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Last Updated on: Friday, June 04, 2021 06:51 AM

Links to electronic circuits, electronic schematics and designs for engineers, hobbyists, students & inventors:

Palmpilot Turbo Boost Guage Interface - (electronic circuit added 4/05)

Pass Transistor Lowers Dropout Voltage - 02/18/99 EDN-Design Ideas....With linear regulators,you measure dropout voltage, VIN–VOUT, at the minimum input voltage for which the IC sustains regulation....File contains several circuits, please scroll to this this one. [Design Idea by Budge Ing, Maxim Integrated Products, Sunnyvale, CA]

Photo Flash Charger Minimizes Parts Count - 10/22/98 EDN-Design Ideas. Photo-flash and strobe devices operate by discharging a high-voltage capacitor into a bulb. Charging the capacitor from a battery. [Design Idea by Steven Chenetz]

Positive regulator makes dual negative output converter - 26-Jun-03 Issue of EDN Some systems, such as optical networks, requirethan one negative voltage. A common procedure is to boost the main negative. [Design Idea by Keith Szolusha, Linear Technology Corp, Milpitas, CA]

Positive regulator makes negative dc/dc converter - 26-Dec-02 Issue of EDN Power-supply designers can choose from a plethora of available positive buck regulators that can also serve as negative boost dc/dc converters. Some buck regulators have a negative-feedback reference voltage expressly for this purpose, but ICs that have positive-reference feedback voltages far outnumber these negative-feedback regulators. [Design Idea by Keith Szolusha, Linear Technology Corp, Milpitas, CA]

PWM controller drives LEDs from High-Voltage lines - 4-Mar-04 Issue of EDN Powering LEDs from a wide dc range—say, 30 to 380V—without wasting a lot of power in the regulating block, is a difficult task when the LED current needs to be constant. Dedicated LED drivers are available, but they usually implement boost structures and are thus inadequate for high-voltage inputs. [Design Idea by Christophe Basso, On Semiconductor, Toulouse, France]

Scheme provides high-side current-sensing for white-LED drivers - 19-Feb-04 Issue of EDN White LEDs find wide use in backlighting color-LCD screens in most portable devices, such as cellular phones, PDAs, and MP3 players. Multiple LEDs often connect in series to ensure that the same current flows through every LED. To forward-bias these LEDs, a voltage of 10 to 16V comes from an inductor-based boost regulator, such as an SP6690. [Design Idea by Dimitry Goder, Sipex Corp, San Jose, CA]

Short-Circuit Beeper - (schematic / circuit added 6/07)

Short-Circuit Protection for Boost Regulators - DN154 Design Notes (Linear Technology) (App Note added 1/06)

Simple Boost Converter Generates 27 & 87V - 05/22/97 EDN-Design Ideas....In modern telecommunications applications, the basic communications link to the home is becoming either digital or wireless. The normal circuitry to control a telephone is moving from the central office to the home. Subscriber-line-IC chips. [Design Idea by David Feller, Harris Semiconductor, Dallas, TX]

Simple circuit converts 5V to –10V - 26-May-05 Issue of EDN Switched-capacitor circuit doubles, inverts dc source. [Design Idea by Ken Yang, Maxim Integrated Products Inc, Sunnyvale, CA; Edited by Brad Thompson]

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