Safety / Protection Circuits, Page 1
Safety /
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Last Updated on:
Thursday, April 19, 2012 06:10 AM |
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Circuits Designed by Dave Johnson, P.E. : |
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12v Battery Load Cutout Circuit
Lead-acid batteries should not be discharged below a certain point if they are to
last. Also, you don’t want certain 12v powered devices, which might be plugged
into a car’s cigarette lighter outlet, to drain the car battery down to a point
where the car’s engine will not start. To prevent battery damage or a dead
battery, the circuit below disconnects a load from the battery when the voltage dips
below a fixed but adjustable voltage and will not reconnect the load until a reset
button is pressed.....
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Links to electronic circuits,
electronic schematics, designs for engineers, hobbyists, students & inventors:
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±500 Volt Protection Circuit - Supertex Semiconductors (app
note added 2/06) |
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12 Volt Battery Charge Monitor - Here is a battery monitor circuit
which disconnects the load when the battery is discharged, preventing a a
deep discharge which could cause permanent battery damage. The battery is
automatically reconnected when a battery charger or other DC
source....(electronic schematic / circuit added 4/02) |
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12 volt battery monitor - R1 controls the trip-point of the
circuit. when the voltage falls below the trip-point, the led lights. adjust
it to the desired level. to use this circuit to monitor a 6v battery,
substitute D1 for a 3.3 volt zener diode and adjust R1 accordingly.
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12v Battery Load Cutout Circuit - Lead-acid batteries should not
be discharged below a certain point if they are to last. Also, you
don’t want certain 12v powered devices, which might be plugged into a car’s
cigarette lighter outlet, to drain the car battery down to a point where the
car’s engine... [Designed by David A. Johnson] |
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5V to 3.3V Regulator with Fail-Safe Switchover - DN82 Design
Notes (Linear Technology) (app note added 6/06) |
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AB-17/ Adding an Over-Voltage Crowbar to an RC5051 Converter: Design & Analysis -
Fairchild Application Notes / (app note added 6/06) |
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Accurate Power Supply Sequencing Prevents System Damage - DN384 Design
Notes (Linear Technology) (app note added 1/06) |
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Add fault protection to a 4- to 20-mA loop supply - 22-Jan-04 Issue of EDN
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.... [Design Idea by Mark Pearson, Maxim Integrated Products, Sunnyvale, CA] |
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Adding an Over-Voltage Crowbar to an RC5051 Converter: Design & Analysis/ AB-17 -
Fairchild Application Notes / (app note added 6/06) |
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Adding Thermal Protection to the DS2784 Stand-Alone Fuel Gauge - Maxim App
Note 4192 -- 3/26/2008 -- (app note add 5/08) |
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Additional RFI Protection for Line Input Circuits - AS072 Jenson Transformer
Application Note (app note 5/02) |
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Addressing the Physical Security of Encryption Keys - Maxim App Note 4185
-- 2/21/2008 -- (app note add 5/08) |
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Advanced Polarity Protection with MOSFETs - Advanced Power Switching and
Polarity Protection for Effects (added 5/02) |
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Amplifier Thermal Protection - (electronic schematic / circuit added 4/02)
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