Circuits & Schematics: detector - 9

81. Adaptive rotary encoder distinguishes fine from coarse
    Anthony Smith
    Circuits
    .. is shown outside the shaded area and works as follows. Monostable multivibrator IC3a and flip-flop IC2b form a simple rate detector which monitors the frequency of the signal at B. Faster rotation of the encoder increases the ...
    Apr 14, 2014

82. Soldering iron driver bridge controls temperature
    Kiril Karagiozov
    Circuits Automation Tools and Technologies Power
    .. iron's temperature to the selected value. Most parts are not critical. A BC547 was used for Q1. U3 is an active peak-detector ( Reference 4 ), and U4 is connected as an inverting Schmitt trigger (ST) with trip thresholds at about ...
    Jan 2, 2015

83. Novel Q-meter
    Louis Vlemincq
    Circuits Measurement
    .. oscillate. The current in the other arm of the quad is intercepted by R1, and results in a voltage appearing on the diode detector D6/D7, and the output J1. D7 is a peak detector compensated by D6. When a signal is detected, it ...
    Jan 26, 2015
84. Simple pulse oximetry for wearable monitor
    Circuits Analogue Design Medicine Linear Technology LT6003
    .. amplifier with a gain of 30. The negative input of comparator IC4 is connected to the modified signal using the peak detector circuit. Components IC3, D1, and C6 are used to detect and hold the maximum voltage of the input signal. ...
    Jul 3, 2015
85. Circuit detects rapidly falling signals and rejects noise
    Circuits Analogue Design Measurement
    .. the output to change state. You set the threshold level with voltage divider R 6 and R 7 . D 1 , R 5 , and C 2 form a peak detector. R 5 establishes a time constant of the discharge of C 2 and provides sensitivity to a falling ...
    Sep 30, 2015
86. Schmitt trigger adapts its own thresholds
    Anthony Smith
    Circuits Analogue Design Texas Instruments TLC3702
    .. amplitude of the input signal. Comparator IC 1A together with analog switch IC 2B and capacitor C 1 form a positive peak detector. When the input signal rises above the voltage stored on C 1 at the comparator's inverting input, the ...
    Dec 3, 2015
87. Low-cost isolation amplifier suits industrial applications
    Circuits Analogue Design Measurement NXP LM385 BAV99
    .. tracking of the diodes within the dual-diode package. Average current consumption of the circuit, excluding the peak-detector op amp, is approximately 150 µA. The noise and stability of the 2.5 V supply that drives the ...
    Jan 31, 2016
88. Locked-sync sine generator covers three decades with low distortion
    Alfredo Saab
    Circuits Oscillators NXP 74HC4046 74HC4060 MAX297
    .. NXP Semiconductors 74HC4046 , is a PLL (phase-locked loop) with a VCO (voltage-controlled oscillator) and a phase/frequency detector. It has three internal phase detectors, but this design uses the one with a frequency-capture range equal ...
    Aug 11, 2016
89. Monitor Transformer Winding's Temperature Without A Sensor
    Louis Vlemincq
    Circuits Analogue Design Measurement
    .. techniques. Both signals are used by U1, which is connected as a full-wave synchronous demodulator. This detector cancels any dc error or offset accumulated during the signal processing, and it eliminates frequencies ...
    Sep 2, 2016
90. Reduce relay coil current with a reset controller IC
    Circuits Analogue Design Power Microchip MCP101
    .. Baxter EDN This Design Idea shows how to use a 63¢ (Q=1) microprocessor reset voltage detector IC in a relay coil drive circuit to greatly reduce the coil’s hold-in current. When asked to ...
    Sep 6, 2016

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