Design Ideas
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Monitor circuit conserves battery energyBrian Huffman, Linear Technology Corp, Milpitas, CA, April 19, 2012Use a sampled-data technique to lower a monitor circuit’s average power consumption. More
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Simple circuit lets you characterize JFETsJohn Fattaruso, Dallas, TX, April 5, 2012Measure the pinch-off voltage VP and zero-bias drain current IDSS to select matched pairs of JFETs. More
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Use a transistor and an ammeter to measure inductanceRaju Baddi, Tata Institute of Fundamental Research, Pune, India, April 5, 2012Bipolar junction transistors transfer a current from a lower-resistance emitter to a higher-resistance collector. You can use this property to measure inductance. More
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Use a three-phase rectifier and voltage reducer for offline single-phase suppliesJB Castro-Miguens, Cesinel, Madrid, Spain; C Castro-Miguens, University of Vigo, Spain; M Pérez Suárez, University of Vigo, Spain; and A Abal Pena, Tekplus, Vigo, Spain, April 5, 2012Missing diodes create gaps to allow voltage reduction. More
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Lamps monitor beat frequencyGerald L Assard, Naval Underwater Systems, New London, CT, April 5, 2012Synchronize an unknown frequency with a reference to obtain a zero beat by employing a visual monitor for the audio gap surrounding the near-zero frequencies. More
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Condenser microphone uses dc-coupled impedance converterDimitri Danyuk, Miami, FL, March 15, 2012Eliminate transformers and coupling capacitors in this self-balancing microphone interface. More
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Simple sawtooth generator operates at high frequencyLuca Bruno, IIS Hensemberger Monza, Lissone, Italy, March 15, 2012Use a digital logic gate to generate an analog waveform. More
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Dual regulator handles two input voltagesDavid L Dinsmore, Linear Technology Corp, Dallas, TX, March 15, 2012Use a pair of MOSFETs to switch between 3.3 and 5V regulated voltage. More
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CMOS gate makes long-duration timers using RC componentsRaju Baddi, Tata Institute of Fundamental Research, Pune, India, March 1, 2012Use a common CMOS gate to make long duration timers using low-value RC components. More
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Microcontroller drives piezoelectric buzzer at high voltageMehmet Efe Ozbek, PhD, Atilim University, Ankara, Turkey, March 1, 2012Drive the buzzer directly from the μC’s I/O pins. More
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Conversion circuit handles binary or BCDR Srinivasan, R Ramesh, and DK Murthi, National Aeronautical Lab, Bangalore, India, March 1, 2012Separate binary and BCD up/down counters permit both binary-to-BCD and BCD-to-binary conversion in one circuit. More
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Circuit simultaneously delivers square and square root of two input voltagesMarián Štofka, Slovak University of Technology, Bratislava, Slovakia, March 1, 2012Perform mathematical computations using analog techniques. More
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RC-timed shutoff function uses op amp and momentary switchGlen Chenier, Teeter Totter Tree Stuff, Allen, TX, February 16, 2012Battery-operated instrument benefited from auto-power shutdown. More
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Simple diode serves as a sensor for a thermal probeRaju Baddi, Tata Institute of Fundamental Research, Pune, India, February 16, 2012A two-transistor thermal probe can be used to diagnose circuit problems, such as hot components and thermal runaway. More
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Use an integrator instead of coupling capacitorsVladimir Rentyuk, Modul-98 Ltd, Zaporozhye, Ukraine, February 16, 2012Level-shift a signal with an unknown dc offset to a known offset without ac coupling. More
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Use an LED matrix horizontallyNoureddine Benabadji, University of Sciences and Technology, Oran, Algeria, February 16, 2012Using one 5×7 LED matrix horizontally instead of vertically allows the display of two characters instead of one. More
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Stable pulse generator uses matched transistors in a current mirrorBill Morong, Paoli, PA; Edited by Margery Conner and Fran Granville, February 2, 2012Inexpensive dual transistors work as well as do legacy matched pairs. More
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Implement an audio-frequency tilt-equalizer filterFrancesco Balena, Electro-Acoustic Design, Conselve (PD), Italy; Edited by Margery Conner and Fran Granville, February 2, 2012Developing the transfer functions lets you customize the filter. More
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Circuit provides 70 dB of AGCBen Segal, Telecommunications Technology, Sunnyvale, CA; Edited by Margery Conner and Fran Granville, February 2, 2012A comparator autoranges to ensure that the automatic-gain-control section sees a signal between −60 and −25 dBm, keeping the FET in its linear region. More
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Wireless temperature monitor has data-logging capabilitiesTom Au-Yeung and Wilson Tang, Maxim Integrated Products, Sunnyvale, CA; Edited by Paul Rako and Fran Granville, January 19, 2012You can make a wireless temps system with two ICs. More
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