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Old 14th January 2013, 08:40 AM   #1
Mordor is offline Mordor  Italy
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Lightbulb voltage gate circuit... help!

Hi, for a project i need to make a protection circuit.
Input can be from 1 to 65 70 volt.
Output must be on from 20.5 to 56.5 ( with mosfet always in saturation or closed, not in half state) taking out lower voltages and higher voltages... a voltage band pass gate with 1 ampere max.
I played with mosfet and zener, the way is right.
Some idea about a simple des for it ? thank!

Last edited by Mordor; 14th January 2013 at 09:30 AM.
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Old 14th January 2013, 10:53 AM   #2
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Use a window comparator. Attenuate the voltage to the required levels if u use the IC comparator/opamp in the circuit.

Gajanan Phadte
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Old 14th January 2013, 02:03 PM   #3
Mordor is offline Mordor  Italy
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i was trying to use resistors zeners and mosfet in order to make this in a simple and discrete way ... opamp? so u mean use a normal op amp with zener resistor for supply, and partitor for compare values ?
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Old 14th January 2013, 02:15 PM   #4
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LTC4366 not exactly what you need. You might be able to build something around it.
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Old 15th January 2013, 01:34 AM   #5
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Being a PIC man I always use a small PIC to monitor the output voltage for DC.
If DC is detected for 500mS the PIC turns off the output relay.
The same PIC also has a 3 second power up delay before turning on the relay.
It can be done with an 8 pin PIC very easily.
Murton-Pike Systems PCBCAD51 pcb design software. http://www.murtonpikesystems.co.uk
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Old 15th January 2013, 02:07 AM   #6
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I think this is what are you looking. Check this link:Voltage Comparator Switch
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Old 15th January 2013, 04:31 AM   #7
gootee is offline gootee  United States
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Maybe some of the circuits used to protect against automotive load dump would work for you. Try google.
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