5V to 3.3V Regulator with Fail-Safe Switchover:  DN82 -  Design Notes (Linear Technology) (Circuit / schematic design added 6/06)

AB-17 / Adding an Over-Voltage Crowbar to an RC5051 Converter: Design and Analysis:  Fairchild Application Notes / (Circuit / schematic design added 6/06)

Accurate Power Supply Sequencing Prevents System Damage:  DN384 -  Design Notes (Linear Technology)  (added 1/06)

Add fault protection to a 4 to 20 mA loop supply:  01/22/04 EDN Design Ideas  /  (added 1/05)  A 4- to 20-mA current loop consists of a power source and a current-measuring device at the control end and a field transmitter that senses process-variable information, such as temperature or pressure, and converts it to a current (Figure 1). Most such industrial current loops are powered by 24V dc, but that voltage can range from 12 to 36V....

Adding an Over-Voltage Crowbar to an RC5051 Converter: Design and Analysis / AB-17:  Fairchild Application Notes / (Circuit / schematic design added 6/06)

Additional RFI Protection for Line Input Circuits:  8KB PDF (Electronic circuit added 5/02)

Advanced Polarity Protection with MOSFETs:  Advanced Power Switching and Polarity Protection for Effects (Electronic circuit added 5/02)

Amplifier Thermal Protection:  (Electronic Schematic / circuit added 4/02)

AN-1077: Understanding the Power Supply Requirements of PCI Bus Standard-How to Protect the Digital Components:  National Semiconductor - Application Note   (added 2/06)

AN-110: Fast IC Power Transistor with Thermal Protection:  National Semiconductor - Application Note   (added 2/06)

AN-1194: Failsafe Biasing of LVDS Interfaces:  National Semiconductor - Application Note   (Circuit / schematic design added 6/06)

AN-246: Isolation Barrier Precisely Protects Transducer Signals:  AN-246 - Analog Devices Application Notes  (Circuit / schematic design added 6/06) Through the Judicious Use of Isolation Amplifiers that Incorporate Transformer Coupling, You Can Design Circuits that Accurately Condition and Amplify Low-Level Transducer Signals.

AN-249: over Voltage Protection for the ADG5XXA Multiplexer Series:  AN-249 - Analog Devices Application Notes  (Circuit / schematic design added 6/06)

AN-40-005  Prevention and Control of Electrostatic Discharge (ESD):  Application Note - MiniCircuits.com  (Circuit / schematic design added 6/06)

AN-60-027  Power Supply Transient Protection for MNA and VNA Amplifiers:  Application Note - MiniCircuits.com  (Circuit / schematic design added 6/06)

AN-662: COP800 Based Automated Security/Monitoring System:  National Semiconductor - Application Note   (added 2/06)

AN892: Fail-Safe Monitoring and Clock Frequency Switching using the PIC16f684:  Microchip Application Note - Published 16-Dec-03   (Circuit / schematic design added 6/06)

AN-D11: ±500 Volt Protection Circuit:  Supertex Semiconductors (app note added 2/06)

Asynchronous circuit latches safely:  04/28/94 EDN Design Ideas /  (added 11/05)

Audio Amp Output Power Limiter:  (Electronic Schematic / circuit added 4/02)

Audio Level Control Device:  compressor circuit based on LED and photodiode (Electronic circuit added 5/02)

Automotive Relay Drivers using the Zvn4206av: Protection Free Interfacing with Avalanche Rated MOSFETs:  Zetec Semiconductors  - Applications Notes - An alternative solution is provided to the usual large package Darlington effected relay driver. The ZVN4206AV has been designed, processed and rated to withstand significant energy within the breakdown region. This allows the part to absorb back-emf and transient energy, thereby allowing lower component count circuits.   (Circuit / schematic design added 6/06)

Battery automatic power off has simpler design:  03/31/05  EDN-Design Ideas / (added 10/05)    In low-noise analog circuits, a high-gain amplifier serves at the input to increase the SNR. The input signal level determines the input-stage gain; low-level signals require the highest gain. It is also standard practice in low-noise analog-signal processing to make the circuit's bandwidth as narrow as possible to pass only the useful input-signal spectrum..... (added 10/05)

Battery Discharge Monitor:  (Electronic Schematic / circuit added 4/02)

Battery Protection Circuit Allows Surges:  06/05/97 EDN-Design Ideas / (Electronic circuit added 5/02)   -- Circuit monitors two lithium-ion batteries and protects both of them against Overcharging, Overdischarging, and undervoltage

Bias supply provides short-circuit protection:  09/16/99 EDN Design Ideas  /  (added 2/06) 

Broken Charger-connection Alert:  Detects if a device is not properly connected to its supply.  Suitable for battery chargers, portable appliance supplies etc. (circuit design added 3/05)