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В данный сборник включены материалы рубрики “Design Ideas” англоязычного журнала разработчиков электроники “EDN” за 2011 год.
EDN's Design Ideas, contributed by practicing electronics engineers, deliver practical, innovative circuit designs in a concise format complete with circuit schematic diagrams, application details, and even software code.
EDN design ideas 2011 January 2011 Reliable 555 timer doesn’t falsely trigger 01/ 6/2011 Test continuity with an LED Flash an LED from ac-mains power Transistors drive LEDs to light the path Use an optocoupler to make a simple low-dropout regulator Power an LED driver using off-the-shelf components 01/20/2011 Oscillator has voltage-controlled duty cycle Generate noisy sine waves with a sound card Decode a quadrature encoder in software February 2011 Compute a histogram in an FPGA with one clock 02/ 3/2011 Control an LM317T with a PWM signal High-speed buffer comprises discrete transistors Limit inrush current in high-power applications Protect MOSFETs in heavy-duty inductive switched-mode circuits Reduce acoustic noise from capacitors 02/17/2011 Function generator has varibale frequency Power supply accepts wide input-voltage range Circuit lets you test capacitors March 2011 Design provides single-port-to-dual-port SDRAM converter 03/ 3/2011 Zener diode protects FPGA inputs Bicolor LED indicates 10 states Relay driver switches two relays with one pin Anticipator circuit speeds signal settling to a final value 03/17/2011 Schmitt trigger provides toggle function Active multiplexing saves inputs Finely tune the hue of blue-light sources April 2011 Low-component-count logic probe works with TTL and CMOS logic 04/ 7/2011 Circuit implements photovoltaic-module simulator Switch circuit controls lights Isolated PWM suits low frequencies Increase efficiency in embedded digital-I/O lines 04/21/2011 Modulating a reference allows maximum-value search for phase detection Offline supply drives LEDs Light an LED without wasting energy May 2011 Circuit secures bootstrap operation under light load 05/12/2011 Build an accurate bipolar voltage reference Send MIDI signals over long distances MOSFET provides high power at low loss Waveform generator minimizes amplitude dependency 05/26/2011 Produce current from positive or negative high-voltage supplies Arrange LEDs as seven-segment displays Logic gates form high-impedance voltmeter Measure resistance and temperature with a sound card June 2011 Potentiometer calibrates photodiode amplifier 06/ 9/2011 Drive 16 LEDs with one I/O line Circuit measures battery capacity Programmable driver targets piezoelectric actuators Circuit boosts voltage to piezoelectric transducers Protect power-LED strings from overcurrent 06/23/2011 Simple flasher operates off ac mains Use resistor noise to characterize a low-noise amplifier Build a UWB pulse generator on an FPGA Generate swept sine/cosine waveforms with two filters July 2011 Compensate for four-wire sensor errors 07/14/2011 LED-current limiter accepts ac or dc Voltage inverter employs PWM Form positive pulses from negative pulses Positive edges trigger parabolic timebase generator 07/28/2011 Measure small currents without adding resistive insertion loss Power resistor varies in value Minimize noise in power-supply measurements August 2011 Driver circuit lights architectural and interior LEDs 08/11/2011 Use op amps to make automatic-ORing power selector Charging time indicates capacitor value Circuit provides universal ac-input-voltage adapter 08/25/2011 Logic probe uses two comparators DAC fine-tunes reference output LEDs indicate sound level September 2011 Polynomial rotation accelerates CRC calculations 09/ 8/2011 Simple circuit measures optocoupler's response time Circuit provides visual verification of IR pulses An LED's intrinsic capacitance works in a 650-mV LRC circuit Eight LEDs make a 100-division voltmeter 09/22/2011 Simple circuit controls the rate of voltage change across a capacitor or another load LED bar-graph display represents two digits October 2011 Circuit controls inrush current in ac-operated power supplies 10/ 6/2011 Save 3 dB of output power using feedback to set the output impedance Optically isolated overcurrent detector works from ac mains Simple circuit helps to protect a vehicle-reverse camera Use a self-powered op amp to create a low-leakage rectifier 10/20/2011 Simple reverse-polarity-protection circuit has no voltage drop Series-LC-tank VCO breaks tuning-range records November 2011 Circuit detects rapidly falling signals and rejects noise 11/ 3/2011 Hack into a stopwatch to make a phototimer Comparator directly controls power-MOSFET gate AGC circuit uses an analog multiplier Add extra output to a boost converter 11/17/2011 Fabricate a high-resolution sensor-to-USB interface Converters yield droop-free S/H circuit December 2011 Inexpensive VFC features good linearity and dynamic range 12/ 1/2011 Mains-driven zero-crossing detector uses only a few high-voltage parts Build an op amp with three discrete transistors A diode ladder multiplies voltage under software control Charger extends lead-acid-battery life Circuit provides more accurate multiplication 12/15/2011 A few added components make a self-contained controller for 100A load Simple night-light uses a photoresistor to detect dusk Simple tester checks Christmas-tree lights