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AC-AC Adapters - why still so heavy and hard(er) to find?
MUFF WIGGLER Forum Index -> Music Tech DIY  
Author AC-AC Adapters - why still so heavy and hard(er) to find?
Navs
The PSU for my Boss SE-70 effects box has started to hum so I've been looking for a replacement.

I'm now used to replacing my older DC-output adapters with lighter, switching supplies (great for gigs and they generate less heat). Am I right in thinking that there is no equivalent for AC-AC supplies and, if so, why?

It's also surprisingly harder to source AC-AC adapters (I need 12VAC, 1500mA). Are we just living in a DC-world?

Thanks!
abelovesfun
I get my Jameco AC to AC adapters for my wallwart supplies from Amazon.
ersatzplanet
The easiest way to do AC-AC transformations are with step-down or step-up transformers. To handle decent current these typically have to be rather large and hence heavy.

And yes, we are living in a "DC world" as you say. Wall warts are DC mainly because then the burden or rectifying and filtering is left up to the wall wart maker and saves money for the wall wart user.
LED-man
That’s one reason:

https://ec.europa.eu/energy/en/topics/energy-efficiency/energy-efficie nt-products/external-power-supplies
Navs
Thank you - I'm wiser smile

Yes, LED-man, that's another reason I'm surprised that AC-AC is still old-school but James explains why.

Does anyone have any tips for sources in the EU/ Germany? This seems to be the sort of product that sorts out the consumer electronics shops from the 'serious' ones hihi The last place I bought one from, for a Haible Polymoog Resonator, doesn't have any now ...
the bad producer
There is this, Farnell any good for you?

http://uk.farnell.com/ideal-power/77db-10-15m/power-supply-ac-ac-11-5w -15v-0/dp/2368009?ost=2368009&iscrfnonsku=false&ddkey=http%3Aen-GB%2FE lement14_United_Kingdom%2Fsearch

Also the Yamaha PA-20 or 30.

That Farnell one has a UK plug built in, but I'm sure I got one from RS recently that had a 'foreign' plug hihi
the bad producer
Oh yeah, here's the Berlin version :

http://uk.rs-online.com/web/p/plug-in-power-supply/2813735/?searchTerm =281-3735&relevancy-data=636F3D3126696E3D4931384E525353746F636B4E756D6 26572266C753D656E266D6D3D6D61746368616C6C26706D3D5E285C647B362C377D5B4 161426250705D297C285C647B337D5B5C732D2F255C2E2C5D5C647B332C347D5B41614 26250705D3F292426706F3D3126736E3D592673743D52535F53544F434B5F4E554D424 5522677633D4E4F4E45267573743D3238312D33373335267374613D323831333733352 6
macsimski
Whats the voltage and cutrrent of the output? Ive hd great results in taking a ac-dc version apart and just take out the diodes and caps. sealed ones you can open by carefully cracking them with a vise.

[edit] Ah 15volt. the same as the small behringer 6ch mixer i have.
the bad producer
Whoops, linked 15VAC, here's the 12VAC one:

http://uk.rs-online.com/web/p/plug-in-power-supply/4006541/
the bad producer
Ooh! applause

macsimski wrote:
Whats the voltage and cutrrent of the output? Ive hd great results in taking a ac-dc version apart and just take out the diodes and caps. sealed ones you can open by carefully cracking them with a vise.
macsimski
yeah, but 15 volt is a little high. most of them are 12v at the most at decent amperages.

but maybe the humming can be fixed by applying some glue to the coils and the kernel.
latigid on
My sources of transformer adaptors in the past few years have been flea markets and second hand shops! I noticed a year or so ago that Reichelt sell only SPSUs.

Any serious musician has a master power switch to not leave the trafos connected to the mains when not in use... or leave them plugged in in winter to reduce the heating bill hihi
Navs
Thanks, Bad Producer! I'm not finding the specs I need (Farnell, RS, Mouser, TME, Ali Express) but I'll keep looking. Closest I got was this:

https://www.amazon.de/Wechselspannungsnetzteil-12V-1000mA-AC-Netzteil- Steckertrafo/dp/B001IRMAWA

But it only delivers 1000mA, Boss says 1500mA.

macsimski wrote:
yeah, but 15 volt is a little high. most of them are 12v at the most at decent amperages.

but maybe the humming can be fixed by applying some glue to the coils and the kernel.


Now that's what I'd like to know - are these things repairable? The original Boss, BRB-220, is unscrewable.
macsimski
thats the trick with the vise. just squeeze the upper or lower part and experiment with a lees precious one or two. some damage inevitable but most of the time some glue will hold the two pieces together just fine. just dont use too much glue as you may need to open her up again. :-)
duff
I have a few of these 2A 12V adapters from eBay, they seem to work ok for me.
http://www.ebay.co.uk/itm/2A-2000MA-12V-24VA-AC-AC-OUTPUT-MAINS-POWER- ADAPTOR-SUPPLY-CHARGER-TRANSFORMER/121983405815?ssPageName=STRK%3AMEBI DX%3AIT&_trksid=p2055119.m1438.l2649
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