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Old 12th July 2007, 06:52 PM   #1
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Default Regulated PSU??

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)
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Old 12th July 2007, 07:19 PM   #2
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The power supply rejection of an audio circuit should be >100dB.
It is nessecary to use an regulated power supply.
Houston, we have a problem!
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Old 12th July 2007, 11:23 PM   #3
Gordy is offline Gordy  United Kingdom
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"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).
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Old 12th July 2007, 11:30 PM   #4
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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.
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Old 12th July 2007, 11:41 PM   #5
Gordy is offline Gordy  United Kingdom
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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.
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