Circuits & Schematics: frequency - 8

71. Creating a very fast edge rate generator for testing (or taking the pulse of your scope)
    Damian Bonicatto Phoenix Bonicatto
    Circuits Oscillators Analog Devices LTC6905
    .. recently purchased a new oscilloscope for home use. It’s a 250 MHz scope, but I was curious what the actual 3 dB frequency was as most scopes have a bit more upper end margin than their published rating. The signal generators ...
    Mar 18, 2024

72. Logic Probe has a wide voltage range
    Peter Demchenko
    Circuits Measurement Texas Instruments SN74HC132 SN74HC14
    .. or bad contact). It also features a counter, which is very handy when you want to count impulses, to estimate the value of frequency or to test an interface. (This part is shown as a sketch.) The probe in Figure 1 consists of two ...
    Mar 7, 2024

73. ∆Vbe differential thermometer needs no calibration
    Stephen Woodward
    Circuits Analogue Design Measurement Texas Instruments CD4053B TLV2374
    .. 1% “error” to result in a final, acceptably accurate 20 mV/ C demodulator output. The modulating/demodulating frequency F C generated by the A1b oscillator is deliberately set by the R4C1 time constant to be half the power ...
    Mar 6, 2024
74. "Sub-zero" op-amp regulates charge pump inverter
    Stephen Woodward
    Circuits Analogue Design Supply Texas Instruments TLV9064
    .. a cycle that begins with C2 being charged to V IN via U1a, then completes by partially discharging C2 into C3 via U1b. Pump frequency is roughly 100 kHz under control of the U1c Schmidt trigger style oscillator, so that a transfer occurs ...
    Feb 9, 2024
75. Using an inductor to improve an existing design
    Peter Demchenko
    Circuits Supply Analog Devices ADR444
    .. output. A rather low value of inductance (0.1 1.0 mH) is sufficient. (This low value may be counter-intuitive to the low frequency of the multivibrator, which is less than 1 kHz.) The negative output voltage slowly increases with an ...
    Jan 31, 2024
76. RLD-based astable 555 timer circuit
    Arthur Edang Maria Lourdes Lacanilao-Edang
    Circuits Oscillators Texas Instruments LM555CN
    .. Time_High (µs) 19.868 20.354 2.42 Time_Low (µs) 58.588 63.800 8.52 Period (µs) 78.456 84.154 7.01 Frequency (kHz) 12.746 11.883 7.01 Duty_High (%) 25.323 24.187 4.59 Figure 3. Experimental set-up with the ...
    Jan 26, 2024
77. Gated 555 astable hits the ground running
    Stephen Woodward
    Circuits Oscillators Texas Instruments LMC555 SN74HC04
    .. classic and versatile 555 finds its way into many low to moderate frequency oscillator applications. Some of these require the ability to selectively gate oscillation on and off ...
    Jan 18, 2024
78. A simple, accurate, and efficient charge pump voltage inverter for $1 (in singles)
    Stephen Woodward
    Circuits Supply Texas Instruments CD4053B
    .. a cycle that begins with C2 being charged to V IN via U1a, then completes by partially discharging C2 into C3 via U1b. Pump frequency is roughly 100 kHz under control of the U1c Schmidt trigger style oscillator, so that a charge transfer ...
    Jan 10, 2024
79. Squashed triangles: sines, but with teeth? Part 1
    Nick Cornford
    Circuits Oscillators Texas Instruments LM393 TL081 TLV237x
    .. is a square wave, with an exponential tri-wave present on C T . While the duty cycle is exactly 50% and the operating frequency is stable with supply variations assuming balanced power rails and a rail-to-rail op-amp output neither ...
    Jan 8, 2024
80. Adding one resistor improves anemometer analog linearity to better than ±0.5%
    Stephen Woodward
    Circuits Analogue Design Measurement Texas Instruments LM10 LMC555 2N5089
    .. trigger early by an amount proportional to anti-log Q2’s collector current. This shortens VFC period and raises VFC frequency by a nonlinearity-correcting factor and results in Figure 6. Figure 6. Improved analog linearity ...
    Dec 29, 2023

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