Hi.
I'm busy building some opamp circuits, and it occurred to me that most of the circuits/ schematics I see, run the opamps from dual +/-15V supplies.
I have dual +/-12V for this project. Will it degrade the performance in any way?
I'm using JRC4558 IC's.
I know that headroom will be diminished somewhat, but my project will be for line level signals only.
I'm busy building some opamp circuits, and it occurred to me that most of the circuits/ schematics I see, run the opamps from dual +/-15V supplies.
I have dual +/-12V for this project. Will it degrade the performance in any way?
I'm using JRC4558 IC's.
I know that headroom will be diminished somewhat, but my project will be for line level signals only.
Using -+12V will be good for 4558.
This 5% difference in sound will not be noticeable on this dark sounded opamp. On hi-res systems with other opamp dynamic resolution can be little higher.
This 5% difference in sound will not be noticeable on this dark sounded opamp. On hi-res systems with other opamp dynamic resolution can be little higher.
Other than reduced headroom, as you say, there is no real reason to be concerned about using +/- 12V supplies. Whether headroom is an issue depends on your application. The JRC4558 specification quotes an absolute maximum supply of +/- 22V.
This is an analog line level forum topic but plenty of line level, often portable audio gear, runs with 12V supplies. As long as there are no other circuits in there that must have 15V supplies, there should be few problems with pedestrian opamps like 4558s.
15v and higher rails can show better linearity but that's not likely to be a concern if you are specifying these parts.
15v and higher rails can show better linearity but that's not likely to be a concern if you are specifying these parts.
analog signal level "line outputs" in pro audio equipment often spec +20 dB over the +4 dBu "0 dB" which then requires ~17 Vpk, ~30 mA into the (mostly hypothetical) 600 Ohm standard load
only a relatively few monolithic op amps can manage
only a relatively few monolithic op amps can manage
Tradition, it's been around for a long time. +-15V gives lots of room to do 10V out all the time before rail to rail outputs, better transistors, better designs, etc.
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