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Safely swap SCSI disk drives - 09/30/99 EDN-Design Ideas:.....(design idea added
11/05) |
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Safety Deviceuses GMR sensor - 07/10/03 EDN-Design Ideas: (design idea added 3/06) |
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Short circuit protected Power Supply from PC 12V supply - (electronic circuit
added 4/05) |
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Short-Circuit Beeper - (schematic / circuit added 6/07) |
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Short-Circuit Protection for Boost Regulators - DN154 Design Notes (Linear
Technology) (app note added 1/06) |
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Shunt Regulator Provides overVoltage Protection - 01/15/98 EDN-Design Ideas: The
circuit in Figure 1 uses a typical technique for varying the output voltage of a power
supply via a programmable control voltage. Although the topology and schematic details
of the power supply are not critical, the protection technique is novel.....(design
idea added 6/06) |
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Simple circuit safely deep discharges NiCd battery - 04/29/99 EDN-Design Ideas:
Nickel-cadmium (NiCd)batteries can possess an undesirable memory effect due to partial
discharges. The remedy is a complete discharge before charging again. Figure 1a shows
a simple circuit that performs this feat. Although relatively straightforward in
concept, the circuit.....(design idea added 2/06) |
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Simple Electronic Circuit Breaker - This circuit uses the on-resistance of the
MOSFET as the current sensor. Reset it by removing the input power or the load. The
circuit draws no current unless tripped. Designed by Andrew R. Morris
(added 09/05) |
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Single Transistor provides short circuit protection - 10/16/03 EDN-Design Ideas:
In certain dc/dc-converter applications, on-chip, cycle-by-cycle current limit may be
insufficient protection to prevent a failure during a short circuit. A nonsynchronous
boost converter provides a direct path from the input to the short circuit through the
inductor and the catch diode.....(design idea added 1/05) |
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Smart switch cuts transformer turn on Current - 04/23/98 EDN-Design Ideas: [Note:
File contains multiple circuits scroll to find this circuit.] Transformer-core
saturation can cause inexplicable fuse blowing, system crashes, or premature switch
and relay failure. When a core saturates, it loses its inductive characteristics;
primary winding.....(design idea added 11/05) |
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Spark detector uses proximity - 11/27/08 EDN-Design Ideas: , Use a
Hall-effect sensor to measure engine rpm with a voltmeter.....(design idea added
08/09) |
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Spark gaps Provide ESD Protection - 09/01/97 EDN-Design Ideas: (design idea added
3/03) |
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Speaker Protector - (electronic diagram added 6/03) |
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Stabilized Power Supply With Short Circuit Protection - Here is an efficient
4-stage stabilized power supply unit for testing electronic circuits. It provides well
regulated and stabilized output, which is essential for most electronic circuits to
give proper results. The circuit provides an audio- visual indication if there is a
short circuit in the PCB under test, so the power supply to the circuit ‘under test’
can be cut-off immediately to save the valuable components from damage. ….(electronic
schematic added 11/08) |
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Switcher improves overvoltage protection circuit - 06/10/04 EDN-Design Ideas:
Overvoltage-protection circuits often protect electronic devices from power-supply
transients, such as a rise from plugging in batteries or an external power adapter.
