gain drift ...
    02-03-2023
84. Low-power, super-regenerative receiver targets 433-MHz ISM band
    Circuits Radio Analog Devices ADCMP371
    .. often choose a super-regenerative receiver despite its frequency instability and poor selectivity for battery-powered, short-range, wireless applications in which power ...
    01-03-2023
85. Self-oscillating H bridge lights white LED from one cell
    Circuits Oscillators Supply Light Fairchild BC550 BC557
    .. LED from one cell without an inductor. РFigure 1. Resistors R 1 and R 2 and capacitors C 1 and C 2 set the oscillation frequency. Transistors Q 1 , Q 2 , Q 3 , and Q 4 form the H bridge, which acts as a simple charge-pump converter ...
    15-02-2023
86. RF-telemetry transmitter features minimal parts count
    Circuits Wireless Measurement Analog Devices LTC1250
    .. can operate with almost any resistive transducer based on a Wheatstone bridge. The circuit comprises a VFC (voltage-to-frequency converter) that produces a PPM (pulse-position-modulation) output, and an OOK (on/off-keyed) RF ...
    13-02-2023
87. 555 triangle generator with adjustable frequency, waveshape, and amplitude; and more!
    Circuits Oscillators Texas Instruments LMC555 TLV2372
    .. design idea with a 555 analog timer that can generate an arbitrary triangle/sawtooth with its waveshape and frequency controlled by pots. If you could assemble the list of all the oscillators that have been designed ...
    09-02-2023
88. Hysteretic regulators provide high performance at low cost
    Circuits Supply Texas Instruments LM3485 LMV7219
    .. time to a load change is less than one switching cycle. What's the catch? You must be able to accept a switching frequency that is not precisely controlled and a sensitivity to noise that requires layout skill. Figure 1 shows ...
    08-02-2023
89. Resistive DAC and op amp form hybrid divider
    Circuits Analogue Design Oscillators Analog Devices AD5293 AD8677
    .. becomes The output voltage is Both the input voltage and the digital-input data can be time variables, and the clock frequency for fetching digital-input data can be as high as 50 MHz. Figure 1. The resistive DAC-potentiometer ...
    06-02-2023
90. Low-cost relative-humidity transmitter uses single logic IC
    Circuits Measurement Radio Texas Instruments SN74HC132
    .. circuit requires a 3 to 5 V battery. Two AAA cells can power it for approximately 15 days. If you need a high modulating frequency, then you can reduce R 1 to 1 MΩ, changing the modulating signal to the range of 10 to 20 kHz. ...
    17-01-2023

Sort by: relevance / date