Электронный журнал "Радиоежегодник" - Выпуск 6. EDN Design Ideas. Обзор за 2011 год (на англ. языке)
Год | 2011 |
Издательство | Радиоежегодник |
Тема номера: EDN Design Ideas
Выпуск: декабрь, 2011
В сборник включены материалы рубрики "Design Ideas" англоязычного журнала разработчиков электроники "EDN" за 2011 год. В обзоре 102 схемотехнические идеи.
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Содержание:
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January 2011
- Reliable 555 timer doesn’t falsely trigger
- 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
- Oscillator has voltage-controlled duty cycle
- Generate noisy sine waves with a sound card
- Decode a quadrature encoder in software
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February 2011
- Compute a histogram in an FPGA with one clock
- 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
- Function generator has varibale frequency
- Power supply accepts wide input-voltage range
- Circuit lets you test capacitors
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March 2011
- Design provides single-port-to-dual-port SDRAM converter
- 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
- Schmitt trigger provides toggle function
- Active multiplexing saves inputs
- Finely tune the hue of blue-light sources
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April 2011
- Low-component-count logic probe works with TTL and CMOS logic
- Circuit implements photovoltaic-module simulator
- Switch circuit controls lights
- Isolated PWM suits low frequencies
- Increase efficiency in embedded digital-I/O lines
- Modulating a reference allows maximum-value search for phase detection
- Offline supply drives LEDs
- Light an LED without wasting energy
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May 2011
- Circuit secures bootstrap operation under light load
- Build an accurate bipolar voltage reference
- Send MIDI signals over long distances
- MOSFET provides high power at low loss
- Waveform generator minimizes amplitude dependency
- 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
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June 2011
- Potentiometer calibrates photodiode amplifier
- 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
- 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
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July 2011
- Compensate for four-wire sensor errors
- 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
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August 2011
- Driver circuit lights architectural and interior LEDs
- Use op amps to make automatic-ORing power selector
- Charging time indicates capacitor value
- Circuit provides universal ac-input-voltage adapter
- Logic probe uses two comparators
- DAC fine-tunes reference output
- LEDs indicate sound level
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September 2011
- Polynomial rotation accelerates CRC calculations
- 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
- Simple circuit controls the rate of voltage change across a capacitor or another load
- LED bar-graph display represents two digits
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October 2011
- Circuit controls inrush current in ac-operated power supplies
- 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
- Simple reverse-polarity-protection circuit has no voltage drop
- Series-LC-tank VCO breaks tuning-range records
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November 2011
- Circuit detects rapidly falling signals and rejects noise
- 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
- Fabricate a high-resolution sensor-to-USB interface
- Converters yield droop-free S/H circuit
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December 2011
- Inexpensive VFC features good linearity and dynamic range
- 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
- 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