Yamaha PA-20
This is a linelump supply and features a fixed 17.5-0-17.5 volt AC output at 0.94A maximum.
This means it gives us two AC outputs with a centre tap or mid point reference voltage. So
unlike the single phase AC adapter output with two leads, this one has three. This means you
need to use the Oakley RPSU in full wave rectification mode.
The PA-20 is made for Yamaha products and they are available from Yamaha spares
departments as well as many music shops, eg. Thomann. These are CE approved and connect
to the mains via your local mains connector. They will be different types depending on the
country you need them for. It comes with a handy three way plug at the low voltage end that
you can use with an appropriate socket. If you wish you can ditch their connector and use
your own. Maplin in the UK sell a suitable three way connector to fit the Yamaha one
perfectly. Their part number is FM51F.
In the UK the line lump’s part number is V9812300 and the total cost is around £35 including
VAT and postage. If you are buying these direct from Yamaha and, for some reason, are
asked why, the probably best thing is to say it is for a MG12/4 mixer.
Once rectified, smoothed and regulated the Yamaha PA-20 can deliver up to 0.52A
continuously into both 15V rails.
You should fit both fuses and both should be anti-surge types and rated between 1A and 1.6A.
The European version of the PA-20. Other country's units are similar but will have the local mains
connector fitted.
If you have successfully used the Oakley PSU with any other types of power pack please do
let the community know via the Oakley Sound forum at www.muffwiggler.com
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