Circuits & Schematics: frequency meter - 10

91. Bandpass filter has adjustable Q
    Frank Cox
    Circuits Signal Processing, Filters Analog Devices LT1228
    .. filter is defined as the ratio of the 3 dB pass bandwidth to the stop bandwidth at some specified attenuation. The center frequency of the bandpass filter in this example is 3 MHz, but this can be adjusted with appropriate LC tank ...
    Dec 12, 2023

92. Force/sense connection eliminates multiplexer on-resistance error
    Stephen Woodward
    Circuits Amplifiers Analog Devices LT1028
    .. and, therefore, the source of 100% error. The obvious approach, using larger resistors, works poorly when you need high-frequency performance. The resulting RC delay products can cause frequency peaking, ringing, and, sometimes, ...
    Dec 8, 2023

93. HV flyback converter improves efficiency
    Anil Maini Nakul Maini Varsha Agrawal
    Circuits Supply Texas Instruments LM311 LM555 VFC32BM CD4011A
    .. and transfer cycle that takes the load to its final voltage. Any attempt to design the converter using a fixed switching frequency results in poorer efficiency. In the case of higher switching frequency, energy transfer would be ...
    Dec 1, 2023
94. UVP protects rechargeable batteries
    Peter Demchenko
    Circuits Supply Diodes TL431
    .. be minimized to reduce power dissipation. For a quick charge of Q2’s gate capacitance C G during turn-on, oscillator frequency should be high (it’s about 900 kHz here). For quick turn-off, R5 should not be too high: the time ...
    Nov 30, 2023
95. Circuit forms satellite-dish command decoder
    Mark Giebler
    Circuits Signal Processing, Filters Microcontrollers Usage TV
    .. only the coaxial cable between the receiver and the dish to send commands for actions such as changing the low-noise-block frequency range or switching between dishes for multisatellite reception. The DISEqC protocol specifies a bit ...
    Nov 9, 2023
96. PWM controller drives LEDs from high-voltage lines
    Christophe Basso
    Circuits Supply ON Semiconductor NCP1200
    .. mode, the sum of on-time and off-time gives the switching period of the 1200AP60: where f S is the switching frequency. Extracting L 1 yields If you select a ripple current of 20 mA peak-to-peak at 380 V dc, then From this ...
    Nov 7, 2023
97. Low-cost digital DAC provides digital three-phase-waveform synthesis
    S Gonzalez
    Circuits Oscillators NXP UDA1330ATS
    .. Reference 1 ) or DDS (direct digital synthesis). Digital techniques provide higher stability and the ability to incorporate frequency, phase, and amplitude adjustments. For applications requiring 16-bit or higher-resolution, ...
    Oct 27, 2023
98. DC-voltage doubler reaches 96% power efficiency
    Marián Štofka
    Circuits Supply Analog Devices AD8617 ADG888
    .. converter in applications in which power efficiency is a critical issue. The two phases of operation repeat periodically at frequency f, which clock generator IC 2 determines. The duty cycle is about 50%, but the value isn’t all ...
    Oct 19, 2023
99. A 50 MHz 50:50-square wave output frequency doubler/quadrupler
    Stephen Woodward
    Circuits Signal Processing, Filters Texas Instruments SN74AC86 SN74AC74 TLV2374
    .. 50:50 square waves, thus slicing and dicing the time axis into equal segments. He’s also often included a wide-range frequency doubler functions: Convert any signal to exactly 50% duty cycle ( Ref. 1 ) Frequency doubler with 50 ...
    Oct 10, 2023
100. Circuit's RMS output is linearly proportional to temperature over wide range
     R O Ocaya
     Circuits Measurement Analog Devices LT1001
     .. between V 1 and V 2 and therefore has an inherent dc level that can filtered using a simple RC-network with a low cut-off frequency, e.g., 2 Hz if needed. Filtering guarantees square-wave output with negligible peak level attenuation ...
     Oct 3, 2023

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