Lightning Protection for Aircraft Electrical Systems:  MicroNote 127 from Microsem  (Circuit / schematic design added 6/06)

Lightning Protection for Aircraft per RTCA/DO-160D for ARINC 429 Protocol:  MicroNote 126 from Microsem  (Circuit / schematic design added 6/06)

Logic PSU with OverVoltage Protection:  5 volt regulated power supply for TTL and 74LS series integrated circuits, includes output Overvoltage fault protection (Electronic circuit added 5/02)

Loud Speaker Protection and Muting:  (Electronic Schematic / circuit added 4/02)

Method Offers Fail Safe Variable Reluctance Sensors:  11/22/01 EDN Design Ideas  /  (added 1/05)  Variable-reluctance sensors are preferred for industrial and automotive environments, because they sustain mechanical vibration and operation to 300 C. In most applications, they sense a steel target that is part of a rotating assembly. Because the unprocessed signal amplitude is proportional to target speed, a sensor whose signal-processing circuitry is designed for high speed cease... ...

Method provides overpower protection for quasiresonant supplies:  10/28/04 EDN Design Ideas Online (added 1/05) The main characteristic of quasiresonant switch-mode power supplies is that they exhibit a varying frequency when the input voltage changes. 

Microcontroller protects DC Motor:  02/17/05 EDN Design Ideas  / (added 5/05)  Although any overloaded dc motor can draw excessive current and sustain damage, a cooling fan's motor is particularly vulnerable due to fouling by dust, insects, or misplaced objects. A few fans include built-in overload protection, and others can use an external warning device, such as Microchip's TC670 fan-failure detector.

Monitor and Protect Automotive Systems with Integrated Current Sensing:  DN374 -  Design Notes (Linear Technology)  (added 1/06)

MOSFET Beats Murphy's Law:  12/22/94 EDN-Design Ideas / (Electronic Circuit diagram added 03/03)

MOSFET Enhances Voltage Regulator's OverCurrent Protection:  03/03/05 EDN Design Ideas  / (Circuit / schematic design added 6/06)  The classic LM317 adjustable-output linear voltage regulator offers a relatively high, if package-dependent, current-handling capability. In addition, the LM317 features current limiting and thermal-overload protection. With the addition of a few components, you can enhance an LM317-based voltage regulator by adding a high-speed short-circuit current limiter (Figure 1).

Motor uses simple reverse battery protection:  03/18/04 EDN Design Ideas  / (added 11/05)  This Design Idea presents a low-side, reverse-battery-protection technique for a dc-motor system. The system in Figure 1 incorporates two protection options. The common practice of using a diode for reverse-battery protection does not work with dc motors' inductive loads. In Figure 1, an Allegro (www.

Open collector output provides fail safe operation :  09/04/03  EDN-Design Ideas / (Electronic circuit added 10/03) It is common practice to use digital open-collector outputs for control units in industrial applications. Using these outputs, you can switch loads, such as relays, lamps, solenoids, and heaters. One possible problem inherent to this type of output stage is a short circuit from the output to the supply voltage (often, 24V)....

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

Over Voltage Protection on AC Adapter Input (AN-31):  Application Note 31 from Microsem  (Circuit / schematic design added 6/06)

Over Voltage Protection on AC Adapter Input (AN-31):  Application Note 31 from Microsem  (Circuit / schematic design added 6/06)

Over-/Under-Voltage Protection of Electrical Appliances:  (Electronic Circuit / Schematic added 10/04)

Overload and Reverse Current Circuitry Protects Battery and Load:  03/01/96 EDN-Design Ideas / (added 03/03) Battery-operated equipment is prone to the consequences of backward-installed batteries, accidental short circuits, and other careless use. The effects of a reversed battery are critical. Unfortunately, it's difficult to guard against a reversed battery. To make equipment resistant to the reverse installation of batteries, you must design either a mechanical block to the reverse installation or an electrical safeguard that prevents ill effects when the reverse installation occurs. Mechanical protection can be a one-way connector that accepts the battery only when oriented with the correct polarity. For example, 9V radio batteries have mechanically dissimilar terminals,...

OverVoltage Protection for LM317:  (Electronic Schematic / circuit added 4/02)

OverVoltage Protection:  describes crowbar technique that provides a useful defense for fast Over voltage spikes and transients that could cause damage to more sensitive components (Electronic circuit added 5/02)

Polarity protector outperforms Schottky diodes:  02/06/03 EDN Design Ideas  /  (added 1/05)  The polarity-protection circuit in Figure 1 is a high-performance alternative to the usual series diode (often Schottky). The circuit incurs a much lower voltage drop than even the best Schottky diode. The circuit uses MOSFET devices because of their low on-resistance. For the transistors in this design, the combined on-resistance is 0....

Power line outage flashes red alert:  06/13/02  EDN - Design Ideas / (Electronic circuit added 10/03)    This Design Idea expands on a circuit in a previous one to configure a power-outage detector with a flashing alarm (Figure 1, Reference 1). The circuit plugs into a mains outlet and uses trickle-charged nickel-cadmium batteries. The green-LED monitors the presence of line voltage. The BZV55-C4V3 zener diode, D1 protects the batteries against overvoltage..

Power supply interrupter fights ESD induced Devicelatch up:  02/05/2004  EDN-Design Ideas  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)

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

Power-Supply Failure Alarm:  (Electronic Circuit / Schematic added 10/04)

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

Protecting and Monitoring Hot Swappable Cards in High Availability Systems:  DN360 -  Design Notes (Linear Technology)  (added 1/06)

Protecting USB Data I/O Ports:  MicroNote 117 from Microsem  (Circuit / schematic design added 6/06)

Protection Circuit Covers a Wide Range:  07/17/97 EDN-Design Ideas / (Electronic Circuit diagram added 03/03)  

Protection for your Electrical Appliances:  (Electronic Circuit / Schematic added 10/04)

RS-232 OverVoltage Protection Circuits:  (Electronic Schematic / circuit added 4/02)