Although these devices traditionally find us.....(design idea added 1/05) |
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Synchronize asynchronous reset - 01/06/00 EDN-Design Ideas: Synchronous reset and
asynchronous reset are both common reset mechanisms for state machines, and the reset
circuit in Figure 1 combines the advantages of each. Synchronous reset has the
advantage of synchronization between clock and reset signals, which prevents race
conditions from occurring between the clock and the reset signal. However,.....(design
idea added 2/06) |
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Thermal Shutdown/ Protection - Add this circuit to either turn the amp off or
activate a cooling fan if it overheats (schematic added 6/07) |
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Thermal Switches provide circuit disconnect - 09/04/03 EDN-Design Ideas: A single
temperature sensor can provide an interrupt to a microcontroller when the measured
temperature goes out of range. You need multiple temperature sensors when you have to
monitor more than one hot spot. A microcontroller implements the proper protective
action when one of the temperature monitors detects an overtemperature
condition.....(design idea added 1/05) |
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Transistors offer thermal protection for Controller - 07/19/01 EDN-Design Ideas:
When a switch-mode power-supply controller, such as On Semiconductor's NCP1200,
operates at a high ambient temperature, you should protect the entire power supply
against lethal thermal runaway. The NCP1200 operates directly from the power mains
without an auxiliary winding; therefore, the die in the IC dissipates power (Figure
1).....(design idea added 10/03) |
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Two Buttons Provide Safe Start - 07/06/00 EDN-Design Ideas: The circuit in Figure
1 provides a safety interlock that checks the actuation of two pushbuttons before
enabling a relay. When you push both buttons, the circuit actuates the relay. At that
point, you can release one of the switches without the relay'.....(design idea added
7/03) |
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Undershoot Protection When using Bus Switches - Pericom Semiconductor Application
Note # 030 (app note added 2/05) |
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Voltage Monitor Prevents Deep Discharge of Battery - 05/07/98 EDN-Design Ideas:
NOTE: Page includes several designs, scroll to find this one....mCs such as the 8051
and 8096 and UARTs such as the 82510 provide hardware support for a multiprocessor
asynchronous serial-communication protocol (MicroLan). This feature is
useful.....(added 11/05) |
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Voltage Protection - Safety devices like fuses provide protection against excess
current, but do nothing for transients and short duration spikes of high voltahe on
the power supply lines.This circuit uses the "crowbar" method and provides fast
protection against transient voltage spikes... (circuit design added 07/07/07) |
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Watchdog Circuit Protects Against Loss of Battery Charger's Control Signals -
07/21/05 EDN-Design Ideas: Hardware circuit keeps software-based charging within
limits.....(design idea added 10/05) |
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Watchdog Circuit uses AC Triggering - 08/16/01 EDN-Design Ideas: A dc-triggered
reset of a watchdog circuit is prone to failure. If the watchdog program hangs up,
then the reset signal becomes activated continuously, and the microprocessor has no
way to escape the situation. We found that a simple solution uses an ac trigger to
reset the watchdog circuit (Figure 1).....(design idea added 1/05) |
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Watchdog Circuit uses Leftover Gates - 08/01/96 EDN-Design Ideas: (design idea
added 3/03) |
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Watch-Dog for Telephones - Most of the telephone security devices available in
market are simple but quite expensive. These devices provide blinking or beeping type
line-tap/misuse indications. Quite often they do not offer guaranteed protection
against unauthor-ised operation. A very simple and uni- que circuit of a telephone
watch-dog to safeguard subscriber telephone lines against any fraud is described here.
This little circuit keeps continuous watch over the telephone lines and sounds an
alarm in case of any misuse. In addition it transmits a loud tone through the
telephone lines to prevent further misuse. ….(electronic schematic added 11/08) |
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Watchdog Time Out is Independent of Reset - 09/01/95 EDN-Design Ideas: (design
idea added 3/03) |
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Watchdog Timer Allows Entry to Test Mode - 07/19/01 EDN-Design Ideas:
Manuals for microprocessor-based devices often include instructions for entering a
"secret mode" in which you can test or reset the device. These instructions typically
ask you to depress and hold one or two switches for a minimum time interval. You can
adopt several measures.....(design idea added 1/05) |
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Watchdog Timer Assumes Varied Roles - 02/01/01 EDN-Design Ideas:.....(design idea
added 05/03) |
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Watchdog Timer Reboots PC's - 06/05/97 EDN-Design Ideas: (design idea added 3/03) |
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What is a Thyristor Surge Protector Device - MicroNote 105 from Microsem Reviews
the basics of an avalanche voltage triggered thyristor designed for transient voltage
protection, used largely for telecom signal lines (app note added 6/06) |
