Circuits & Schematics: frequency meter - 11

101. AC Voltage Zero Cross Detector
     Circuits Supply Rohm BM2P129TF BM1Z102FJ
     .. input, 12 V DC Output @ 100 mA) DC Output about 1/100 voltage Approx. 1.1 V with 110 V AC, 2.3 V with 230 V AC input Input Frequency Response 47 Hz to 63 Hz Provides Accurate 50 Hz Square wave with 230 V/50 Hz AC Input Default Output ...
     30-11-2022

102. Circuit lets you measure zener voltages and test LEDs
     Circuits Measurement Diodes ZXLD381
     .. Figure 2 shows. Figure 2. An LED driver provides current for the LED under test. When S 2 is in the upper position, the meter measures voltage across R 1 , a 1-kΩ resistor; the meter displays a negative-voltage-drop value. R 1 ...
     30-11-2022

103. Analog Peak Detector Frames Mechanical Bounce, Quantifies Contact Resistance
     Circuits Analogue Design Measurement Texas Instruments LF411 LM324 LM358
     .. U2, pin 1 (V PEAK ). The switch bounce/noise amplitude will have to be larger than 1 V (peak), and the bounce/noise frequency must be greater than 1 kHz (period less than 1 ms). When the sample switch is closed, potential noise ...
     25-11-2022
104. Cancel PWM DAC ripple and power supply noise
     Circuits Supply Texas Instruments 1P1G3157QDBVRQ1 SN74HC175
     .. TAoE accuracy-promoting concept that utilizes a method of precisely servoing pulse area (amplitude × duration × frequency) to an accurate reference voltage, as shown in another recent DI [ 2 ] in the context of VFC analog to ...
     24-11-2022
105. Improved current monitor delivers proportional-voltage output
     Circuits Measurement Supply
     .. In addition, the circuit also offers possibilities as an ac current sensor. Figure 1. This current sensor uses a variable-frequency oscillator, Q 1 , and a PLL, IC 1 , to measure current in an isolated circuit. To achieve improved ...
     23-11-2022
106. Simple diode serves as a sensor for a thermal probe
     Circuits Measurement Semelab BC177
     .. thermal problems by simply probing a suspicious component with the sensing diode. The circuit, including the indicating meter, can fit into a small housing, such as an empty 20 g glue-stick tube. An ordinary 1N4148 silicon signal diode ...
     21-11-2022
107. Impedance Transformer Flags Failed Fuse
     Circuits Supply Analog Devices AD8606
     .. 5 V power supply. Capacitor C 4 and the secondary inductance, L 2 , of transformer T 1 resonate at approximately 42 kHz, a frequency that minimizes noise production in the audio, R F , and psophometric noise bands. Operational amplifier ...
     18-11-2022
108. Piezoelectric Driver Finds Buzzer's Resonant Frequency
     Circuits Measurement Microcontrollers Usage Microchip PIC18F452
     .. power consumption and clear, penetrating sound. An external driver or a self-driven circuit that oscillates at the resonant frequency of the piezoelectric element can drive these buzzers. A piezoelectric element produces the maximum ...
     17-11-2022
109. Simple blown-fuse indicator sounds an alarm
     Circuits Beginners Supply STMicroelectronics L78L05ABZ
     .. The 1-kΩ resistor forward biases D 2 and Q 1 ’s base-emitter junction, forcing the buzzer to sound at a low frequency equal to the flashing frequency of D 2 . During circuit operation, the 0.1-µF capacitor ...
     15-11-2022
110. Use a heated diode as a flow sensor
     Circuits Measurement Texas Instruments LM393
     .. more precision adjustment is possible. Perhaps 5 V for LM393 is not required; ground would do in this case. b) The wind meter works on the same principle as a hot-wire anemometer. The simple wind meter (Figure 2b) operates on the same ...
     11-11-2022

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