Electronics > Beginners
12v DC to 12V AC
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ArthurDent:
It sounds like you already have the 12VDC power supplies for the rest of the system so all you need is the transformer that is rated 12VAC / 1A.  They make ones that plug into a wall outlet just like a D.C. power adapter. Check where you bought the amp, they must sell suitable transformers as well.
.....:
thanks for all of the replies i have decided that i am going to buy a 12vac psu that plugs into the mains and just use it for the preamps

jack
Zero999:

--- Quote from: Ian.M on August 19, 2018, 08:46:54 pm ---It will probably *work* off a squarewave but you are likely to get excessive noise breakthrough of the switching frequency and its odd harmonics as most valve amps don't have great PSRR.

--- End quote ---
Yes that's a possibility. It can be mitigated somewhat by keeping the rise/fall times reasonably slow, at the cost of efficiency, but I agree, it's a risk.


--- Quote from: ..... on August 19, 2018, 09:05:05 pm ---thanks for all of the replies i have decided that i am going to buy a 12vac psu that plugs into the mains and just use it for the preamps

jack

--- End quote ---
Yes, all you need is a transformer with a 12V output: it's certainly simpler and better than building a 12VDC to 12VAC inverter.
Audioguru:
The no name-brand antique preamp (old vacuum tubes?) has no audio spec's.
Its ebay ad says, "It will bring you an unexpected surprise!" Hiss, hum and distortion?
james_s:
Why do you have all these separate power supplies? You only need one, just a single 12VAC power supply and then a rectifier and regulator for each DC output you want. There is no advantage to having multiple separate supplies, that's just pointless.
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