Bottlehead Forum
General Category => General Discussion => Topic started by: 4krow on September 24, 2016, 09:51:19 AM
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Obviously there are a number designs out there for power supplies for audio equipment. They range roughly from switch mode supplies to battery supplies. The supply that I would have question about is a regulated power supply where the voltage for each rail can be fine tuned. Of course these tend to take a more expensive path, but what circuits besides just tubes circuits might benefit from them?
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I have one of those, they're great! Never thought to use it in audio though.
In my experience, the difference between just USB power and a high quality linear PSU (which outperforms most batteries) on a DAC can be described as "I think I hear something" ;)
For amps on the other hand, both solid state and tube, PSU upgrades matter. Built a 30V AMB s11 linear PSU for AMB M3 and it really made a big difference in noise floor and transients.
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There are a few main advantages to regulated supplies,
- Lower noise floor and power supply noise rejection. I.e. better isolates the circuit from any noise or ripple on the main DC supply.
- Regulated voltage, keeps biasing points consistent as the DC voltages won't fluctuate with mains voltage, especially important for digital circuity.
- Output impedance, most regulated supplies present a lower impedance to the load which can help frequency response.
As above i mock up all my circuits with bench supplies, my Heathkit 2717 is especially good for tube circuits as it can generate a regulated 400dc, and provides 6v and 12v outputs to drive the filaments. It could also be shocking dangerous if you are not careful, pun intended!
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Thanks for the responses, they are helpful.