Regulated PSU??

[MikeFarad]

Hello,
This might be a somewhat abstract question, but, do you think it would be worthwhile to use a regulated supply for a simple buffer- hp filter? (Using an OPA2134 or LM4562)

[Keruskerfuerst]

The power supply rejection of an audio circuit should be >100dB.
It is nessecary to use an regulated power supply.

[Gordy]

"An amplifier receives a wave of electrons at it's input and produces a facsimile of that wave at it's output by modulating it's power supply according to it's transfer characteristic" (© Gordy, 2007)

So, yes, use a regulated supply.
Ideally use a supply with a low and constant output impedance over the audio band.
Read-up on pcb routing.
Use by-passing capacitors close to the chip power pins.
Remember that ground is also signal return (in conventional terms).
Remember that ground is also electron distribution (in unconventional terms).

[richie00boy]

To be honest it depends on the application and quality desired. A simple zener shunt reg might well be fine. In fact I've run simple op-amp circuits unregulated before without any real problems. 470uF per op-amp seemed fine.

[Gordy]

Originally posted by richie00boy
...quality desired.

If you want the best possible design, then regulate. It's not overly-expensive, and the information and parts are available. Unregulated is a compromise. It's as simple as that.