|
Safety /
Protection Circuits, Page 7
Safety / Protection: #-B
C-D E-K
L-N O-R
S T-V
Last Updated on:
Thursday, April 19, 2012 06:13 AM |
|
|
Links to electronic circuits, electronic schematics, designs for engineers,
hobbyists, students & inventors:
|
|
|
|
Thermal Shutdown/ Protection - Add this circuit to either turn the amp
off or activate a cooling fan if it overheats .... |
|
Thermal switches provide circuit disconnect - 4-Sep-03 Issue of EDN
A single temperature sensor can provide an interrupt to a microcontroller when
the measured temperature goes out of range. You need.... [Design Idea by Mark
Cherry, Maxim Integrated Products, Sunnyvale, CA] |
|
Transistors offer thermal protection for controller - 19-Jul-01 Issue
of EDN 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..... [Design Idea
by Christopher Basso, On Semiconductor, Toulouse, France] |
|
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... [Design Idea by Vincent
Himpe, Alcatel Microelectronics, Desselgem, BelgiumVincent Himpe, Alcatel
Microelectronics, Desselgem, Belgium] |
|
|
|
Undershoot Protection When using Bus Switches - Pericom Semiconductor
Application Note # 030 (app note added 2/05) |
|
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] [Design Idea by Rolando Herrero, Instituto Tecnologico de
Buenos Aires, Argentina] |
|
|
|
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 by Andy Collison added
07/07/07) |
|
Watchdog circuit protects against loss of battery charger's control signals -
21-Jul-05 Issue of EDN Hardware circuit keeps software-based charging within
limits.... [Design Idea by Andy Fewster, Maxim Integrated Products Inc, Hampshire, UK;
Edited by Brad Thompson and Fran Granville] |
|
Watchdog circuit uses ac triggering - 16-Aug-01 Issue of EDN 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 by Shyam Tiwari, Sensors Technology
Private Ltd, Gwalior, India] |
|
|
Watchdog Circuit uses Leftover Gates - 08/01/96 EDN-Design Ideas....The reset
and µP-controlled watchdog circuit in Figure 1 a makes good use of some unused inverter
gates in IC1. The design is extremely simple. The circuit is a continuously running
oscillator with programmable high- and low-level pulse widths that have additional
intervention-control input from the µP. Because the circuit is a continuous running
oscillator, the circuit generates.... [Design Idea by Shyam Sunder Tiwari, IGCAR,
Kalpakkam, India] |
|
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) |
|
|
Watchdog reset catcher aids embedded system debugging - 11/19/98 EDN-Design
Ideas....A simple "junk-box" circuit uses a 4013 CMOS flip-flop and a handful of
passive components to determine whether random resets are the result of a blown stack or
the result of the watchdog-reset circuit tripping (Figure 1]. You can also use this
circuit to "grab" and hold.... [Design Idea by Scott Newell, PCSI, Fort Smith, AR] |
|
Watchdog Time Out is Independent of Reset - 09/01/95 EDN-Design Ideas....Many
embedded systems use µP supervisors with on-chip watchdog timers. Some supervisors, such
as the MAX691, allow you to select different watchdog and reset time-out periods,
depending on how you connect pin 7 (Osc In] and pin 8 (Osc Sel]. Table 1 in the MAX691
data sheet indicates the available watchdog and reset time-out choices. However, when you
implement.... [Design Idea by Larry Buyan, Criticare Systems Inc, Waukesha, WI] |
|
Watchdog timer allows entry to test-mode - 19-Jul-01 Issue of EDN 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
to avoid accidentally triggering the test mode Depress two keys, hold both keys
simultaneously and continuously throug.... [Design Idea by Greg Sutterlin and Larry
Barnes, Maxim Integrated Products, Sunnyvale, CA, and Craig Gestler, Mining Safety
Appliances Co, Mars, PA] |
|
Watchdog Timer Assumes Varied Roles - The following application note
demonstrates alternative uses for the MAX6369-MAX6374 family of pinselectable watchdog
timers. Alternative uses include a power saving power-on LED indicator circuit, load
connect/disconnect circuit and push-button reset circuit. (Maxim APPLICATION NOTE
582) |
|
Watchdog Timer Reboots PC's - 06/05/97 EDN-Design Ideas....When you use a PC to
control a process or collect data, it's often desirable to have a watchdog timer reboot
the computer if it runs astray. The circuit in Figure 1 uses a PIC16C84.… [Design Idea by
Charles Hamilton, Burr-Brown Corp, Tucson, AZ] |
|
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) |
|
|
| |
|
Safety / Protection:
#-B
C-D E-K
L-N O-R
S T-V |
