EDN--------------------电子杂志

52799di.pdf Access odd memory locations without hardware . . . . . . . . . . . . . . . . . . .101 Charge indicator gauges lead-acid batteries . . . . . . . . . . . . . . . . . .102 Use derivatives to catch RF calibration errors . . . . . . . . . . . . . . . . . . .104 mC-based circuit performs frequency multiplication . . . . . . . . . . . . . . . . . . . . . .108 Kick start a crystal oscillator in Spice 110598di.pdf Low-voltage interface circuits translate 1.8 to 5V..........................................................119 Laser-diode driver stabilizes sensitivity parameters ....................................................120 Voice-storage chips talk to each other....122 3.3V converter delivers 3W from Li-ion battery ............................................................124 Pulsing charge pump drives capacitive loads ..............................................................126 Short-circuit finder uses few parts ..........130(只用1.5V，一只LM10+蜂鸣器，就是一个短路测试器 “Tube” circuit provides linear tuning ......130 111199di.pdf Controller IC halves switcher’s standby power..............................................169 Load detector controls power sources ..............................................170 Two-wire interface has galvanic isolation ........................................174 （3只光偶做I2C隔离总线） Measure power-on current transients on ac line ....................................176 Generator has independent pulse width, frequency................................178 Customized potentiometers aid amplifier design ..........................................180 Ring your bell; light your light ..................182 111198di.pdf Voltage reference sets current limit ........129 Accelerometer output gives temperature info ..........................................130 Voltage comparator forms pulse demodulator ......................................132 Watchdog-reset catcher aids embedded-system debugging ................132 Easily display bit-map images on small-graphic LCDs ..............................134 CMOS inverter VCO tunes octave to UHF ............................................................138 Pushbutton or logic controls nonvolatile DAC ..........................................140 12199di.pdf RISC mP implements fast FIR filter ..........119 Simple algorithm transforms filter coefficients ....................................................120 Door/window sensor resists tampering ......................................................120 Use a trick to count scope events ............122 A primer on binary-arithmetic rounding ........................................................124 Light powers isolation amplifier ..............128 Low-cost feedback circuit boosts efficiency ........................................................130 102298.di.pdf Ethernet 10BaseT simulator jig yields zero emissions Digital potentiometer autonulls op amp Single wire connects microcontrollers Photo-flash charger minimizes parts count Generate an analog signal with a mC 080405di.pdf AGC amplifier features 60-dB dynamic range Precision active load operates as low as 2V Squeeze extra outputs from a pin-limited microcontroller 072105di.pdf Power-supply interrupter fights ESD-induced device latch-up High-impedance FET probe extends RF-spectrum analyzer’s usable range Watchdog circuit protects against loss of battery charger’s control signals Circuit adds foldback-current protection (稳压IC加入折回式短路保护) 70705di.pdf Contact-debouncing algorithm emulates Schmitt trigger Inexpensive peak detector requires few components Free program designs and analyzes passive and active filters 62305di.pdf Digital countdown timer may never need battery replacement Wide-range regulator delivers 12V, 3A output from 16 to 100V source Stable, 18-MHz oscillator features automatic level control, clean-sine-wave output Ultra-low-noise low-dropout regulator achieves 6-nV/Hz noise floor 60905di.pdf Inrush limiter also provides short-circuit protection (简单的电源短路保护) Microprocessorbased dual timer features four outputs Wide-range voltage regulator automatically selects operating mode. CMOS hex inverter generates low-distortion sine waves. 52605di.pdf Interrupt-driven keyboard for MCS-51 uses few components Simplified white-LED flasher operates from one cell Low power voltage-to-frequency converter makes a wireless probe for testing an inductive power supply Simple circuit converts 5V to -10V 51205di.pdf Versatile digital speedometer uses few components ..................................95 Microprocessor, linear potentiometer deliver echo pulses ........................................96 Passive-detector receiver keeps you informed, entertained during flights ........98 Quickly estimate an electronic system’s cooling requirements ................100 Spreadsheet converts sound levels 42805di.pdf Camera serializer/deserializer chip set reduces wire count for keypad....................75 Rearranged reference helps ADC measure its own supply voltage ................76 Difference amplifier measures high voltages ..................................................78 Linear potentiometer provides nonlinear light-intensity control.. 41405di.pdf High-side current-sensing switched-mode regulator provides constant-current LED drive ..........................95 Microcontroller’s DAC provides code analysis ..................................................96 Two gates and a microprocessor form digital PLL ..............................................98