Power supply

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lejonklou
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Re: Power supply

Post by lejonklou »

tokenbrit wrote: 2020-08-06 18:43 Can the single input switch on the Sagatun Mono help at all with regard to the ground via the Gigaport's RCA outputs? If a phono stage is plugged in to the single source input, and the preamps switched to single source only, does that break the loop from a Hakai plugged in to IN1-4? At least when listening to LPs...
Hi tokenbrit!

Sorry, it makes no difference as the grounds are all connected. The Single Source input and IN1-4 all share the same ground.
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Re: Power supply

Post by David Neel »

It would be nice to find a cheap and musical class II power supply to replace the Nano 160. Failing that, does anyone know whether the Streacom ZF240 is class II? It is not cheap, nor are the Streacom cases into which it fits. But in the context of my system, it's not completely unaffordable and would eliminate the black brick on the floor.
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Re: Power supply

Post by FairPlayMotty »

David Neel wrote: 2020-09-09 19:01 It would be nice to find a cheap and musical class II power supply to replace the Nano 160. Failing that, does anyone know whether the Streacom ZF240 is class II? It is not cheap, nor are the Streacom cases into which it fits. But in the context of my system, it's not completely unaffordable and would eliminate the black brick on the floor.
There are plenty of candidates around. Although the one in the attached link has a four pin connector, barrel adapters are around £3.

https://www.sunpower-uk.com/product/160 ... er-supply/
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Re: Power supply

Post by David Neel »

Thank you - under investigation.
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Re: Power supply

Post by FairPlayMotty »

There are others David. I'm searching as I listen.

https://www.enrgtech.co.uk/buy/product/ ... 50012B-12A

I'll chase my brother tomorrow, he heads up a large hospital laboratory amongst other things like buying the electronics - he may well have a discount with vendors. And he's a nerd so he'll know more candidates.
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Re: Power supply

Post by FairPlayMotty »

The Mean Well GSM160B series has a likely option. There's one in the U.S. eBay for £15.
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Re: Power supply

Post by lejonklou »

Update: I have tested the RGeek 200W adapter, model number is LD120180 (meaning of model number is likely 12 Volts and 18 Ampere, which is the rating).

It gives a high pitched noise through the speakers, regardless of whether the power cord is grounded or not. Not sure if it's a faulty specimen or a bad product.

Still have the Z2-ATX-200 plug-in board to test.
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Re: Power supply

Post by FairPlayMotty »

lejonklou wrote: 2020-09-11 14:24 Update: I have tested the RGeek 200W adapter, model number is LD120180 (meaning of model number is likely 12 Volts and 18 Ampere, which is the rating).

It gives a high pitched noise through the speakers, regardless of whether the power cord is grounded or not. Not sure if it's a faulty specimen or a bad product.

Still have the Z2-ATX-200 plug-in board to test.
I don't have that issue - perhaps you got a faulty one Fredrik.
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Re: Power supply

Post by David Neel »

David Neel wrote: 2020-09-09 19:01 does anyone know whether the Streacom ZF240 is class II?
I now have an answer from Streacom tech support: the ZF240 also ties the output ground to the mains ground, so it will have the same issue as the Nano PSUs.
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Re: Power supply

Post by FairPlayMotty »

David Neel wrote: 2020-09-14 10:15
David Neel wrote: 2020-09-09 19:01 does anyone know whether the Streacom ZF240 is class II?
I now have an answer from Streacom tech support: the ZF240 also ties the output ground to the mains ground, so it will have the same issue as the Nano PSUs.
I had a chat with tech support at QuietPC - their guy is going to pass on to Streacom that they might want to offer a class II option. And QuietPC now know there's a market opportunity.
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Re: Power supply

Post by lejonklou »

FairPlayMotty wrote: 2020-09-11 16:27
lejonklou wrote: 2020-09-11 14:24 Update: I have tested the RGeek 200W adapter, model number is LD120180 (meaning of model number is likely 12 Volts and 18 Ampere, which is the rating).

It gives a high pitched noise through the speakers, regardless of whether the power cord is grounded or not. Not sure if it's a faulty specimen or a bad product.

Still have the Z2-ATX-200 plug-in board to test.
I don't have that issue - perhaps you got a faulty one Fredrik.
I have been in contact with RGeek and they were completely unwilling to help me with my apparently faulty 200W adapter.

Avoid RGeek!
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Re: Power supply

Post by springwood64 »

I am comparing the following AC to DC power supplies:

For Hakai
  • RGeek 120W (12v 10A) adapter
  • Friwo DT50M (12v 3.8A) adapter
For Tinkerboard S
  • Raspberry Pi 4 (5v 3A) USB
  • Allo Nirvana (5v 2.8A) USB
I'll post recordings once the burn in is complete, after a couple of weeks
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Re: Power supply

Post by springwood64 »

I realise I completely forgot to post recordings

In the meantime I have paused my Tinkerboard project and sold the Allo power supply, and I no longer have the recordings.

I'll just have to summarise my findings

Hakai
The Friwo sounds very poor compared to the Rgeek: dull and lifeless

Tinkerboard
Wow! The Allo Nirvana is strikingly better than the RPi power supply. However, the combination is still a long way behind the Hakai, so I've dropped the project for the time being.
Pete

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