Although the regulation circuit is physically connected to the incoming mains, it is disconnected electrically. A monitoring circuit detects the portion of the sine wave that is charging the first of a pair of electrolytic capacitors. Once this first capacitor is fully charged, the diode bridge rectifier turns off and a mosfet switching circuit transfers the charge from the first cap to the second. This cycle is repeated continuously.
Output voltage: -0V - +22Vdc, 0V - -22Vdc
Output voltage: -0V - +22Vdc, 0V - -22Vdc
- Output current: +/- 0.5 amps dc
- Mains: 3 Pin IEC moulded (socket on rear)
- Mains Voltage: 230Vac
😊 What if I told you that this power supply is a commercial product designed to power a phono stage? Trichord Research Dino+ G2NC/HP
Last edited by a moderator:
That's some trick. I guess the physical connection must not be "metallic"...
Well, transfers some charge, based on the difference between in and out voltage values. We can assume the first cap is charged up to the peak of the 230Vac? Perhaps the basis of the electrical disconnection is it's simply not connected via the mosfet switch for very long; hence "virtually" disconnected.
Such a circuit would only be legal with a protective earth connection to the output ground I believe, but less than desirable in any situation I can think of.
The picture shows a transformer based power supply, with 2 22V secondaries, which is a galvanically isolated design and nothing to do with flying capacitors... Easier to see here: https://pinkfishmedia.net/forum/threads/trichord-dino-with-ncpsu.280749/
The picture shows a transformer based power supply, with 2 22V secondaries, which is a galvanically isolated design and nothing to do with flying capacitors... Easier to see here: https://pinkfishmedia.net/forum/threads/trichord-dino-with-ncpsu.280749/
so they (as almost always) told nonsense. why make a preamp (Dino) with an external toroidal amplifier and internally regulated, then a "traditional" dual power supply (Dino+) and then another one, this one (Dino++) declaring that it decouples from the mains by charging the capacitors... oh well!!
Last edited:
I don't understand this thing about super power supplies for phono preamps, I understand the use with amplifiers that have to supply current... but a preamp, a phono, a CD, maybe an external power supply for the turntable I can understand but only for a question of stability and regulation of the revolutions, or am I wrong? And yet they always talk about these power supplies that work "miracles".
Its all nonsense I think, 7815 and 7915 will work with any decent amp design fine. good amps have plenty of PSRR and once there's a few filter caps on the power rails they are as quiet as you want without anything complicated.
The specific problem with phono preamps is hum pickup - the input signals are so low that this is an issue, and its usually to do with grounding, not the PSU performance. Using batteries is one solution to hum (but there are other sources of hum than the preamp PSU anyway).