Recommedation for op amp for single supply applic?

leadbelly · 15th March 2004, 05:59 PM

Can anyone recommend a favorite op amp that will work with a single supply (+14VDC)? The application is for a car subwoofer LP filter and LR summer. Thanks.

peranders · 15th March 2004, 07:14 PM

Almost any modern opamp can be used at 14 VDC. Just check the datasheets for min supply voltage.

leadbelly · 15th March 2004, 07:38 PM

Are you saying put +14V at +Vcc and 0V at -Vee? I've always been told this is a no-no.

maylar · 15th March 2004, 09:01 PM

When using a single supply you need to bias the non-inverting input to a DC level, typically 1/2 the supply voltage, to give the opamp some "swing" to handle AC voltages. You also need to AC couple your signals so there's no DC component between stages.

You can do that with almost any opamp, but you'll be limited to how much AC signal you can handle because the common mode range is usually 2-3 volts from either supply rail. That means you can only get 6-8 volts pk-pk from a 12v supply. FET input amps are worse for this than bipolars.

Single-supply amps are designed to run closer to the rails. Linear Technology's LT1213 is pretty nice.

15th March 2004, 05:59 PM	#1
leadbelly diyAudio Member Join Date: Dec 2002 Location: Calgary, Alberta	Recommedation for op amp for single supply applic? Can anyone recommend a favorite op amp that will work with a single supply (+14VDC)? The application is for a car subwoofer LP filter and LR summer. Thanks. __________________ Aerodynamics are for people who can't build engines. Enzo Ferrari

15th March 2004, 07:14 PM	#2
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	Almost any modern opamp can be used at 14 VDC. Just check the datasheets for min supply voltage. __________________ /Per-Anders (my first name) or P-A as my friends call me

15th March 2004, 07:38 PM	#3
leadbelly diyAudio Member Join Date: Dec 2002 Location: Calgary, Alberta	Are you saying put +14V at +Vcc and 0V at -Vee? I've always been told this is a no-no. __________________ Aerodynamics are for people who can't build engines. Enzo Ferrari

15th March 2004, 09:01 PM	#4
maylar diyAudio Member Join Date: Jun 2003 Location: Connecticut	When using a single supply you need to bias the non-inverting input to a DC level, typically 1/2 the supply voltage, to give the opamp some "swing" to handle AC voltages. You also need to AC couple your signals so there's no DC component between stages. You can do that with almost any opamp, but you'll be limited to how much AC signal you can handle because the common mode range is usually 2-3 volts from either supply rail. That means you can only get 6-8 volts pk-pk from a 12v supply. FET input amps are worse for this than bipolars. Single-supply amps are designed to run closer to the rails. Linear Technology's LT1213 is pretty nice. __________________ dave

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