Safety
/ Protection Circuits, Page 2a
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Last Updated on:
Wednesday, November 29, 2017 05:39 AM |
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| Circuits Designed by Dave
Johnson, P.E. : |
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CIRCUIT PROTECTS FROM BATTERY POLARITY REVERSAL
This simple circuit can protect a sensitive electronic circuit from an accidental
connection of a battery with a reversed polarity. The N-channel FET connects
the electronic device to the battery only when the polarity is correct. The
circuit shown was designed for a device powered from a single 1.5 volts button cell
battery. However, the circuit will operate with higher voltages as well.
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Links to electronic circuits, electronic schematics, designs for engineers,
hobbyists, students & inventors:
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[GlobalSpec-AD/ad-smSQ-ihsGS.htm] |
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Circuit guards amplifier outputs against overvoltage - 5-Jul-07 Issue
of EDN An automotive-protection circuit withstands repeated insults of
direct short circuits to the full battery voltage.... [Design Idea by John Guy,
Maxim Integrated Products, Sunnyvale, CA] |
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Circuit indicates ac-mains-fuse failure - 8-Jan-09 Issue of EDN
Use this circuit to alert you when a fuse fails.... [Design Idea by Vladimir
Oleynik, Moscow, Russia] |
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Circuit Monitors Board, Air, and CPU Temperature to Protect System from
Overheating - App Note 941: Maxim IC (added 2/06) |
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Circuit offers series protection against power-line transients -
14-Oct-04 Issue of EDN Voltage transients on low-voltage power lines can
sometimes attain amplitudes many times the nominal voltage level. That behavior
often calls for protection against the application of improper power levels. The
usual way to protect sensitive circuitry against overvoltage is to add parallel
clamps. Fuses or other current-limiting devices precede these clamps' high
energy-absorption capability.... [Design Idea by Alfredo Saab and Travis
Eichhorn, Maxim Integrated Products, Sunnyvale, CA] |
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Circuit Prevents Deep Discharge of Batteries - 09/26/96 EDN-Design Ideas....To
avoid the deep discharge that can destroy or shorten the life of a rechargeable battery,
you must disconnect its load before the discharge is complete.... EDN is migrating links.
This link is not verified. Search the "title" + "EDN" for new link. |
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Circuit protects against ac-line disturbances - 07/02/98 EDN-Design Ideas 0
The circuit in Figure 1 protects the ac line against disturbances. It operates by
switching off the power supply upon detection of undervoltage or overvoltage
conditions. The circuit thus protects refrigerators, washing machines....PDF has several
circuits, please scroll to find this one.... [Design Idea byBASILIO SIMOES, ISA, COIMBRA,
PORTUGAL] |
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[GlobalSpec-AD/ad-smSQ-ihsGS.htm] |
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Circuit protects bus from 5V swings - 14-Nov-02 Issue of EDN The circuit
in Figure 1 automatically detects voltage and protects a bus, such as a 3.3V-limited PCI
bus, from 5V signal-level swings. You can also use the circuit to determine bus-voltage
swings within one bus-cycle for setting appropriate termination voltages of protection
diodes or termination resistors.... [Design Idea by Said Jackson, Equator Technologies
Inc, Campbell, CA] |
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Circuit Protects Computer's Input - 05/26/94 Issue of EDN-Design Ideas....The
circuit in Fig 1 performs input protection, level translation, isolation, and debouncing.
The circuit allowed the output of a relay driver to connect to a computer even though the
relay driver delivered a voltage as high as 24V and the relay driver had no ground
connection. With the values in Fig 1 the low and high thresholds at the circuit's....
[Design Idea by Ang Tzu Seng, Halliburton Drilling Systems, Singapore] |
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Circuit Protects FPGAs From killer Spikes - 04/23/98 EDN-Design Ideas....A
project using Xilinx FPGAs brought an interesting problem to light. When you turn on the
board, one FPGA in three succumbs to this problem. A lot of frustration and testing
uncovered a negative-going spike (Figure 1]in the 5V line from the dc/dc converter. The
system uses a dc/dc converter....File contains many circuits, scroll to find this one....
[Design Idea by Nelson Nguyen, Anritsu Corp, Morgan Hill, CA] |
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Circuit Protects from Battery Polarity Reversal - This simple circuit can
protect a sensitive electronic circuit from an accidental connection of a battery with a
reversed polarity. The N-channel FET connects the electronic device to the battery
only when the polarity is correct. The circuit shown was designed for a device
powered from a single 1.5 volts button cell battery. However, the circuit will
operate with higher voltages as well. …. [Designed by David A. Johnson] |
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