Bottlehead Forum

Bottlehead Finished Products => Legacy Products => Bottlehead DAC => Topic started by: Paulo83 on August 14, 2018, 12:06:23 PM

Title: Cheap linear 230v - 9v VS Step down transformer
Post by: Paulo83 on August 14, 2018, 12:06:23 PM

Hey all,

I have recently snapped up a used Bottlehead DAC and wanted to sound you all out on the best way to go in terms of power supply when it turns up (shipping from US to UK).

I believe it will turn up with the original 110v psu but wondered what the trade off would be between picking up a cheapish 230 - 110 step down transformer vs a cheap 230v - 9v DC linear supply like this https://uk.rs-online.com/web/p/desktop-power-supply/4006945/

While I have read a bit about the battery PSUs that were released I haven't been able to track any down for sale.

I'm not afraid of a little DIY if there are significant gains to be had elsewhere but ideally I don't want to spend much more money to get the DAC up and running.

Title: Re: Cheap linear 230v - 9v VS Step down transformer
Post by: Paul Birkeland on August 14, 2018, 01:13:08 PM

The power supply you linked to is not rated for sufficient current to power the DAC.

The cheap-ish 230-110 transformer is a good idea.  10VA would be plenty, but you'll probably end up not finding much under 50VA.

-PB

Title: Re: Cheap linear 230v - 9v VS Step down transformer
Post by: Paulo83 on August 17, 2018, 12:40:30 PM

Thanks for getting back to me. So would something like this be more suitable? https://www.amazon.co.uk/Stepdown-voltage-converter-version-240V/dp/B000H9HU5C/ref=mp_s_a_1_2?ie=UTF8&qid=1534545272&sr=8-2&pi=AC_SX236_SY340_FMwebp_QL65&keywords=230v+to+110v+transformer&dpPl=1&dpID=41ULDTS0rPL&ref=plSrch

Seems concerningly cheap! I assume it being rated to 45w isn't an issue, will the DAC just draw what it needs?

Title: Re: Cheap linear 230v - 9v VS Step down transformer
Post by: Paul Birkeland on August 17, 2018, 04:40:01 PM

The 45W rating is more than adequate for the DAC, but your suspicions about quality are well founded, I'd look for the 100W model!

Title: Re: Cheap linear 230v - 9v VS Step down transformer
Post by: mcandmar on August 17, 2018, 11:43:40 PM

Go big, i tried the 50w converters and they used to overheat and trip the thermal protection after a few hours.  Go for a 75w or 100w.

Title: Re: Cheap linear 230v - 9v VS Step down transformer
Post by: Paulo83 on August 20, 2018, 05:55:52 PM

I went for this in the end.
https://www.amazon.co.uk/gp/aw/d/B07BG98F4K/ref=ox_sc_act_image_1_1_1?smid=A11IPLSR49VH0N&psc=1

Hopefully will do the job!

Title: Re: Cheap linear 230v - 9v VS Step down transformer
Post by: mcandmar on August 20, 2018, 11:03:52 PM

Decent looking bit of kit, should do the job nicely.