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Cheap linear 230v - 9v VS Step down transformer
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Topic: Cheap linear 230v - 9v VS Step down transformer (Read 1854 times)
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Paulo83
Newbie
Posts: 9
Cheap linear 230v - 9v VS Step down transformer
«
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.
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Paul Cawley
Paul Birkeland
Global Moderator
Hero Member
Posts: 18138
Re: Cheap linear 230v - 9v VS Step down transformer
«
Reply #1 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
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Paul "PB" Birkeland
Bottlehead Grunt & The Repro Man
Paulo83
Newbie
Posts: 9
Re: Cheap linear 230v - 9v VS Step down transformer
«
Reply #2 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?
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Paul Cawley
Paul Birkeland
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Hero Member
Posts: 18138
Re: Cheap linear 230v - 9v VS Step down transformer
«
Reply #3 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!
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Paul "PB" Birkeland
Bottlehead Grunt & The Repro Man
mcandmar
Hero Member
Posts: 1598
Not all engineers are civil
Re: Cheap linear 230v - 9v VS Step down transformer
«
Reply #4 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.
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M.McCandless
Paulo83
Newbie
Posts: 9
Re: Cheap linear 230v - 9v VS Step down transformer
«
Reply #5 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!
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Paul Cawley
mcandmar
Hero Member
Posts: 1598
Not all engineers are civil
Re: Cheap linear 230v - 9v VS Step down transformer
«
Reply #6 on:
August 20, 2018, 11:03:52 PM »
Decent looking bit of kit, should do the job nicely.
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M.McCandless
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Cheap linear 230v - 9v VS Step down transformer