is it possible to use single supply for opamp - Electronic Circuits Projects Diagrams Free

saran · 10th May 2007, 06:05 AM

is it possible to use single supply for opamp i.e.. 12v alone .
My appication is to measure current , so that the output of CT is connected to my preciion rectifier , i am using 4558 opamp and +12v and -12v for supply pins. Is it possible to use only +12v, my output range should be within 5v for the range of 20 amps . So if 20 amps flows means , the output should be 5v.and if 10 amps means 2.5v should be the output , i am getiing the required output while using dual supply but while trying in single supply , i am not getting it , can anyone help me

mneary · 10th May 2007, 06:33 AM

The application notes are rich with examples on how to use the 4558 with a single supply (also look at application notes for 741 and LM124 and LM324).

A key concept to learn is "common mode range".

TheVictim · 10th May 2007, 06:49 AM

Split the supply voltage in half with a voltage divider and connect the division point to the non-inverting output. A 100uF cap from the division point to ground will keep power supply noise out.

aussiepoof · 10th May 2007, 08:13 AM

...or use a "chopper stabilized" op-amp like the MC34071... and I believe the TL272 handles single supply easily too (though not tried it.) I'm using the MC34071 successfully in a circuit requiring 0-15v swing without the neg power supply.

P.

ericgibbs · 10th May 2007, 08:55 AM

hi saran,
Can you post a sketch of the way you have connected the dual and single supply versions of your circuit.

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10th May 2007, 06:05 AM	(permalink)
saran	is it possible to use single supply for opamp is it possible to use single supply for opamp i.e.. 12v alone . My appication is to measure current , so that the output of CT is connected to my preciion rectifier , i am using 4558 opamp and +12v and -12v for supply pins. Is it possible to use only +12v, my output range should be within 5v for the range of 20 amps . So if 20 amps flows means , the output should be 5v.and if 10 amps means 2.5v should be the output , i am getiing the required output while using dual supply but while trying in single supply , i am not getting it , can anyone help me

10th May 2007, 06:33 AM	(permalink)
mneary	The application notes are rich with examples on how to use the 4558 with a single supply (also look at application notes for 741 and LM124 and LM324). A key concept to learn is "common mode range".

10th May 2007, 06:49 AM	(permalink)
TheVictim	Split the supply voltage in half with a voltage divider and connect the division point to the non-inverting output. A 100uF cap from the division point to ground will keep power supply noise out.

10th May 2007, 08:13 AM	(permalink)
aussiepoof	...or use a "chopper stabilized" op-amp like the MC34071... and I believe the TL272 handles single supply easily too (though not tried it.) I'm using the MC34071 successfully in a circuit requiring 0-15v swing without the neg power supply. P.

10th May 2007, 08:55 AM	(permalink)
ericgibbs	hi saran, Can you post a sketch of the way you have connected the dual and single supply versions of your circuit. __________________ Eric "Good enough is Perfect" PIC tutorials: Gramo's: www.digital-diy.net/ Bill's: www.blueroomelectronics.com/