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August 24, 2019, 04:47:51 AM

Author Topic: 230v psu  (Read 1563 times)

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Offline Strikkflypilot

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230v psu
« on: March 03, 2016, 08:47:20 AM »
Hi!
Anyone have a good advice regarding a good 230v to 9v psu for the Bottlehead DAC?
Home system:
Sources: Ibasso DX90, Google Chromecast Audio optical out
DAC: Schiit Gumby
Amp: Bottlehead Mainline
http://bottlehead.com/smf/index.php?topic=7463.0
Phones: HD800S

Office:
Sources: Iphone/ Ipod
DAC: Dragonfly Red+Jtrbug
Amp: Crack/Speedball heavily modded
Phones: HD580,HD600 grilles

Offline mcandmar

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Re: 230v psu
« Reply #1 on: March 04, 2016, 04:06:52 AM »
Disclaimer first, use of anything other than what BH supplies isn't supported, and if you fry something that is certainly not going to be covered under warranty.  I don't even know if BH have a stock of spare boards so you run the risk of turning it into an expensive paperweight.

That said you need something in the 6-9volt range that can supply a constant 500ma.  Somebody posted recently about a 9v supply they bought, but it wasn't cheap.
M.McCandless

Offline Strikkflypilot

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Re: 230v psu
« Reply #2 on: March 04, 2016, 06:02:50 AM »
Thanks for the disclaimer.
I saw the Teddy9/2 PSU, costs more than a Crack, though.
It is necessary to know the dimensions of the 9v plug, though.
Home system:
Sources: Ibasso DX90, Google Chromecast Audio optical out
DAC: Schiit Gumby
Amp: Bottlehead Mainline
http://bottlehead.com/smf/index.php?topic=7463.0
Phones: HD800S

Office:
Sources: Iphone/ Ipod
DAC: Dragonfly Red+Jtrbug
Amp: Crack/Speedball heavily modded
Phones: HD580,HD600 grilles

Offline mcandmar

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Re: 230v psu
« Reply #3 on: March 04, 2016, 06:37:26 AM »
True. I am sure there are other supplies out there for reasonable money.

Socket is a regular barrel connector, 5.5mm outer, 2.1mm inner, center positive.
M.McCandless

Offline Strikkflypilot

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Re: 230v psu
« Reply #4 on: March 04, 2016, 07:09:41 AM »
Thanks.
Anyone thinks I would risk too much with this, please chime in:)
Home system:
Sources: Ibasso DX90, Google Chromecast Audio optical out
DAC: Schiit Gumby
Amp: Bottlehead Mainline
http://bottlehead.com/smf/index.php?topic=7463.0
Phones: HD800S

Office:
Sources: Iphone/ Ipod
DAC: Dragonfly Red+Jtrbug
Amp: Crack/Speedball heavily modded
Phones: HD580,HD600 grilles

Offline ToolGuyFred

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Re: 230v psu
« Reply #5 on: June 13, 2016, 02:18:33 AM »
You could try what I did and run from 8 AA alkaline cells. They get hot and only last a few hours but convinced me batteries were the way to go.

The 230 to 110V adaptor which came with my DAC kept tripping out so I bought a bigger unit from Maplin electronics. When the BottleBat came out, I was tempted but this would have meant a 4-box solution for a DAC!

I built a PSU based on Yuasa emergency lighting cells (8 off 4AH D-cell NiCad). These have a low internal resistance and unlike lead acid types can be run completely flat without harm. I get 8 hours listening per charge and have the cells breadboarded with their own periodic current reversal charger. (Charging NiCads the usual way from a constant current source isn't recommended but I have cells 20 years old and as good as new which have  only been subjected to PCR.) Recharging takes 16 hours. A relay on the charge circuit disconnects the output while charging. I now have no means of running the DAC from the mains but you soon get used to flipping into charge mode when not listening.

If you go for mains power then I'd suggest building your own 9v unit with shunt regulation as I haven't found anything out there HiFi enough for the job...

John
Amateur Audiophile and Backstreet Boffin.
Original Foreplay with C4S + Sweet Whispers
ParaSEX amps with MQ nickel-cored outputs
Factory-built Lowther Acousta 115s with silver-coiled DX3s, wired in DNM solid-core
KEF active sub (help for the last couple of octaves).
Bottlehead DAC on batteries.

Offline Bacci

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Re: 230v psu
« Reply #6 on: August 21, 2016, 09:22:08 PM »
I would just build a high quality linear power supply, like this one for example http://www.amb.org/audio/sigma11/.
Should also be an upgrade in theory, although the filtering in Bottlehead's DAC is already so good you'd probably not be able to A/B it   :D